A more detailed discussion about it:
http://www.port389.org/docs/389ds/design/logging-performance-improvement....
You could also disable logging and see whether the spikes disappear to be sure of their
source:
http://www.port389.org/docs/389ds/howto/howto-logsystemperf.html
Hi,
it could be flushing of logs (access.log) on disk which happens more
often when
server load is higher. you could use iostat or dstat to see what happens
Regards,
Andrey
> De: "Ghiurea, Isabella"
<Isabella.Ghiurea(a)nrc-cnrc.gc.ca>
> À: 389-users(a)lists.fedoraproject.org
> Envoyé: Mercredi 5 Septembre 2018 23:14:24
> Objet: [389-users] ldap perfomance
> Hello Gurus,
> looking for an answer to the following performance behavior
> my env: 389-ds-base-1.3.5.15-1.fc24.x86_64 in multimaster fractional replication
> running rsearch for 5 min with 1 thread seeing spikes for a basic
read using
> index uid
> And running with 10 threads same search the avg ms/ops
performance are much
> better with no major spike/burst
> Any explanation much appreciate it
> see bellow for 1 thread and the spike/burst
> T 300 -t 1
> rsearch: 1 threads launched.
> T1 min= 0ms, max= 5ms, count = 54710
> T1 min= 0ms, max= 42ms, count = 64930
> T1 min= 0ms, max= 2ms, count = 65174
> T1 min= 0ms, max= 2ms, count = 65110
> T1 min= 0ms, max= 44ms, count = 64966
> T1 min= 0ms, max= 1ms, count = 65101
> T1 min= 0ms, max= 22ms, count = 65056
> T1 min= 0ms, max= 32ms, count = 64981
> T1 min= 0ms, max= 1ms, count = 65145
> T1 min= 0ms, max= 1ms, count = 65223
> T1 min= 0ms, max= 27ms, count = 65015
> T1 min= 0ms, max= 1ms, count = 65182
> T1 min= 0ms, max= 3ms, count = 65213
> T1 min= 0ms, max= 23ms, count = 64760
> T1 min= 0ms, max= 2ms, count = 64214
> T1 min= 0ms, max= 3ms, count = 52279
> T1 min= 0ms, max= 11ms, count = 64914
> T1 min= 0ms, max= 1ms, count = 65118
> T1 min= 0ms, max= 5ms, count = 64852
> T1 min= 0ms, max= 91ms, count = 64180
> T1 min= 0ms, max= 4ms, count = 64746
> T1 min= 0ms, max= 1ms, count = 65080
> T1 min= 0ms, max= 12ms, count = 65110
> T1 min= 0ms, max= 702ms, count = 59243
> T1 min= 0ms, max= 1ms, count = 65082
> T1 min= 0ms, max= 89ms, count = 64331
> T1 min= 0ms, max= 23ms, count = 64647
> T1 min= 0ms, max= 5ms, count = 64818
> T1 min= 0ms, max= 55ms, count = 64374
> T1 min= 0ms, max= 8ms, count = 64713
> T1 min= 0ms, max= 8ms, count = 64713
> 300 sec >= 300
> Final Average rate: 6394.22/sec = 0.1564msec/op, total: 64713
> And final avg rate for 10 threads, no significant spike/burst for
this num of
> threads
> 20180905 14:07:23 - Rate: 16962.10/thr (16962.10/sec =
0.0590ms/op),
> total:169621 (10 thr)
> 300 sec >= 300
> Final Average rate: 17420.40/sec = 0.0574msec/op, total:169621
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