| Memory allocation problem [message #63973] |
Wed, 26 November 2008 07:56  |
kodark
Messages: 1
Registered: November 2008
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Junior Member |
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Hi all,
I am a beginner-level user of IDL. Recently I run into the memory
allocation problem: 'unable to allocate memory'. I loaded a large
image (11820*11820, float, about 530M) into an array. Then when I
tried to create two new arrays of the same size, the program said
'unable to allocate memory'.
I have read a lot of articles about this problem on the net, but I
still cannot solve this problem. My computer runs 32-bit Windows XP
with 4GB RAM and I have assigned 10GB from hard drive to Virtual
Memory. The virtual memory looks contiguous in the Disk Defragmenter
program. I am curious about the following output.
IDL> help,/memory
heap memory used: 681301, max: 681324, gets: 765,
frees: 413
Then I executed the MemTest program provided by ittvis
% Compiled module: MEMTEST.
Memory block # 1: 806 Mb (total: 806 Mb)
Memory block # 2: 390 Mb (total: 1196 Mb)
Memory block # 3: 214 Mb (total: 1410 Mb)
Memory block # 4: 143 Mb (total: 1553 Mb)
Memory block # 5: 66 Mb (total: 1619 Mb)
Memory block # 6: 59 Mb (total: 1678 Mb)
Memory block # 7: 56 Mb (total: 1734 Mb)
Memory block # 8: 40 Mb (total: 1774 Mb)
Memory block # 9: 27 Mb (total: 1801 Mb)
Memory block #10: 23 Mb (total: 1824 Mb)
It is obvious that the second largest block is less than 530M.
Then
IDL> help,/memory
heap memory used: 685533, max: 1913289245, gets: 789,
frees: 433
The heap memory max increased from 681324 to 1913289245.
I want to know why the virtual memory is not recognized and used? why
the heap memory max changed?
Thank you.
Kodark
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