[PATCH] D28789: [lit] Support sharding testsuites, for parallel execution.

[Graydon Hoare via Phabricator via llvm-commits]

graydon created this revision.
Herald added a reviewer: modocache.

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 0..M-1.

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.


https://reviews.llvm.org/D28789

Files:
  docs/CommandGuide/lit.rst
  utils/lit/lit/main.py
  utils/lit/tests/selecting.py

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