Date: Wed, 20 Feb 2002 13:02:52 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: Vincent Janelle <random@carnagecopia.com> Cc: "Dreamtime.net Inc." <clients@dreamtime.net>, freebsd-smp@FreeBSD.ORG Subject: Re: Systat and Ram Message-ID: <3C740EFC.BE36E2DD@mindspring.com> References: <3C736028.FBD0F093@mindspring.com> <AMEMLPOHFFIAJKMDAFDLKEAODOAA.clients@dreamtime.net> <20020220122922.2bbbd161.random@carnagecopia.com>
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Vincent Janelle wrote: > "Dreamtime.net Inc." <clients@dreamtime.net> wrote: > > Actually, we need to run anywhere from 30 to 300 httpd processes, 20-25 megs > > each. We want to know how can we decide if we need more RAM based on > > 'systat' output. > > If you're using http, you can achieve better scalability once you max out your > memory and CPU by just adding more machines and a load-balancer.. Depends on the load balancer, and depends on the HTTP applications. For simple content, that is correct. For session content, that's incorrect, and for a lot of session sensitive CGIs, the state is not shared between machines in the HTTP cluster. For host sensitive state (e.g. session cookies, etc.), you need more than a simple brain-dead hardware load balancer. Obviously, if you are developing the applications yourself and don't make mistakes, then you can use a brain-dead load balancer with no problem, but many third party "shopping cart" applications are pretty stupid about session state. So is PHP's default session handling, for that matter. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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