Return-Path: Delivered-To: apmail-lucene-lucene-net-user-archive@www.apache.org Received: (qmail 66331 invoked from network); 20 Jan 2011 07:21:00 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 20 Jan 2011 07:21:00 -0000 Received: (qmail 50412 invoked by uid 500); 20 Jan 2011 07:21:00 -0000 Delivered-To: apmail-lucene-lucene-net-user-archive@lucene.apache.org Received: (qmail 50169 invoked by uid 500); 20 Jan 2011 07:20:57 -0000 Mailing-List: contact lucene-net-user-help@lucene.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: lucene-net-user@lucene.apache.org Delivered-To: mailing list lucene-net-user@lucene.apache.org Received: (qmail 50155 invoked by uid 99); 20 Jan 2011 07:20:56 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 20 Jan 2011 07:20:56 +0000 X-ASF-Spam-Status: No, hits=1.5 required=10.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of anders@lybecker.com designates 209.85.216.48 as permitted sender) Received: from [209.85.216.48] (HELO mail-qw0-f48.google.com) (209.85.216.48) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 20 Jan 2011 07:20:50 +0000 Received: by qwh6 with SMTP id 6so269470qwh.35 for ; Wed, 19 Jan 2011 23:20:29 -0800 (PST) MIME-Version: 1.0 Received: by 10.224.73.202 with SMTP id r10mr1635389qaj.131.1295508028859; Wed, 19 Jan 2011 23:20:28 -0800 (PST) Received: by 10.220.62.6 with HTTP; Wed, 19 Jan 2011 23:20:28 -0800 (PST) In-Reply-To: <-2057871570042187798@unknownmsgid> References: <004601cbb5be$c1da8b50$458fa1f0$@com> <7C792063A22DFB40A9387B1D11B012F67358A462CA@EXMB01.uk.conde-nast.biz> <-2057871570042187798@unknownmsgid> Date: Thu, 20 Jan 2011 08:20:28 +0100 Message-ID: Subject: Re: Lucene.Net 2.9 Uses Single Processor under Stress From: Anders Lybecker To: lucene-net-user@lucene.apache.org Content-Type: multipart/alternative; boundary=0015175cba9add261a049a41f7ee X-Virus-Checked: Checked by ClamAV on apache.org --0015175cba9add261a049a41f7ee Content-Type: text/plain; charset=ISO-8859-1 Hi, Do you open the IndexReader/IndexSearcher in readonly mode? :-) Anders On Wed, Jan 19, 2011 at 10:15 PM, Frank Yu wrote: > Hi All, > > I met a strange situation that the Lucene.Net used only 1 processor on a > quad dual-core processors machine when the search load exceeded a certain > threshold (i.e., 35 searches per second). It took a few minutes before the > load got distributed over all processors. When the load was below the > threshold (i.e., 20 searches per second), all processors got used evenly. > > The used Lucene.net is v2.9 and the index size is about 4GB with 15 > millions > of documents. There was no index update and the load was search only > without > any index update. > > Has anyone seen this kind of behavior before? > > Thanks a lot, > > Frank > > > --0015175cba9add261a049a41f7ee--