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#1 (**permalink**) 01-04-2008, 08:47 PM

I have read IBM documentation on rss , rss_hard and stack stack_hard
but unable to understand it.

If value of rss = 65536
rss_hard = 65536
stack = 32767
stack_hard = 32767
data = 491519
data_hard = 491519

for user vkgtry1

% ulimit -Ha
time(seconds) unlimited
file(blocks) unlimited
data(kbytes) 245760
stack(kbytes) 16384
memory(kbytes) 32768
coredump(blocks) 1000
nofiles(descriptors) 2500

Then what would be memory location / use effect of program / processed
used by user vkgtry1 under AIX 5.2 ML01?

Thanks,
VKG

#2 (**permalink**) 01-04-2008, 08:48 PM

Vikrant wrote:
> I have read IBM documentation on rss , rss_hard and stack stack_hard
> but unable to understand it.
>
> If value of rss = 65536
> rss_hard = 65536
> stack = 32767
> stack_hard = 32767
> data = 491519
> data_hard = 491519
>
> for user vkgtry1
>
> % ulimit -Ha
> time(seconds) unlimited
> file(blocks) unlimited
> data(kbytes) 245760
> stack(kbytes) 16384
> memory(kbytes) 32768
> coredump(blocks) 1000
> nofiles(descriptors) 2500
>
> Then what would be memory location / use effect of program / processed
> used by user vkgtry1 under AIX 5.2 ML01?
>
> Thanks,
> VKG

From the user hard limits:

physical memory = rss will be limited to 32MB for each process.
This includes code and data which is in memory.

stack, which is automatic data not from malloc, will be limited
to 16MB per process. Stack data does not have to be resident in
memory.

total data size (in memory and in VM) will be limited to 240MB
for each process.

The limits on any given system may be changed from the defaults
described in the IBM documentation. See /etc/security/limits

-- Jason

#3 (**permalink**) 01-04-2008, 08:49 PM

Jason Mather <goz02451@yahoo.com> wrote in message news:<3FAFBA5B.7040101@yahoo.com>...
> Vikrant wrote:
> > I have read IBM documentation on rss , rss_hard and stack stack_hard
> > but unable to understand it.
> >
> > If value of rss = 65536
> > rss_hard = 65536
> > stack = 32767
> > stack_hard = 32767
> > data = 491519
> > data_hard = 491519
> >
> > for user vkgtry1
> >
> > % ulimit -Ha
> > time(seconds) unlimited
> > file(blocks) unlimited
> > data(kbytes) 245760
> > stack(kbytes) 16384
> > memory(kbytes) 32768
> > coredump(blocks) 1000
> > nofiles(descriptors) 2500
> >
> > Then what would be memory location / use effect of program / processed
> > used by user vkgtry1 under AIX 5.2 ML01?
> >
> > Thanks,
> > VKG
>
> From the user hard limits:
>
> physical memory = rss will be limited to 32MB for each process.
> This includes code and data which is in memory.
>
> stack, which is automatic data not from malloc, will be limited
> to 16MB per process. Stack data does not have to be resident in
> memory.
>
> total data size (in memory and in VM) will be limited to 240MB
> for each process.
>
> The limits on any given system may be changed from the defaults
> described in the IBM documentation. See /etc/security/limits
>
> -- Jason

Hi Jason,
Thanks a lot for explaining to me. I would greatly appreciate, if you
or someone else could provide me good (I know it depends) values of
rss, rss_hard stack , stack_hard values for AIX 5.2.
[Silly me, I made so many changes that I lost the track of what was
the default value

]
I have P630 with 8GB, but I want to limit usage of RAM to 3 GB.
Application is running under AIX 433 without any problem with 3GB RAM.

Thanks,
VKG

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AIX 5.2 ML01: rss , rss_hard and stack , stack_hard in /etc/security/limits