On 10/12/2011 04:15 PM, Justin Gronfur wrote: > On 10/12/2011 03:07 PM, Rich Megginson wrote: >> This is helpful. Any chance you could paste the entire stack >> traces? For example, >> #0 0x0000003735c3c868 in slapi_get_mapping_tree_node_by_dn@plt () >> from /usr/lib64/dirsrv/libslapd.so.0 >> #0 0x0000003735c4ad38 in slapi_dn_normalize_ext () from >> /usr/lib64/dirsrv/libslapd.so.0 >> etc. are nice to have, but much better would be the entire stack >> traces of these calls so we can see where they are called from. > > Attached is a set of full gstack dumps taken at 1 second intervals. > The majority of it consists of select/poll/etc... calls that I > filtered out last time, but left in this time for context. Thanks.
The select/poll are the server basically idle, waiting on a condition variable for new work to perform. You can eliminate many of these by decreasing your cn=config nsslapd-threadnum setting. The default is 30, but you may find better performance by setting to somewhere around 2 times the number of cpus/cores you have on your machine (but at least 8). Do you know if any of these come from a period of time during which the server is consuming a lot of CPU? > > One of my coworkers wanted me to mention that we use long running ldap > connections (bound to a user's session for the duration of that > session unless the session is replicated to another jvm instance). I > know that isn't really standard, but I don't think that should cause > these problems. No, should not be a problem. And it is standard - many apps do this (e.g. a web service that uses ldap for auth will not want to open/close a connection for every single user - it will typically use a connection pool of already open and possibly idle connections). > > Tomorrow I'm planning on writing a forking bash process to push the > exact same requests under the exact same load at 389 to determine if > it is a problem caused by the java code or container itself (by > eliminating them completely). I'll keep you posted on the result of > this. > > Thanks, > Justin -- 389 users mailing list 389-users@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/389-users
