> Does this sound like fixing the wrong problem?
Yes. Put a reverse proxy in front of your server, tune MaxClients so
you won't go into swap, and then benchmark to see how much load you can
handle. Then think about tuning.
Thanks for replying...
I have put a reverse procy in front of my mod_perl servers and I have set
MaxClient to 30. I have tried setting it to 50, but it slows down the
response time.
This is what top gave me when I hammered the test server with httperf:
----------
top - 17:24:27 up 34 days, 9:01, 4 users, load average: 20.67, 12.84,
9.26
Tasks: 142 total, 7 running, 135 sleeping, 0 stopped, 0 zombie
Cpu(s): 88.7% us, 7.6% sy, 0.0% ni, 0.0% id, 2.0% wa, 0.0% hi, 1.7% si
Mem: 906736k total, 359464k used, 547272k free, 6184k buffers
Swap: 3036232k total, 111564k used, 2924668k free, 17420k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
22802 www-data 15 0 39664 35m 7968 S 30.7 4.0 0:05.02 apache-perl
22370 www-data 16 0 39664 35m 7968 S 12.8 4.0 0:03.45 apache-perl
13604 www-data 17 0 40096 35m 7968 R 5.7 4.0 0:30.93 apache-perl
15424 root 15 0 32060 7668 1560 S 3.8 0.8 6:49.47 memcached
13611 www-data 15 0 40036 35m 7968 S 3.5 4.0 0:17.13 apache-perl
22804 www-data 17 0 39664 35m 7968 R 3.1 4.0 0:03.01 apache-perl
13612 www-data 16 0 40032 35m 7968 S 0.7 4.0 0:33.38 apache-perl
------------
I ran httperf to create 50 connections. This is the result:
1 connections per second -> avg reply time = 103953.7 ms
10 connections per second -> avg reply time = 123167.2 ms
20 connections per second -> avg reply time = 121483.7 ms
30 connections per second -> avg reply time = 114411.3 ms
40 connections per second -> avg reply time = 130168.7 ms
50 connections per second -> avg reply time = 130457.4 ms
When only creating 1 connection, the avg reply time = 3289.4 ms
When creating 10 connections, with 1 conn per second, the avg reply time =
25929.7 ms
I have no idea where to start fixing this. It seems that the more connection
there is, the higher the avg reply time.
Does anyone ever experienced this? Why does it happen?
Basically I just want to make my webapp ready to launch... (doesn't anyone?)
THANK YOU...
---
Badai Aqrandista
Cheepy (?)
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