<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">In the Wiki FAQ about performance, I found the following run on sentence. I've reread it a dozen times and I'm still not sure that I completely understand what the author meant. If someone would be willing to parse this out for me, I'd be happy to rewrite it for the wiki.<div><br></div><div><blockquote type="cite">Memory. RT uses a lot of memory in total. You need adopt amount of process(Apache, FastCGI, DB) to fit into 70% your memory under average workload. For example, if you have RT on Apache/mp/mysql with ~20-30 end-users, then it's enough to have 4-6 Apache processes this also control DB processes/threads because eache Apache instance with Apache::DBI has own DB connect each DB connect require one or more DB process/thread to support. Also people report that one FastCGI process can serve 2-3 Apache processes. You also have to leave room for memory usage growing, example: Apache/mp process has 10-25MB size under average workload, but on big incoming message memory footprint could grow up to 200-300MB. Out of memory is most perfomance problem it's blow up HDD activity for swap out/in memory. </blockquote></div><div><br></div><div>In particular, "adopt amount of process to fit into 70% your memory". Does this mean calculate the memory usage of Mod_Perl or FastCGI processes and come up with a number of processes which wouldn't exceed 70% of your total memory? Ie,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>60mb per process </div><div><span class="Apple-tab-span" style="white-space:pre"> </span>1024mb total ram</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>Set Apache MaxServers = 11 ? (60mb * 11 = 660mb of ram)</div><div><br><div> <span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">--<span class="Apple-converted-space"> </span></font></p><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">Jo Rhett</font></p><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">Net Consonance : consonant endings by net philanthropy, open source and other randomness</font></p></span></span></span></span></div><br class="Apple-interchange-newline"></span> </div><br></div></body></html>