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Re: Problems under load? [message #4236 is a reply to message #4208]

Fri, 19 July 2002 08:42

ctbk

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

Karma:

Senior Member

I didn't experience the 'dropping' of reply time you reported...
Don't know if it's a DB related thing (I use persistent connection and access through socket).

I've tested the 2.2.3 with a big db of user (~9000) and messages (~118.000).

I ran 2 tests: anonymous generation of the first page of a big thread (>70 msgs) and generation of a small thread (7 messages).
My machine is a dual PIII 1000 with 512MB RAM, connected in a 100Mb LAN. MySQL 3.23.42, Linux 2.4.18 .

Here are the results:

TEST 1: BIG Thread:

Req/sec    Mean Reply Time (ms)
1          111
2          111
4          111
6          111
8          112
10         120
12         126
14         500
16         3700
18         6000
20         8000

I think that up to 15/16 conn/sec the wait is acceptable.

TEST 2: SMALL Thread

Req/sec    Mean Reply Time (ms)
2          67
4          67
...        67
14         67
16         71
18         74
20         74
22         76
24         606
26         1300
28         1900
30         2447
32         2600
34         3278
36         4578
38         5036

Of course the thread pages are the most expensive to generate.

Assuming that one user (being pessimistic) requests 1 page every 15 seconds, and supposing all the threads are BIG... I calculated the following:

req/sec = (# users) * 1/15 (pages/sec)

If we assume 16 req/sec this means 240 CONTEMPORARY browsing users... but considering that not all the threads are so big, not all users are anonymous and not every request is relative to a thread page (from my experience the ratio threadpage/notthreadpage is 1/1, meaning that for every thread page there's one request relative to a not-thread page) I think the number can be much higher, let's say (on my HW) 300/350 users at the same time browsing and posting in the forum with acceptable waiting times.

Not bad Cool

Later,
Ste

~
~
:wq

[Updated on: Fri, 19 July 2002 09:13]

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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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