netsniff-ng.git - A high-performance Linux networking toolkit

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-4.70% 0.94% 5 13.09 +-4.74% 13.52 +-3.73% -3.28% 8 13.79 +-5.61% 12.90 +-3.27% 6.45% 12 11.57 +-2.44% 8.71 +-1.40% 24.72% 21 12.39 +-3.92% 9.97 +-1.84% 19.53% 30 13.91 +-2.53% 11.73 +-2.28% 15.67% 48 13.71 +-1.59% 12.32 +-1.97% 10.14% 79 14.44 +-0.66% 13.40 +-1.06% 7.20% 110 15.86 +-0.50% 14.46 +-0.59% 8.83% 128 16.51 +-0.32% 15.06 +-0.78% 8.78% As a final note, the following shows the evolution of performance figures in the "poundtime" benchmark and pinpoints commit 6e998916dfe3 ("sched/cputime: Fix clock_nanosleep()/clock_gettime() inconsistency") as a major source of degradation, mostly unaddressed to this day (figures expressed in seconds). pound_clock_gettime: threads parent of 6e998916dfe3 4.7-rc7 6e998916dfe3 itself 2 2.23 3.68 ( -64.56%) 3.48 (-55.48%) 5 2.83 3.78 ( -33.42%) 3.33 (-17.43%) 8 2.84 4.31 ( -52.12%) 3.37 (-18.76%) 12 3.09 3.61 ( -16.74%) 3.32 ( -7.17%) 21 3.14 4.63 ( -47.36%) 4.01 (-27.71%) 30 3.28 5.75 ( -75.37%) 3.63 (-10.80%) 48 3.02 6.05 (-100.56%) 3.71 (-22.99%) 79 2.88 6.30 (-118.90%) 3.75 (-30.26%) 110 2.95 6.46 (-119.00%) 3.81 (-29.24%) 128 3.05 6.42 (-110.08%) 3.88 (-27.04%) pound_times: threads parent of 6e998916dfe3 4.7-rc7 6e998916dfe3 itself 2 2.27 3.73 ( -64.71%) 3.65 (-61.14%) 5 2.78 3.77 ( -35.56%) 3.45 (-23.98%) 8 2.79 4.41 ( -57.71%) 3.52 (-26.05%) 12 3.02 3.56 ( -17.94%) 3.29 ( -9.08%) 21 3.10 4.61 ( -48.74%) 4.07 (-31.34%) 30 3.33 5.75 ( -72.53%) 3.87 (-16.01%) 48 2.96 6.06 (-105.04%) 3.79 (-28.10%) 79 2.88 6.24 (-116.83%) 3.88 (-34.81%) 110 2.98 6.37 (-114.08%) 3.90 (-31.12%) 128 3.10 6.35 (-104.61%) 4.00 (-28.87%) The source code of the two benchmarks follows. To compile the two: NR_THREADS=42 for FILE in pound_times pound_clock_gettime; do gcc -lrt -O2 -lpthread -DNUM_THREADS=$NR_THREADS $FILE.c -o $FILE done ==== BEGIN pound_times.c ==== struct tms start; void *pound (void *threadid) { struct tms end; int oldutime = 0; int utime; int i; for (i = 0; i < 5000000 / NUM_THREADS; i++) { times(&end); utime = ((int)end.tms_utime - (int)start.tms_utime); if (oldutime > utime) { printf("utime decreased, was %d, now %d!\n", oldutime, utime); } oldutime = utime; } pthread_exit(NULL); } int main() { pthread_t th[NUM_THREADS]; long i; times(&start); for (i = 0; i < NUM_THREADS; i++) { pthread_create (&th[i], NULL, pound, (void *)i); } pthread_exit(NULL); return 0; } ==== END pound_times.c ==== ==== BEGIN pound_clock_gettime.c ==== void *pound (void *threadid) { struct timespec ts; int rc, i; unsigned long prev = 0, this = 0; for (i = 0; i < 5000000 / NUM_THREADS; i++) { rc = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts); if (rc < 0) perror("clock_gettime"); this = (ts.tv_sec * 1000000000) + ts.tv_nsec; if (0 && this < prev) printf("%lu ns timewarp at iteration %d\n", prev - this, i); prev = this; } pthread_exit(NULL); } int main() { pthread_t th[NUM_THREADS]; long rc, i; pid_t pgid; for (i = 0; i < NUM_THREADS; i++) { rc = pthread_create(&th[i], NULL, pound, (void *)i); if (rc < 0) perror("pthread_create"); } pthread_exit(NULL); return 0; } ==== END pound_clock_gettime.c ==== Suggested-by: Mike Galbraith Signed-off-by: Giovanni Gherdovich Signed-off-by: Peter Zijlstra (Intel) Cc: Linus Torvalds Cc: Mel Gorman Cc: Peter Zijlstra Cc: Stanislaw Gruszka Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/1470385316-15027-2-git-send-email-ggherdovich@suse.cz Signed-off-by: Ingo Molnar ---


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