Another update with more data conflicting somewhat with my last report:

Shown by ps: 214560KB RSS
Shown by vmParameters (2,3): 64.6MB/67.4MB

A discrepancy of some 150MB.

Ken

On Thu, 2010-10-14 at 17:31 -0500, Ken Causey wrote:
> An update as things may not be quite as I originally described them.  It
> seems the values reported by vmParameters 2 and 3 are not as constant as
> I had been lead to believe.  I noticed that just a short while after
> sending the image the RSS had jumped up to 165800KB.  I still had VNC
> open on the image so I checked what is shown there and I see
> 145.6MB/147.7MB so there is still a discrepancy, but not perhaps as wide
> as I indicated.
> 
> I also did not mention that in addition to restarting Swazoo every 15
> minutes there is other cleanup that is done once a day related to
> statistics gathering that goes on.  My understanding is that this
> cleanup is meant to return things very close to the starting state.
> Perhaps Janko can comment on that more fully.
> 
> Ken
> 
> On Thu, 2010-10-14 at 16:55 -0500, Ken Causey wrote:
> > For some time now I've been bugging Janko about the memory usage of the
> > process that serves http://www.squeak.org/ .  I've gathered a bit more
> > info today and I'd like to see if anyone here has any thoughts.
> > 
> > First while there is some variation most of the Squeak processes that
> > serve squeak.org sites (source.squeak.org, map.squeak.org,
> > wiki.squeak.org) have a more or less constant and reasonable memory
> > usage.  Let me clarify that what I am talking about here is RSS
> > (Resident Set Size) as reported by ps/top on Linux.  Swiki as the oldest
> > of the group is the clear winner at just under 30MB, squeakmap is around
> > 47MB, and source.squeak.org is around 59MB.
> > 
> > In contrast immediately after starting it www.squeak.org is using about
> > 70MB and it grows from there.  Now a bit more than an hour since the
> > last restart it is already up to about 85MB.  I have seen it over 300MB
> > before, and it commonly uses 140-250MB.  It doesn't simply grow and
> > grow, it does shrink occasionally.
> > 
> > First, there is a known issue with Swazoo that it does not close sockets
> > correctly and Janko has addressed this by having Swazoo automatically
> > restarted every 15 minutes.  So using netstat for example I can watch
> > the socket count for the process continually grow and then it drops to
> > zero and this repeats.  In contrast for all the other process (all
> > running some variation of Kom/Comanche I believe) I'm hard pressed to
> > even catch a single open socket at any time (not counting the listener
> > that is).
> > 
> > Secondly, since I've been complaining about this issue for a long time
> > Janko has running a little morph that shows current memory usage.  What
> > this shows is the values of SmalltalkImage current vmParameterAt: 2 and
> > 3.  These numbers are quite stable.  For example at this moment these
> > are 68.3MB and 71.0MB respectively.  Whereas ps shows the RSS at
> > 85752KB.  Where is the discrepancy here?
> > 
> > My current theory is that the vmParameters are not reflecting incidental
> > memory use by the VM and plugins or that we are simply misinterpreting
> > the values.  Is it possible that Swazoo is failing to release something
> > that is causing the VM to use more memory than it should?
> > 
> > Note that the same VM is used by all of these processes.  It is
> > 
> > 3.8a-1 #1 Sun May  1 19:46:46 EDT 2005 gcc 3.3.5
> > 
> > Yes, I know it's old, but 'if it ain't broke, don't fix it' has been the
> > motto and with the possible exception of Swazoo/www.squeak.org it has
> > been working wonderfully for a long time now.
> > 
> > Your thoughts would be greatly appreciated,
> > 
> > Ken
> 
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