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Re: memory allocation on Macs [message #61047 is a reply to message #60187]

Thu, 26 June 2008 12:14

Keflavich
Messages: 19
Registered: May 2008

Junior Member

I have some follow-up questions on this discussion....

I'm running into the errors described above, I believe:
idl(42359,0xa0281fa0) malloc: *** mmap(size=112533504) failed (error
code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
% Unable to allocate memory: to make array.
Cannot allocate memory

so this appears to be a limit imposed by the OS. What I'm not
entirely clear on is, first, does that 4GB limit include virtual
memory?

Then... second... any tips on getting around gigantic memory issues?
I'm running into them using the Goddard astron library for coordinate
transformations. The big problem is (at least partly) that my very
large float arrays get converted into doubles because all of the
astron packages use doubles. There's no way to force the arrays to
stay in the smaller version, right?

Would it be possible to do something like write the necessary files to
hard disk, spawn a new IDL, have it process the data (assuming that it
doesn't independently exceed 4gb...) and write that back? Seems
complicated to me, so I don't really want to attempt it until I've
ruled out other possiblities.

Thanks,
Adam

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[Message index]

		memory allocation on Macs By: pgrigis on Thu, 01 May 2008 09:18
		Re: memory allocation on Macs By: pgrigis on Mon, 05 May 2008 13:49
		Re: memory allocation on Macs By: Keflavich on Thu, 26 June 2008 12:14
		Re: memory allocation on Macs By: dcleon@gmail.com on Mon, 05 May 2008 06:49
		Re: memory allocation on Macs By: henrygroe on Sat, 03 May 2008 07:20
		Re: memory allocation on Macs By: wlandsman on Fri, 27 June 2008 06:40
		Re: memory allocation on Macs By: Keflavich on Thu, 26 June 2008 16:43
		Re: memory allocation on Macs By: wlandsman on Thu, 26 June 2008 13:54

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