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[OrderFiles] Don't allow lit to run dtrace multithreaded 

Dtrace is implemented to try and minimize performance impact on the process being traced. This results in dtrace dropping samples if it is taking too many CPU resources. Multi-threading dtrace increases the sample drop rate dramatically.

llvm-svn: 266213
This commit is contained in:
Chris Bieneman 2016-04-13 17:12:56 +00:00
parent 54e5000e2a
commit f5a7ec7a5c
1 changed files with 1 additions and 0 deletions
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clang/utils/perf-training/CMakeLists.txt
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@ -48,6 +48,7 @@ if(DTRACE)
add_lit_testsuite(generate-dtrace-logs "Generating clang dtrace data"
${CMAKE_CURRENT_BINARY_DIR}/order-files/
ARGS -j 1
DEPENDS clang clear-dtrace-logs
)