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I was running some wav files through the spectrogram increasing the fft window size.  Generally just playing around.

I have run into an issue.  After running a few times the mem usage for maple.exe starts to run high.  I get it up to 600,000 K and still seems to run okay - ie able to produce a spectrogram.  However running it again at a higher window size of course eats up more memory and right around 1,000,000 K mem usage everything slows down and it appears to freeze.  The spectrogram is not displayed, after a short while CPU usage drops to zero the heartbeat circle (evaluating symbol - bottom left corner) stays solid and everything appears to stop. 

It is possible to close the worksheet in the same maple session after some time and open a new one.

Another note.  After one worksheet has ramped up the mem usage to a large value say 800,000 K (it doesn't really matter) .. when I close the worksheet (in the same maple session) the mem usage remains high even after a restart;gc():   I not sure if this has been normal throughout the ages, but I thought after closing a high mem usage worksheet in the same maple session the mem usage in the windows task manager would have updated back down under 100,000 K at least. 

The system Maple is running on right now is a P4 3Ghz Windows XP at 2.50 GB RAM Maple 18.00 stnd GUI 32 bit.  Using the spectrograms example in the application center for start.

Any insight as to why the computer starts to freeze up around 1,000,000 K mem usage would be helpful.  Also why closing a worksheet had no effect on the mem usage.  Would be interesting to know if this occurs on other machines as well.

Hi,

Is there any difference between

Matrix(4,5,(K,C)->K+C);

and

Array(1..4,1..5,(K,C)->K+C);

 

Say if I have a very 'complicated' procedure myfunc(K,C) that takes two options, but it runs all dependently.

Matrix(4,5,(K,C)->myfunc(K,C));

and

Array(1..4,1..5,(K,C)->myfunc(K,C));

Which one is more efficient? The final ouput of each run from myfunc is just a integer value.

 

The reason I am asking it that i think both runs on a 'single' thread (core) as CPU usage is always very low, around 15-20%.

If I look at the task manager, some cores (threads) arent doing anything.

Is there anyway to speed things up?

 

Thanks,

Hi,

 

is there any analogous command to whos in Matlab to list the memory usage of specific variables in workspace?

Thanks!

Bye

Tom

I'm using maple 14 on a win7 2.8gHz 4gb laptop and over the past 2 days my maple has fallen appart, i'm trying to print a worksheet that is only 5 pages and not especialy complicated but maple's memeroy usage is exploding up to 400mb, or 1.3gb if i actually run the code. I need to print the work sheet and it just spent half an hour "spooling" i don't know what is causing maple to go haywire

I would like to pay  attention  to the PhD thesis by John Baber in an actual field of complex analysis done with Maple: http://arxiv.org/PS_cache/arxiv/pdf/1106/1106.4737v1.pdf . It should be noticed that the usage of Maple is an essential tool of this work (for example, see p. 28, 43, and around), not a fashion trend.

Hi Everyone,

I'm wondering if anyone here has had a similar experience.

I assign Maple projects to my students in table format.  They do their work in the first column and I write my comments in the second column.

I noticed that while I grade a worksheet (Maple 14 on a Windows 7 laptop), Maple becomes very sluggish.  I started monitoring  Maple's memory usage while editing.  When I open the file, the memory footprint is roughly 60,000K....

I stumbled upon this interesting quirk.  My apologies if it's already been brought up.  This is for Maple 12 on a 32 bit windows machine.  It's possibly different for newer versions and operating systems. 

restart;
gc();
memory usage displays 1.37M

restart; gc();
memory usage displays 0.43M

The point was that it uses more than a half a megabyte more if gc() is put on a seperate line ... interesting..

I suppose this topic has come across many peoples minds at one time or another and I've only taken this number for granted and with a grain of salt.  I have become curious as to what other Maple users would run the memory usage up to? 

For myself I find on average usually running below 10Mb or so.  I suppose this is average, for me, but I haven't usually created large worksheets, I don't think I've ever let it run over 40Mb. ...

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