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OpenZFS 9076 - Adjust perf test concurrency settings

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ZFS Performance test concurrency should be lowered for better latency

Work by Stephen Blinick.

Nightly performance runs typically consist of two levels of concurrency;
and both are fairly high.

Since the IO runs are to a ZFS filesystem, within a zpool, which is
based on some variable number of vdev's, the amount of IO driven to each
device is variable. Additionally, different device types (HDD vs SSD,
etc) can generally handle a different amount of concurrent IO before
saturating.

Nevertheless, in practice, it appears that most tests are well past the
concurrency saturation point and therefore both perform with the same
throughput, the maximum of the device. Because the queuedepth to the
device(s) is so high however, the latency is much higher than the best
possible at that throughput, and increases linearly with the increase in
concurrency.

This means that changes in code that impact latency during normal
operation (before saturation) may not be apparent when a large component
of the measured latency is from the IO sitting in a queue to be
serviced. Therefore, changing the concurrency settings is recommended

Authored by: Stephen Blinick <stephen.blinick@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: John Wren Kennedy <jwk404@gmail.com>
Ported-by: John Wren Kennedy <jwk404@gmail.com>

OpenZFS-issue: https://www.illumos.org/issues/9076
OpenZFS-commit: https://github.com/openzfs/openzfs/pull/562
Upstream bug: DLPX-45477
Closes #7302
This commit is contained in:
Stephen Blinick 2018-02-11 16:11:59 -07:00 committed by Brian Behlendorf
parent 1a2342784a
commit 8a2a9db8df
5 changed files with 55 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
tests/zfs-tests/tests/perf/regression/random_reads.ksh
View File

@ -25,6 +25,15 @@
# for all fio runs. The ARC is cleared with `zinject -a` prior to each run
# so reads will go to disk.
#
# Thread/Concurrency settings:
# PERF_NTHREADS defines the number of files created in the test filesystem,
# as well as the number of threads that will simultaneously drive IO to
# those files. The settings chosen are from measurements in the
# PerfAutoESX/ZFSPerfESX Environments, selected at concurrency levels that
# are at peak throughput but lowest latency. Higher concurrency introduces
# queue time latency and would reduce the impact of code-induced performance
# regressions.
#
. $STF_SUITE/include/libtest.shlib
. $STF_SUITE/tests/perf/perf.shlib
@ -54,13 +63,13 @@ export TOTAL_SIZE=$(($(get_prop avail $TESTFS) * 3 / 2))
if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
export PERF_NTHREADS=${PERF_NTHREADS:-'8 16 64'}
export PERF_NTHREADS=${PERF_NTHREADS:-'8 16 32 64'}
export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
export PERF_IOSIZES=${PERF_IOSIZES:-'8k'}
elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
export PERF_NTHREADS=${PERF_NTHREADS:-'64 128'}
export PERF_NTHREADS=${PERF_NTHREADS:-'16 32'}
export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
export PERF_IOSIZES=${PERF_IOSIZES:-'8k'}
fi

13
tests/zfs-tests/tests/perf/regression/random_readwrite.ksh
View File

@ -25,6 +25,15 @@
# and used for all fio runs. The ARC is cleared with `zinject -a` prior to
# each run so reads will go to disk.
#
# Thread/Concurrency settings:
# PERF_NTHREADS defines the number of files created in the test filesystem,
# as well as the number of threads that will simultaneously drive IO to
# those files. The settings chosen are from measurements in the
# PerfAutoESX/ZFSPerfESX Environments, selected at concurrency levels that
# are at peak throughput but lowest latency. Higher concurrency introduces
# queue time latency and would reduce the impact of code-induced performance
# regressions.
#
. $STF_SUITE/include/libtest.shlib
. $STF_SUITE/tests/perf/perf.shlib
@ -54,13 +63,13 @@ export TOTAL_SIZE=$(($(get_prop avail $TESTFS) * 3 / 2))
if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
export PERF_NTHREADS=${PERF_NTHREADS:-'8 16 64'}
export PERF_NTHREADS=${PERF_NTHREADS:-'4 8 16 64'}
export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'0 1'}
export PERF_IOSIZES='' # bssplit used instead
elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
export PERF_NTHREADS=${PERF_NTHREADS:-'64 128'}
export PERF_NTHREADS=${PERF_NTHREADS:-'32 64'}
export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
export PERF_IOSIZES='' # bssplit used instead
fi

