Statistics

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CRIU generates a set of stats-<type> files that contain statistics about how dump/restore went. These files are in google-protocol-buffers format, just like the images are, and can be viewed using the criu show -f [FILE] command.

Dump/Pre-dump stats[edit]

These are in stats-dump file. Fields are:

freezing_time
Time it took criu to freeze the process tree
frozen_time
Time tasks were in frozen state
memdump_time
Time criu spent grabbing required pages out of processes. This time does not include the next time
memwrite_time
Time criu spend transferring memory pages into image files (locally or on page-server)

All the above times are in microseconds.

pages_scanned
The number of pages criu looked at to decide whether or not to dump them
pages_skipped_parent
The number of pages criu skipped due to they were found in parent images (read about memory changes tracking)
pages_written
The total number of pages criu put into image files

Restore stats[edit]

forking_time
Time took to fork the tree of processes (with groups and sessions)
restore_time
Total time of restore
pages_compared
Number of pages compared for being COW-ed
pages_skipped_cow
Number of pages, restoration of which was skipped due to COW setup