[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.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@266213 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/perf-training/CMakeLists.txt b/utils/perf-training/CMakeLists.txt
index f8647a0e44f7fae908936400475b03e9ddd9ec71..07d90246107babb24e6334da73203b9b5830a5f1 100644 (file)
--- a/utils/perf-training/CMakeLists.txt
+++ b/utils/perf-training/CMakeLists.txt
@@ -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
     )