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Graydon Hoare 57f557b15d [lit] Support sharding testsuites, for parallel execution. 
Summary:
This change equips lit.py with two new options, --num-shards=M and
--run-shard=N (set by default from env vars LIT_NUM_SHARDS and LIT_RUN_SHARD).

The options must be used together, and N must be in 1..M.

Together these options effect only test selection: they partition the testsuite
into M equal-sized "shards", then select only the Nth shard. They can be used
in a cluster of test machines to achieve a very crude (static) form of
parallelism, with minimal configuration work.

Reviewers: modocache, ddunbar

Reviewed By: ddunbar

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D28789

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292417 91177308-0d34-0410-b5e6-96231b3b80d8
2017-01-18 18:12:20 +00:00
..
examples
lit [lit] Support sharding testsuites, for parallel execution. 2017-01-18 18:12:20 +00:00
tests [lit] Support sharding testsuites, for parallel execution. 2017-01-18 18:12:20 +00:00
utils Fix some bashims. More information on https://wiki.ubuntu.com/DashAsBinSh. Reported initially on https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=772302 & https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=772301 2015-02-01 14:55:43 +00:00
lit.py [lit] Remove (or allow specific) unused imports 2016-10-10 01:22:06 +00:00
MANIFEST.in [lit] Add a README.txt. 2014-03-10 21:58:12 +00:00
README.txt [lit] Remove TODO 2016-11-03 23:41:49 +00:00
setup.py

README.txt 

===============================
 lit - A Software Testing Tool
===============================

lit is a portable tool for executing LLVM and Clang style test suites,
summarizing their results, and providing indication of failures. lit is designed
to be a lightweight testing tool with as simple a user interface as possible.

=====================
 Contributing to lit
=====================

Please browse the Test Suite > lit category in LLVM's Bugzilla for ideas on
what to work on.

Before submitting patches, run the test suite to ensure nothing has regressed:

    # From within your LLVM source directory.
    utils/lit/lit.py \
        --path /path/to/your/llvm/build/bin \
        utils/lit/tests

Note that lit's tests depend on 'not' and 'FileCheck', LLVM utilities.
You will need to have built LLVM tools in order to run lit's test suite
successfully.

You'll also want to confirm that lit continues to work when testing LLVM.
Follow the instructions in http://llvm.org/docs/TestingGuide.html to run the
regression test suite:

    make check-llvm

And be sure to run the llvm-lit wrapper script as well:

    /path/to/your/llvm/build/bin/llvm-lit utils/lit/tests

Finally, make sure lit works when installed via setuptools:

    python utils/lit/setup.py install
    lit --path /path/to/your/llvm/build/bin utils/lit/tests