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meetinglist.yml
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- name: "CaaS Monthly Meeting"
date: 2024-12-12 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/91526749339?pwd=52MET9OQwUqI9nGgk3ko3XmTASQPuN.1)"
label: caas_12Dec2024
agenda:
- title: "2024 Compiler-Research Project Overview"
speaker:
image: "https://compiler-research.org/images/team/Vassilev.jpg"
name: "Vassil Vassilev"
description: |
2024 was a busy year for our compiler research team. We have made
substantial progress in automatic differentiation with Clad. We enabled
large physics workflows and observed substantial performance gains in
minimization of likelihoods. We also progressed in advancing foundational
tools such as ClangRepl, BioDynaMo, Jupyter, LLVM and ROOT.
This talk provides a brief overview of what our team has done in 2024.
slides: "/assets/presentations/CaaS_12_12_2024.pdf"
- title: Update
speaker: Vassil Vassilev
- title: Next meeting
speaker: Vassil Vassilev
link: 06 Feb 1700
- name: "CaaS Monthly Meeting"
date: 2024-11-07 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/91526749339?pwd=52MET9OQwUqI9nGgk3ko3XmTASQPuN.1)"
label: caas_07Nov2024
agenda:
- title: "CppInterOp: Advancing Interactive C++ for High Energy Physics"
speaker:
image: "https://compiler-research.org/images/team/Aaron.jpg"
name: "Aaron Jomy"
bio: |
Aaron Jomy is currently an intern at CERN, working with the ROOT team
on developing language interoperability software based on technologies
in Clang/LLVM. Previously, he earned his bachelor's in technology in
Computer Science from Manipal Institute of Technology in India and
worked as a research intern in the compiler research group at
Princeton University (US).
description: |
The Cling C++ interpreter has transformed language bindings by enabling
incremental compilation at runtime. This allows Python to interact with
C++ on demand and lazily construct bindings between the two. The
emergence of Clang-REPL as a potential alternative to Cling within the
LLVM compiler framework highlights the need for a unified framework for
interactive C++ technologies. This talk presents CppInterOp, a C++
Interoperability library, which leverages Cling and LLVM's Clang-REPL,
to provide a minimalist and backward-compatible API facilitating
seamless language interoperability. This provides downstream interactive
C++ tools with the compiler as a service by embedding Clang and LLVM as
libraries in their codebases. By enabling dynamic Python interactions
with static C++ codebases, CppInterOp enhances computational efficiency
and rapid development in high-energy physics. The library offers
primitives enabling cppyy(PyROOT), an automatic, run-time, Python-C++
bindings generator. We showcase how CppInterOp optimizes cross-language
execution and computational tasks in high-energy physics, making it a
valuable tool for researchers and developers.
slides: "/assets/presentations/Aaron_J-CaaS_CppInterOp.pdf"
- title: Update
speaker: Vassil Vassilev
- title: Next meeting
speaker: Vassil Vassilev
link: 12 Dec 1700
- name: "CaaS Monthly Meeting"
date: 2024-09-05 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/94396923932?pwd=9MDrbK3nQgGYjqkEZILGO7ne4YczA9.1)"
label: caas_05Sep2024
agenda:
- title: Update
speaker: Vassil Vassilev
slides: "/assets/presentations/CR_05_09_2024.pdf"
- title: Next meeting
speaker: Vassil Vassilev
link: 7 Nov 1700
- name: "CaaS Monthly Meeting"
date: 2024-07-11 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/94396923932?pwd=9MDrbK3nQgGYjqkEZILGO7ne4YczA9.1)"
label: caas_11Jul2024
agenda:
- title: "Automatic Differentiation in Roofit for Fast and Accurate Likelihood Fits"
speaker:
image: "https://compiler-research.org/images/team/Vaibhav.jpg"
name: "Vaibhav Thakkar"
bio: |
Vaibhav Thakkar is currently a research Intern at CERN, working with
the compiler research group at Princeton University (US) on the
project of compile-time automatic differentiation (Clad) in C++ for
scientific computing applications. Previously, he earned my bachelor's
in technology in Electrical Engineering from IIT Kanpur in India and
worked as a software engineer for a couple of years after graduation.
description: |
RooFit is a widely used data analysis library in High-energy physics
experiments at CERN, which requires minimizing likelihoods with
thousands of free parameters spread over hundreds of likelihood
components. To iteratively find the minimum of a likelihood, one
generally has to know the gradient of the likelihood with respect to all
free parameters. Previously, these were calculated using numerical
differentiation, which requires varying one parameter at a time and
reevaluating the full likelihood. Although complete reevaluation can be
prevented by a caching mechanism, it incurs a significant overhead in
bookkeeping. This talk discusses the recent integration of automatic
differentiation (AD) in RooFit for these gradient computations using
Clad, a compile-time AD library for C++ codebases. We also present the
efficiency improvements with the recently released Atlas and CMS Higgs
models.
