no; We run sar and capture data every 5 seconds.
- Original Message
From: Tomcat Users List
To: Tomcat Users List , Lists
<[EMAIL PROTECTED]>
Subject: Re: CPU usage quirk with multiple tomcat instances
Date: 08/05/08 10:21
> but sar only shows you 10 minute averag
To: Tomcat Users List
> 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 <[EMAIL PROTECTED]>
> wrote:
>> > We dont have
we use sar and look at cpu utilisation..
- Original Message
From: Tomcat Users List
To: Tomcat Users List
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 9:4
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 y
guess
that is correct, i was just looking for why!
Dan
- Original Message -
From: "Leon Rosenberg" <[EMAIL PROTECTED]>
To: "Tomcat Users List" ; "Lists"
<[EMAIL PROTECTED]>
Sent: Tuesday, May 06, 2008 9:33 AM
Subject: Re: CPU usage quirk with mul
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 t
- Original Message
From: Tomcat Users List
To: Tomcat Users List
Subject: Re: CPU usage quirk with multiple tomcat instances
Date: 04/05/08 12:49
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> Da,
>
> Lists wrote:
> |> My guess (and that's a
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Hash: SHA1
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
| t
> 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 gues
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 l
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
uti
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