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Re: Clear everything in IDL? [message #10010 is a reply to message #9949]

Fri, 26 September 1997 00:00

Peter Mason
Messages: 145
Registered: June 1996

Senior Member

On Wed, 24 Sep 1997, Matthew J. Sheats wrote:
> There is a bigger issue here unfortunately. At this time I'm not so
> sure if it is an OS related problem. I can write programs dynamically
> allocating memory from the heap and releasing it back without a hitch in
> C++. So I think there is more going on. Perhaps ( as the FAQ says ) it
> is because they use malloc's etc.

Fraying the thread...
It looks like IDL 5 is using a 3rd-party memory-allocation library called
"SmartHeap" (on Win95 at least). This purports to be far quicker and more
efficient than the standard malloc library you get with a compiler.
Well, apparently not always. I'd guess that it must be a help for the
countless reasonably-small allocations a typical IDL program does, but it
appears to get in the way when really chunky allocations (in the megs) are
involved.
With IDL5/Win95 I still see "freed" memory (*large* variables) getting returned
to the system. However, really large allocations seem to take a lot longer
than in IDL4 (which doesn't use SmartHeap, I presume), and the ceiling for
allocations appears to be significantly lower. (Well, no, it *is* lower - I
can definitely get away with more in IDL4.)

Peter Mason
(Mr. Subjunctive)

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[Message index]

		Re: Clear everything in IDL? By: Peter Mason on Wed, 24 September 1997 00:00
		Re: Clear everything in IDL? By: Alex Schuster on Tue, 23 September 1997 00:00
		Re: Clear everything in IDL? By: gurman on Tue, 23 September 1997 00:00
		Re: Clear everything in IDL? By: Matthew J. Sheats on Mon, 22 September 1997 00:00
		Re: Clear everything in IDL? By: Peter Mason on Fri, 26 September 1997 00:00
		Re: Clear everything in IDL? By: Matthew J. Sheats on Wed, 24 September 1997 00:00

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