--On Sunday, June 05, 2011 5:41 PM -0500 Mark <mah042(a)gmail.com&gt; wrote: I'm setting up a new installation of OpenLDAP 2.4.25 on RHEL machines > each with 128GB RAM and 4 Intel Xeon E7530 CPUs (6 cores each, each core > supporting two threads). /proc/cpuinfo shows there are 48 processors. The > backend hdb database will eventually have millions of records with > thousands of concurrent readers and writers. Is there a good equation to > use for determining a value for threads and tool-threads? I'd like to > take advantage of the hardware available. I get a warning if I set > threads higher than 32: > > olcThreads: value #0: warning, threads=48 larger than twice the default > (2*16=32); YMMV. > > I shouldn't be slapcat'ing and slapadd'ing it very often, but like to set > tool-threads to an appropriate value for the hardware. > How many real cores do you have? Generally tool-threads should be set to that number. Generally threads should be set to no more than 4 threads per real core IIRC (8 is generally good for 1 or 2 cores, 16 for 4 cores, etc). --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