AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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Bob Cox
June 20, 2017 04:57PM
An uncompressed dataset in .HEAD/.BRIK format is mapped into memory from disk, which can work with very large files. Otherwise, you must have more memory (RAM) available than the size of the file. Memory mapped large files might work, but they will tend to be very slow if there isn't enough RAM to page them into memory.

So really, the answer to your question depends on the amount of memory you have available. On the NIMH Linux cluster, the nodes have 120 GB each. But my desktop has only 16 GB.

There is a limit that the amount of data in a single volume can't be more than 2 giga-voxels. That is, a single volume can't be very large itself. There is no intrinsic AFNI upper limit on the size of a multi-volume dataset, except for this limit on the size of a single volume. This limit arises from the use of 32-bit ints to store 3D indexes.
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Maximum file size

heiding66 June 20, 2017 03:54PM

Re: Maximum file size

Bob Cox June 20, 2017 04:57PM