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added trivial malloc fast-path benchmark 

While this is not good representation of real-world production malloc
behavior, it is representative of length (instruction-wise and well as
cycle-wise) of fast-path. So this is better than nothing.
This commit is contained in:
Aliaksey Kandratsenka 2015-05-03 12:55:47 -07:00
parent e1d1311cfb
commit 64e0133901
3 changed files with 111 additions and 0 deletions
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6
.gitignore vendored
View File

@ -19,6 +19,8 @@
/atomicops_unittest
/atomicops_unittest.exe
/autom4te.cache/
/benchmark/.deps
/benchmark/.dirstamp
/compile
/config.guess
/config.log
@ -59,6 +61,10 @@
/m4/ltsugar.m4
/m4/ltversion.m4
/m4/lt~obsolete.m4
/malloc_bench
/malloc_bench.exe
/malloc_bench_shared
/malloc_bench_shared.exe
/malloc_extension_c_test
/malloc_extension_debug_test
/malloc_extension_test

12
Makefile.am
View File

@ -847,6 +847,18 @@ endif WITH_STACK_TRACE
endif WITH_DEBUGALLOC
noinst_PROGRAMS += malloc_bench malloc_bench_shared
malloc_bench_SOURCES = benchmark/malloc_bench.cc
malloc_bench_CXXFLAGS = $(PTHREAD_CFLAGS) $(AM_CXXFLAGS) $(NO_BUILTIN_CXXFLAGS)
malloc_bench_LDFLAGS = $(PTHREAD_CFLAGS) $(TCMALLOC_FLAGS) -static
malloc_bench_LDADD = libtcmalloc_minimal.la $(PTHREAD_LIBS)
malloc_bench_shared_SOURCES = benchmark/malloc_bench.cc
malloc_bench_shared_CXXFLAGS = $(PTHREAD_CFLAGS) $(AM_CXXFLAGS) $(NO_BUILTIN_CXXFLAGS)
malloc_bench_shared_LDFLAGS = $(PTHREAD_CFLAGS) $(TCMALLOC_FLAGS)
malloc_bench_shared_LDADD = libtcmalloc_minimal.la $(PTHREAD_LIBS)
### ------- tcmalloc (thread-caching malloc + heap profiler + heap checker)

93
benchmark/malloc_bench.cc Normal file
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@ -0,0 +1,93 @@
#include <stdlib.h>
#include <stdio.h>
int main(void)
{
long long i = 1LL<<(28-4);
size_t sz = 32;
printf("i = %lld\n", i);
for (;i>0;i--) {
void *p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
p = malloc(sz);
if (!p) {
abort();
}
free(p);
sz = ((sz | reinterpret_cast<size_t>(p)) & 511) + 16;
}
return 0;
}