Re: [OT] ab and load testing

[Christopher Schultz <ch...@christopherschultz.net>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Rainer,

On 5/25/13 1:49 AM, Rainer Jung wrote:
> On 24.05.2013 17:54, Christopher Schultz wrote:
> 
>> Top reported that Tomcat was taking somewhere between 550-600%
>> CPU. (This is a 4-core hyperthreaded CPU so I have 8 logical
>> cores. 'ab' was taking about 100% CPU so I think 600% CPU means
>> it was roughly pegging 6 of my logical cores. Roughly 30% system,
>> 60% user CPU usage.).
> 
> The 100% CPU for "ab" indicates that "ab" was your bottleneck.

Interesting.

> AFAIK "ab" is single threaded async, so it can handle multiple
> parallel connections but will max out on one consumed CPU core. If
> you want to go further, you would have to start multiple "ab" in
> parallel.

Or just use JMeter, but at some point I will have client and server
fighting each other, as everything is on localhost.

> Since you are close to a CPU saturated system, in this specific
> case you might not get much further, but 17454 requests/sec isn't
> that bad either :)

Honestly, I was hoping for more, but I'm not really sure why... 1.4B
requests/day is pretty good for a laptop! Also note that these were
100% static content, so we're mostly talking about fopen and
read/write operations... nothing terribly exciting.

- -chris
-----BEGIN PGP SIGNATURE-----
Version: GnuPG/MacGPG2 v2.0.17 (Darwin)
Comment: GPGTools - http://gpgtools.org
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
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=4h5m
-----END PGP SIGNATURE-----

---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org