From: "Jayaramappa, Srilakshmi" <sjayaram@akamai.com>
To: Andrew Morton <akpm@linux-foundation.org>,
John Hubbard <jhubbard@nvidia.com>
Cc: Shuah Khan <shuah@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kselftest@vger.kernel.org"
<linux-kselftest@vger.kernel.org>
Subject: Re: [PATCH 1/1] selftests/vm: 8x compaction_test speedup
Date: Fri, 2 Oct 2020 23:25:25 +0000 [thread overview]
Message-ID: <050F889A-AE47-47E4-8334-0D6FC7170721@akamai.com> (raw)
In-Reply-To: <20201002150520.2ea3db53d88f8d10ba8348c9@linux-foundation.org>
On 10/2/20, 6:05 PM, "Andrew Morton" <akpm@linux-foundation.org> wrote:
On Fri, 2 Oct 2020 01:06:21 -0700 John Hubbard <jhubbard@nvidia.com> wrote:
> This patch reduces the running time for compaction_test from about 27
> sec, to 3.3 sec, which is about an 8x speedup.
>
> These numbers are for an Intel x86_64 system with 32 GB of DRAM.
>
> The compaction_test.c program was spending most of its time doing
> mmap(), 1 MB at a time, on about 25 GB of memory.
>
> Instead, do the mmaps 100 MB at a time. (Going past 100 MB doesn't make
> things go much faster, because other parts of the program are using the
> remaining time.)
Seems nice. It's been 5 years, but hopefully Sri is still at Akamai?
Looks good to me.
Thanks
-Sri
prev parent reply other threads:[~2020-10-02 23:25 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-02 8:06 [PATCH 0/1] " John Hubbard
2020-10-02 8:06 ` [PATCH 1/1] " John Hubbard
2020-10-02 22:05 ` Andrew Morton
2020-10-02 23:25 ` Jayaramappa, Srilakshmi [this message]
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