[llvm-dev] Buildbots timing out on full builds

[Diana Picus via llvm-dev]

Ok, thanks. I'll try to do a bisect next week to see if I can find it.

Cheers,
Diana

On 19 May 2017 at 16:29, Daniel Sanders <daniel_l_sanders at apple.com> wrote:
>
>> On 19 May 2017, at 14:54, Daniel Sanders via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>>
>> r303259 will have increased compile-time since it tripled the number of importable
>> SelectionDAG rules but a quick measurement building the affected file:
>>    ninja lib/Target/<Target>/CMakeFiles/LLVM<Target>CodeGen.dir/<Target>InstructionSelector.cpp.o
>> for both ARM and AArch64 didn't show a significant increase. I'll check whether
>> it made a different to linking.
>
> I don't think it's r303259. Starting with a fully built r303259, then updating to r303258 and running 'ninja' gives me:
>         real    2m28.273s
>         user    13m23.171s
>         sys     0m47.725s
> then updating to r303259 and running 'ninja' again gives me:
>         real    2m19.052s
>         user    13m38.802s
>         sys     0m44.551s
>
>> sanitizer-x86_64-linux-fast also timed out after one of my commits this morning.
>>
>>> On 19 May 2017, at 14:14, Diana Picus <diana.picus at linaro.org> wrote:
>>>
>>> Hi,
>>>
>>> We've noticed that recently some of our bots (mostly
>>> clang-cmake-armv7-a15 and clang-cmake-thumbv7-a15) started timing out
>>> whenever someone commits a change to TableGen:
>>>
>>> r303418: http://lab.llvm.org:8011/builders/clang-cmake-armv7-a15/builds/7268
>>> r303346: http://lab.llvm.org:8011/builders/clang-cmake-armv7-a15/builds/7242
>>> r303341: http://lab.llvm.org:8011/builders/clang-cmake-armv7-a15/builds/7239
>>> r303259: http://lab.llvm.org:8011/builders/clang-cmake-armv7-a15/builds/7198
>>>
>>> TableGen changes before that (I checked about 3-4 of them) don't have
>>> this problem:
>>> r303253: http://lab.llvm.org:8011/builders/clang-cmake-armv7-a15/builds/7197
>>>
>>> That one in particular actually finishes the whole build in 635s,
>>> which is only a bit over 50% of the timeout limit (1200s). So, between
>>> r303253 and now, something happened that made full builds
>>> significantly slower. Does anyone have any idea what that might have
>>> been? Also, has anyone noticed this on other bots?
>>>
>>> Thanks,
>>> Diana
>>
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