I hear that PAE means that while your kernel is 32-bit it is configured to use extended physical addresses so that the OS can use all your physical memory. However,  PAE has a limitation: no single application can use more 
than 4Gb of memory. <br><br>This is likely causing your crash. (BTW that is a lot of memory for one recon-all process to ever reach...)<br><br>To solve this, you need to get a 64 bit installation, or find a way to stop MRIalloc from needing so much memory.<br>

<br>Best of luck<br><br>Joshua <br><br><br><div><font color="#999999">-<br></font></div><div><font color="#999999">Joshua Lee<br></font></div><font color="#999999"></font><div><font color="#999999">Center for Mind and Brain &amp;<br>

</font></div><div><font color="#999999">Department of Psychology<br></font></div><font color="#999999">University of California, Davis<br></font><br>
<br><br><div class="gmail_quote">On Fri, Dec 2, 2011 at 7:21 AM, Fidel <span dir="ltr">&lt;<a href="mailto:falfaro@hggm.es">falfaro@hggm.es</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">

Dear all,<br>
<br>
I&#39;m having a problem running trac-all -prep.<br>
I receive this error (FROM THE TRAC-ALL.LOG WHICH IS ATTACHED):<br>
<br>
MRIalloc(218, 182, 182): could not allocate 158704 bytes for 25th slice<br>
<br>
Cannot allocate memory<br>
<br>
Linux ubuntu 2.6.38-13-generic-pae #52-Ubuntu SMP Tue Nov 8 17:50:45 UTC<br>
2011 i686 i686 i386 GNU/Linux<br>
<br>
trac-preproc exited with ERRORS at Fri Dec  2 05:02:57 PST 2011<br>
<br>
I am using Ubuntu 11.04 (Natty) 32bits and the kernel is  2.6.38-13-generic-pae, that is, it can use more than 4 GB of RAM (In fact, I was running it with 16GB of RAM) so we think memory was not the real  cause of the problem.<br>


<br>
The freesurfer version was: freesurfer-Linux-centos4-<u></u>stable-pub-v5.1.0<br>
<br>
Thanks and best regards.<br><font color="#888888">
<br>
Fidel.<br>
<br>
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