Well, looks like I found the culprit.
Increasing thread_cache_size from 0 to 50 totally alleviated the stress
(both on the database and our clients). Recommended by the manual,
of course.
For list-archival's sake:
FreeBSD 4.3-STABLE
/etc/my.cnf:
[mysqld]
user=mysql
set-variable = wait_timeout=3600
set-variable = tmp_table_size=8000000
set-variable = max_connections=500
set-variable = table_cache=256
set-variable = sort_buffer=4M
set-variable = key_buffer=64M
set-variable = thread_cache_size=50
top:
CPU states: 66.3% user, 0.0% nice, 30.2% system, 3.1% interrupt, 0.4% idle
Mem: 33M Active, 92M Inact, 29M Wired, 8368K Cache, 35M Buf, 87M Free
Swap: 1024M Total, 88K Used, 1024M Free
mytop (a great utiltiy, may I add) is reassuring:
Queries Total: 129,866 Avg/Sec: 450.92 Slow: 0
Threads Total: 3 Active: 1 Cached: 48
Key Efficiency: 99.73% Bytes in: 16,118,135 Bytes out: 26,368,181
Unfortunately, the application does make a new connection for every
hit, which is why thread_cache_size probably made a difference.
Out of curiousity, what was different about 3.22?
Anyway, Thanks to all who responded.
> We upgraded our convergent e-business enterprise database server from mysql
> 3.22 to 3.23 yesterday. The upgrade process itself was smooth and
> sexy.
>
> Unfortunately, the dbms is overall slower for us. What's worse,
> some maintenance scripts are losing their connections in the
> middle of their runs.
>
> I have indeed read the appropriate section in the manual for upgrading
> from 3.22 to 3.23.
>
> I have a number of hunches as to where I could start, but I was just
> wondering if there is anything I should be aware of that may save
> me some time ("You idiot, mysql 3.23 introduced a turbo switch. It's
> just off by default").
>
--
Michael Bacarella <[EMAIL PROTECTED]>
Technical Staff / System Development,
New York Connect.Net, Ltd.
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