slides: "/assets/presentations/Vaibhav_ICHEP.pdf"
- title: Update
speaker: Vassil Vassilev
slides: "/assets/presentations/CR_11_07_2024.pdf"
- title: Next meeting
speaker: Vassil Vassilev
link: 5 Sep 1700
- name: "CaaS Monthly Meeting"
date: 2024-06-06 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/91331193595?pwd=FW3LpbZykgvVh5QwAEMNMA4Vk3TqOT)"
label: caas_06Jun2024
agenda:
- title: Update
speaker: Vassil Vassilev
slides: "/assets/presentations/CR_06_06_2024.pdf"
- title: Next meeting
speaker: Vassil Vassilev
link: 11 Jul 1700
- name: "CaaS Monthly Meeting"
date: 2024-04-04 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/99894195259?pwd=S1BRclMyY0NlQUx6bjBadldaU2t0UT09)"
label: caas_04Apr2024
agenda:
- title: Update
speaker: Vassil Vassilev
slides: "/assets/presentations/CR_04_04_2024.pdf"
- title: Next meeting
speaker: Vassil Vassilev
link: 6 Jun 1700
- name: "CaaS Monthly Meeting"
date: 2024-03-07 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/99894195259?pwd=S1BRclMyY0NlQUx6bjBadldaU2t0UT09)"
label: caas_07Mar2024
agenda:
- title: "IDD – A Platform Enabling Differential Debugging"
speaker:
image: "https://media.licdn.com/dms/image/C4E03AQHhvshc5Qb0ow/profile-displayphoto-shrink_800_800/0/1517263864752?e=1715212800&v=beta&t=6GUx6zvVq4rz1Va5rXGnla4LfH6b8Sd6rVWt-UYgAHM"
name: "Martin Vasilev"
bio: |
Martin Vassilev has research interest in the area of the compiler
construction and analysis of complex software systems. He has obtained
his PhD in 2020 in the University of Plovdiv "Paisii Hilendarski"
where he continued to develop his academic career. He is now senior
assistant professor in the Faculty of Mathematics and Informatics. He
continues to participate into the development of open source systems
like IDD and others.
description: |
Debugging is a very time consuming task which is not well supported by
existing tools. The existing methods do not provide tools enabling
optimal developers’ productivity when debugging regressions in complex
systems. It is described in this presentation a possible solution aiding
differential debugging. The differential debugging technique performs
analysis of the regressed system and identifying the cause of the
unexpected behavior by comparing to a previous version of the same
system. The prototype, idd, inspects two versions of the executable – a
baseline and a regressed version. The interactive debugging session runs
side by side both executables and allows to examine and to compare
various internal states. The architecture can work with multiple
information sources comparing data from different tools. Also it will be
shown how idd can detect performance regressions using information from
third-party performance facilities.
- title: Update
speaker: Vassil Vassilev
slides: "/assets/presentations/CR_07_03_2024.pdf"
- title: Next meeting
speaker: Vassil Vassilev
link: 4 Apr 1700
- name: "CaaS Monthly Meeting"
date: 2024-02-01 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92811687505?pwd=Zk13akpuUlowbjhqK0t1TDVPbS9Ydz09)"
label: caas_01Feb2024
agenda:
- title: "User-Schedulable Languages: Exo and Beyond"
speaker:
image: "https://media.licdn.com/dms/image/C5603AQHzxnclCX9tEw/profile-displayphoto-shrink_800_800/0/1597949617547?e=1712188800&v=beta&t=-vVNhjYV5MvUcua07Go3u6nPi43NVmPwnaIyULx8IOI"
name: "Yuka Ikarashi"
bio: |
Yuka Ikarashi is a fourth-year PhD candidate at MIT CSAIL, advised
by Jonathan Ragan-Kelley. She is interested in creating compiler
systems and programming languages for real-world applications. She
is a co-creator of the Exo programming language and has been a
developer for other compiler frameworks such as Clang/LLVM and ROOT.
She previously worked at Apple, Amazon, and CERN. She received
Masason Foundation Fellowship and Funai Foundation Fellowship awards.
description: |
Single-core performance has long been saturated, and it is critical to
exploit the peak performance of heterogeneous accelerators and
specialized instructions in many applications. Because compilers are
difficult to extend to support diverse and rapidly evolving hardware
targets, and automatic optimization is often insufficient to guarantee
state-of-the-art performance, high-performance libraries are commonly
still coded and optimized by hand, at great expense, in low-level C and
assembly. User schedulable languages, or USLs in short, have been
proposed to address the challenge by decoupling algorithms and
scheduling. In this talk, I will focus on one such USL, Exo, based on
the principle of exocompilation: externalizing target-specific code
generation support and optimization policies to user-level code. Exo
allows custom hardware instructions, specialized memories, and
accelerator configuration states to be defined in user libraries.
