From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3DACBD58.AAD8F0A@austin.ibm.com> Date: Tue, 15 Oct 2002 20:14:00 -0500 From: Saurabh Desai MIME-Version: 1.0 Subject: Re: [patch] mmap-speedup-2.5.42-C3 References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Ingo Molnar Cc: Linus Torvalds , Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, NPT library mailing list List-ID: Ingo Molnar wrote: > > the attached patch (against BK-curr) adds three new, threading related > improvements to the VM. > > the first one is an mmap inefficiency that was reported by Saurabh Desai. > The test_str02 NPTL test-utility does the following: it tests the maximum > number of threads by creating a new thread, which thread creates a new > thread itself, etc. It basically creates thousands of parallel threads, > which means thousands of thread stacks. Like to point out, test_str02 is a NGPT test program not NPTL. > the patch was tested on x86 SMP and UP. Saurabh, can you confirm that this > patch fixes the performance problem you saw in test_str02? > Yes, the test_str02 performance improved a lot using NPTL. However, on a side effect, I noticed that randomly my current telnet session was logged out after running this test. Not sure, why? I applied your patch on 2.5.42 kernel and running glibc-2.3.1pre2. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/