[compiler-rt] r214029 - tsan: improve shadow flush benchmark
Dmitry Vyukov
dvyukov at google.com
Sat Jul 26 09:40:34 PDT 2014
Author: dvyukov
Date: Sat Jul 26 11:40:33 2014
New Revision: 214029
URL: http://llvm.org/viewvc/llvm-project?rev=214029&view=rev
Log:
tsan: improve shadow flush benchmark
allow to specify access stride
Modified:
compiler-rt/trunk/test/tsan/bench_shadow_flush.cc
Modified: compiler-rt/trunk/test/tsan/bench_shadow_flush.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/test/tsan/bench_shadow_flush.cc?rev=214029&r1=214028&r2=214029&view=diff
==============================================================================
--- compiler-rt/trunk/test/tsan/bench_shadow_flush.cc (original)
+++ compiler-rt/trunk/test/tsan/bench_shadow_flush.cc Sat Jul 26 11:40:33 2014
@@ -11,6 +11,7 @@
const long kSmallPage = 4 << 10;
const long kLargePage = 2 << 20;
+const long kStride = 1 << 10;
typedef unsigned long uptr;
@@ -24,15 +25,20 @@ int main(int argc, const char **argv) {
int niter = 1;
if (argc > 3)
niter = atoi(argv[3]);
+ int stride2 = 1;
+ if (argc > 4)
+ stride2 = atoi(argv[4]);
- void *p = mmap(0, mem_size + kLargePage, PROT_READ | PROT_WRITE,
- MAP_ANON | MAP_PRIVATE, -1, 0);
+ uptr sz = mem_size + stride2 * kStride + kLargePage;
+ void *p = mmap(0, sz, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
uptr a = ((uptr)p + kLargePage - 1) & ~(kLargePage - 1);
volatile char *mem = (volatile char *)a;
for (int i = 0; i < niter; i++) {
- for (uptr off = 0; off < mem_size; off += stride)
- mem[off] = 42;
+ for (uptr off = 0; off < mem_size; off += stride) {
+ for (uptr off2 = 0; off2 < stride2; off2++)
+ mem[off + off2 * kStride] = 42;
+ }
}
fprintf(stderr, "DONE\n");
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