On Mon, 7 Nov 2005 12:41:03 -0500 (EST) "John Madden" <[EMAIL PROTECTED]> wrote:
> Perhaps it's worth repeating: With a single imapcopy process, the whole thing > goes > along pretty quickly, but drops off significantly with a second process and > comes > to basically a crawl with just 5 processes running concurrently. I gambled > that I > could shorten my migration by running more than one at a time since one only > seems > to raise the load on the box to 0.80. With 5, I'm only able to get it to > around > 2.5 and only briefly as the throughput starts to drop off. That is a start. Try to strace -tt all of imapd processes running concurrently and examine in which syscalls most time is spent. I hope that would give you at least a lead ... For example, on my production system I see some suspicious long pauses at fcntl64(0x8, 0x7, 0xsomeaddr, 0xsomeotheraddr) calls ... lets dig what this is. -- Jure Pečar http://jure.pecar.org/ ---- Cyrus Home Page: http://asg.web.cmu.edu/cyrus Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
