Free does actuall releases the physical pages?

All
I was stuck with a basic UNIX malloc/free problem. Any help from anybody?
I have a program which takes all the available (Primary + SWAP) and releases (malloc/free) immediately. Please note that malloc does not actually allocates the physical pages of memory and it simply increases the DS. So after malloc, I zeroed out the entire space to allocate the acutal physical pages to my process. Later I freed the complete memory.
Neither the process size & Heap nor the resident set size decreased. Before terminating the process, I started another instance of the same process, which failed during the malloc.
The observation is on Solaris 5.7. I do know this is not related to any FS buffering or similar. Does the Anon segment memory never freed with free command? I know I am missing some basic things, can somebody help?
Thanks
Ramesh

The physical pages are not freed immediately because application may ask for more memory again.
This is to make malloc and free fast. And also it depends on which malloc library you are using.
For example :- libmtmalloc creates 2^^n caches (where n is :- 0 <= n < 16). And once free is called on a buffer, it may not be freed immediately. Programs heap is a contiguous virtual memory space and it is the responsibilty of malloc library to manage the heap not kernel. So you ran out of swap space.
--Saurabh Mishra

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