I will also talk about other projects that borrow the idea from USLs
and lessons we learned from the industry adoption of Exo.
- title: Update
speaker: Vassil Vassilev
slides: "/assets/presentations/CR_01_02_2024.pdf"
- title: Next meeting
speaker: Vassil Vassilev
link: 7 Mar 1700
- name: "CaaS Monthly Meeting"
date: 2024-01-11 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92811687505?pwd=Zk13akpuUlowbjhqK0t1TDVPbS9Ydz09)"
label: caas_11Jan2024
agenda:
- title: "Open Source Software For The Win"
speaker: "Saqib A (QuillPusher)"
description: |
This talk will cover notable OSS achievements, especially those that are
in contrast to big tech, striving to protect the consumers and their
data.
We'll start with GrapheneOS, a hardened fork of Android AOSP. Notably,
GrapheneOS makes upstream contributions to the Android Open Source
Project (AOSP) and other upstream projects, and many of its features
were implemented in AOSP, Linux, LLVM, and other projects that
GrapheneOS is based on.
GrapheneOS substantially expands the standard mitigations for memory
corruption vulnerabilities, and some of these features are designed to
directly catch the memory corruption bugs either via an explicit check
or memory protection and abort the program to prevent them from being
exploited.
slides: "/assets/presentations/Saqib-OSSFTW.pdf"
- title: Update
speaker: Vassil Vassilev
slides: "/assets/presentations/CR_11_01_2024.pdf"
- title: Next meeting
speaker: Vassil Vassilev
link: 1 Feb 1700
- name: "CaaS Monthly Meeting"
date: 2023-12-07 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/96034182995?pwd=QjFwaDVqazdFVGhvOHhyOFc1OVRZdz09)"
label: caas_07Dec2023
agenda:
- title: "Compiler-Research.org Status and Plans"
speaker: "Dr. Vassil Vassilev"
description: |
We will describe some of the past, ongoing and future activities of the
compiler-research group.
slides: "/assets/presentations/CaaS_07_12_2023.pdf"
- title: "Algorithmic Differentiation in Monte-Carlo Particle Simulations"
speaker: "Max Aehle"
description: |
Monte-Carlo simulators like Geant4 are heavily used in High Energy
Physics to simulate the interaction between particles and the detector
matter. Integrating algorithmic differentiation (AD) into such codes,
e.g. in order to obtain gradients for design optimization, comes with a
couple of technical and mathematical challenges.
On the technical side, most AD tools are not fully automatic for the
entire language standard, but require certain manual interventions or
exclude certain language constructs. The size and complexity of Geant4
with about one million lines of C++ code can turn seemingly little
restrictions into a massive amount of effort required before being able
to obtain algorithmic derivatives. In the first part of this talk, we
will give a brief description of our novel AD tool Derivgrind, which
brings the development efforts close to the possible minimum because it
operates on the machine code of the compiled primal program. We will
then demonstrate how it allows to compute correct algorithmic
derivatives in a very artificial setup using Geant4 code.
On the mathematical side, stochasticity and the frequent use of
non-differentiable operations like comparisons constitute severe
challenges. While AD allows us to obtain floating-point-accurate
derivatives of the precise sequence of real-arithmetic operations
conducted by the primal program, they may come with very large
variances, and their expected values may disagree with the derivative
of the function represented by the Monte-Carlo simulation in the limit
where the number of samples goes to infinity. These challenges need to
be assessed and attacked based on a mathematical understanding of the
computations performed by the Monte-Carlo simulation. In the second part
of this talk, we will report on recent progress in this area.
- title: Next meeting
speaker: Vassil Vassilev
link: 11 Jan 1700
- name: "CaaS Monthly Meeting"
date: 2023-09-20 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/96468729098?pwd=bkpCVHVXRmdMNzE4Y3BKSWZLZVNqUT09)"
label: caas_20Sep2023
agenda:
- title: "C++ as a service - rapid software development and dynamic interoperability with python and beyond"
speaker: "Dr. Vassil Vassilev"
description: |
The C++ programming language is used for many numerically intensive
scientific applications. A combination of performance and solid backward
compatibility has led to its use for many research software codes over
the past 20 years. Despite its power, C++ is often seen as difficult to
learn and inconsistent with rapid application development. Exploration
and prototyping is slowed down by the long edit-compile-run cycles
during development.
