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[test] Deflake test/profile/ContinuousSyncMode/online-merging.c 

This test spawns 32 child processes which race to update counters on
shared memory pages. On some Apple-internal machines, two processes race
to perform an update in approximately 0.5% of the test runs, leading to
dropped counter updates. Deflake the test by using atomic increments.

Tested with:

```
$ for I in $(seq 1 1000); do echo ":: Test run $I..."; ./bin/llvm-lit projects/compiler-rt/test/profile/Profile-x86_64h/ContinuousSyncMode/online-merging.c -av || break; done
```

rdar://64956774
This commit is contained in:
Vedant Kumar 2020-07-02 13:28:48 -07:00
parent 359345d609
commit 47481cbffb
1 changed files with 3 additions and 3 deletions
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6
compiler-rt/test/profile/ContinuousSyncMode/online-merging.c
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@ -8,9 +8,9 @@
// Create two DSOs and a driver program that uses them.
// RUN: echo "void dso1(void) {}" > dso1.c
// RUN: echo "void dso2(void) {}" > dso2.c
// RUN: %clang_pgogen -dynamiclib -o %t.dir/dso1.dylib dso1.c
// RUN: %clang_pgogen -dynamiclib -o %t.dir/dso2.dylib dso2.c
// RUN: %clang_pgogen -o main.exe %s %t.dir/dso1.dylib %t.dir/dso2.dylib
// RUN: %clang_pgogen -dynamiclib -o %t.dir/dso1.dylib dso1.c -mllvm -instrprof-atomic-counter-update-all=1
// RUN: %clang_pgogen -dynamiclib -o %t.dir/dso2.dylib dso2.c -mllvm -instrprof-atomic-counter-update-all=1
// RUN: %clang_pgogen -o main.exe %s %t.dir/dso1.dylib %t.dir/dso2.dylib -mllvm -instrprof-atomic-counter-update-all=1
//
// === Round 1 ===
// Test merging+continuous mode without any file contention.