Return-Path: Delivered-To: apmail-incubator-harmony-dev-archive@www.apache.org Received: (qmail 3831 invoked from network); 30 Jul 2006 23:06:21 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (209.237.227.199) by minotaur.apache.org with SMTP; 30 Jul 2006 23:06:21 -0000 Received: (qmail 19684 invoked by uid 500); 30 Jul 2006 23:06:15 -0000 Delivered-To: apmail-incubator-harmony-dev-archive@incubator.apache.org Received: (qmail 19313 invoked by uid 500); 30 Jul 2006 23:06:15 -0000 Mailing-List: contact harmony-dev-help@incubator.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: harmony-dev@incubator.apache.org Delivered-To: mailing list harmony-dev@incubator.apache.org Received: (qmail 19302 invoked by uid 99); 30 Jul 2006 23:06:15 -0000 Received: from asf.osuosl.org (HELO asf.osuosl.org) (140.211.166.49) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 30 Jul 2006 16:06:15 -0700 X-ASF-Spam-Status: No, hits=0.5 required=10.0 tests=DNS_FROM_RFC_ABUSE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (asf.osuosl.org: domain of alex.blewitt@gmail.com designates 64.233.182.186 as permitted sender) Received: from [64.233.182.186] (HELO nf-out-0910.google.com) (64.233.182.186) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 30 Jul 2006 16:06:14 -0700 Received: by nf-out-0910.google.com with SMTP id x4so327329nfb for ; Sun, 30 Jul 2006 16:05:52 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=YyF2YauHUy1I1Bm7fCP59t3k1X9bCOaDLNCXhgSHjL+JGb+GXsmUKaVALNH9teB0Peq3nBjPjjeWTb2dYeDnL2eHIJlThHQpxdugfOLzVNhy7x88JhOQexa3IHZGwD/8lqovOhPceHuDpwFe1Sm3+9vSho87hQbENCu5BTGb0qI= Received: by 10.78.193.19 with SMTP id q19mr362732huf; Sun, 30 Jul 2006 16:05:52 -0700 (PDT) Received: by 10.78.83.13 with HTTP; Sun, 30 Jul 2006 16:05:52 -0700 (PDT) Message-ID: <636fd28e0607301605p3e48cc8epe29af941388d1dc4@mail.gmail.com> Date: Mon, 31 Jul 2006 00:05:52 +0100 From: "Alex Blewitt" To: harmony-dev@incubator.apache.org Subject: Re: Re: [rant] Memory options in VM -- why is the default not 'unlimited' In-Reply-To: <44CD0886.7020707@sourcelabs.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <636fd28e0607290058q21566ec0uad96426092ad891a@mail.gmail.com> <44CB772F.1000705@Intel.com> <636fd28e0607291155sd0891a6w705e59640df5202c@mail.gmail.com> <44CBBA76.1050505@Intel.com> <44CBC267.3020304@Intel.com> <44CBC589.6070005@Intel.com> <636fd28e0607291616h55ec3e43u4d20c449392b80d3@mail.gmail.com> <9623c9a50607291656r2b83f373h2cff092f48003e9e@mail.gmail.com> <44CD0886.7020707@sourcelabs.com> X-Virus-Checked: Checked by ClamAV on apache.org X-Spam-Rating: minotaur.apache.org 1.6.2 0/1000/N On 30/07/06, will pugh wrote: > Isn't Full GCs a big problem? If have a bunch of pages in virtual > memory, and need to do a full heap walk. Won't you basically have an > exercise in page faults? Realistically, doesn't that happen for any full GC though, regardless of how they're laid out? Even if the JVM requests a single large contiguous space, it will still be treated as many pages by the OS, and you'll get a similar amount of page faults. It doesn't matter what virtual address space they're mapped into. One of the suggestions I put forward elsewhere was having several zones (one per classloader); the advantage would then be you could GC each zone separately, and potentially at different intervals. Alex. --------------------------------------------------------------------- Terms of use : http://incubator.apache.org/harmony/mailing.html To unsubscribe, e-mail: harmony-dev-unsubscribe@incubator.apache.org For additional commands, e-mail: harmony-dev-help@incubator.apache.org