Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965172AbWHOTS1 (ORCPT ); Tue, 15 Aug 2006 15:18:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965197AbWHOTS1 (ORCPT ); Tue, 15 Aug 2006 15:18:27 -0400 Received: from 1wt.eu ([62.212.114.60]:22799 "EHLO 1wt.eu") by vger.kernel.org with ESMTP id S965172AbWHOTS1 (ORCPT ); Tue, 15 Aug 2006 15:18:27 -0400 Date: Tue, 15 Aug 2006 21:13:57 +0200 From: Willy Tarreau To: "linux-os (Dick Johnson)" Cc: Irfan Habib , Linux kernel Subject: Re: Maximum number of processes in Linux Message-ID: <20060815191356.GC6672@1wt.eu> References: <3420082f0608151059s40373a0bg4a1af3618c2b1a05@mail.gmail.com> <20060815182219.GL8776@1wt.eu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1655 Lines: 68 On Tue, Aug 15, 2006 at 03:13:35PM -0400, linux-os (Dick Johnson) wrote: > > On Tue, 15 Aug 2006, Willy Tarreau wrote: > > > On Tue, Aug 15, 2006 at 02:22:02PM -0400, linux-os (Dick Johnson) wrote: > >> > >> On Tue, 15 Aug 2006, Irfan Habib wrote: > >> > >>> Hi, > >>> > >>> What is the maximum number of process which can run simultaneously in > >>> linux? I need to create an application which requires 40,000 threads. > >>> I was testing with far fewer numbers than that, I was getting > >>> exceptions in pthread_create > >>> > >>> Regards > >>> Irfan > > [SNIPPED bad stuff] > > > > > Dick, would you please initialize your local variables when you send > > examples like this ? You should have been amazed by one billion processes > > on your box, at least. > > > > > Yep.... > > #include > #include > int main() > { > unsigned long i; > for(i = 0; ; i++) > { > switch(fork()) > { > case 0: // kid > pause(); > break; > case -1: // Failed > printf("%lu\n", i); > kill(0, SIGTERM); > exit(0); > default: > break; > } > } > return 0; > } > > Shows a consistent 6140. Better ! :-) 1) how much memory do you have ? 2) Would you try with clone() instead of fork(), you should get more because everything will be shared. Regards, Willy - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/