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Re: [Qemu-devel] [PATCH] configure: Add support for tcmalloc
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH] configure: Add support for tcmalloc |
Date: |
Thu, 26 Mar 2015 13:53:32 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Am 26.03.2015 um 04:03 hat Fam Zheng geschrieben:
> This adds "--enable-tcmalloc" and "--disable-tcmalloc" to allow linking
> to libtcmalloc from gperftools.
>
> tcmalloc is a malloc implementation that works well with threads and is
> fast, so it is good for performance.
>
> It is disabled by default, because the MALLOC_PERTURB_ flag we use in
> tests doesn't work with tcmalloc. However we can enable tcmalloc
> specific heap checker and profilers later.
>
> An IOPS gain can be observed with virtio-blk-dataplane, other parts of
> QEMU will directly benefit from it as well:
>
> ==========================================================
> glibc malloc
> ----------------------------------------------------------
> rw bs iodepth bw iops latency
> read 4k 1 150 38511 24
> ----------------------------------------------------------
>
> ==========================================================
> tcmalloc
> ----------------------------------------------------------
> rw bs iodepth bw iops latency
> read 4k 1 156 39969 23
> ----------------------------------------------------------
>
> Signed-off-by: Fam Zheng <address@hidden>
> ---
> configure | 24 ++++++++++++++++++++++++
> 1 file changed, 24 insertions(+)
>
> diff --git a/configure b/configure
> index 589798e..03ba305 100755
> --- a/configure
> +++ b/configure
> @@ -336,6 +336,7 @@ libssh2=""
> vhdx=""
> quorum=""
> numa=""
> +tcmalloc="no"
>
> # parse CC options first
> for opt do
> @@ -1134,6 +1135,10 @@ for opt do
> ;;
> --enable-numa) numa="yes"
> ;;
> + --disable-tcmalloc) tcmalloc="no"
> + ;;
> + --enable-tcmalloc) tcmalloc="yes"
> + ;;
> *)
> echo "ERROR: unknown option $opt"
> echo "Try '$0 --help' for more information"
> @@ -1407,6 +1412,8 @@ Advanced options (experts only):
> --enable-quorum enable quorum block filter support
> --disable-numa disable libnuma support
> --enable-numa enable libnuma support
> + --disable-tcmalloc disable tcmalloc support
> + --enable-numa enable tcmalloc support
Almost. :-)
Kevin