[Octave-patch-tracker] [patch #7923] Reducing memory usage in perms: patch attached

[Arun Giridhar]

URL:
  <http://savannah.gnu.org/patch/?7923>

                 Summary: Reducing memory usage in perms: patch attached
                 Project: GNU Octave
            Submitted by: arungiridhar
            Submitted on: Mon 14 Jan 2013 04:59:40 PM EST
                Category: None
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

I noticed that calling perms(uint8(1:11)) on a system with 4GB memory thrashed
the virtual memory even though the input was only type 8-bit integer. I found
that perms was using the default type double in a couple of places internally.
I have attached a context diff showing two small changes I made to
octave/scripts/specfun/perms.m, which reduce memory usage substantially. In
particular, perms(uint8(1:11)) now returns without thrashing virtual memory.
Hope this helps.



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File Attachments:


-------------------------------------------------------
Date: Mon 14 Jan 2013 04:59:40 PM EST  Name: perm.diff  Size: 778B   By:
arungiridhar
Context diff for octave/scripts/specfun/perms.m to reduce internal memory
usage
<http://savannah.gnu.org/patch/download.php?file_id=27264>

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