Hi Kiran,

So, what can I be sure of, is that mmap call is failing on only one OS,
this means that there's an insufficient amount of some resource to map
the requested file into application's memory. Some of the possible
reasons, can be the fact that the swap might be filled up, or there are
other processes which are having too many virtual memory resources
reserved.

I don't know too many about IBM AIX OS, but I think that you should see
who is using virtual memory (print out the memory statistics), and to
watch over the processes that are running in the same time... to see if
you find something large.

You might want to allow the kernel to grant more shared memory, I don't
know how to do it on AIX. What is your cache size and how many memory
are you having available on your system? Are the same settings with the
systems which are working with the same stress test?

Regards,
Bogdan Coman, Oracle