Why is MySQL nearly twice as fast on Linux?

[David Xu]

Daniel Eischen wrote:

>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.
>  
>
Innodb still wins big because it supports transaction and
logs everything. it is a bit out of topic...


>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
>
>  
>