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Re: Q: Efficient Memory handling and deallocation [message #4197 is a reply to message #4107]

Fri, 05 May 1995 00:00

rutledge
Messages: 4
Registered: May 1995

Junior Member

In article <D82wnn.K29@hpl.hp.com>, peter@hpl.hp.com (Peter Webb) writes:
>
> Would a C program, using malloc(), perform any differently? That is, if
> I had a program that malloc'ed a big block, then free'd it, then
> malloc'ed a little block, then started over, would I see the same
> behavior as I see from IDL?
>
> If there is no difference, then it really is an OS problem/feature, and
> RSI would have to add their own memory management. If not, then maybe
> RSI could do something about it.

Most definitely in SunOS, free() results in de-allocating memory from the
program heap, making it available to other users. I have been unable to
get my applications to do this, and it causes major slowing down of programs
for me (for instance, I need at one point, LOTS of data, which gets sorted
out, and binned, after which I de-allocate it, but then -- I get stuck paging
through this later because the 100M I allocated is still in the heap, even
though I de-allocated it).

Paul Probert (probert@uwmfe.neep.wisc.edu) wrote:
: But we figured out, as you did, that IDL
: doesn't deallocate the memory. One workaround is, at the beginning of
: your program, create and then immediately delete an array 2 or 3 times
: the size of your needs, and this will leave a hole big enough for many
: future reallocations.

True enough, but my problem is that I want the heap to be freed, so that I
don't have to page through at 150M heap (when my computer only has 96M).
Any suggestions?

Bob

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[Message index]

		Q: Efficient Memory handling and deallocation By: rutledge on Thu, 04 May 1995 00:00
		Re: Q: Efficient Memory handling and deallocation By: Paul Probert on Thu, 04 May 1995 00:00
		Re: Q: Efficient Memory handling and deallocation By: rutledge on Fri, 05 May 1995 00:00
		Re: Q: Efficient Memory handling and deallocation By: peter on Fri, 05 May 1995 00:00

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