topic Re: Why the memory can not be released. in Operating System - OpenVMS

Why the memory can not be released.

olive_wide — Thu, 09 Jun 2005 04:43:52 GMT

Openvms7.3-2
Before I run the application,I use the following:
$moni cluster or$show memory
It shows the memory is used 14%.
After I run the application,use the same:
$moni cluste or$show memory
It shows the memory is used 60%.
Then,I stop the application,and show memory by $moni cluster or $show memory
It still shows the memory is used 60%.
It seems that the memory has not been released.WHY?

Re: Why the memory can not be released.

John Gillings — Thu, 09 Jun 2005 05:19:54 GMT

olive,

You will need to post the before, during and after displays that you're wondering about. This is probably just an interpretation issue.

Re: Why the memory can not be released.

John Gillings — Thu, 09 Jun 2005 05:24:30 GMT

Doh! Sorry, just realised a more likely explanation. If you're talking about the free list not recovering...

The application has, no doubt, read a number of files, which have been moved into the XFC Cache. The cache will retain allocations until the free list gets depleted. So the "missing" 46% of memory are your files sitting in cache, just in case you want to read them all again.

As other processes demand memory, the cache will give it up.

Check SHOW MEM/CACHE as well as SHOW MEM to confirm that it has grown by the same amount that is "missing".

In other words, situation normal, nothing to worry about.

Re: Why the memory can not be released.

olive_wide — Thu, 09 Jun 2005 08:05:10 GMT

John,
Thank you.

Re: Why the memory can not be released.

olive_wide — Thu, 09 Jun 2005 08:11:19 GMT

I have found a solution to this question as seen in the comments below.