[Eeglablist] Out of memory

Alexandre Lehmann alexandre.lehmann at gmail.com
Mon Dec 6 17:52:30 PST 2010


Dear list

For your information a switch to Linux appears to be easing memory problems.
When importing bdf and cnt files of around 150 Mo, the previous system (32
bits Windows 7 with 4Go RAM) would return an out of memory error whereas the
current test system (32 bits Ubuntu 9 with 1.5 Go RAM) can import them
without problem.

Regards

Alexandre

On Sun, Nov 28, 2010 at 1:26 AM, Arnaud Delorme <arno at ucsd.edu> wrote:

> Dear Alexandre,
>
> increasing virtual or swap memory will most likely not help because Matlab
> only seems to be able to allocate real physical non-paged memory.
>
> The most affected operating system seems to be Windows 32-bit with recent
> versions of Matlab where even with more than 2Gb physical memory, it is
> sometimes impossible to open 100Mb files.
>
> The solutions are
> - buy even more RAM
> - Close all programs, remove Windows services (Adobe etc...), reboot
> - Change of OS (Windows 7 might seems to have less problems than Win XP)
> - Try different memory manager "start Matlab from the DOS command line
> with matlab -memmgr fast option
> - Use older versions of Matlab that behave better with 32-bit systems (how
> old?)
> - Look at http://www.mathworks.com/support/tech-notes/1100/1107.html
>
> Under OSx or linux, Matlab cannot allocated inactive memory. You may free
> it by tiping "du -sx /" (in OSx you will see the blue inactive memory
> decreasing).
>
> Arno
>
> ps: under Matlab 2010b Linux Fedora Core 64-bit, we have successfully
> allocated matrices of up to 74Gb.
>
> On Nov 13, 2010, at 9:23 PM, Alexandre Lehmann wrote:
>
> Hello All,
>
> Klados, when you say "Try to swap your physical memory from the hard
> drive.", you mean adding some pagfile in memory preferences in windows ? Or
> are you refering to another procedure or another OS ?
>
> I did try to increase my virtual memory by creating a pagefile of 4Gb, but
> even 150Mb bdf files would still give an out of memory error.
>
> Thanks,
>
> Regards
>
> Alexandre
>
>
>
> On Thu, Nov 11, 2010 at 2:21 AM, Klados Manousos <mklados at med.auth.gr>wrote:
>
>> Hello to all,
>>
>> Both systems you menioned are running the same programes? Because one
>> system may run in background applications that need more memory than the
>> other....
>>
>> Try to swap your physical memory from the hard drive... With that way i
>> achieved to load big files in EEGLAB
>>
>> 2010/11/9 Benjamin Kuhr <bkuhr at uni-osnabrueck.de>
>>
>> Hi,
>>>
>>> I tried to import a large *.bdf file, 614 MB. I get the "Out of memory" -
>>> message, but not on all computers and for some reason it seems as it does
>>> not depend on the actual memory. It works on a weaker system, but not on
>>> the current one, which has 3.8 GiB of memory and a Intel Core 2 Duo CPU
>>> R7500 @ 2.93 GHz.
>>>
>>> Even on identical systems with the same hardware and same software I can
>>> load the file only on one of them. I tired it with Windows XP and Ubuntu
>>> 10 on the system mentioned above, no difference. Any suggestions?
>>>
>>> Thanks in advance
>>> Benjamin Kuhr
>>>
>>>
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>>
>>
>>
>> --
>> Manousos A. Klados
>> PhD Candidate -- Research Assistant
>> Group of Applied Neurosciences
>> Lab of Medical Informatics
>> School of Medicine
>> Aristotle University of Thessaloniki
>> P.O. Box 323 54124 Thessaloniki Greece
>> _________________________________________________
>> Tel: +30-2310-999332
>> Fax:+30-2310-999263
>> Website: http://lomiweb.med.auth.gr/gan/mklados
>>
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