Unfortunately in this case there were no variables to erase. When I said
"memory leak" I was not meaning a memory leak losing memory to Windows, I
meant that for some reason the storage allocated via J's memory management
is not returned to J's memory management.
On 3/23/07, Devon McCormick <[EMAIL PROTECTED]> wrote:
Don -
I've run into this sort of situation before. Sometimes erasing extraneous
variables
helps but often it is just easier to restart the session. I'm not
familiar
with the
underlying causes but it seems to happen when creation of a large array
runs
out of memory, as you said.
Devon
On 3/23/07, Don Guinn <[EMAIL PROTECTED]> wrote:
>
> What follows is the entire contents of a J session which ran out of
> memory.
> This is on a 1G machine on Windows XP Pro.
>
> I was playing with one of the Project Euler problems and wanted to
verify
> the answer using rationals instead of floats. The solution using floats
> ran
> in about a second. When I converted it to use rationals it went to
paging
> and eventually ran out of memory. Fair enough. This is a pretty memory
> intensive approach.
>
> The problem is that once it ran out of memory nothing of any consequence
> worked. Even clicking File/Exit got out of memory. Fortunately 7!:3''
> worked, but it took a long time to run as it had to go through a lot of
> memory that was paged.
>
> The thing is that there should be plenty of memory available as nothing
> beyond the standard libraries were loaded. Is there a memory leak
> somewhere?
> Is it possible that when an out of memory occurs that J forgets to free
up
> memory? This is on j601/2006-11-17/17:05
>
> x:(x:^:_1]3r7)(_2:{[:(/:~)[:~.]%~[:<.*)>:i.100000
> 42857r100000
> x:(x:^:_1]3r7)(_2:{[:(/:~)[:~.]%~[:<.*)>:i.1000000
> 428570r999997
> x:(x:^:_1]3r7)(_2:{[:(/:~)[:~.]%~[:<.*)>: i.1000000
> 428570r999997
> 3r7(_2:{[:(/:~)[:~.]%~[:<.*)>:i.1000000
> |out of memory
> | (_2:{[:(/:~)[:~.]%~[:<.*)>:i.1000000
> x:(x:^:_1]3r7)(_2:{[:(/:~)[:~.]%~[:<.*)>:i.1000000
> |out of memory
> | x:(x:^:_1]3r7) (_2:{[:(/:~)[:~.]%~[:<.*)>:i.1000000
>
> |out of memory: wdhandler_0_
> | wdq=: wd'q'
>
> |out of memory: wdhandler_0_
> | wdq=: wd'q'
>
> |out of memory: wdhandler_0_
> | wdq=: wd'q'
>
> |out of memory: wdhandler_0_
> | wdq=: wd'q'
>
> |out of memory: wdhandler_0_
> | wdq=: wd'q'
> 7!:3''
> 64 29644938
> 128 1293
> 256 342
> 512 270
> 1024 84
>
> |out of memory: wdhandler_0_
> | wdq=: wd'q'
>
> -------At this point after I copied the session to the clipboard for
> pasting
> into this message I entered 2!:55'' and ended the session.
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
--
Devon McCormick, CFA
^me^ at acm.
org is my
preferred e-mail
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