In this talk we show how to leverage our experience in interactive C++,
just-in-time compilation technology (JIT), dynamic optimizations, and
large scale software development to greatly reduce the impedance
mismatch between C++ and Python. We show how clang-repl generalizes
Cling in LLVM upstream to offer a robust, sustainable and
omnidisciplinary solution for C++ language interoperability. The
demonstrate how we have:
* advanced the interpretative technology to provide a state-of-the-art
C++ execution environment;
* enabled functionality which can provide native-like, dynamic runtime
interoperability between C++ and Python; and
* allowed utilization of heterogeneous hardware.
The presentation includes interactive session where we demonstrate some
of the capabilities of our system via the Jupyter interactive
environment.
video: "https://youtu.be/be89sF0WLrc"
slides: "/assets/presentations/V_Vassilev-CaaS_ShowCase.pdf"
- title: Next meeting
speaker: Vassil Vassilev
link: 5 Oct 1700
- name: "CaaS Monthly Meeting"
date: 2023-07-06 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/95701425283?pwd=TmJsV3FyK3kvU1Y3ZU81)"
label: caas_06Jul2023
agenda:
- title: Update
speaker: Vassil Vassilev
slides: "/assets/presentations/CaaS_06_07_2023.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil Vassilev
link: 7 Sep 1700
- name: "CaaS Monthly Meeting"
date: 2023-06-01 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92890799462?pwd=Tlp0MGJYRHZld05acWhOK0Vwa0YvZz09)"
label: caas_01Jun2023
agenda:
- title: Update
speaker: Vassil Vassilev
slides: "/assets/presentations/CaaS_01_06_2023.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil Vassilev
link: 6 Jul 1700
- name: "CaaS Monthly Meeting"
date: 2023-05-04 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92890799462?pwd=Tlp0MGJYRHZld05acWhOK0Vwa0YvZz09)"
label: caas_04May2023
agenda:
- title: Update
speaker: Vassil Vassilev
slides: "/assets/presentations/CaaS_04_05_2023.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil Vassilev
link: 1 Jun 1700
- name: "CaaS Monthly Meeting"
date: 2023-04-06 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92890799462?pwd=Tlp0MGJYRHZld05acWhOK0Vwa0YvZz09)"
label: caas_06Apr2023
agenda:
- title: "Numba 2023 and beyond. PIXIE and RVSDG"
speaker: "Siu Kwan Lam, Stuart Archibald"
description: |
The Numba project engineers are undertaking research into some new
technology in 2023, in this talk two of the larger areas of this
research will be presented. One part of this research aims to alter the
typical view of the compilation space as neither being JIT nor AOT, but
as a user defined continuum of options. A new AOT output format is being
developed, PIXIE, which helps to provide higher performance runtime
execution and also allows for cross library/whole program optimisation,
along with AOT re-specialisation. This talk will present the Numba 2023
target MVP, it will be able to combine AOT compiled C/C++ libraries from
Clang based toolchains with JIT compiled Python code to present a
continuum of compilation options to users based on their desired
compilation and runtime performance characteristics.
Another part of the research being undertaken is into Regionalise Value
State Dependence Graphs (RVSDGs). Its initial use will be to isolate the
Numba compiler frontend from the ever changing semantics of Python byte
code (Numba uses this as its input source, it’s a CPython implementation
detail). It will do this by transforming the CFGs derived from the byte
code into a structured form, that of the RVSDG. This talk will note some
of the numerous research opportunities anticipated as a result of using
this form, particularly with respect to IR design and the expected ease
with which new compiler passes can be written.
slides: "/assets/presentations/S_Lam_S_Archibald-CaaS_Numba_PIXIE.pdf"
- title: Update
speaker: Garima Singh
slides: "/assets/presentations/CaaS_06_04_2023.pdf"
- title: Round Table
- title: Next meeting
speaker: Garima Singh
link: 4 May 1700
- name: "CaaS Monthly Meeting"
date: 2023-03-02 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92890799462?pwd=Tlp0MGJYRHZld05acWhOK0Vwa0YvZz09)"
label: caas_02Mar2023
agenda:
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_02_03_2023.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 6 Apr 1700
- name: "CaaS Monthly Meeting"
date: 2023-02-02 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92890799462?pwd=Tlp0MGJYRHZld05acWhOK0Vwa0YvZz09)"
label: caas_02Feb2023
agenda:
- title: "Multiline input and Windows support in clang-repl"
speaker: "Sunho Kim, De Anza College, CA"
description: |
Efficient multiline input support in clang-repl has been worked on over
the last months. We formulated a RFC to extend the clang Lexer to
receive incremental in LLVM community and implemented it with received
feedbacks considered. Clang Lexer is now capable of lexing buffer
growing line by line while handling all complicated preprocessor
expressions correctly. Based on this groundwork, an efficient
incremental input support was added to clang-repl.
