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Problems under load? [message #4169]

Wed, 17 July 2002 15:45

ctbk

Messages: 142
Registered: April 2002
Location: Milan, Italy

Karma:

Senior Member

I've installed a copy of Fudforum (2.2.0) and I've filled the DB to make some test the behaviour of fud under load.

I'm using autobench, which is just a script calling httperf.

A part from the fact that time taken to create a page grows in an exponential way when increasing (linarly) the number of simultaneous connections (but I suspect it's a mysql issue...)
I've noticed that when the simultaneous connections are 8 or more the forum stops working and I get this error message:

query failed: %( INSERT INTO fud2_ses (ses_id,time_sec,data,sys_id,user_id) VALUES('114d6f32b8d784b7e43c495c88cc5022',1026919930,'', 'e7e6f93e3004e84599e5607ce4b8d58d',2000013715) )% because %( Duplicate entry '2000013715' for key 2 )%

To try to stress the forum the URL I keep calling refers to a thread with 50 replies or so.

When I stop autobench, the forum returns to normality and works again.

Regarding the growth of pages' creation time, here it's the trend I've noticed:

2 req/sec ~ 200ms
4 req/sec ~1200ms
6 req/sec ~2500ms
8 req/sec ~4300ms
10 req/sec ~8300ms

My server is using Linux 2.4.4 (quite old indeed) and MySQL 3.23.42

Later,
Ste

~
~
:wq

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[Message index]

		Problems under load? By: ctbk on Wed, 17 July 2002 15:45
		Re: Problems under load? By: Ilia on Wed, 17 July 2002 17:14
		Re: Problems under load? By: ctbk on Thu, 18 July 2002 08:10
		Re: Problems under load? By: Ilia on Thu, 18 July 2002 11:32
		Re: Problems under load? By: ctbk on Fri, 19 July 2002 08:42
		Re: Problems under load? By: Ilia on Mon, 29 July 2002 20:00
		Re: Problems under load? By: ctbk on Tue, 30 July 2002 07:05
		Re: Problems under load? By: Ilia on Tue, 30 July 2002 11:23

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