Speedup Mysql and Webserver with Intel Compiler and tcmalloc
After reading some recent benchmark reguarding tcmalloc performance on mysql. I decide to rebuild my whole webhosting stack with it.
ICC is intel’s c++ compiler, which has faster performance is also memtioned on mysql website.
Most distros should already has google performance tools prepackaged. Installation of ICC is slightly more complicated, you can download it directly from intel’s website which is free download for non-commercial use. Archlinux and Gentoo both have packaged installer. On ubuntu/debian system you probably also need build-essential and apt-build to rebuilt packages. On archlinux you will need base-devel and abs.
For most packages, the following bash script can be used before configuration/make step. Don’t ommit the dot on first line and change the path of iccvars.sh to your installation directory.
. /opt/intel/Compiler/11.0/081/bin/iccvars.sh intel64 CC=icc CFLAGS="-xHOST -O3 -no-prec-div " LD=xild AR=xiar CXX=icpc CXXFLAGS="-xHOST -O3 -no-prec-div " LDFLAGS=-ltcmalloc_minimal export CC CFLAGS LD AR CXX CXXFLAGS LDFLAGS
These setting seems safe for all packages. Here is a summary of package specific cflags setting.
| Mysql | Cherokee | Nginx | Varnish | PHP | Memcached | |
|---|---|---|---|---|---|---|
| -static | No | No | No | No | N/A | No |
| -ipo | No | No | Yes | No | N/A | Yes |
| LDFLAGS=-ltcmalloc_minimal | Yes | Yes | Yes | Yes | Yes | Yes |
| configure option | –disable-shared –with-mysqld-libs=-ltcmalloc_minimal | None | None | –disable-jemalloc | Failed with ICC | None |
This might disappoint you. But the rebuilt software stacks show no improvement whatsoever in my benchmark.
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