On 07/05/2012 10:41 PM, Mark London wrote:
sgallagh@redhat.com wrote:
Here is my solution to have a persistant uptodate local cache of all ldap entries, so as to avoid very long delays when a user issues a command that causes a large number of LDAP lookups, i.e. by doing a "ls -l /home":

 enumerate = true
 enum_cache_timeout = 86400 (every 24 hours)
 ldap_purge_cache_timeout = 0
 ldap_enumeration_refresh_timeout = 300

What I would like to know, is why long delays occur when doing an "ls -l /home".  Is it because it has to write out each entry into the local database?    
How many users are we talking about, and are they all represented in /home?

The initial enumeration can take up to a few minutes the first time (after that we only update on differences). Once the full enumeration has been completed, it should take about 0.02 seconds per lookup against the local cache. On ordinary lookups, there are no writes going on. Writes to the cache only occur on cache misses.

"ls -l /home" is fast after enumeration.  But if I allow the enum cache to time out, then "ls -l /home" take minutes.  We have 430 directories.  I get around this problem, by setting the cache timeout to be very long.  However, it appears that using this configuration, both sssd_nss and sssd_be are constantly growing in size.  I.e., here are the memory size after about 3 days of use.  The resident memory has grown from about 21m to over 200m.  The ldap refresh (every 5 minutes), appears to be constantly adding to the cache.  Or maybe there is a problem with my configuration that is causing this? 

10468 root      20   0  402m 236m  14m S  0.7  1.5   2:50.74 sssd_nss          
10467 root      20   0  424m 222m 8164 S  0.0  1.4  10:20.20 sssd_be

Thanks. - Mark


Mark, is there any way we can have a full description of the use case. Something is not right here so we would need to try to reproduce the issue. But we need a good overview of what is going on in your case and how things are configured. I know you provided big pieces of this information across multiple emails. Can you please consolidate it into one report and open a trac ticket or BZ? 

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-- 
Thank you,
Dmitri Pal

Sr. Engineering Manager IPA project,
Red Hat Inc.


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