| Re: allocating memory [message #56419 is a reply to message #56365] |
Sat, 20 October 2007 14:25   |
R.G.Stockwell
Messages: 163
Registered: October 2004
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Senior Member |
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"Andrew Cool" <andrew.cool@dsto.defence.gov.au> wrote in message
news:1192868061.603580.289300@e9g2000prf.googlegroups.com...
> On Oct 19, 12:37 am, "R.G. Stockwell" <noem...@please.com> wrote:
>> <jtmcah...@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
>
> Hmm, Here's what I get on my 4GB of RAM Quad core system running 64
> bit IDL (v6.4) under 64 bit Vista :-
>
> IDL> memtest
> current block size = 2146435072
> Memory block # 1: 2047 Mb (total: 2047 Mb)
> Memory block # 2: 2047 Mb (total: 4094 Mb)
> Memory block # 3: 2047 Mb (total: 2045 Mb)
> Memory block # 4: 2045 Mb (total: 4090 Mb)
> Memory block # 5: 2043 Mb (total: 2037 Mb)
> Memory block # 6: 2041 Mb (total: 4078 Mb)
> Memory block # 7: 1803 Mb (total: 1785 Mb)
>
> Can't say I know how to interpret that at all !!
YOWZA! I'd interpret that as: you have scads of memory available
(yes scads).
and you should be able to allocate 650mb (since you allocate 2gb twice)
very easily.
Is the problem somewhere else? (check the actual size you are trying
to allocate for instance)
The best I can do (on my system) is slightly less than 1gb on a 4gb system,
so I ended up running my image processing on a 64 bit machine
with 16gb of ram.
Cheers,
bob
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