Received: from magus.postgresql.org (magus.postgresql.org [87.238.57.229]) by mail.postgresql.org (Postfix) with ESMTP id D6AE81B31A53 for ; Thu, 24 May 2012 03:54:47 -0300 (ADT) Received: from corp.tradeindia.com ([61.16.154.82] helo=zmta01.trade-india-local.com) by magus.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1SXRwa-0001KC-Ur for pgsql-performance@postgresql.org; Thu, 24 May 2012 06:54:46 +0000 Received: from localhost (localhost.localdomain [127.0.0.1]) by zmta01.trade-india-local.com (Postfix) with ESMTP id 5904744E0C35; Thu, 24 May 2012 12:24:27 +0530 (IST) X-Virus-Scanned: amavisd-new at zmta01.trade-india-local.com Received: from zmta01.trade-india-local.com ([127.0.0.1]) by localhost (zmta01.trade-india-local.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YlfpF9jK3gmg; Thu, 24 May 2012 12:24:18 +0530 (IST) Received: from zmbox01.trade-india-local.com (zmbox01.trade-india-local.com [192.168.1.111]) by zmta01.trade-india-local.com (Postfix) with ESMTP id 2682144D75BC; Thu, 24 May 2012 12:24:18 +0530 (IST) Date: Thu, 24 May 2012 12:24:17 +0530 (IST) From: "Rajesh Kumar. Mallah" To: Claudio Freire Cc: pgsql-performance@postgresql.org Message-ID: <17861168.278931337842457837.JavaMail.root@zmbox01.trade-india-local.com> In-Reply-To: <27827814.275321337842086409.JavaMail.root@zmbox01.trade-india-local.com> Subject: Re: High load average in 64-core server , no I/O wait and CPU is idle MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Originating-IP: [192.168.1.114] X-Mailer: Zimbra 6.0.1_GA_1816.DEBIAN4.0 (ZimbraWebClient - FF3.0 (Linux)/6.0.1_GA_1816.DEBIAN4.0) X-Pg-Spam-Score: -0.5 (/) X-Archive-Number: 201205/118 X-Sequence-Number: 46942 | | Load avg is the number of processes in the running queue, which can | be either waiting to be run or actually running. | | So if you had 100% CPU usage, then you'd most definitely have a load | avg of 64, which is neither good or bad. It may simply mean that | you're using your hardware's full potential. Dear Claudio , Thanks for the reply and clarifying on the "actually running" part. below is a snapshot of the top output while the system was loaded. top - 12:15:13 up 101 days, 19:01, 1 user, load average: 23.50, 18.89, 21.74 Tasks: 650 total, 11 running, 639 sleeping, 0 stopped, 0 zombie Cpu(s): 26.5%us, 5.7%sy, 0.0%ni, 67.2%id, 0.0%wa, 0.0%hi, 0.6%si, 0.0%st Mem: 131971752k total, 122933996k used, 9037756k free, 251544k buffers Swap: 33559780k total, 251916k used, 33307864k free, 116356252k cached Our applications does slowdown when loads are at that level. Can you please tell what else can be metered? | | If your processes are waiting but not using CPU or I/O time... all I | can think of is mcelog (it's the only application I've ever witnessed | doing that). Do check ps/top and try to find out which processes are | in a waiting state to have a little more insight. I will read more on the processes status and try to keep a close eye over it. I shall be responding after a few hours on it. regds mallah. | | -- | Sent via pgsql-performance mailing list | (pgsql-performance@postgresql.org) | To make changes to your subscription: | http://www.postgresql.org/mailpref/pgsql-performance