Pawel (privately) wrote:
Hi,
 
Thank you for all responses. I am reading AIX materials and started from IBM link that Jim sent (malloc subsystem explanations).
 
Is it all about:

Malloc Disclaim

Malloc Disclaim is an optional extension of the malloc subsystem, providing the user with a means to enable the automatic disclaiming of memory returned by the free subroutine. This is useful in instances where a process has a high paging-space usage, but is not actually using the memory.
Malloc Disclaim is not enabled by default. It can be enabled and configured prior to process startup through the MALLOCOPTIONS environment variable, as follows:
MALLOCOPTIONS=disclaim
We are going to test "Watson" more carefully and play with MALLOCOPTIONS. Be sure that you will hear me again :)

This won't help you I think because that isn't what is happening. The output of WHERE (V isn't telling you that there is a lot of memory that has been freed but not disclaimed, it is telling you that it is in use. I think that there has been some confusion over what Pat said about the mw42 command output vs your WHERE (V output. That (WHERE output) is NOT a high watermark, it is telling you what is actually used!

In fact this option may make performance worse for you in some cases, because unless your system has begun page swapping, there is no need to return the address space to the system.

Be careful with your experimentation. First just turn on watson, then start playing with MALLOCOPTIONS - these things are not really there to just play with to be honest, you really need to understand how the whole thing works to get any benefit other than randomly ;-)

You just need to turn on watson now and see if there is any difference. It think that there will be and that things won't be any worse. If there is a memory leak, then nothing will change really (though it might allow the process to get through the work). Otherwise you either need help to show definitively that this is a memory leak, or you need to get some serious input from TEMENOS technicians (not help desk answers I am afraid).

Jim

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