Re: Help - Weka is crashing and "RunWeka.ini" didn't come as described in the WekaManual.pdf - Can't find a solution description for my specific case

Sorry about the outdated info in the manual. One way to increase the heap
size on Windows is to use the JAVA_OPTS environment variable that is read
by the WEKA start-up program (on Windows).

Go into "Edit environment variables for your account" in Windows. Then, add
a new variable

JAVA_OPTS

and set the value to

-Xmx6g

for example. Then, click OK, and start WEKA. The heap size will be 6GB now.

Cheers,
Eibe

On Sat, 4 Jun 2022 at 19:09, <[email protected]> wrote:

> Hello
>
> I'm having a problem with weka that is crashing (suddenly auto-closing
> itself) when I run the Ranker algorithm for a large .CSV file.
>
> It shows a small window saying OutOfMemory...
>
> I've tried to find a solution by going to other forums, videos,
> stakoverflow, and also to the PDF (WekaManual.pdf) included in the Weka
> installation directory (C:\Program Files\Weka-3-8-6).
>
> The possible solutions to increase the memory come from posts from 4-10+
> years ago and none of them have worked for me. Some forums talk about some
> commands, but they don't specify well where to run the commands, and I
> tried with the Windows PowerShell/CMD but it doesn't recognize the "Java"
> commands. I could see something about opening a kind of JVM command line
> (or something similar) but I couldn't find anything like that installed in
> Windows, and as in the PDF talks about just modifying a simple single line,
> then I thought this could be easily solved but... No for the moment.
>
> I also tried to follow the instructions in the WekaManual.pdf:
>
> “Weka 3.5.4 and higher Due to the new launching scheme, you no longer
> modify the batch file, but the RunWeka.ini file. In that particular file,
> you’ll have to change the maxheap placeholder. See section 21.2.2.”
>
> But when I open the RunWeka.ini file with a code/text editor, at least in
> my installation, there is no default line that says something about
> "maxheap..." And of course nothing in the batch file, but I tried manually
> adding the line ‘maxheap=12g’ right above the line ‘maxstack=20m’ that came
> by default in the RunWeka.ini file, thinking that maybe could be a missing
> line during the Weka installation process, and I saved the file, but it
> didn't worked and Weka is still having the same crashing problem every time
> I put it to work with the mentioned .CSV file, i.e. Weka is crashing after
> some seconds to start to run the Ranker algorithm. As extra notes, as in
> the RunWeka.ini file didn’t come a "maxheap..." line and the more similar
> to that I found was the line ‘maxstack=20m’, then I also tried to modify
> the line ‘maxstack=20m’ to ‘maxstack=2000m’ but Weka was not opening so
> returned it as its default status (‘maxstack=20m’), and also I tried with
> several ‘maxheap=…’ combinations like ‘maxheap=8g’, or ‘maxheap=8192m’, but
> nothing of that worked, recalling that this ‘maxheap=…’  didn’t come by
> default in the RunWeka.ini (it was manually added)
>
> So, I would like, please, you could help me to know what to do in this
> kind of cases where I can't find the possible solutions for these
> situations that I cannot find explained in the WekaManual.pdf. I would like
> to know about how to increase the memory for Weka, in order to work with
> the large .CSV file mentioned above. I can't find the location or path or
> console command (I only know about PowerShell/CMD) where I can modify the
> memory size for Weka. I don't know if you could have a video or document
> etc. that could show how to do this process for the cases like mine where
> the RunWeka.ini file seems to not to come in the "default" way described in
> WekaManual.pdf, i.e. no 'maxheap=XYZm' line.
>
>
> Additional information for more reference:
>
> - I'm using Weka in a system with: Windows 10 64bits, 16GB of RAM, Intel
> Core i7 (Quad-Core), and SSD.
>
> - I'm using the latest Weka version (v3.8.6), downloaded and installed for
> the first time a couple weeks ago.
>
> - In this PC, Weka has previously worked a couple times with another .CSV
> file days ago. A much smaller file but also a .CSV with similar
> information, and at that time ‘Ranker’ and ‘JRip’ run in multiple times
> without Weka crashes, without problems and giving the results almost
> instantly.
>
>
> Thank you in advance for your help and have a good rest of the day!
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