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.
----------------------------------------------------------------------
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--
Devon McCormick, CFA
^me^ at acm.
org is my
preferred e-mail
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