I will demonstrate these new additions to clang-repl with demoes, talk
about how do they work under the good, and talk about the future
direction. I will also briefly show demos of enhanced Windows support
in clang-repl featuring native static library and SEH exception
handling.
video: "https://youtu.be/jc5oj8ooG7s"
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_02_02_2023.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 2 Mar 1700
- name: "CaaS Monthly Meeting"
date: 2023-01-12 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92890799462?pwd=Tlp0MGJYRHZld05acWhOK0Vwa0YvZz09)"
label: caas_12Jan2023
agenda:
- title: "Finding the Higgs on RISC-V"
speaker: "Jonas Hahnfeld, CERN"
description: |
Abstract: RISC-V is a new computer architecture. It currently receives a
lot of attention from open source developers because the ISA itself is
royalty free and vendors can create hardware without paying licensing
fees. As with any new architecture, the software ecosystem has to catch
up once actual hardware is available. In this talk, I will present the
current status of Just-In-Time-Compilation support for RISC-V in LLVM,
how I made clang-repl work on RISC-V to interpret C++ code and
eventually bring up the whole of Cling and ROOT to run a first physics
analysis on this new architecture.
slides: "/assets/presentations/J_Hahnfeld-HiggsRISC-V.pdf"
video: "https://youtu.be/3PWeLGrF41g"
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_12_01_2023.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 2 Feb 1700
- name: "CaaS Monthly Meeting"
date: 2022-11-03 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92890799462?pwd=Tlp0MGJYRHZld05acWhOK0Vwa0YvZz09)"
label: caas_03Nov2022
agenda:
- title: "JITLink: Native Windows JITing in LLVM"
speaker: "Sunho Kim, De Anza College, CA"
description: |
JITLink is a new JIT linker in LLVM developed to eliminate limitations
in LLVM's JIT implementation. With JITLink, it is not required to use
special compilation flags or workarounds to load code into the JIT,
since most of the object file features including small code model and
thread local storage are fully implemented. This tutorial will explain
how to use JITLink by working on a windows JIT application that
just-in-time links to third-party static libraries. The tutorial will
also dig into internals of JITLink by working on a JITLink plugin
managing SEH exception tables.
slides: "/assets/presentations/S_Kim-Jitlink_Coff.pdf"
video: "https://youtu.be/_5_gm58sQIg"
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_03_11_2022.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 8 Dec 1700
- name: "CaaS Monthly Meeting"
date: 2022-10-06 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92890799462?pwd=Tlp0MGJYRHZld05acWhOK0Vwa0YvZz09)"
label: caas_06Oct2022
agenda:
- title: "jank: A Clojure dialect on LLVM with gradual typing, a native runtime, and C++ interop"
speaker: "Jeaye Wilkerson, Technical Director at Electronic Arts (EA)"
description: |
Following years of Lisp development, Clojure has entered the scene as a
practical Lisp for the JVM. It takes a functional-first approach to
designs and has extensive support for purely transforming persistent,
immutable data structures. The interactive programming experience
Clojure brings to the JVM is unmatched, built on both a JIT and
technology such as nREPL. Clojure developers use this interactive
programming to build their software from empty source files to working
servers, GUI applications, and more without restarting the process.
In the spirit of Clojure, I would like to present jank, a research
programming language which is a Clojure dialect built on native C++,
rather than the JVM, using Cling as its JIT compiler. jank aims to be
strongly compatible with Clojure while offering the same interactive
programming experience. Like Clojure, jank aims to provide seamless
interop with its host (meaning C++), allowing for easy consumption of
third-party libraries. On top of a native runtime, jank also aims to
provide gradual, structural typing, which will not be covered in this
presentation.
slides: "/assets/presentations/J_Wilkerson-Caas_Jank.pdf"
video: "https://youtu.be/l7KXd76ymVk"
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_06_10_2022.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 3 Nov 1700
- name: "CaaS Monthly Meeting"
date: 2022-09-01 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/97839750473?pwd=V3dVRTl6ekN5UEdURTRvTHZPQ25Wdz09)"
label: caas_01Sep2022
agenda:
- title: Update
speaker: Vassil
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 6 Oct 1700
- name: "CaaS Monthly Meeting"
date: 2022-08-04 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/97839750473?pwd=V3dVRTl6ekN5UEdURTRvTHZPQ25Wdz09)"
label: caas_04Aug2022
agenda:
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_04_08_2022.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 1 Sep 1700
- name: "CaaS Monthly Meeting"
date: 2022-07-07 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/97839750473?pwd=V3dVRTl6ekN5UEdURTRvTHZPQ25Wdz09)"
label: caas_07Jul2022
agenda:
- title: Update
speaker: Ioana
slides: "/assets/presentations/CaaS_07_07_2022.pdf"
- title: Round Table
- title: Next meeting
speaker: Ioana
link: 4 Aug 1700
- name: "CaaS Monthly Meeting"
date: 2022-06-09 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/97839750473?pwd=V3dVRTl6ekN5UEdURTRvTHZPQ25Wdz09)"
label: caas_09Jun2022
agenda:
- title: "Cling for live coding music and musical instruments"
speaker: "Jack Armitage, Intelligent Instruments Lab"
description: |
The artistic live coding community has been growing steadily since
around the year 2000. The Temporary Organisation for the Permanence of
Live Art Programming (TOPLAP) has been around since 2004, Algorave
(algorithmic rave parties) recently celebrated its tenth birthday, and
six editions of the International Conference on Live Coding (ICLC) have
been held. A great many live coding systems have been developed during
this time, many of them exhibiting exotic and culturally specific
features that professional software developers are mostly unaware of.
