Is there a way that I can define a two-dimensional array in
array.array()? Thanks.
On Aug 14, 2006, at 2:28 PM, John Machin wrote:
> Yi Xing wrote:
>> I tried the following code:
>>
>>>>> i=0
>>>>> n=2600*2600*30
>>>>> a=array.array("f")
>>>>> while (i<=n):
>> .. i=i+1
>> .. a.append(float(i))
>
> Not a good idea. The array has to be resized, which may mean that a
> realloc won't work because of fragmentation, you're out of luck because
> plan B is to malloc another chunk, but that's likely to fail as well.
>> ..
>> Traceback (most recent call last):
>> File "<stdin>", line 3, in ?
>> MemoryError
>>
>> to see the size of the array at the time of memory error:
>>>>> len(a)
>> 8539248.
>
> Incredible. That's only 34 MB. What is the size of your paging file?
> What memory guzzlers were you running at the same time? What was the
> Task Manager "Performance" pane showing while your test was running?
> What version of Python?
>
> FWIW I got up to len(a) == 122998164 (that's 14 times what you got) on
> a machine with only 1GB of memory and a 1523MB paging file, with
> Firefox & ZoneAlarm running (the pagefile was showing approx 300MB in
> use at the start of the test).
>
>> I use Windows XP x64 with 4GB RAM.
>
> Maybe there's a memory allocation problem with the 64-bit version.
> Maybe MS just dropped in the old Win95 memory allocator that the timbot
> used to fulminate about :-(
>
> Cheers,
> John
>
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