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Bug 1079657 - DMD: Remove the "stress" mode. r=erahm.

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--HG--
extra : rebase_source : d0b233a62c1b50facb27d781f9942628f100180e
This commit is contained in:
Nicholas Nethercote 2014-10-08 14:56:46 -07:00
parent 49e418d6db
commit 7c2c456eee
1 changed files with 2 additions and 93 deletions
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95
memory/replace/dmd/DMD.cpp
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@ -291,8 +291,7 @@ class Options
enum Mode {
Normal, // run normally
Test, // do some basic correctness tests
Stress // do some performance stress tests
Test // do some basic correctness tests
};
char* mDMDEnvVar; // a saved copy, for later printing
@ -320,7 +319,6 @@ public:
void SetSampleBelowSize(size_t aN) { mSampleBelowSize.mActual = aN; }
bool IsTestMode() const { return mMode == Test; }
bool IsStressMode() const { return mMode == Stress; }
};
static Options *gOptions;
@ -1320,8 +1318,6 @@ Options::Options(const char* aDMDEnvVar)
mMode = Options::Normal;
} else if (strcmp(arg, "--mode=test") == 0) {
mMode = Options::Test;
} else if (strcmp(arg, "--mode=stress") == 0) {
mMode = Options::Stress;
} else if (strcmp(arg, "") == 0) {
// This can only happen if there is trailing whitespace. Ignore.
@ -1358,7 +1354,7 @@ Options::BadArg(const char* aArg)
int(mMaxFrames.mMax),
int(mMaxFrames.mDefault));
StatusMsg(" --show-dump-stats=<yes|no> Show stats about dumps? [no]\n");
StatusMsg(" --mode=<normal|test|stress> Mode of operation [normal]\n");
StatusMsg(" --mode=<normal|test> Mode of operation [normal]\n");
StatusMsg("\n");
exit(1);
}
@ -1389,7 +1385,6 @@ OpenOutputFile(const char* aFilename)
static void RunTestMode(UniquePtr<FpWriteFunc> aF1, UniquePtr<FpWriteFunc> aF2,
UniquePtr<FpWriteFunc> aF3, UniquePtr<FpWriteFunc> aF4);
static void RunStressMode(UniquePtr<FpWriteFunc> aF);
// WARNING: this function runs *very* early -- before all static initializers
// have run. For this reason, non-scalar globals such as gStateLock and
@ -1462,16 +1457,6 @@ Init(const malloc_table_t* aMallocTable)
exit(0);
}
if (gOptions->IsStressMode()) {
auto f = MakeUnique<FpWriteFunc>(OpenOutputFile("stress.json"));
gIsDMDRunning = true;
StatusMsg("running stress mode...\n");
RunStressMode(Move(f));
StatusMsg("finished stress mode\n");
exit(0);
}
gIsDMDRunning = true;
}
@ -2088,81 +2073,5 @@ RunTestMode(UniquePtr<FpWriteFunc> aF1, UniquePtr<FpWriteFunc> aF2,
AnalyzeReports(writer4);
}
//---------------------------------------------------------------------------
// Stress testing microbenchmark
//---------------------------------------------------------------------------
// This stops otherwise-unused variables from being optimized away.
static void
UseItOrLoseIt2(void* a)
{
if (a == (void*)0x42) {
printf("UseItOrLoseIt2\n");
}
}
MOZ_NEVER_INLINE static void
stress5()
{
for (int i = 0; i < 10; i++) {
void* x = malloc(64);
UseItOrLoseIt2(x);
if (i & 1) {
free(x);
}
}
}
MOZ_NEVER_INLINE static void
stress4()
{
stress5(); stress5(); stress5(); stress5(); stress5();
stress5(); stress5(); stress5(); stress5(); stress5();
}
MOZ_NEVER_INLINE static void
stress3()
{
for (int i = 0; i < 10; i++) {
stress4();
}
}
MOZ_NEVER_INLINE static void
stress2()
{
stress3(); stress3(); stress3(); stress3(); stress3();
stress3(); stress3(); stress3(); stress3(); stress3();
}
MOZ_NEVER_INLINE static void
stress1()
{
for (int i = 0; i < 10; i++) {
stress2();
}
}
// This stress test does lots of allocations and frees, which is where most of
// DMD's overhead occurs. It allocates 1,000,000 64-byte blocks, spread evenly
// across 1,000 distinct stack traces. It frees every second one immediately
// after allocating it.
//
// It's highly artificial, but it's deterministic and easy to run. It can be
// timed under different conditions to glean performance data.
static void
RunStressMode(UniquePtr<FpWriteFunc> aF)
{
JSONWriter writer(Move(aF));
// Disable sampling for maximum stress.
gOptions->SetSampleBelowSize(1);
stress1(); stress1(); stress1(); stress1(); stress1();
stress1(); stress1(); stress1(); stress1(); stress1();
AnalyzeReports(writer);
}
} // namespace dmd
} // namespace mozilla