Re: [PATCH 1/1] selftests/vm: 8x compaction_test speedup

[Jayaramappa, Srilakshmi]

On 10/2/20, 6:05 PM, "Andrew Morton" <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:

    On Fri, 2 Oct 2020 01:06:21 -0700 John Hubbard <jhubbard@xxxxxxxxxx> 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