Hi there,
I have seen this behaviour due to an issue in the design of access log
buffer flushing. During a buffer flush all other threads are delayed,
which can cause this spike.
You can confirm this by changing your access log buffer size up or
down.
Sadly this problem is not simply fixed without a complete rewrite of
the logging subsystem - which I would love to do, but I am not employed
to work on 389 at this time so I lack the time.
Hope that helps.
On Wed, 2018-09-05 at 21:14 +0000, Ghiurea, Isabella wrote:
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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