[IDV #SRS-784269]: PermGen error and memory issues

I think that sounds reasonable. Would you like me to post this conversation to 
readmine?

Sean

> Okay, I just checked and I'm running with 128m even on the session where
> I run with 10G of max heap on the mac.  We could have the default as 128
> and let the user set it to as low as 64 if they want.
> 
> Don
> 
> On 4/3/12 11:41 AM, Unidata IDV Support wrote:
> > I run 128 MB on my mac and haven't ran into any issues yet, but I'm sure 
> > you abuse your IDV a bit more than me :-)
> >
> > Sean
> >
> >> I'd have to run some tests to make sure 128 works on the mac.  It might
> >> need to be 256.
> >>
> >> Don
> >>
> >> On 4/3/12 11:01 AM, Unidata IDV Support wrote:
> >>> I wouldn't have a problem with 128 MB - I don't think it would hurt 
> >>> anything, although we should do some checks to make sure that the 
> >>> automagic memory management does not allocate too much memory for the 
> >>> edge cases when a user puts something like "Use 99% of available memory" 
> >>> in their system preferences.
> >>>
> >>> Sean
> >>>
> >>>> 64m does not work on a mac, so the default has to be 128.  What if that
> >>>> was the default for all OS's?
> >>>>
> >>>> Don
> >>>>
> >>>> On 4/3/12 10:00 AM, Unidata IDV Support wrote:
> >>>>> Hi Don,
> >>>>>
> >>>>> The default minimum for the JVM is 64 MB. I think as long as the IDV 
> >>>>> can startup at 64 MB, we set it to that. We can recommend that Mac 
> >>>>> users bump it up to 128 MB (or maybe we can edit the Mac installer to 
> >>>>> use 128 MB by default). I just think it would be nice to get this in 
> >>>>> the release. As far as git, if you'd like to sit down and go through a 
> >>>>> few "branch, hack, commit, push" cycles, I'd be happy to do so!
> >>>>>
> >>>>> Sean
> >>>>>
> >>>>>> Sean-
> >>>>>>
> >>>>>> The tricky think is what to use as a minimum.  I think that varies from
> >>>>>> system to system.  On the mac, it seems like 128 is a bare minimum.  
> >>>>>> And
> >>>>>> then you have to worry about how much total memory the user has.  I 
> >>>>>> have
> >>>>>> versions of runIDV and runIDV.bat which go along with the user
> >>>>>> preference.  I can send those to you if you want.  I'm not having fun
> >>>>>> with Git - otherwise, I'd make a branch. ;-)
> >>>>>>
> >>>>>> Don
> >>>>>>
> >>>>>> On 4/3/12 9:01 AM, Unidata IDV Support wrote:
> >>>>>>> Hi Don!
> >>>>>>>
> >>>>>>> I was (finally) looking into the PermGen stuff and noticed that you 
> >>>>>>> checked in some code back in December to handle this in the System 
> >>>>>>> Preference Tab, as well as code to handle saving the preference - 
> >>>>>>> awesome! I did some testing with jvisualvm to see how the PermGen 
> >>>>>>> space changed while abusing the IDV, and with 6 GB I was able to get 
> >>>>>>> 108 MB (I loaded about 20 or so bundles, has 12 views as well as data 
> >>>>>>> panels, etc.), so I would say 512 MB is a good upper limit. If you 
> >>>>>>> want, I can open a ticket on Redmine for discussion on the topic so 
> >>>>>>> that we can get your work in the tree...this will really help windows 
> >>>>>>> users, as they get a bit finicky when they have to edit the 
> >>>>>>> runIDV.bat script using admin privileges.
> >>>>>>>
> >>>>>>> Thanks!
> >>>>>>>
> >>>>>>> Sean
> >>>>>>>
> >>>>>>>> Hi Sean-
> >>>>>>>>
> >>>>>>>> Thanks for looking into this.  It's becoming more and more of an
> >>>>>>>> annoyance (especially on MacOS) and I'm surprised that no one has
> >>>>>>>> written in to complain (besides me).
> >>>>>>>>
> >>>>>>>> I've been using 256 and 512 (depending on how much memory I allocate 
> >>>>>>>> to
> >>>>>>>> the IDV which varies between 2 and 8 GB).
> >>>>>>>>
> >>>>>>>> I think we need to allow the user to set it through the system tab of
