Hi all,
I recently decided it was time for some upgrades, so I installed a new
OpenLDAP server with the following changes:
Old
New
os: Ubuntu Hardy Server 32bit FreeBSD 8.0-Release-p2
kernel: 32bit 2.6.24-24-server 32bit 8.0-Release-p2
fs: XFS
UFS (soft-updates)
ldap: 2.3.37 2.4.21
bdb: 4.6.21-6 4.7.25.4
The rest is the same, dual 3.06Ghz P4 Xeon with only 4GB RAM. I'm
using hdb as backend and have about 170k entries in the directory.
Slapd configuration is the same. Oh and I'm only using syncprov overlay.
DB_CONFIG is the same on both machines, only containing this:
set_cachesize 0 268435456 1
set_lg_regionmax 262144
set_lg_bsize 2097152
set_lk_detect DB_LOCK_EXPIRE
On the new server, slapcat is faster, search returning single entry is
slower, but search returning ~10k entries is faster (these are all
second tries so cached data is used):
time ldapsearch filter=(uid=someusername) > /dev/null, returning one
entry on localhost
old (on linux):
real 0m0.006s
user 0m0.000s
sys 0m0.000s
new (on freebsd):
real 0m0.033s
user 0m0.010s
sys 0m0.008s
---
time ldapsearch filter=(uid=a*) > /dev/null, returning ~10k entries on
localhost
old (on linux):
real 0m1.728s
user 0m0.870s
sys 0m0.220s
new (on freebsd):
real 0m0.611s
user 0m0.074s
sys 0m0.015s
---
time slapcat > /dev/null
old (on linux):
real 0m26.834s
user 0m17.220s
sys 0m1.080s
new (on freebsd):
real 0m9.589s
user 0m8.884s
sys 0m0.699s
---
Now I know that too many variables have changed to point exactly at
what's the reason for the speed changes, but does anyone else have
experience with these version differences ? I need to be able to do
about 100 searches/sec which will probably not be a problem, but I am
curious whether someone has some pointers on how I can optimize for
example some sysctl's, UFS mount settings, DB_CONFIG or something else
on this new setup to get the best performance possible ?
Thanks a lot & kind regards,
Leon de Rooij
l...@scarlet-internet.nl
PS: Thanks to all the developers of OpenLDAP, I've been using it
without any problems for a couple of years already and it rocks very
much!
