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<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV>Does Cyrus-imapd take advantage of Dual and\or Quad core processors? We
are looking at upgrading our server to either 2x Dual core Xeon’s or 1 x Quad
core Xeon processor. Does Cyrus have the ability to take advantage of
this?<o:p></o:p></DIV></BLOCKQUOTE>
<DIV class=Section1><FONT face=Arial size=2>Since it uses a multi-process model,
yes it does.</FONT></DIV>
<DIV class=Section1><FONT face=Arial size=2></FONT> </DIV>
<DIV class=Section1><FONT face=Arial size=2>However that's not what you should
upgrade your servers for. cyrus uses very little CPU time on any modern
processor. Even with 10,000's of users, our servers with 3 year old 2.4Ghz
Netburst Xeons never get more than about 30% CPU usage (out of 400% because
they're dual processor, hyper-threaded machines).</FONT></DIV>
<DIV class=Section1><FONT face=Arial size=2></FONT> </DIV>
<DIV class=Section1><FONT face=Arial size=2>Instead cyrus is incredibly IO
hungry. You should have as much RAM as possible for caching, and a battery
backed NVRAM RAID controller to try and improve the random write IO that's
generated. These will do much more for you than upgrading your CPU
will.</FONT></DIV>
<DIV class=Section1><FONT face=Arial size=2></FONT> </DIV>
<DIV class=Section1><FONT face=Arial size=2>Rob</FONT></DIV>
<DIV class=Section1><FONT face=Arial size=2></FONT> </DIV></BODY></HTML>