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HDB compared with LMDB
We're currently using OpenLDAP 2.4.38 on our production server using
HDB as the database type. I wanted to upgrade to the latest version
and take advantage of LMDB as the database type so I've built a second
server and transferred the data.
Before making that server the production server, we're running
performance comparisons, using ldclt[1] as a stress test tool.
I don't know if anyone else has got any experience of using this tool;
the output we're getting when running the tool doesn't show
significant differences in performance, but I'm not sure if it is just
the test type we're running or the fact that, actually, we shouldn't
be expecting significant differences ...
I've included the output below. I've removed the details of our
servers from the command line.
Can someone who has made a transition from HDB to LMDB give an
indication of whether or not we should see a performance difference on
LDAP queries and, if yes, by what sort of factor?
If you are familiar with ldclt, should we be running different tests
to get a better insight into how the two servers compare?
Thanks.
Philip
[1] http://docs.oracle.com/cd/E19957-01/816-6400-10/ldclt.html
2.4.38 with HDB:
ldclt -f uid=testXXXXX -e esearch,random -r0 -R99999 -I 32
ldclt version 4.23
ldclt[1979]: Starting at Thu Sep 17 11:28:51 2015
ldclt[1979]: Average rate: 109.70/thr ( 109.70/sec), total: 1097
ldclt[1979]: Average rate: 114.80/thr ( 114.80/sec), total: 1148
ldclt[1979]: Average rate: 115.00/thr ( 115.00/sec), total: 1150
ldclt[1979]: Average rate: 111.90/thr ( 111.90/sec), total: 1119
ldclt[1979]: Average rate: 115.20/thr ( 115.20/sec), total: 1152
ldclt[1979]: Average rate: 114.80/thr ( 114.80/sec), total: 1148
ldclt[1979]: Average rate: 113.70/thr ( 113.70/sec), total: 1137
ldclt[1979]: Average rate: 111.20/thr ( 111.20/sec), total: 1112
ldclt[1979]: Average rate: 114.80/thr ( 114.80/sec), total: 1148
ldclt[1979]: Global average rate: 1021.10/thr (113.46/sec), total: 10211
2.4.41 with MDB:
ldclt -f uid=testXXXXX -e esearch,random -r0 -R99999 -I 32
ldclt version 4.23
ldclt[1967]: Starting at Thu Sep 17 11:26:55 2015
ldclt[1967]: Average rate: 109.70/thr ( 109.70/sec), total: 1097
ldclt[1967]: Average rate: 111.00/thr ( 111.00/sec), total: 1110
ldclt[1967]: Average rate: 112.20/thr ( 112.20/sec), total: 1122
ldclt[1967]: Average rate: 113.00/thr ( 113.00/sec), total: 1130
ldclt[1967]: Average rate: 112.70/thr ( 112.70/sec), total: 1127
ldclt[1967]: Average rate: 112.50/thr ( 112.50/sec), total: 1125
ldclt[1967]: Average rate: 113.00/thr ( 113.00/sec), total: 1130
ldclt[1967]: Average rate: 112.80/thr ( 112.80/sec), total: 1128
ldclt[1967]: Average rate: 112.30/thr ( 112.30/sec), total: 1123
ldclt[1967]: Average rate: 112.90/thr ( 112.90/sec), total: 1129
ldclt[1967]: Global average rate: 1122.10/thr (112.21/sec), total: 11221