I am running Ubuntu 11.10 64bit on x86_64 machine with 4 core and hyperthreading enabled. I am using the following commands in order to get per-thread performance characteristics of a multi-threaded application. "perf record -s -e cycles,instructions,cache-references,cache- misses,branches,branch-misses /PATH/TO/APPLICATION". "perf report -T -- stdio".
I get invalid results randomly. In the result, I get invalid (negative) process id or very big counter values. I am giving an example output: # (For a higher level overview, try: perf report --sort comm,dso) # # PID TID cycles cycles instructions instructions instructions instructions instructions instructions instructions instructions cache-references cache-references cache-references cache-references cache-references cache-references cache-references cache-references cache-misses cache-misses cache-misses cache-misses cache-misses cache-misses cache-misses cache-misses branches branches branches branches branches branches branches branches branch-misses branch-misses branch-misses branch-misses branch-misses branch-misses branch-misses branch-misses cycles cycles cycles cycles cycles cycles 4487 4493 0 0 0 0 7494102348578251111 3488601301391995001 41541 37571 0 0 0 0 7092150592960751218 7810209763779608678 1611 2111 0 7381246349212319846 0 0 7018136542324422001 28838465189274226 36 28 0 0 0 0 8026367814273625705 7453295080785733747 7380943991784800358 7228 0 0 0 0 28825271049347427 28825292623798627 28825270915195235 434 0 0 0 0 8462108034846451316 85567 94053 98435 ... You can see invalid values such as 8026367814273625705. How can I fix this problem and get correct per-thread performance counters? Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
