diff options
| author | Richard Wareing <rwareing@fb.com> | 2016-04-06 17:06:43 -0700 |
|---|---|---|
| committer | Amar Tumballi <amarts@redhat.com> | 2017-12-09 04:04:44 +0000 |
| commit | aeff5def7e11de418d55f996926cbd5818c0494d (patch) | |
| tree | 5d8266ea1d205a28174c63fe69842944e58fcaea /xlators/debug/io-stats | |
| parent | 52915ee818e8a6d0f052d8a2deeadd8ff7bd85dc (diff) | |
debug/io-stats: Adding stat for weighted & unweighted average latency
Summary:
- Our current approach to measuring "average fop latency" is badly
flawed in that it doesn't weight the FOPs correctly according to how
many occurred in the time interval. This makes Statisticians very
sad. This patch adds an internally computed weighted average
latency which will be far more efficient to display via ODS, as well
as having the benefit of not being complete nonsense.
Reviewers: kvigor, dph, sshreyas
Reviewed By: sshreyas
Change-Id: Ie3618f279b545610b7ed1a8482243fcc8dc53217
BUG: 1523353
Reviewed-on: https://review.gluster.org/18192
Reviewed-by: Shreyas Siravara <sshreyas@fb.com>
Smoke: Gluster Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Signed-off-by: Ana M. Neri <amnerip@fb.com>
Diffstat (limited to 'xlators/debug/io-stats')
| -rw-r--r-- | xlators/debug/io-stats/src/io-stats.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/xlators/debug/io-stats/src/io-stats.c b/xlators/debug/io-stats/src/io-stats.c index 266f9449c9e..c0cd0e2477b 100644 --- a/xlators/debug/io-stats/src/io-stats.c +++ b/xlators/debug/io-stats/src/io-stats.c @@ -798,6 +798,11 @@ io_stats_dump_global_to_json_logfp (xlator_t *this, float fop_lat_min; float fop_lat_max; double interval_sec; + double fop_ave_usec = 0.0; + double fop_ave_usec_sum = 0.0; + double weighted_fop_ave_usec = 0.0; + double weighted_fop_ave_usec_sum = 0.0; + long total_fop_hits = 0; interval_sec = ((now->tv_sec * 1000000.0 + now->tv_usec) - (stats->started_at.tv_sec * 1000000.0 + @@ -902,7 +907,34 @@ io_stats_dump_global_to_json_logfp (xlator_t *this, ios_log (this, logfp, "\"%s.%s.fop.%s.latency_max_usec\": \"%0.2lf\",", key_prefix, str_prefix, lc_fop_name, fop_lat_max); + + fop_ave_usec_sum += fop_lat_ave; + weighted_fop_ave_usec_sum += fop_hits * fop_lat_ave; + total_fop_hits += fop_hits; + } + + if (total_fop_hits) { + weighted_fop_ave_usec = + weighted_fop_ave_usec_sum/total_fop_hits; + /* Extra key that does not print out an entry w/ 0.00 for + * intervals with no data + */ + ios_log (this, logfp, + "\"%s.%s.fop.weighted_latency_ave_usec_nozerofill\": " + "\"%0.4lf\",", + key_prefix, str_prefix, weighted_fop_ave_usec); } + ios_log (this, logfp, + "\"%s.%s.fop.weighted_latency_ave_usec\": \"%0.4lf\",", + key_prefix, str_prefix, weighted_fop_ave_usec); + ios_log (this, logfp, + "\"%s.%s.fop.weighted_fop_count\": \"%ld\",", + key_prefix, str_prefix, total_fop_hits); + + fop_ave_usec = fop_ave_usec_sum/GF_FOP_MAXVALUE; + ios_log (this, logfp, + "\"%s.%s.fop.unweighted_latency_ave_usec\":\"%0.4lf\",", + key_prefix, str_prefix, fop_ave_usec); for (i = 0; i < GF_UPCALL_FLAGS_MAXVALUE; i++) { lc_fop_name = strdupa (gf_upcall_list[i]); |