tomcat-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Bill Barker" <>
Subject Re: Initial apr results
Date Thu, 02 Jun 2005 14:29:17 GMT
You might also want to dig up Peter's JMeter test plan.  This one is the 
opposite of the 'ab' test, in that it tests the ability to handle a lot of 
socket connections without necessarily much throughput.

As Remy said, the 'ab -k' tests should be close unless either your JVM 
vendor or your APR implementation s*cks.  Both connectors do much the same 
thing with this test execpt for sendfile (and 'tomcat.gif' is too small to 
for Tomcat to use sendfile by default).

----- Original Message ----- 
From: "Tim Funk" <>
To: "Tomcat Developers List" <>
Sent: Thursday, June 02, 2005 3:41 AM
Subject: Re: Initial apr results

> Excellent. In my future tests, I'll keep the concurrency lower and the 
> hits higher. I'll also use different size files. I am only able to use a 
> 1.4.2 JVM. I might be able to get 1.5 on - but its highly doubtful.
> -Tim
> Remy Maucherat wrote:
>> Tim Funk wrote:
>>> My test box was an HP-UX 9000/800/L1000-44 - Dual CPU (440 MHz)
>>> On my initial tests with the APR connector - the APR connector "seemed" 
>>> slower the "old" http connector. But the difference is mild and my 
>>> initial numbers are flaky. On the same hardware - I am running 6 other 
>>> instances (of different versions) of tomcat at the same time which may 
>>> be throwing my numbers off.
>>> During some slow time - I might be able to take most of them down and 
>>> run some more tests to try to ensure I am hogging all the resources to 
>>> the box and not sharing them.
>>> For those curious - for /tomcat.gif - my requests per second range 
>>> anywhere from 1200+ to 5000+ - Due to such a large range - I have no 
>>> confidence in my numbers so far to reach any conclusion.
>>> I was using the command:
>>>  /usr/local/httpd/bin/ab -n 1000 -c 100 -k 
>>> http://myserver:8090/tomcat.gif
>>> With keepalive off - I was still easily over 1000 requests per second 
>>> for tomcat.gif.
>> I can't assert yet that there are no bugs at the moment (performance or 
>> otherwise). So far, performance seems good on Windows, and Linux. To give 
>> a comparison on Windows with this test, APR HTTP is within 5% of regular 
>> HTTP, and gets closer depending on the JVM (I suppose if it's better at 
>> JNI - I've noticed slightly better results with Sun JDK 1.5 Server 
>> compared to 1.4.2 client).
>> I think you should use -n 20000 at least: if the test duration is too 
>> small, ab is going to produce random results. In this test, increasing 
>> concurrency isn't particularly useful either.
>> Obviously, the results of this kind of testing are not really important 
>> as long as the results stay relatively close (for example, I think 
>> the -25% result I got when using polling exclusively was really good).
> ---------------------------------------------------------------------
> To unsubscribe, e-mail:
> For additional commands, e-mail:

This message is intended only for the use of the person(s) listed above as the intended recipient(s),
and may contain information that is PRIVILEGED and CONFIDENTIAL.  If you are not an intended
recipient, you may not read, copy, or distribute this message or any attachment. If you received
this communication in error, please notify us immediately by e-mail and then delete all copies
of this message and any attachments.

In addition you should be aware that ordinary (unencrypted) e-mail sent through the Internet
is not secure. Do not send confidential or sensitive information, such as social security
numbers, account numbers, personal identification numbers and passwords, to us via ordinary
(unencrypted) e-mail.

View raw message