Re: Can I find out what webapps resin is running?

Hi Bill,

Sorry it took me so long to respond.

Bill Au wrote:
> What useful information are you getting out of Scottit 3.1 that is not 
> available in ResinStatusServlet?

We were experiencing a slow down with our Web site, and yet I couldn't 
find any reason for it.  All of the physical resources, like server CPU 
performance, network performance, memory consumption, database 
connections, etc. did not show a problem.  When I ran Scottit 3.1, I 
found the problem.  The critical information was this:  active sessions 
and active threads.  Before Scottit, I had no way to see the active 
sessions and threads in production in real time.  My problem ended up 
being the max-threads were way too low.  I quadrupled the limit and 
solved my problem.

There is also tons of other useful stuff.  I can see a thread dump in 
real time without having to perform a special command, sending an 
interrupt to the server.

I can see the total memory and with a Java applet I can watch the 
garbage collections.  But, If you really want to see the whole memory 
picture, I recommend using jconsole instead.

Since I was having memory problems about 6 months ago, I currently log 
all GCs to a file so I can monitor it on a daily basis.

I can also monitor the DB connection pools.

> 
> In the pre-release version that I had looked at, the GC information 
> reported in the memory section was not accurate.  They don't match up 
> with numbers reportes by the platform MBean or the -Xloggc output.  I 
> was very disappointed to see that in the official release, the gc info 
> was removed completely instead of being fixed.

I haven't performed a comparison of the memory section with the GC log 
entries that are written to a log file so I can't comment on that.

Overall, It provides a lot of information about a running Resin server 
and the applications that are running on it.  I didn't have to write any 
custom code to get it.  And to top it all off, the developers are not 
currently charging a fee to use it.  Can't beat it.

Take care,
Keith


> 
> Throughput was still "Under construction" before and it is now also gone.
> 
> Bill
> 
> On 6/14/06, *Keith Fetterman* <[email protected] 
> <mailto:[email protected]>> wrote:
> 
>     I highly recommend Scottit 3.1.
> 
>     http://www.ustobe.com/scottit/
> 
>     It rocks because it provides a lot of information about the running
>     Resin server and the applications that are running.
> 
>     David Campbell wrote:
>      > Andy Yates wrote:
>      >> Just a quickie. Apart from performing an ls on the webapps directory
>      >> is there anyway I can query a Resin server to tell me what
>     webapps it
>      >> is currently hosting (by name).
>      >>
>      >> i.e. If I have 4 apps called app, foo, bar, test can I get a webpage
>      >> up which says "Currently hosting app, foo, bar, test".
>      >>
>      >> I'm not about the status of the app just what its got.
>      >
>      > resin-status
>      >
>      > http://www.caucho.com/resin-3.0/jmx/servlet.xtp
>      >
> 
> 
>