In my experience writing programs for AIX that allocate memory, if you use
malloc
to allocate memory then susequently call free, the memory is put back within the
pool of memory that the program has available for subsequent calls to malloc;
the
process never deallocates the memory. The way to deallocate the memory so that
it
is available for other processes is to skip using malloc and make calls to sbrk
yourself and manage the memory yourself.
Perhaps ADSM simply uses malloc and suffers the same fate in that it does not
shrink between nightly backups. That being said, there should be no reason for
it
growing significantly after a night or two of backups.
Cheers...
Bruce
Steven P Roder wrote:
> On Wed, 5 May 1999, Dick Nieuwenhuizen wrote:
> > There is nothing wrong with the dsmsched.log file. The problem is the
> > running proces dsmc sched. When I'm looking with ps -elf the core image is
> > growing on several clients. After a restart of the scheduler on one client
> > the proces took only 1612 units instaed of the 50456 before the restart. Why
> > is it growing and what can I do to prevent it.
>
> I have observed this on the Solaris client also. When a backups starts,
> the server's view of the client as of the last backup is downloaded to the
> client, and stored in memory. This structure is then used to see what
> has changed, and what needs to be backed up. IMHO, the memory allocated
> for this structure is not freed when the backup completes, perhaps on
> purpose, perhaps not. I see this as either a bug, or poor design,
> depending on whether or not the retention of the memory was done on
> purpose, perhaps so that allocation for the next backup is not required?
>
> I have some clients that download upwards of 200M for a backup, so this is
> not an insignificant amount of memory.
>
> IBM, is my take on what is happening accurate? If so, could you please
> change the clients so that the memory is freed up when it is no longer
> needed?
>
> Thanks,
>
> Steve (unVMix Systems Programmer/Dude) Roder
> (tkssteve AT ubvm.cc.buffalo DOT edu | tkssteve AT acsu.buffalo DOT edu |
> (716)645-3564 ,
> | http://ubvm.cc.buffalo.edu/~tkssteve)
--
Bruce Elrick, Ph.D.
Bruce Elrick, Ph.D.
mailto:belrick AT home DOT com
http://members.home.net/belrick/
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