This talk will introduce the artistic live coding context and
community, and then describe attempts by this community to appropriate
the Cling C++ interpreter for artistic practice. In one such example,
Cling has been used as the basis for a C++ based live coding
synthesiser [1]. In another example, Cling has been installed on a
BeagleBoard to bring live coding to the Bela interactive audio
platform [2]. Following these examples, I will offer some reflections
on the potential mutual benefits for increased engagement between the
Cling community and the artistic live coding community.
[1] [tiny spectral synthesizer with livecoding support](https://github.com/nwoeanhinnogaehr/tinyspec-cling)\
[2] [Using the Cling C++ Interpreter on the Bela Platform](https://gist.github.com/jarmitage/6e411ae8746c04d6ecbee1cbc1ebdcd4)
slides: "/assets/presentations/J_Armitage-CaaS_Live_Coding_Music.pdf"
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_09_06_2022.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 7 Jul 1700
- name: "CaaS Monthly Meeting"
date: 2022-05-05 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92393493356?pwd=SHYxY0MxdFNPZm5wdzRCeDZxK3VYQT09)"
label: caas_05May2022
agenda:
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_05_05_2022.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 9 Jun 1700
- name: "CaaS Monthly Meeting"
date: 2022-04-07 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92393493356?pwd=SHYxY0MxdFNPZm5wdzRCeDZxK3VYQT09)"
label: caas_07Apr2022
agenda:
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_07_04_2022.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 5 May 1700
- name: "CaaS Monthly Meeting"
date: 2022-03-10 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92393493356?pwd=SHYxY0MxdFNPZm5wdzRCeDZxK3VYQT09)"
label: caas_10Mar2022
agenda:
- title: "ez-clang: experimental C++ REPL for bare metal"
speaker: "Stefan Gränitz, LLVM Orc JIT developer"
description: |
In 2021 a new remote-JIT layer "RemoteEPC" landed in LLVM's OrcJIT
library [0]. It separates serialization from transport, streamlines
error behavior and integrates well with ExecutorProcessControl. Combined
with the clean design and extensibility of ORCv2 and JITLink, it lowers
the bar for building exotic out-of-process LLVM bitcode JITs.
The ez-clang project [1] makes use of all these to build a pure
out-of-process REPL specifically designed for very low-resource embedded
devices. The executor endpoint on the device is very simple and fits
into a few Kilobytes of memory. All heavy lifting happens in the JIT
process on the host.
I want to present my proof-of-concept implementation, which is based on
a hacked-up version of cling [2] (bringing in Clang-integration, a
command line and the concept of transaction-based incremental
compilation). Right now, it supports a small selection of Cortex-M
development boards. The smallest is the TeensyLC [3] with an ARMv6-M
instruction set, 62kb Flash memory and 8kb RAM.
