[ROOT] mnsave and TMinuit

From: Dr. John Krane (jkrane@netzero.com)
Date: Fri Jan 30 2004 - 17:59:13 MET

Hi everyone,

I'm running jobs with TMinuit that take 1-4 weeks to complete.  I am finding that system instabilities can cause my machine's uptime to be less than the time required to finish the fit.  It is *very frustrating* to wait a long time and end up with nothing.

I see that TMinuitOld purportedly has a method called mnsave that writes the intermediate fit results to file "in format which can be reread by Minuit for restarting".  That sounds like exactly what I want to happen every few hours, but I cannot find the file TMinuitOld to write a version that does so.

Has anybody on this list put together a version of TMinuit that writes a journal-file and can restart a fit from said file?  If not, does anybody have any advice for me as I try to write my own?  I don't at this time know what variables TMinuit would need to save and recover, or if any other classes would also have to recover parameter values.

    - John

Dr. John Krane

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