no; We run sar and capture data every 5 seconds.
- Original Message
From: Tomcat Users List users@tomcat.apache.org
To: Tomcat Users List users@tomcat.apache.org, Lists
[EMAIL PROTECTED]
Subject: Re: CPU usage quirk with multiple tomcat instances
Date: 08/05/08 10:21
but sar
we use sar and look at cpu utilisation..
- Original Message
From: Tomcat Users List users@tomcat.apache.org
To: Tomcat Users List users@tomcat.apache.org
Subject: Re: CPU usage quirk with multiple tomcat instances
Date: 07/05/08 08:13
btw, how do you measure it? vmstats? top
Users List users@tomcat.apache.org
Subject: Re: CPU usage quirk with multiple tomcat instances
Date: 07/05/08 08:13
btw, how do you measure it? vmstats? top?
On Wed, May 7, 2008 at 9:40 AM, Dan Keeley lt;[EMAIL PROTECTED]gt;
wrote:
gt; We dont have synchronisation issues - I've already
that is correct, i was just looking for why!
Dan
- Original Message -
From: Leon Rosenberg [EMAIL PROTECTED]
To: Tomcat Users List users@tomcat.apache.org; Lists
[EMAIL PROTECTED]
Sent: Tuesday, May 06, 2008 9:33 AM
Subject: Re: CPU usage quirk with multiple tomcat instances
Hello Dan
btw, how do you measure it? vmstats? top?
On Wed, May 7, 2008 at 9:40 AM, Dan Keeley [EMAIL PROTECTED] wrote:
We dont have synchronisation issues - I've already profiled extensively with
jprofiler.. Well we did, but after using jprofiler we dont :)
Err, I think our app is the same as yours
Message
From: Tomcat Users List users@tomcat.apache.org
To: Tomcat Users List users@tomcat.apache.org
Subject: Re: CPU usage quirk with multiple tomcat instances
Date: 04/05/08 12:49
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Hash: SHA1
Da,
Lists wrote:
|gt; My guess (and that's all
Hello Dan,
what also may happening is that you have unneeded or errorneous
synchronisation somewhere in your code. Two instances : less code in
same block and vm, effectively less synchronization.
try to profile whether some use cases take longer on the single tomcat
per machine.
We once tried
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Da,
Lists wrote:
| My guess (and that's all it is) is that you have eliminated much of the
| context-switching overhead that two instances would have compared to one.
|
| Ah I see. I guess i can look at that with mpstat and look at things like
|
Hi,
We have a Tomcat app that is loadbalanced by hardware. I have 4 boxes
available in our test env, all of which vary slightly but not massively in
spec.
Anyway I moved from 2 tomcat instances on each machine ( listening on
different ports ) down to 1 and I noticed for the same load the cpu
Lists wrote:
Hi,
We have a Tomcat app that is loadbalanced by hardware. I have 4 boxes
available in our test env, all of which vary slightly but not massively in
spec.
Anyway I moved from 2 tomcat instances on each machine ( listening on
different ports ) down to 1 and I noticed for the same
My guess (and that's all it is) is that you have eliminated much of the
context-switching overhead that two instances would have compared to one.
Ah I see. I guess i can look at that with mpstat and look at things like
thread migrations etc. Important because if we install more CPU's i guess
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