[llvm-dev] beta: cloud compiler bisection tool

Yaron Keren via llvm-dev llvm-dev at lists.llvm.org
Thu Oct 8 22:22:01 PDT 2015

This make bisection much more practical, thanks!

2015-10-09 1:50 GMT+03:00 Eric Christopher via llvm-dev <
llvm-dev at lists.llvm.org>:

> Woo! Thanks Chris and Daniel!
> -eric
> On Thu, Oct 8, 2015 at 3:33 PM Chris Matthews via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>> I am happy to announce we are contributing one of our favorite internal
>> tools: llvm bisect!
>> First: I want to thank Daniel Dunbar for writing all the code for this
>> tool, and Google for providing cloud storage and bandwidth to host it!
>> We keep the compilers we build in the Green Dragon CI cluster, and now
>> upload them to the Google Storage Cloud.  The llvmlab bisect tool, takes
>> those compilers and allows you to quickly bisect on a predicate.  Instead
>> of compiling those compilers again, the tool downloads them from the
>> cloud.  The tool allows you to down download and run compilers, or bisect
>> on a range of commits with a predicate.   Example, find where a crash
>> started:
>> $ llvmlab bisect bash -c "%(path)s/bin/clang -c crashy.c”
>> FAIL: clang-r219899-t2014-10-15_21-42-48-b809
>> FAIL: clang-r219778-t2014-10-15_06-18-17-b787
>> FAIL: clang-r219773-t2014-10-14_21-18-07-b779
>> FAIL: clang-r219746-t2014-10-14_17-01-07-b775
>> FAIL: clang-r219739-t2014-10-14_16-09-35-b771
>> FAIL: clang-r219729-t2014-10-14_15-21-29-b757
>> clang-r219719-t2014-10-14_14-46-50-b756: first working build
>> clang-r219729-t2014-10-14_15-21-29-b757: next failing build
>> Grab the most recent compiler from a build:
>> $ llvmlab fetch "clang-stage1-configure-RA_build”
>> downloaded root: clang-r249752-b13228.tar.gz
>> extracted path : clang-r249752-b13228
>> For this initial release, I am uploading the ~18000 compilers produced on
>> Green Dragon, which span the last 8 months of builds. As well, all new
>> builds on Green Dragon upload their compilers right away.  These are Darwin
>> compilers, in release asserts and release + LTO configurations.  More
>> configurations will be made available soon, including ASANified compilers
>> and release branch compilers.
>> The tool is in the zorg repo, in the llvmbisect directory. You install it
>> like a regular python program.  There are extensive docs with many examples
>> included.
>> I invite other bot owners to to upload their compilers as well.  You will
>> need the Google Storage tool installed on your bot, as well as an account.
>> Contact me if you are interested, and I can help you get setup.
>> Happy bisecting!
>> _______________________________________________
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>> llvm-dev at lists.llvm.org
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