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20060106: Problem loading certian model displays with Fedora Core 4 (foo.out file)

>From: Jacob <address@hidden>
>Organization: 
>Keywords: 200601062238.k06Mcq7s001762 IDV memory

Hi Jacob-

>       I just wanted to mention one thing also about the memory build up from
>loading 3 or 4 different data displays in IDV.  When I would of course
>load a 5 image loop of the GOES-East 10.7 um IR CONUS, the memory status
>in the lower right corner of the screen would go up to about 134 MB.
>Well, then I would load a couple of other displays, like water vapor,
>radar, etc.  When I add on these displays, the memory status increases
>to about 361 MB.  Then I wanted to see what would happen if I loaded a
>display on top of all that which would increase that memory status only
>a slight bit, so I loaded a NEXRAD 5-image loop of Raleigh, NC.  When I
>went to create the display for the NEXRAD image loop, which would
>increase the memory usage only a small bit from 361 MB, IDV shut down
>and the program terminated.  When I looked at the terminal window from
>where I loaded the IDV, there was one line added which said:
>
> ./runIDV: line 24: 17388 Killed                  ./jre/bin/${command}

How much swap space do you have on that machine?  I've seen the
IDV become sluggish when it reaches the point where it has to
swap memory, but I haven't seen it crash.

>       Would this have anything to do with our problem with trying to display
>the 3D models?  I thought it was interesting for this to happen.  Could
>this be a sign that IDV will only allow a limited amount of memory
>usage?  When I used IDV on Windows XP, it would allow me to go all the
>way up to 530 MB.  I had 512 MB of RAM, which is the same amount of
>memory I have on this computer, running Fedora Core 4.
>       Thank you again for all of your help and support.  God Bless.

If you only have 512 Mb of memory on the system, I would suggest
editing the runIDV script and lowering the amount of memory that
the IDV is using as I described in a previous e-mail.  You could
change:

command="java -Xmx512m -jar idv.jar $*"

to be:

command="java -Xmx300m -jar idv.jar $*"

You could experiment with the number that gives you the best 
performance.  

Don Murray
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