Description:
[mysqld]
datadir=/usr/local/db
skip-name-resolve
port=3308
user=mysql
log-bin=/usr/local/db/binlog
binlog-format="mixed"
slow_query_log=1
slow_query_log_file=/usr/local/db/slow.log
long_query_time=1
#innodb_direct_access_enable_binlog=1
--mysqld doesn't recognize the above option.
#daemon_memcached_enable_binlog="ON"
--is this option collaborative with the below option??
#loose-daemon_memcached_w_batch_size=301
--here is the point of this report:
When w_batch_size is set to 301 , To do memcache_add and memcache_delete 10000 key/value pairs with php, the performance is acceptable(700reqs/second), BUT , data integrity is broken from the "memcache get" command and "sql select" query.
no matter the tx_isolation default or set to READ-UNCOMMITED.
on the other hand, if the w_batch_size is set to 1 as default, the data integrity is ok, BUT , the performance of memcache_add becomes terrible(15~20reqs/second) .
How to repeat:
>Release: mysql-5.6.6-labs-april-2012 (Source distribution)
Modify CMakeLists.txt ,
OPTION(WITH_INNODB_MEMCACHED "" ON)
>C compiler: gcc (GCC) 4.4.6 20110731 (Red Hat 4.4.6-3)
>C++ compiler: c++ (GCC) 4.4.6 20110731 (Red Hat 4.4.6-3)
>Environment:
<machine, os, target, libraries (multiple lines)>
System: Linux db33 2.6.32-220.el6.x86_64 #1 SMP Tue Dec 6 19:48:22 GMT 2011 x86_64 x86_64 x86_64 GNU/Linux
Architecture: x86_64
Some paths: /usr/bin/perl /usr/bin/make /usr/bin/gmake /usr/bin/gcc /usr/bin/cc
GCC: Using built-in specs.
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-boo
tstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu
-unique-object --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.
0.0/jre --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-ppl --with-
cloog --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 4.4.6 20110731 (Red Hat 4.4.6-3) (GCC)
Compilation info (call): CC='/usr/bin/gcc' CFLAGS=' -Wall -O3 -g -fabi-version=2 -fno-omit-frame-pointer -fno-strict-aliasing -DDBUG_OFF' CXX='/usr/bin/c+
+' CXXFLAGS=' -Wall -Wno-unused-parameter -O3 -g -fabi-version=2 -fno-omit-frame-pointer -fno-strict-aliasing -DDBUG_OFF' LDFLAGS='' ASFLAGS=''
Compilation info (used): CC='/usr/bin/gcc' CFLAGS=' -Wall -O3 -g -fabi-version=2 -fno-omit-frame-pointer -fno-strict-aliasing -DDBUG_OFF' CXX='/usr/bin/c+
+' CXXFLAGS=' -Wall -Wno-unused-parameter -O3 -g -fabi-version=2 -fno-omit-frame-pointer -fno-strict-aliasing -DDBUG_OFF' LDFLAGS='' ASFLAGS=''
Start mysql as the above configuration [mysqld] , the rest steps are the same as
plugin/innodb_memcached/README-innodb_memcached .
and do the test php script,
<?php
echo time() ;
echo "\n" ;
$mh = memcache_connect("192.168.1.33", 11211);
for( $k=0 ; $k<10000 ; $k++ ) {
$v = $k . "value" ;
//memcache_delete($mh , $k );
memcache_add($mh , $k , $v , false, 0);
}
memcache_close($mh);
echo time();
echo "\n";
?>
Suggested fix:
maybe , let Innodb to do the transaction before starting the counting circle of daemon_memcached_w_batch_size ?
