From: Saurabh Desai <sdesai@austin.ibm.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@transmeta.com>,
Andrew Morton <akpm@zip.com.au>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
NPT library mailing list <phil-list@redhat.com>
Subject: Re: [patch] mmap-speedup-2.5.42-C3
Date: Tue, 15 Oct 2002 20:14:00 -0500 [thread overview]
Message-ID: <3DACBD58.AAD8F0A@austin.ibm.com> (raw)
In-Reply-To: Pine.LNX.4.44.0210151438440.10496-100000@localhost.localdomain
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.
WARNING: multiple messages have this Message-ID (diff)
From: Saurabh Desai <sdesai@austin.ibm.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@transmeta.com>,
Andrew Morton <akpm@zip.com.au>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
NPT library mailing list <phil-list@redhat.com>
Subject: Re: [patch] mmap-speedup-2.5.42-C3
Date: Tue, 15 Oct 2002 20:14:00 -0500 [thread overview]
Message-ID: <3DACBD58.AAD8F0A@austin.ibm.com> (raw)
In-Reply-To: Pine.LNX.4.44.0210151438440.10496-100000@localhost.localdomain
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.
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next prev parent reply other threads:[~2002-10-16 1:08 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-15 13:11 [patch] mmap-speedup-2.5.42-C3 Ingo Molnar
2002-10-15 13:11 ` Ingo Molnar
2002-10-15 18:09 ` Andrew Morton
2002-10-15 18:09 ` Andrew Morton
2002-10-15 21:30 ` Andi Kleen
2002-10-16 8:03 ` Ingo Molnar
2002-10-16 8:07 ` Jakub Jelinek
2002-10-16 8:27 ` Ingo Molnar
2002-10-16 8:22 ` Jakub Jelinek
2002-10-16 9:16 ` Andi Kleen
2002-10-16 9:47 ` Ingo Molnar
2002-10-16 12:08 ` Jakub Jelinek
2002-10-16 1:14 ` Saurabh Desai [this message]
2002-10-16 1:14 ` Saurabh Desai
2002-10-16 8:14 ` Ingo Molnar
2002-10-16 8:14 ` Ingo Molnar
2002-10-16 14:52 ` Linus Torvalds
2002-10-16 14:52 ` Linus Torvalds
2002-10-16 15:49 ` Arjan van de Ven
2002-10-16 16:10 ` Andrew Morton
2002-10-16 16:10 ` Andrew Morton
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