Why mysql 5.5 slower than 5.1 (linux,using mysqlslap)
- by Zenofo
my.cnf (5.5 and 5.1 is the same) :
back_log=200
max_connections=512
max_connect_errors=999999
key_buffer=512M
max_allowed_packet=8M
table_cache=512
sort_buffer=8M
read_buffer_size=8M
thread_cache=8
thread_concurrency=4
myisam_sort_buffer_size=128M
interactive_timeout=28800
wait_timeout=7200
mysql 5.5:
..mysql5.5/bin/mysqlslap -a --concurrency=10 --number-of-queries 5000
--iterations=5 -S /tmp/mysql_5.5.sock --engine=innodb
Benchmark
Running for engine innodb
Average number of seconds to run all queries: 15.156 seconds
Minimum number of seconds to run all queries: 15.031 seconds
Maximum number of seconds to run all queries: 15.296 seconds
Number of clients running queries: 10
Average number of queries per client: 500
mysql5.1:
..mysql5.5/bin/mysqlslap -a --concurrency=10 --number-of-queries 5000
--iterations=5 -S /tmp/mysql_5.1.sock --engine=innodb
Benchmark
Running for engine innodb
Average number of seconds to run all queries: 13.252 seconds
Minimum number of seconds to run all queries: 13.019 seconds
Maximum number of seconds to run all queries: 13.480 seconds
Number of clients running queries: 10
Average number of queries per client: 500
Why mysql 5.5 slower than 5.1 ?
BTW:I'm tried mysql5.5/bin/mysqlslap and mysql5.1/bin/mysqlslap,result is the same
