Why is MySQL nearly twice as fast on Linux?

[Daniel Eischen]

On Mon, 24 May 2004, Chris Elsworth wrote:

> On Mon, May 24, 2004 at 11:51:27AM -0400, Daniel Eischen wrote:
> > On Mon, 24 May 2004, Chris Elsworth wrote:
> > > 
> > > So, each of the smackfiles used below was changed to have sql_no_cache
> > > in the select. The _i smackfile simply has type=innodb in the create
> > > table statement.
> > 
> > I'm not a DB person; can you post a diff to the smackfile?

Thanks.  It wasn't clean; I had to also make mods to the smack
files to point to /tmp/mysql.sock instead of /var/lib/mysql/mysql.sock.
The source also needed tweaking (s/__FreeBSD/__FreeBSD__/ in
src/client.cc).  You also have to create /var/smack-data/.

Here's what I get on a dual 450MHz Xeon PIII (options
WITNESS and WITNESS_SKIPSPIN):

Run: super-smack ../smacks/select-key.smack 4 10000

DB_type    Query_type      num_queries max_time min_time q_per_s
-----------------------------------------------------------------
myisam     select_index    80000        4	  2	    348.56
innodb     select_index    80000        29	  2	    296.63

Run: super-smack ../smacks/update-select.smack 4 10000

DB_type    Query_type      num_queries  max_time  min_time  q_per_s
-----------------------------------------------------------------
myisam     select_index    40000        24	  2	    169.30 
           update_index    40000        8	  3	    169.30 
innodb     select_index    40000        5	  2	    164.64 
           update_index    40000        11	  1	    164.64 

I don't see much of a difference between myisam and innodb; the
former even seems to be faster for the select-key.smack test.
I'm using my-large.cnf settings in /etc/my.cnf (I have 512MB RAM):

[client]
port            = 3306
socket          = /tmp/mysql.sock

[mysqld]
port            = 3306
socket          = /tmp/mysql.sock
skip-locking
key_buffer = 256M
max_allowed_packet = 1M
table_cache = 256
sort_buffer_size = 1M
read_buffer_size = 1M
myisam_sort_buffer_size = 64M
thread_cache = 8
query_cache_size= 16M
thread_concurrency = 8
log-bin
server-id       = 1
innodb_flush_log_at_trx_commit = 0

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash

[isamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

-- 
Dan Eischen