If I understand the situation you've described, here's how I see the expected system usage. Assumptions: 50M/PDF Generation takes 1.6X final size (min) 100 simultaneous users 20% memory block fragmentation (typ) LAMP overhead ~ 1.5G ((50*100*1.6)/0.8) + 1500 = 11500M 11.5G peak memory usage. Depending on your traffic pattern, your typical usage may well exceed the 2G physical available. I'd allocate at *least* 4G Swap in that situation, and I'd make sure to run a 64-bit kernel on a 64-bit CPU (Opteron/Athlon-64/Itanium) I'd also make *really* sure the app handles an out-of-memory situation gracefully. Don Calfa wrote: > On one server now that's basically LAMP and mail, I have 20 sites > that reach about 10 Gig a month. > With 512M, I have any any time about 36M free with 36M used in swap. > > The sites I'm moving over have traffic that is about 60G a month and > the server they're on now is slooooooow. > I know PDF is a memory hog and I just want to be prepared for about a > hundred users at a time generating PDF's. > > > Rob Wultsch wrote: > >> Hope much total memory are you intending on using? I rather doublt >> that you would need 4 GB of swap. >> >> >> On Fri, 25 Feb 2005 15:55:23 -0700, Don Calfa >> wrote: >> >> >>> Usually the rule of thumb for swap is 2x physical memory (AFAIK) >>> I'm remembering that there isn't a need for swap larger than 2Gig but >>> I'm not sure. >>> >>> If I install 2 Gig of memory in a server, do I really need 4 Gig of >>> swap? >>> --------------------------------------------------- >>> >>> >> >> >> >> >> > > --------------------------------------------------- > PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us > To subscribe, unsubscribe, or to change you mail settings: > http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss >