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Re: allocating memory [message #56354 is a reply to message #20680]

Thu, 18 October 2007 08:37

R.G.Stockwell
Messages: 163
Registered: October 2004

Senior Member

<jtmcahill@gmail.com> wrote in message
news:1192673434.544923.139390@i38g2000prf.googlegroups.com.. .
> So, I have this large model file that I need to open. Although it is
> 650MB I should be able to open it in IDL on my pc computer which has
> ~4GB of Memory. However, it keeps telling me insufficient memory.
> However, if I try to open it in IDL on a linux machine with ~2GB
> memory I can open it no problem. Is there a way to make my windows
> based pc cooperate and allow me to open this file that should be no
> problem to open?
>
> Thanks,
> Hawaiianite

I've attached a short program memtest.pro below. I grabbed this
off the newsgroup.

It shows you the memory sizes you can allocate.

The problem may be fragmentation of your ram by the many
dlls loaded by windows and other programs. I'd remove everything
you can from the startup (and other automatically loading programs)
and reboot (remove spyware, antivirus, firewalls, mail programs, but
be careful not to forget to turn them back on). That may help.

pro memtest
compile_opt idl2 ; set default integers to 32-bit and enforce [] for
indexing

MB = long64(2)^20
currentBlockSize = MB * 2047 ; 2 GB

print,'current block size = ',currentblocksize
maxIterations = 10 ; Max loop iterations
memPtrs = ptrarr(maxIterations)
memBlockSizes = ulonarr(maxIterations)

for i=0, maxIterations-1 do begin
; Error handler
catch, err

; Sepcifically designed for "Failure to allocate memory..." error
if (err ne 0) then begin
currentBlockSize = currentBlockSize - MB ; ...try 1 MB smaller
allocation
if (currentBlockSize lt MB) then break ; Give up, if currentBlockSize
< 1 MB
endif

; This 'wait' enables Ctrl-Break to interrupt if necessary (Windows).
wait, 0.0001

; Allocate memory (if possible)
memPtrs[i] = ptr_new(bytarr(currentBlockSize, /nozero), /no_copy)
memBlockSizes[i] = currentBlockSize ; Store the latest successful
allocation size

; Print the current allocated block size and the running total, in Mb
print, format='(%"Memory block #%2d: %6d Mb (total: %4d Mb)")', $
i + 1, ishft(currentBlockSize, -20),
ishft(ulong(total(memBlockSizes)), -20)
endfor

ptr_free,memPtrs
end

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[Message index]

		Allocating memory in LINKIMAGE program By: Virginia Rogers on Wed, 19 July 2000 00:00
		Re: Allocating memory in LINKIMAGE program By: Randall Frank on Thu, 20 July 2000 00:00
		Re: allocating memory By: Karl Schultz on Thu, 18 October 2007 11:52
		Re: allocating memory By: rtowler on Thu, 18 October 2007 09:24
		Re: allocating memory By: Jean H. on Thu, 18 October 2007 08:41
		Re: allocating memory By: R.G.Stockwell on Thu, 18 October 2007 08:37
		Re: allocating memory By: Andrew Cool on Sat, 20 October 2007 01:14
		Re: allocating memory By: MP on Thu, 18 October 2007 08:25
		Re: allocating memory By: krastoboy on Thu, 18 October 2007 01:10

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