Re: strange shared arena size bahaviour

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Angus Dorbie (dorbie++at++sgi.com)
Wed, 04 Aug 1999 09:19:42 -0700

There is no easy answer, and a couple of issues you must consider.

The arena must be contiguous in virtual address space and the loading of
various dso's can adversely affect the arena growth.

Making the arena large to begin with is helpfull but remember it grows
by doubling so you may see counterintuitive results if you don't bear
this in mind.

You should check the archives for detailed information on moving DSO's
to support large databases. It seems like those cases are a pretty good
match with yours.

Cheers,Angus.

Klaus Otto wrote:
>
> Hi,
>
> I'm trying to load a MultiGen database of about 500MB of flt-files
> into perfly on a 512 MB Memory Onyx2 IR, Irix 6.52.
>
> After a while, perfly terminates telling me:
> unable to allocate x bytes from arena ...
>
> I increased PFSHAREDSIZE and swap space on disk with some strange
> results given in the list below:
>
> HDisk swap PFSHAREDSIZE Terminated at
> 2.5 gb 1950000000 962000 kB
> 2.5 gb 1999999000 976000 kB
> 2.5 gb 2500000000 610351 kB
> 2.5 gb 1000000000 976000 kB
> 1.5 gb 1999999000 976000 kB
> 3.5 gb 2500000000 870993 kB
> 3.5 gb 2200000000 934246 kB
>
> It sometimes looks like decreasing the PFSHAREDSIZE gives more space.
>
> I know from the achives that this has been topic several times,
> but none of those cases seem to match this one.
>
> Thank you in advance,
>
> Klaus
> ------------------------------------------------------
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