Many thanks for your answer Mark. I'm using the last version of FSL (5.0) on Ubuntu 13.04 64-bit. I also have a couple of Gb of RAM always busy and as soon as the swap starts being used (i have more than 10 Gb ot swap) the system slows down so much it becomes unusable.
Is there a way to set a limit to the amount of RAM use by fslmerge, or only use one volume at a time in the RAM during the merge procedure?
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