\
[0] [https://github.com/llvm/llvm-project/commit/bb27e4564355](https://github.com/llvm/llvm-project/commit/bb27e4564355)\
[1] [https://echtzeit.dev/ez-clang](https://echtzeit.dev/ez-clang)\
[2] [https://github.com/root-project/cling](https://github.com/root-project/cling)\
[3] [https://www.pjrc.com/teensy/teensyLC.html](https://www.pjrc.com/teensy/teensyLC.html)
slides: "/assets/presentations/S_Graenitz-CaaS_EzClang.pdf"
video: "https://youtu.be/gKNxTeDBczk"
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_10_03_2022.pdf"
- title: Round Table
- title: Next meeting
link: 7 Apr 1700
- name: "CaaS Monthly Meeting"
date: 2022-02-03 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92393493356?pwd=SHYxY0MxdFNPZm5wdzRCeDZxK3VYQT09)"
label: caas_03Feb2022
agenda:
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_03_02_2022.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 10 Mar 1700
- name: "CaaS Monthly Meeting"
date: 2022-01-13 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92393493356?pwd=SHYxY0MxdFNPZm5wdzRCeDZxK3VYQT09)"
label: caas_13Jan2022
agenda:
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_13_01_2022.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 3 Feb 1700
- name: "CaaS Monthly Meeting"
date: 2021-12-09 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92544354004?pwd=ajFYajc5bnhFWXBOdFVrMXdFRSt3Zz09)"
label: caas_09Dec2021
agenda:
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_09_12_2021.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 13 Jan 1700
- name: "CaaS Monthly Meeting"
date: 2021-11-11 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92544354004?pwd=ajFYajc5bnhFWXBOdFVrMXdFRSt3Zz09)"
label: caas_11Nov2021
agenda:
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_11_11_2021.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 9 Dec 1700
- name: "CaaS Monthly Meeting"
date: 2021-10-07 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92544354004?pwd=ajFYajc5bnhFWXBOdFVrMXdFRSt3Zz09)"
label: caas_07Oct2021
agenda:
- title: "Proposal for a C++ Language Interoperability Layer"
speaker: "Vassil Vassilev, Princeton"
description: |
The C++ programming language is used for many numerically intensive
scientific applications. A combination of performance and solid backward
compatibility has led to its use for many research software codes over
the past 20 years. Despite its power, C++ is often seen as difficult to
learn and inconsistent with rapid application development. Exploration
and prototyping is slowed down by the long edit-compile-run cycles
during development. Exploratory programming is an effective way to gain
a deeper understanding of a project's requirements; reduce the
complexity of a problem; and provide an early validation of the system’s
design and implementation. This is amongst the strengths of Python and a
major design goal of new languages such as Julia, D and Swift.
Two of the most widely used languages by researchers are C++ and Python.
Python has grown steadily as a language of choice for data science and
application control. The interactive nature of Python and its many
available libraries make it an excellent choice for scripting tasks and
code prototyping. However, native computational performance of Python is
mediocre. Python includes functionality for replacing the most critical
components of a processing kernel with implementations in C. This
functionality is insufficient to fully cover many scientific use cases
because crossing the language boundary is expensive due to limitations
in current tools.
This talk describes key aspects of language interoperability for C++
using an automated binding approach. The primary initial focus is to
support automatic binding to and from Python. Furthermore, the approach
is generic enough to fit other languages such as D and Julia.
slides: "/assets/presentations/V_Vassilev-CaaS_LibInterOp.pdf"
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_07_10_2021.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 4 Nov 1700
- name: "CaaS Monthly Meeting"
date: 2021-09-02 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92544354004?pwd=ajFYajc5bnhFWXBOdFVrMXdFRSt3Zz09)"
label: caas_02Sep2021
agenda:
- title: "Cppyy"
speaker: "Wim Lavrijsen, LBL"
description: |
cppyy provides automatic Python bindings to C++ code, at runtime,
through Cling, the C++ interpreter. Python is itself a dynamic language
executed by an interpreter, thus the interaction with C++ code becomes
more natural when intermediated by Cling. Examples include runtime
template instantiations, callbacks, cross-language inheritance,
automatic downcasting, and exception mapping. Many advanced C++ features
such as placement new, multiple virtual inheritance, variadic templates,
etc., are also naturally handled.
cppyy achieves high performance through an all-lazy approach and
specialization of common cases through runtime reflection. As such, it
has a much lower call overhead than other binders, notably in its
implementation for PyPy, a fully compatible Python interpreter sporting
a tracing JIT. Furthermore, cppyy makes maintaining a large software
stack simpler: except for cppyy’s own python-interpreter binding, it
does not have any compiled code that is Python-dependent. I.e.,
cppyy-based extension modules require no recompilation when switching
Python interpreters.
In this presentation I'll show the benefits of runtime Python-C++
bindings and give a bird's eye overview of the implementation
underpinning cppyy.
slides: "/assets/presentations/W_Lavrijsen-CaaS_Cppyy.pdf"
video: "https://youtu.be/stMD7VDWlVU"
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_02_09_2021.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 7 October 1700
- name: "CaaS Monthly Meeting"
date: 2021-08-05 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92544354004?pwd=ajFYajc5bnhFWXBOdFVrMXdFRSt3Zz09)"
label: caas_05Aug2021
agenda:
- title: "A brief history of Cxx.jl"
speaker: "Keno Fischer, JuliaComputing"
description: |
Cxx.jl is one of the oldest Julia packages and provides extremely tight
integration between Julia and C++. With advanced features including a
C++, REPL environment, the ability to perform cross-language template
instantiation as well as cross-language object implementation, it is a
powerful tool for developers seeking to integrate the two languages.
