You are viewing a plain text version of this content. The canonical link for it is here.
Posted to users@tomcat.apache.org by Peter Lin <tc...@yahoo.com> on 2004/03/04 14:49:06 UTC
tomcat monitor plugin for JMeter
Some people already know this, but most don't. I am working on a monitor for Tomcat using JMeter. The first graph will be the status. I made a mockup in photoshop. The actual UI hasn't been coded yet. I'd like to hear people's thoughts and comments.
http://cvs.apache.org/~woolfel/server-monitors-status-mockup.jpg
Here is how I am calculating the load. It is a combination of memory and thread.
memory load = (used memory/ max memory) * load factor
the default load factor is 33
thread load = (busy threads/ max threads) * load factor
the default load factor is 67
tomcat load = memory load + thread load
I plan to store the load factor in JMeter's properties file, so users can change the value. There are numerous limitation to this approach that I can think of, but I'm sure others can think of other limitations.
1. a small number of threads could be taking 100% of the CPU, like XML. which would mean both memory and thread don't tell you accurate what the load is
2. a large number of concurrent requests for static files may not place load on the system
3. memory usage could be high, but the system may be responding within acceptable ranges
The load calculation at this point is at a high level, but I feel it is still useful. Ultimately the load calculation will have to be specific to the actual webapps. Since JMeter and the new monitor will be extensible, users should be able to provide their own class to calculate load. Once I get a working version done. I can't say when it will get done, but I am actively working on it.
peter lin
---------------------------------
Do you Yahoo!?
Protect your identity with Yahoo! Mail AddressGuard
Re: tomcat monitor plugin for JMeter
Posted by Peter Lin <tc...@yahoo.com>.
I've commited the first set of icons for the monitor, for those who are curious. please email me directly with comments. the icons start with "monitor"
http://cvs.apache.org/viewcvs.cgi/*checkout*/jakarta-jmeter/src/core/org/apache/jmeter/images/monitor-load-8.gif?rev=1.1
peter lin
---------------------------------
Do you Yahoo!?
Yahoo! Search - Find what you�re looking for faster.
Re: tomcat monitor plugin for JMeter
Posted by Peter Lin <tc...@yahoo.com>.
I prefer to have a general simple calculation for health, rather than multiple tiers of warnings. The other thought I had for warning is:
(busy/max) > 75%
peter lin
Antonio_Fiol_Bonn�n <fi...@terra.es> wrote:
Hi,
I would establish two thresholds (possibly in %). Or maybe one threshold
could be "spare" and the other "spare/4" or something.
max == busy seems too high for a simple "warning". Apache web server
prints an "error" (not a warning IIRC) on the logs if MaxClients is reached.
Or maybe I dod not unserstand your proposal...
Antonio Fiol
Peter Lin wrote:
>
>Here is a bit more information on how I am implementing the monitor. to calculate the health I am using max, busy and spare threads.
>
>healthy = ( max - busy) > spare
>active = (max - busy) < spare
>warning = (max == busy)
>
>
>Do people think that is reasonable?
>
>peter lin
>
>
>Peter Lin wrote:
>
>Some people already know this, but most don't. I am working on a monitor for Tomcat using JMeter. The first graph will be the status. I made a mockup in photoshop. The actual UI hasn't been coded yet. I'd like to hear people's thoughts and comments.
>
>http://cvs.apache.org/~woolfel/server-monitors-status-mockup.jpg
>Here is how I am calculating the load. It is a combination of memory and thread.
>
>memory load = (used memory/ max memory) * load factor
>the default load factor is 33
>
>thread load = (busy threads/ max threads) * load factor
>the default load factor is 67
>
>tomcat load = memory load + thread load
>
>I plan to store the load factor in JMeter's properties file, so users can change the value. There are numerous limitation to this approach that I can think of, but I'm sure others can think of other limitations.
>
>1. a small number of threads could be taking 100% of the CPU, like XML. which would mean both memory and thread don't tell you accurate what the load is
>
>2. a large number of concurrent requests for static files may not place load on the system
>
>3. memory usage could be high, but the system may be responding within acceptable ranges
>
>The load calculation at this point is at a high level, but I feel it is still useful. Ultimately the load calculation will have to be specific to the actual webapps. Since JMeter and the new monitor will be extensible, users should be able to provide their own class to calculate load. Once I get a working version done. I can't say when it will get done, but I am actively working on it.
>
>peter lin
>
>
>
>---------------------------------
>Do you Yahoo!?
>Protect your identity with Yahoo! Mail AddressGuard
>
>---------------------------------
>Do you Yahoo!?
>Yahoo! Search - Find what you�re looking for faster.
>
>
> ATTACHMENT part 2 application/x-pkcs7-signature name=smime.p7s
---------------------------------
Do you Yahoo!?
Yahoo! Search - Find what you�re looking for faster.
Re: tomcat monitor plugin for JMeter
Posted by Antonio Fiol Bonnín <fi...@terra.es>.
Hi,
I would establish two thresholds (possibly in %). Or maybe one threshold
could be "spare" and the other "spare/4" or something.
max == busy seems too high for a simple "warning". Apache web server
prints an "error" (not a warning IIRC) on the logs if MaxClients is reached.
Or maybe I dod not unserstand your proposal...
Antonio Fiol
Peter Lin wrote:
>
>Here is a bit more information on how I am implementing the monitor. to calculate the health I am using max, busy and spare threads.
>
>healthy = ( max - busy) > spare
>active = (max - busy) < spare
>warning = (max == busy)
>
>
>Do people think that is reasonable?
>
>peter lin
>
>
>Peter Lin <tc...@yahoo.com> wrote:
>
>Some people already know this, but most don't. I am working on a monitor for Tomcat using JMeter. The first graph will be the status. I made a mockup in photoshop. The actual UI hasn't been coded yet. I'd like to hear people's thoughts and comments.
>
>http://cvs.apache.org/~woolfel/server-monitors-status-mockup.jpg
>Here is how I am calculating the load. It is a combination of memory and thread.
>
>memory load = (used memory/ max memory) * load factor
>the default load factor is 33
>
>thread load = (busy threads/ max threads) * load factor
>the default load factor is 67
>
>tomcat load = memory load + thread load
>
>I plan to store the load factor in JMeter's properties file, so users can change the value. There are numerous limitation to this approach that I can think of, but I'm sure others can think of other limitations.
>
>1. a small number of threads could be taking 100% of the CPU, like XML. which would mean both memory and thread don't tell you accurate what the load is
>
>2. a large number of concurrent requests for static files may not place load on the system
>
>3. memory usage could be high, but the system may be responding within acceptable ranges
>
>The load calculation at this point is at a high level, but I feel it is still useful. Ultimately the load calculation will have to be specific to the actual webapps. Since JMeter and the new monitor will be extensible, users should be able to provide their own class to calculate load. Once I get a working version done. I can't say when it will get done, but I am actively working on it.
>
>peter lin
>
>
>
>---------------------------------
>Do you Yahoo!?
>Protect your identity with Yahoo! Mail AddressGuard
>
>---------------------------------
>Do you Yahoo!?
>Yahoo! Search - Find what you’re looking for faster.
>
>
Re: tomcat monitor plugin for JMeter
Posted by Peter Lin <tc...@yahoo.com>.
Here is a bit more information on how I am implementing the monitor. to calculate the health I am using max, busy and spare threads.
healthy = ( max - busy) > spare
active = (max - busy) < spare
warning = (max == busy)
Do people think that is reasonable?
peter lin
Peter Lin <tc...@yahoo.com> wrote:
Some people already know this, but most don't. I am working on a monitor for Tomcat using JMeter. The first graph will be the status. I made a mockup in photoshop. The actual UI hasn't been coded yet. I'd like to hear people's thoughts and comments.
http://cvs.apache.org/~woolfel/server-monitors-status-mockup.jpg
Here is how I am calculating the load. It is a combination of memory and thread.
memory load = (used memory/ max memory) * load factor
the default load factor is 33
thread load = (busy threads/ max threads) * load factor
the default load factor is 67
tomcat load = memory load + thread load
I plan to store the load factor in JMeter's properties file, so users can change the value. There are numerous limitation to this approach that I can think of, but I'm sure others can think of other limitations.
1. a small number of threads could be taking 100% of the CPU, like XML. which would mean both memory and thread don't tell you accurate what the load is
2. a large number of concurrent requests for static files may not place load on the system
3. memory usage could be high, but the system may be responding within acceptable ranges
The load calculation at this point is at a high level, but I feel it is still useful. Ultimately the load calculation will have to be specific to the actual webapps. Since JMeter and the new monitor will be extensible, users should be able to provide their own class to calculate load. Once I get a working version done. I can't say when it will get done, but I am actively working on it.
peter lin
---------------------------------
Do you Yahoo!?
Protect your identity with Yahoo! Mail AddressGuard
---------------------------------
Do you Yahoo!?
Yahoo! Search - Find what you�re looking for faster.