Hello,
Thanks for you help. You can see the results in the .err file below. I've
run it twice while the algorithm was running, but my knowledge in MySQL is
still too poor to identify any problem here. Beside these locks that I do
not know what they are.
This is the third release of the algorithm. The first release used stacks.
In a tree with 10 levels and an average of 2 children per node, it used to
take about 2 minutes since everything was running sequentially. When I
added the threads it went down to 30 seconds in total. Now the tree I have
has 38 levels and 8 average children per node. The total of threads will
be: Threads=(1^0)+(8^1)+(8^2)+..+(8^30) . Processed sequentially it will
take really long. I am limiting the number of threads in Ruby to 100,
which should represent almost 100 concurrent queries equal to the number
of connections. But the database is not responding as I expect. I am for
sure doing something wrong, but I do not know exactly what.
Thanks again for your answers,
This is the error log:
080627 12:06:38 mysqld_safe Starting mysqld daemon with databases from
/usr/local/mysql/data
080627 12:06:38 [Warning] Setting lower_case_table_names=2 because file
system for /usr/local/mysql/data/ is case insensitive
080627 12:06:38 InnoDB: Started; log sequence number 0 46409
080627 12:06:39 [Note] Event Scheduler: Loaded 0 events
080627 12:06:39 [Note] /usr/local/mysql/bin/mysqld: ready for connections.
Version: '5.1.25-rc' socket: '/tmp/mysql.sock' port: 3306 MySQL
Community Server (GPL)
Status information:
Current dir: /usr/local/mysql/data/
Running threads: 181 Stack size: 196608
Current locks:
lock: 0x107a854:
lock: 0x1074e54:
lock: 0x1071654:
lock: 0x1067854:
lock: 0x105d054:
lock: 0x1054c54:
lock: 0x1050c54:
lock: 0x1045654:
lock: 0x1040454:
lock: 0x103a454:
Key caches:
default
Buffer_size: 1719664640
Block_size: 1024
Division_limit: 100
Age_limit: 300
blocks used: 67
not flushed: 0
w_requests: 0
writes: 0
r_requests: 1456
reads: 67
handler status:
read_key: 153
read_next: 334
read_rnd 0
read_first: 3
write: 0
delete 0
update: 0
Table status:
Opened tables: 17
Open tables: 10
Open files: 20
Open streams: 0
Alarm status:
Active alarms: 180
Max used alarms: 181
Next alarm time: 28794
Begin safemalloc memory dump:
End safemalloc memory dump.
Events status:
LLA = Last Locked At LUA = Last Unlocked At
WOC = Waiting On Condition DL = Data Locked
Event scheduler status:
State : INITIALIZED
Thread id : 0
LLA : n/a:0
LUA : n/a:0
WOC : NO
Workers : 0
Executed : 0
Data locked: NO
Event queue status:
Element count : 0
Data locked : NO
Attempting lock : NO
LLA : init_queue:132
LUA : init_queue:142
WOC : NO
Next activation : never
Status information:
Current dir: /usr/local/mysql/data/
Running threads: 266 Stack size: 196608
Current locks:
lock: 0x107a854:
lock: 0x1074e54:
lock: 0x1071654:
lock: 0x1067854:
lock: 0x105d054:
lock: 0x1054c54:
lock: 0x1050c54:
lock: 0x1045654:
lock: 0x1040454:
lock: 0x103a454:
Key caches:
default
Buffer_size: 1719664640
Block_size: 1024
Division_limit: 100
Age_limit: 300
blocks used: 72
not flushed: 0
w_requests: 0
writes: 0
r_requests: 1785
reads: 72
handler status:
read_key: 188
read_next: 411
read_rnd 0
read_first: 3
write: 0
delete 0
update: 0
Table status:
Opened tables: 17
Open tables: 10
Open files: 20
Open streams: 0
Alarm status:
Active alarms: 265
Max used alarms: 279
Next alarm time: 28789
sh-3.2#
From:
mos <[EMAIL PROTECTED]>
To:
mysql@lists.mysql.com
Date:
26.06.2008 22:52
Subject:
Re: Performance problem with more than 500 concurrent queries
At 10:39 AM 6/26/2008, you wrote:
>Hello,
>
>thanks for the answer.
>
>Where is the error.log stored? I run the mysqladmin, it requires the
>password and it exits immediately. But I cannot find any error.log.
>
>Thanks,
>
>Guillermo
Guillermo,
Look in the \MySQL\Data\*.err file.
Also I don't know why you need to use threads. Why not just use a
stack instead, that way you need only 1 connection to MySQL. That's what
we
used to do when a programming language didn't have threads (back in the
old
days).
Mike
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