btorpey / clocks Goto Github PK
View Code? Open in Web Editor NEWCode to test various clocks
Code to test various clocks
The code does a bit-wise AND with 255 of the iteration step to find the location where to store the sample; this obviously only works if the number of buckets is 255, and usually leads to crazy results or crashes otherwise.
The fix is trivial - do a modulo operation instead. Code diff below:
diff --git a/ClockBench.cpp b/ClockBench.cpp
index 8b73921..680e641 100755
--- a/ClockBench.cpp
+++ b/ClockBench.cpp
@@ -168,7 +168,7 @@ int main(int argc, char** argv)
{
for (int i = 0; i < ITERS * BUCKETS; ++i) {
- int n = i & 0xff;
+ int n = i % BUCKETS;
timestamp[n] = cpuid_rdtsc();
}
for (int i = 0; i < BUCKETS; ++i) {
@@ -183,7 +183,7 @@ int main(int argc, char** argv)
#ifdef RDTSCP
{
for (int i = 0; i < ITERS * BUCKETS; ++i) {
- int n = i & 0xff;
+ int n = i % BUCKETS;
timestamp[n] = rdtscp();
}
for (int i = 0; i < BUCKETS; ++i) {
@@ -193,11 +193,11 @@ int main(int argc, char** argv)
x.print();
x.dump(file);
}
- #endif
+ #endif
{
for (int i = 0; i < ITERS * BUCKETS; ++i) {
- int n = i & 0xff;
+ int n = i % BUCKETS;
timestamp[n] = rdtsc();
}
for (int i = 0; i < BUCKETS; ++i) {
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