However, despite these capabilities, the package never fully became
mainstream due to a number of technical limitations. In this talk, I
will explore the design and featureset of Cxx.jl, and what limitations
in Clang and Julia prevented its full adoption in the Julia world.
slides: "/assets/presentations/K_Fischer_Cxx_jl.pdf"
video: "https://youtu.be/bJiwjKIWgjM"
- title: "Calling ROOT from Julia in practice"
speaker: "Oliver Schulz, Max-Planck-Institut für Physik"
description: |
Julia can directly call C++ via the Cxx.jl package. This enables is to
use basically all of ROOT's capabilities directly from Julia, including
reading/writing TFiles and user ROOT's GUI features. I'll present some
past experiences and practical examples of Julia/ROOT interaction.
slides: "/assets/presentations/O_Schulz-Julia_ROOT.pdf"
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_05_08_2021.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 2 September 1700
- name: "CaaS Monthly Meeting"
date: 2021-07-01 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92544354004?pwd=ajFYajc5bnhFWXBOdFVrMXdFRSt3Zz09)"
label: caas_01Jul2021
agenda:
- title: "ORC 2021 -- Recent developments and future work in LLVM's JIT APIs"
speaker: "Lang Hames, Apple"
description: |
LLVM’s On Request Compilation (ORC) APIs provide a foundation for
building in-memory and just-in-time compilers by re-using existing
static compilers. This re-use is enabled by appending a new linking
step to the standard compiler pipeline to patch the compiler output into
the executing process. The ORC APIs support concurrent compilation, lazy
compilation, and linking of code across process boundaries and even
across architectures. The ORC APIs are already used in several open
source projects including PostgreSQL, Cling, Julia, and the Swift
interpreter; and they remain under active development with new features
added frequently. This talk will provide an overview of the ORC APIs and
recent developments, as well as demos and pointers to example code.
slides: "/assets/presentations/L_Hames-CaaS_ORC_JitLink.pdf"
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_01_07_2021.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 5 August 1700
- name: "CaaS Monthly Meeting"
date: 2021-06-03 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92544354004?pwd=ajFYajc5bnhFWXBOdFVrMXdFRSt3Zz09)"
label: caas_03Jun2021
agenda:
- title: "Cymbl: To -jInfinity & Beyond"
speaker: "William Moses, MIT"
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_03_06_2021.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 1 July 1700
- name: "CaaS Monthly Meeting"
date: 2021-05-06 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/92544354004?pwd=ajFYajc5bnhFWXBOdFVrMXdFRSt3Zz09)"
label: caas_06May2021
agenda:
- title: "GPU Acceleration of Automatic Differentiation in C++ with Clad"
speaker: "Ioana Ifrim, Princeton"
slides: "/assets/presentations/I_Ifrim-GPU_AD.pdf"
video: "https://youtu.be/wberEoq-m38"
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_06_05_2021.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 3 June 1700
- name: "CaaS Monthly Meeting"
date: 2021-03-25 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/98188314867?pwd=Q2tJWlN1Qkk0eStJc3lCWnRvQ250QT09)"
label: caas_25Mar2021
agenda:
- title: "Deep dive into the Xeus-based Cling kernel for Jupyter"
speaker: "Sylvain Corlay, QuantStack"
slides: "/assets/presentations/S_Corlay-CaaS_Xeus-Cling.pdf"
video: https://youtu.be/kx3wvKk4Qss
description: |
Sylvain Corlay from QuantStack talks about C++ in Jupyter Notebooks
using the Xeus-Cling. Xeus-Cling is a Cling-based notebook kernel which
delivers interactive C++. Sylvain makes a deep dive in topic outlining
some of the specific challenges and requirements.
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_25_03_2021.pdf"
- title: Round Table
- title: Next meeting
speaker: Vassil
link: 6 May 1700
- name: "CaaS Monthly Meeting"
date: 2021-03-04 17:00:00 +0200
time_cest: "17:00"
connect: "[Link to zoom](https://princeton.zoom.us/j/98188314867?pwd=Q2tJWlN1Qkk0eStJc3lCWnRvQ250QT09)"
label: caas_04Mar2021
agenda:
- title: "Cling’s CUDA Backend: Interactive GPU development with CUDA C++"
speaker: "Simeon Ehrig, HZDR"
slides: "/assets/presentations/S_Ehrig-CaaS_Cling-CUDA.pdf"
video: https://youtu.be/HEGDII5lAfo
description: |
Simeon Ehrig from Helmholtz-Zentrum Dresden-Rossendorf (HZDR) shared his
work with us recently. In his talk he gives insights about interactive
CUDA using the C++ interpreter Cling. He shows several exciting examples
in the area of dynamic execution without loss of state where we can
"checkpoint" the execution state, add specific data analysis and reuse
the previous computations.
- title: Update
speaker: Vassil
slides: "/assets/presentations/CaaS_04_03_2021.pdf"