When occasionally opening the graphics display there infrequently appears a dialog message \"model checkpoint.\" The checkpoints do not appear to be even remotely coordinated with trickles, nor in a regualr recurring pattern. Found no reference to them in FAQs. Anyone have a clue?

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One of my Favorite Quotes:
"We are all atheists about most of the hundreds of thousands of gods humans have ever believed in. Some of us just go one god further."
Richard Dawkins

This is the model saving same data so that it has a know good point from which to restart. When they occur varies according to the different model types.

There\'s a bit on them here in the BOINC Wiki.