13
tests/zfs-tests/tests/perf/regression/random_writes.ksh
View File

@ -24,6 +24,15 @@
# Prior to each fio run the dataset is recreated, and fio writes new files
# into an otherwise empty pool.
#
# Thread/Concurrency settings:
# PERF_NTHREADS defines the number of files created in the test filesystem,
# as well as the number of threads that will simultaneously drive IO to
# those files. The settings chosen are from measurements in the
# PerfAutoESX/ZFSPerfESX Environments, selected at concurrency levels that
# are at peak throughput but lowest latency. Higher concurrency introduces
# queue time latency and would reduce the impact of code-induced performance
# regressions.
#
. $STF_SUITE/include/libtest.shlib
. $STF_SUITE/tests/perf/perf.shlib
@ -53,13 +62,13 @@ export TOTAL_SIZE=$(($(get_prop avail $TESTFS) * 3 / 2))
if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
export PERF_NTHREADS=${PERF_NTHREADS:-'8 16 64'}
export PERF_NTHREADS=${PERF_NTHREADS:-'1 4 8 16 32 64 128'}
export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'0 1'}
export PERF_IOSIZES=${PERF_IOSIZES:-'8k'}
elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
export PERF_NTHREADS=${PERF_NTHREADS:-'64 128'}
export PERF_NTHREADS=${PERF_NTHREADS:-'32 128'}
export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
export PERF_IOSIZES=${PERF_IOSIZES:-'8k'}
fi

13
tests/zfs-tests/tests/perf/regression/sequential_reads.ksh
View File

@ -25,6 +25,15 @@
# for all fio runs. The ARC is cleared with `zinject -a` prior to each run
# so reads will go to disk.
#
# Thread/Concurrency settings:
# PERF_NTHREADS defines the number of files created in the test filesystem,
# as well as the number of threads that will simultaneously drive IO to
# those files. The settings chosen are from measurements in the
# PerfAutoESX/ZFSPerfESX Environments, selected at concurrency levels that
# are at peak throughput but lowest latency. Higher concurrency introduces
# queue time latency and would reduce the impact of code-induced performance
# regressions.
#
. $STF_SUITE/include/libtest.shlib
. $STF_SUITE/tests/perf/perf.shlib
@ -54,13 +63,13 @@ export TOTAL_SIZE=$(($(get_prop avail $TESTFS) * 3 / 2))
if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
export PERF_NTHREADS=${PERF_NTHREADS:-'16 64'}
export PERF_NTHREADS=${PERF_NTHREADS:-'8 16 32 64'}
export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
export PERF_IOSIZES=${PERF_IOSIZES:-'64k 128k 1m'}
elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
export PERF_NTHREADS=${PERF_NTHREADS:-'64 128'}
export PERF_NTHREADS=${PERF_NTHREADS:-'8 16'}
export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
export PERF_IOSIZES=${PERF_IOSIZES:-'128k 1m'}
fi

13
tests/zfs-tests/tests/perf/regression/sequential_writes.ksh
View File

@ -24,6 +24,15 @@
# Prior to each fio run the dataset is recreated, and fio writes new files
# into an otherwise empty pool.
#
# Thread/Concurrency settings:
# PERF_NTHREADS defines the number of files created in the test filesystem,
# as well as the number of threads that will simultaneously drive IO to
# those files. The settings chosen are from measurements in the
# PerfAutoESX/ZFSPerfESX Environments, selected at concurrency levels that
# are at peak throughput but lowest latency. Higher concurrency introduces
# queue time latency and would reduce the impact of code-induced performance
# regressions.
#
. $STF_SUITE/include/libtest.shlib
. $STF_SUITE/tests/perf/perf.shlib
@ -53,13 +62,13 @@ export TOTAL_SIZE=$(($(get_prop avail $TESTFS) * 3 / 2))
if [[ -n $PERF_REGRESSION_WEEKLY ]]; then
export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_WEEKLY}
export PERF_RUNTYPE=${PERF_RUNTYPE:-'weekly'}
export PERF_NTHREADS=${PERF_NTHREADS:-'8 16'}
export PERF_NTHREADS=${PERF_NTHREADS:-'1 4 8 16 32 64 128'}
export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'0 1'}
export PERF_IOSIZES=${PERF_IOSIZES:-'8k 128k 1m'}
elif [[ -n $PERF_REGRESSION_NIGHTLY ]]; then
export PERF_RUNTIME=${PERF_RUNTIME:-$PERF_RUNTIME_NIGHTLY}
export PERF_RUNTYPE=${PERF_RUNTYPE:-'nightly'}
export PERF_NTHREADS=${PERF_NTHREADS:-'64 128'}
export PERF_NTHREADS=${PERF_NTHREADS:-'16 32'}
export PERF_SYNC_TYPES=${PERF_SYNC_TYPES:-'1'}
export PERF_IOSIZES=${PERF_IOSIZES:-'8k 128k 1m'}
fi