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testing: document -race goroutine limits

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-race sets a hard cap of 8,192, which is easily hit while testing.

Fixes #23611

Change-Id: I0f720ec39c82c2194a485d437d6373f4bdc8a9c1
Reviewed-on: https://go-review.googlesource.com/103160
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Eric Lagergren 2018-03-28 18:09:17 -07:00 committed by Rob Pike
parent cc936d12bd
commit 4907c62f99
1 changed files with 3 additions and 0 deletions
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3
src/testing/testing.go
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@ -178,6 +178,9 @@
// } // }
// } // }
// //
// The race detector kills the program if it exceeds 8192 concurrent goroutines,
// so use care when running parallel tests with the -race flag set.
//
// Run does not return until parallel subtests have completed, providing a way // Run does not return until parallel subtests have completed, providing a way
// to clean up after a group of parallel tests: // to clean up after a group of parallel tests:
// //