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Re: openldap very fast on one machine, slow on another
Jason Joines wrote:
I have OpenLDAP 2.2 set up on a test machine and it's very fast.
Once I got it set the way I wanted I did an install on a production
machine and it's very slow. It's so slow that if I tell sshd to only
allow certain groups to authenticate, it fails because it times out
before the groups are retrieved. On the test (fast) machine the
"groups user" command takes less than 1 second to retrieve the list of
users. On the production (slow) machine, it takes almost 13 seconds
for the same user. If I point the slow machine at the fast machine it
still takes less than 1 second as opposed to the 13 seconds for
localhost. The same time difference is obvious using ldapsearch as well.
The only difference I can find between the machine is that the fast
test machine is an old Dell OptiPlex Gx1p desktop with a PII 600 and
256 MB RAM and the slow production machine is a Dell PowerEdge 2550
with a PIII 1000 and 512 MB RAM.
They both have the same data in the directory, the same
configuration, same software versions:
SuSE Linux 9.1
Actually, I just found something that doesn't match. The fast box
is using kernel 2.6.5 and the slow box is using 2.6.8.
Any ideas on how to track down what's causing this problem?
You don't say how you configured your DB_CONFIG; I note that using the
default (i.e. no DB_CONFIG) dramatically impacts performance, and may
result in major differences when minor hardware or even software
differences are present. See Sleepycat's documentation, the annotated
example DB_CONFIG provided by recent OpenLDAP releases and
http://www.openldap.org/faq/data/cache/1072.html for some comments on
the impact of different parameters (keep in mind that only the Sleepycat
docs are authoritative, as changes in the db software may not be timely
relected in the OpenLDAP docs, including the FAQ).
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