Dear List,
I have run recon-all -all on the same scan on two different machines likely running two different versions of Linux but in any case the runs were done with different numbers of cores. I haven't done anything fancy to compare that the results are identical except for some spot checks of individual files with md5sum. label/lh.BA4a.label shows up the same on both. mri/wmparc.mgz does not. Your comments would be welcome. Is there something about the non-ascii files, e.g. wmparc.mgz, which would make them show different checksums, e.g. inclusion of a processing time or some such? Do you have experience or suggestions for convincing ourselves that we are getting the same answers on different machines? ???
Thanks - Don
Don,
Running FreeSurfer on two different versions of any operating system will not produce the same results. If you want the same results, you must use exactly the same version of an operating system for all of an analysis.
hth d
On 2/5/16 8:29 PM, Krieger, Donald N. wrote:
Dear List,
I have run recon-all –all on the same scan on two different machines likely running two different versions of Linux but in any case the runs were done with different numbers of cores.
I haven’t done anything fancy to compare that the results are identical except for some spot checks of individual files with md5sum.
label/lh.BA4a.label shows up the same on both.
mri/wmparc.mgz does not.
Your comments would be welcome.
Is there something about the non-ascii files, e.g. wmparc.mgz, which would make them show different checksums, e.g. inclusion of a processing time or some such?
Do you have experience or suggestions for convincing ourselves that we are getting the same answers on different machines?
???
Thanks - Don
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Even on the same operating system they will be different because there is stuff in the header that will change. Use mri_diff (volumes, segmentations, and surface overlays) or mris_diff for surfaces to check whether they are different.
On 2/5/16 11:55 PM, dgw wrote:
Don,
Running FreeSurfer on two different versions of any operating system will not produce the same results. If you want the same results, you must use exactly the same version of an operating system for all of an analysis.
hth d
On 2/5/16 8:29 PM, Krieger, Donald N. wrote:
Dear List,
I have run recon-all –all on the same scan on two different machines likely running two different versions of Linux but in any case the runs were done with different numbers of cores.
I haven’t done anything fancy to compare that the results are identical except for some spot checks of individual files with md5sum.
label/lh.BA4a.label shows up the same on both.
mri/wmparc.mgz does not.
Your comments would be welcome.
Is there something about the non-ascii files, e.g. wmparc.mgz, which would make them show different checksums, e.g. inclusion of a processing time or some such?
Do you have experience or suggestions for convincing ourselves that we are getting the same answers on different machines?
???
Thanks - Don
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
freesurfer@nmr.mgh.harvard.edu
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dgw -
Douglas Greve -
Krieger, Donald N.