lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 12 Nov 2009 20:03:11 -0200 From: Lucas De Marchi <lucas.de.marchi@...il.com> To: Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Arnaldo Carvalho de Melo <acme@...hat.com> Cc: linux-kernel@...r.kernel.org Subject: perf stat output Hi all! Some questions about perf stat output. See example: lucas@...-linux:~/programming/testprograms> perf stat -e L1-dcache-loads -e L1-dcache-load-misses -- make -j gcc test_schedchanges.c -o test_schedchanges gcc -pthread test_taskaff1.c -o test_taskaff1 gcc -pthread test_taskaff2.c -o test_taskaff2 gcc -pthread test_taskaff3.c -o test_taskaff3 Performance counter stats for 'make -j': 161384667 L1-dcache-loads # 0.000 M/sec 24853791 L1-dcache-load-misses # 0.000 M/sec 0.066893389 seconds time elapsed Why do we have both L1-dcache-loads and L1-dcache-load-misses with 0.000 M/sec? Also, why do we have 0 M/s when running "perf stat -a -e cache-misses -e cache-references" but values different than 0 when running "perf stat -a" without selecting the events? The last question: what does the "scaled from X%" mean? Is it related to the maximum number of performance registers a processor can count at a time? Thanks Lucas De Marchi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists