Date: Sat, 20 Apr 2002 17:00:27 -0700 (PDT) From: Tom Samplonius <tom@sdf.com> To: James Jeffrey <james@jgj.org.uk> Cc: Simon <simon@optinet.com>, "freebsd-isp@freebsd.org" <freebsd-isp@freebsd.org> Subject: Re: Apache 2 MPMs Message-ID: <Pine.BSF.4.05.10204201656260.22453-100000@misery.sdf.com> In-Reply-To: <4A8DCD48-54A3-11D6-A332-003065A1F05E@jgj.org.uk>
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The FreeBSD VM system allows all unmodified pages to be shared between forked processes. This is one of the reasons why I really doubt that Apache 2.x will require less memory than 1.3. Not to mention that Apache 2.x is undergoing feature bloat. About the only advantage of the thread architecture is that context switching overhead should be lower than with processes. However, process context switching has been optimized so much that a good process implementation performs faster than a bad thread implementation. Tom On Sat, 20 Apr 2002, James Jeffrey wrote: > My understanding may be flawed (and I am interested in learning...) but > I though one of the advantages of using threads over forking was that > multiple threads can share the same memory resident copy of the binary > and that only data memory had to be allocated for each thread, where as > forked processes each need there own resident copy of the program. > Therefore threads use less memory and theoretically so can Apache 2 > except, sadly, on FreeBSD... > > James. > > On Saturday, April 20, 2002, at 09:10 PM, Tom Samplonius wrote: > > > > > And you expect Apache 2.x to use less RAM? I really doubt it. > > > > Tom > > > > On Sat, 20 Apr 2002, Simon wrote: > > > >> > >> Some of our servers do over 1.3TB a month, avg request is 8kB > >> I can't wait for FBSD 5.x, hopefully threads are much better then. > >> 1.3.x Apache eats way too much RAM, but oh well, it's free :-) > >> > >> -Simon > >> > >> On Sat, 20 Apr 2002 11:15:28 -0700 (PDT), Tom Samplonius wrote: > >> > >>> > >>> First of all, how many of the modules you need will be threadsafe? > >>> Many > >>> of the PHP add-ons are not thread safe. > >>> > >>> Unless you have servers pushing out more than 500GB/month, I wouldn't > >>> worry about the difference between prefork and prefork/thread. > >>> > >>> Tom > >>> > >>> On Sat, 20 Apr 2002, James Jeffrey wrote: > >>> > >>>> Hello, > >>>> > >>>> I have just started a new job for an ISP currently using some Linux > >>>> servers. I want to start to move them across to FreeBSD, but I'm > >>>> concerned that Apache 2 will use the prefork MPM on our favourite > >>>> platform rather than the newer prefork/thread combination one... Does > >>>> anyone know: > >>>> > >>>> Why this is? > >>>> When it will be fixed? > >>>> What performance penalty this will cause against, for example, Linux? > >>>> How good is the new MPM? > >>>> > >>>> thanks, > >>>> > >>>> James > >>>> > >>>> > >>>> To Unsubscribe: send mail to majordomo@FreeBSD.org > >>>> with "unsubscribe freebsd-isp" in the body of the message > >>>> > >>>> > >>> > >>> > >>> To Unsubscribe: send mail to majordomo@FreeBSD.org > >>> with "unsubscribe freebsd-isp" in the body of the message > >>> > >> > >> > >> > >> > >> To Unsubscribe: send mail to majordomo@FreeBSD.org > >> with "unsubscribe freebsd-isp" in the body of the message > >> > >> > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > with "unsubscribe freebsd-isp" in the body of the message > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-isp" in the body of the message > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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