Return-Path: Delivered-To: apmail-httpd-dev-archive@www.apache.org Received: (qmail 74406 invoked from network); 20 Oct 2008 12:37:56 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.2) by minotaur.apache.org with SMTP; 20 Oct 2008 12:37:56 -0000 Received: (qmail 68899 invoked by uid 500); 20 Oct 2008 12:37:56 -0000 Delivered-To: apmail-httpd-dev-archive@httpd.apache.org Received: (qmail 68847 invoked by uid 500); 20 Oct 2008 12:37:56 -0000 Mailing-List: contact dev-help@httpd.apache.org; run by ezmlm Precedence: bulk Reply-To: dev@httpd.apache.org list-help: list-unsubscribe: List-Post: List-Id: Delivered-To: mailing list dev@httpd.apache.org Received: (qmail 68838 invoked by uid 99); 20 Oct 2008 12:37:56 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 20 Oct 2008 05:37:56 -0700 X-ASF-Spam-Status: No, hits=-0.0 required=10.0 tests=SPF_HELO_PASS,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of minfrin@sharp.fm designates 72.32.122.47 as permitted sender) Received: from [72.32.122.47] (HELO chandler.sharp.fm) (72.32.122.47) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 20 Oct 2008 12:36:47 +0000 Received: from chandler.sharp.fm (localhost [127.0.0.1]) by chandler.sharp.fm (Postfix) with ESMTP id BBF5013004D for ; Mon, 20 Oct 2008 07:37:24 -0500 (CDT) Received: from Macintosh.local (unknown [132.185.237.115]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: minfrin@sharp.fm) by chandler.sharp.fm (Postfix) with ESMTP id 3674713004C for ; Mon, 20 Oct 2008 07:37:24 -0500 (CDT) Message-ID: <48FC7B7F.7030609@sharp.fm> Date: Mon, 20 Oct 2008 14:37:19 +0200 From: Graham Leggett User-Agent: Thunderbird 2.0.0.17 (Macintosh/20080914) MIME-Version: 1.0 To: dev@httpd.apache.org Subject: Re: strange usage pattern for child processes References: In-Reply-To: Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms000704080607080500000407" X-Virus-Scanned: ClamAV using ClamSMTP X-Virus-Checked: Checked by ClamAV on apache.org This is a cryptographically signed message in MIME format. --------------ms000704080607080500000407 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Akins, Brian wrote: > Would not the generic "store-and-forward" approach I sent last week help all > of these situations? It effective turns any request into a "sendfiled" > response. Let me do some checking and I may be able to just donate the > code, since it's basically a very hacked up mod_deflate crossed with > mod_xsendfile. It works for us, but we don't use the stock proxy, so not > 100% it will help if the frontend and backend pools are somehow "linked." This technique was used in the large disk cache work from 2006, and worked very well. Whether it will work in the current flow though I am not so sure. The current flow looks like this: read-backend -> write-and-flush-frontend -> disconnect-backend As I understand it, the flush part is the killer. The disconnect-backend should happen before the flush, not after. 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