==========================================================
glibc malloc
----------------------------------------------------------
rw bs iodepth bw iops latency
read 4k 1 150 38511 24
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==========================================================
tcmalloc
----------------------------------------------------------
rw bs iodepth bw iops latency
read 4k 1 156 39969 23
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Signed-off-by: Fam Zheng <famz@redhat.com>
Message-Id: <1427338992-27057-1-git-send-email-famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
configure | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
@@ -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 '$0 --help' for more information"
@@ -1407,6 +1412,8 @@ Advanced options (experts only):
--enable-quorum enable quorum block filter support
--disable-numa disable libnuma support
--enable-numa enable libnuma support
+ --disable-tcmalloc disable tcmalloc support
+ --enable-tcmalloc enable tcmalloc support
NOTE: The object files are built at the place where configure is launched
EOF
@@ -3331,6 +3338,22 @@ EOF
fi
##########################################
+# tcmalloc probe
+
+if test "$tcmalloc" == "yes" ; then
+ cat > $TMPC << EOF
+#include <stdlib.h>
+int main(void) { malloc(1); return 0; }
+EOF
+
+ if compile_prog "" "-ltcmalloc" ; then
+ LIBS="-ltcmalloc $LIBS"
+ else
+ feature_not_found "tcmalloc" "install gperftools devel"
+ fi
+fi
+
+##########################################
# signalfd probe
signalfd="no"
cat > $TMPC << EOF
@@ -4441,6 +4464,7 @@ echo "lzo support $lzo"
echo "snappy support $snappy"
echo "bzip2 support $bzip2"
echo "NUMA host support $numa"
+echo "tcmalloc support $tcmalloc"
if test "$sdl_too_old" = "yes"; then
echo "-> Your SDL version is too old - please upgrade to have SDL support"
From: Fam Zheng <famz@redhat.com> 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: