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 <[EMAIL PROTECTED]> 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
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