CPU usage too high

[derchrisuk]

Hi,

I'm currently trying to get the Open Source version to run on an Atom 330 Quad-core CPU with i915 Graphics running on Ubuntu Server 17.04.
Applied some patches as in #57 and #41 prior to the compile.
After some reading I figured out I need X running as well.
So to keep it minimal I have no Window Manager running, just plain Xorg, and I run info-beamer like this as user 'flip':

/usr/bin/xinit /usr/bin/dbus-launch --exit-with-session /usr/local/bin/info-beamer /home/flip/infobeamer_nodes/ -- :0 -nolisten tcp vt7

This is the output I get:

X.Org X Server 1.19.3
Release Date: 2017-03-15
X Protocol Version 11, Revision 0
Build Operating System: Linux 4.4.0-70-generic x86_64 Ubuntu
Current Operating System: Linux flipflop 4.10.0-20-generic #22-Ubuntu SMP Thu Apr 20 09:22:42 UTC 2017 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.10.0-20-generic root=/dev/mapper/flipflop--vg-root ro
Build Date: 28 March 2017  06:16:52AM
xorg-server 2:1.19.3-1ubuntu1 (For technical support please see http://www.ubuntu.com/support)
Current version of pixman: 0.34.0
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Wed May  3 16:10:28 2017
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
Info Beamer 1.0pre4.47a5ea+Lua 5.1 (http://info-beamer.org/)
Copyright (c) 2015 Florian Wesch <[email protected]>

[main.c] chdir /home/flip
[main.c] root node is infobeamer_nodes
[main.c] tcp/udp port is 4444
[main.c] initial size is 1024x768
libGL error: failed to open drm device: Permission denied
libGL error: failed to load driver: i915
[infobeamer_nodes] update +silkscreen.ttf
[infobeamer_nodes] kernel: booting node
[main.c] initialization completed
[framebuffer.c] new framebuffer (1024x768): 1
[infobeamer_nodes] timeout
[infobeamer_nodes] blacklisted for 60 seconds
[infobeamer_nodes] runtime error: kernel.lua:482: CPU usage too high
stack traceback:
        [C]: in function 'error'
        kernel.lua:482: in function <kernel.lua:481>
        [C]: in function 'render_self'
        kernel.lua:474: in function <kernel.lua:434>
[infobeamer_nodes] node is blacklisted
[framebuffer.c] new framebuffer (1024x768): 2
[infobeamer_nodes] node is blacklisted
[infobeamer_nodes] node is blacklisted

I'm using the simple Hello World example.
The 'node is blacklisted' is looping forever.
Not sure about the two libGL errors, and if they are causing all this.

[derchrisuk]

I have installed a Gnome GUI in the meantime.
Enabled Debug, as a normal run would segfault.
This is the BT from gdb

(gdb) run /home/flip/infobeamer_nodes/
Starting program: /usr/local/bin/info-beamer /home/flip/infobeamer_nodes/
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Info Beamer 1.0pre4.47a5ea+Lua 5.1 (http://info-beamer.org/)
Copyright (c) 2015 Florian Wesch <[email protected]>

[main.c] chdir /home/flip
[main.c] root node is infobeamer_nodes
[main.c] tcp/udp port is 4444
[main.c] initial size is 1024x768
[infobeamer_nodes] update +silkscreen.ttf
[infobeamer_nodes] kernel: booting node
[main.c] initialization completed
[framebuffer.c] new framebuffer (1024x768): 1

Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x000055555555d15e in node_render_to_image (L=0x55555599c470, node=0x55555577d1a0 <root>) at main.c:719
#2  0x000055555555a0be in luaRenderSelf (L=0x55555599c470) at main.c:366
#3  0x00007ffff7bb53b0 in ?? () from /usr/lib/x86_64-linux-gnu/liblua5.1.so.0
#4  0x00007ffff7bc0062 in ?? () from /usr/lib/x86_64-linux-gnu/liblua5.1.so.0
#5  0x00007ffff7bb582d in ?? () from /usr/lib/x86_64-linux-gnu/liblua5.1.so.0
#6  0x00007ffff7bb4ade in ?? () from /usr/lib/x86_64-linux-gnu/liblua5.1.so.0
#7  0x00007ffff7bb599b in ?? () from /usr/lib/x86_64-linux-gnu/liblua5.1.so.0
#8  0x00007ffff7bb13f8 in lua_pcall () from /usr/lib/x86_64-linux-gnu/liblua5.1.so.0
#9  0x00005555555599a3 in lua_timed_pcall (node=0x55555577d1a0 <root>, in=3, out=0, error_handler_pos=7) at main.c:223
#10 0x0000555555559bd5 in lua_node_enter (node=0x55555577d1a0 <root>, args=3, bin=PROFILE_EVENT) at main.c:267
#11 0x0000555555559ff1 in node_render_self (node=0x55555577d1a0 <root>, width=1024, height=768) at main.c:338
#12 0x000055555556490c in tick () at main.c:1450
#13 0x0000555555564f43 in main (argc=2, argv=0x7fffffffe118) at main.c:1585

[dividuum]

Might be the same problem as #59? What's in main.c:719?

[derchrisuk]

Sorry for the delay.
Line 719 in main.c:

glUseProgram(0);