> >>>>>>>> the user preferences in case the default doesn't work.  I think 
> >>>>>>>> starting
> >>>>>>>> small (i.e. 128) would be fine and the UI could just be an editable
> >>>>>>>> combo box of 128, 256, 512 (editable so the user can type in their 
> >>>>>>>> own
> >>>>>>>> amount if they want).  The selected value would be used in the
> >>>>>>>> runIDV/runIDV.bat scripts.
> >>>>>>>>
> >>>>>>>> Let me know if you have any questions about how to implement this.
> >>>>>>>>
> >>>>>>>> Don
> >>>>>>>>
> >>>>>>>> On 10/7/11 2:02 PM, Unidata IDV Support wrote:
> >>>>>>>>> Don,
> >>>>>>>>>
> >>>>>>>>> What would be the downside of adding -XX:MaxPermSize=128m to 
> >>>>>>>>> runIDV? 128 MB seems to keep things under control on my system (I 
> >>>>>>>>> think the default is 64MB).
> >>>>>>>>>
> >>>>>>>>> Sean
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>> Hi-
> >>>>>>>>>>
> >>>>>>>>>> During the recent AAP workshop, we were running the IDV under 
> >>>>>>>>>> CentOS in
> >>>>>>>>>> a virtual machine set up under Oracle's Virtual Box.  The native 
> >>>>>>>>>> system
> >>>>>>>>>> had 2 GB of memory and the VM's were set up to allocate 1.5 GB.
> >>>>>>>>>>
> >>>>>>>>>> The first problem was that the IDV only allocated 512 MB of the 1.5
> >>>>>>>>>> available.  This caused problems loading satellite images and any 
> >>>>>>>>>> other
> >>>>>>>>>> raster data.
> >>>>>>>>>>
> >>>>>>>>>> The second issue was getting PermGen errors.  This seems to be 
> >>>>>>>>>> cropping
> >>>>>>>>>> up more and more.  At the very least, there should be an FAQ item 
> >>>>>>>>>> on
> >>>>>>>>>> this, but it might be useful to have a permgen setting in the 
> >>>>>>>>>> System tab
> >>>>>>>>>> of the Preferences so the users don't have to edit runIDV to 
> >>>>>>>>>> account for
> >>>>>>>>>> this.
> >>>>>>>>>>
> >>>>>>>>>> Don
> >>>>>>>>>> --
> >>>>>>>>>> Don Murray
> >>>>>>>>>> NOAA/ESRL/PSD and CIRES
> >>>>>>>>>> 303-497-3596
> >>>>>>>>>> http://www.esrl.noaa.gov/psd/people/don.murray/
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>> Ticket Details
> >>>>>>>>> ===================
> >>>>>>>>> Ticket ID: SRS-784269
> >>>>>>>>> Department: Support IDV
> >>>>>>>>> Priority: Critical
> >>>>>>>>> Status: Open
> >>>>>>>>>
> >>>>>>>>
> >>>>>>>> --
> >>>>>>>> Don Murray
> >>>>>>>> NOAA/ESRL/PSD and CIRES
> >>>>>>>> 303-497-3596
> >>>>>>>> http://www.esrl.noaa.gov/psd/people/don.murray/
> >>>>>>>>
> >>>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>> Ticket Details
> >>>>>>> ===================
> >>>>>>> Ticket ID: SRS-784269
> >>>>>>> Department: Support IDV
> >>>>>>> Priority: Critical
> >>>>>>> Status: Open
> >>>>>>>
> >>>>>>
> >>>>>> --
> >>>>>> Don Murray
> >>>>>> NOAA/ESRL/PSD and CIRES
> >>>>>> 303-497-3596
> >>>>>> http://www.esrl.noaa.gov/psd/people/don.murray/
> >>>>>>
> >>>>>>
> >>>>>
> >>>>>
> >>>>> Ticket Details
> >>>>> ===================
> >>>>> Ticket ID: SRS-784269
> >>>>> Department: Support IDV
> >>>>> Priority: Critical
> >>>>> Status: Open
> >>>>>
> >>>>
> >>>> --
> >>>> Don Murray
> >>>> NOAA/ESRL/PSD and CIRES
> >>>> 303-497-3596
> >>>> http://www.esrl.noaa.gov/psd/people/don.murray/
> >>>>
> >>>>
> >>>
> >>>
> >>> Ticket Details
> >>> ===================
> >>> Ticket ID: SRS-784269
> >>> Department: Support IDV
> >>> Priority: Critical
> >>> Status: Open
> >>>
> >>
> >> --
> >> Don Murray
> >> NOAA/ESRL/PSD and CIRES
> >> 303-497-3596
> >> http://www.esrl.noaa.gov/psd/people/don.murray/
> >>
> >>
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: SRS-784269
> > Department: Support IDV
> > Priority: Critical
> > Status: Open
> >
> 
> --
> Don Murray
> NOAA/ESRL/PSD and CIRES
> 303-497-3596
> http://www.esrl.noaa.gov/psd/people/don.murray/
> 
> 


Ticket Details
===================
Ticket ID: SRS-784269
Department: Support IDV
Priority: Critical
Status: Open