Commit 7c338aeb authored by Philip Carns's avatar Philip Carns

update darshan util documentation to reflect new darshan-parser --perf

output


git-svn-id: https://svn.mcs.anl.gov/repos/darshan/trunk@857 3b7491f3-a168-0410-bf4b-c445ed680a29
parent 6e36c312
......@@ -310,33 +310,34 @@ each file:
Use the '--perf' option to get performance approximations using four
different computations.
* agg_perf_by_slowest:
Uses the slowest time over all ranks (most accurate but requires newer log
version)
* agg_perf_by_cumul: Sums time counters and divides by nprocs
(inaccurate if lots of variance between procs)
* agg_perf_by_open: The difference between timestamp of open and
close (inaccurate if file is left open without i/o happening)
* agg_perf_by_open_lastio: The difference between timestamp of open and
the timestamp of last i/o
(similar to above but fixes case where file is left open after io is
complete)
.Example output
----
# performance
# -----------
# total_bytes: 4260544914638
# slowest_rank_time: 100.615304
# slowest_rank_meta_time: 85.642247
# shared_time_by_cumul: 55.306259
# shared_time_by_open: 65.125876
# shared_time_by_open_lastio: 65.027973
# shared_meta_time: 3.002117
# agg_perf_by_cumul: 26059.078568
# agg_perf_by_open: 24515.164431
# agg_perf_by_open_lastio: 24529.654039
# agg_perf_by_slowest: 26049.207180
# total_bytes: 134217728
#
# I/O timing for unique files (seconds):
# ...........................
# unique files: slowest_rank_time: 0.000000
# unique files: slowest_rank_meta_time: 0.000000
#
# I/O timing for shared files (seconds):
# (multiple estimates shown; time_by_slowest is generally the most accurate)
# ...........................
# shared files: time_by_cumul_io_only: 0.042264
# shared files: time_by_cumul_meta_only: 0.000325
# shared files: time_by_open: 0.064986
# shared files: time_by_open_lastio: 0.064966
# shared files: time_by_slowest: 0.057998
#
# Aggregate performance, including both shared and unique files (MiB/s):
# (multiple estimates shown; agg_perf_by_slowest is generally the most
# accurate)
# ...........................
# agg_perf_by_cumul: 3028.570529
# agg_perf_by_open: 1969.648064
# agg_perf_by_open_lastio: 1970.255248
# agg_perf_by_slowest: 2206.983935
----
===== Files
......
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