--On Saturday, February 19, 2011 6:32 PM -0800 Howard Chu <hyc(a)symas.com&gt; wrote: > Omer Faruk SEN wrote: >> >> Hi , >> >> I have and ldap server (openldap-2.4.23 ) in slapd.conf I set >> >> concurrency  8192 >> threads 256 > Keep in mind that each thread uses a thread stack of 4MB on 32 bit > systems, 8MB on 64 bit systems. So you're looking at 1-2GB of RAM > dedicated to the threads with a setting like this. Make sure you don't > configure more threads than you have RAM for... I would add that your threads setting is likely a rather insane value unless you have 256*4 cores (1024 core box).  You generally don't need to set the threads value higher than 8 or 16. --Quanah -- Quanah Gibson-Mount Sr. Member of Technical Staff Zimbra, Inc A Division of VMware, Inc. -------------------- Zimbra ::  the leader in open source messaging and collaboration