We have run many stress tests on qmailLDAP + OpenLDAP. The latest version we tested was 20011001a (without big-todo). The testing result showed that any one PIII 1Ghz with 1 GB Ram and SCIS disk could yield 30 message per second on SMTP. Of cource, due to qmail-local message delivery limitation there are messages still in the queue even after the stress test from SMTP connections.
Your problem is most properly due to OpenLDAP configuration. In our recent, internal Directory Server stress test using DirectoryMark, OpenLDAP 2.0.25 beats Netscape Directory server 5.1 on Red Hat Linux 7.3 with ldapsearch using the above hardware configuration. Check your slapd.conf against the OpenLDAP Administrator's Guide especially on indexing, cachesize and dbcachesize. We use 50 x the default cachesize and 5 x the default dbcachesize. K. F. Yim ----- Original Message ----- From: "Aaron Gee" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, October 19, 2002 3:00 AM Subject: qmail+openldap=performance? I've been playing with qmail ldap for a few weeks. I have a small cluster running on high-end Pentium servers with a 2 servers in the cluster. One of the servers also runs the openldap server. We found from testing that 1. 500 messages/minute was the max/server input we could achieve (started at 531 and then went to 500 for each minute thereafter) 2. Total Transfer was about 50mb/min/server 3. The openldap server stopped responding to queries after the first 1 minute 4. All mail was queued, and eventually delivered (albeit SLOWLY). The ldap server seemed to recover, but it didn't seem up to the task of being "blasted" for this test. I didn't run the test past 5 minutes because the queue was growing very quickly, and I at least got some numbers to test with. I thought I would pass this on. The machine was tested 35,000 users in the ldap server. Since we want the ldap server to handle about 140,000 accounts, the servers not responding and SLOWNESS of eventual delivery has made us rethink using qmail ldap. Any other real world experience out there? Just curious. Aaron
