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Performance research (edit)

262 bytes added , 20:54, 30 January 2014

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Written here are performance issues found

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Written here are performance issues found.

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Timing stats of live migration of a small container with 11 tasks is

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* Total time ~3.5 seconds

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* Frozen time ~3.0 seconds

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** Pre-dump stages ~0.5 seconds each

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** Restore time ~1.9 seconds

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** Images transfer time ~0.3 seconds

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Below is the list of issues found

== Dump ==

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== <code>parse_smaps</code> ==

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This ~~guy~~ exploits /proc heavily. For a container with 11 tasks the syscall stats look like

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Time spent in this routine is about 0.1 seconds on dump. This one exploits /proc heavily. For a container with 11 tasks the syscall stats look like

834 read

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11 openat(AT_FDCWD, "/proc/$pid/map_files", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 4

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~~Time spent in this routine is about 0.1 seconds on dump.~~

== Restore ==

2,257

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