Add AArch64 SVE2 Vector Length Agnostic builders #317
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Aside from the new CPU and different core/RAM amounts, these
will be the same as our existing Gravition 3 ("g3") workers.
Not adding SVE VLS at this point to keep disk usage reasonable
and hedge against any stability issues.
These generate code that uses the SVE2 extension, as opposed to our existing builders that only use SVE. Therefore they will run on our Graviton 4 workers only, which are Neoverse v2 cores with SVE and SVE2. The optimisation guide: https://github.com/aws/aws-graviton-getting-started/blob/main/c-c++.md Suggests -mcpu=neoverse-v2 for best performance, but here I'm using it just so we get the SVE2 feature enabled. If we used the balanced -mcpu=neoverse-512tvb, we wouldn't get SVE2 without fiddly extra flags. ``` $ ~/clang+llvm-18.1.8-aarch64-linux-gnu/bin/clang /tmp/test.c -o /dev/null -mcpu=neoverse-v2 -### <...> "-target-feature" "+sve" "-target-feature" "+sve2-bitperm" "-target-feature" "+sve2" <...> ``` I have not added vector length settings as these builders will generate scalable ("length agnostic" - LA) code. Otherwise, the builders have identical setups to the existing SVE VLA builders.
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The first 2 commits of this are #311. Please review only the last commit here. @maxim-kuvyrkov please confirm that this is exactly what was requested. |
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I've also confirmed that at least right now, these configurations are green. They will be silent to begin with anyway, so that we can work out any capacity issues. |
maxim-kuvyrkov
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Nov 21, 2024
| }, | ||
| testsuite_flags=[ | ||
| '--cppflags', '-mcpu=neoverse-v2 -mllvm -scalable-vectorization=preferred -mllvm -treat-scalable-fixed-error-as-warning=false -O3', | ||
| '--threads=32', '--build-threads=32'], |
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The current instances have 48 cores and 4GB RAM per core, so we should be OK with max parallelism of 48. Same comment below for 2stage builder.
| @@ -586,8 +586,7 @@ | |||
| "-DCMAKE_CXX_FLAGS='-mcpu=neoverse-v2'", | |||
| "-DLLVM_ENABLE_LLD=True", | |||
| "-DMLIR_INCLUDE_INTEGRATION_TESTS=True", | |||
| "-DMLIR_RUN_ARM_SVE_TESTS=True", | |||
| "-DLLVM_LIT_ARGS='-v'"])}, | |||
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[Just checking] Will you remove "-v" from the existing configurations in a separate PR?
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These generate code that uses the SVE2 extension, as opposed to our existing builders that only use SVE. Therefore they will run on our Graviton 4 workers only, which are Neoverse v2 cores with SVE and SVE2.
The optimisation guide:
https://github.com/aws/aws-graviton-getting-started/blob/main/c-c++.md
Suggests -mcpu=neoverse-v2 for best performance, but here I'm using it just so we get the SVE2 feature enabled. If we used the balanced -mcpu=neoverse-512tvb, we wouldn't get SVE2 without fiddly extra flags.
I have not added vector length settings as these builders will generate scalable ("length agnostic" - LA) code.
Otherwise, the builders have identical setups to the existing SVE VLA builders.