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high diskI/O load by sync? [message #45165]

Fri, 03 February 2012 04:22

iowissen
Messages: 11
Registered: February 2012

Junior Member

we found diskI/O getting very high and a careful check shows "sync" in a container may cause very high disk I/O behavior. even cgroup blkio.throttle cannot supress the I/O.

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Re: high diskI/O load by sync? [message #45171 is a reply to message #45165]

Mon, 06 February 2012 03:20

iowissen
Messages: 11
Registered: February 2012

Junior Member

we also find that, if we do some disk I/O critical task in a container, and meanwhile do "sync" on another, the sync in the latter will be heavily delayed. e.g., in CT1 we do

stress -d 4

while in CT2 we do

time sync

then the sync would run more than 40 second. (for comparison, when we do nothing in CT1, CT2's sync costs only 1 second about).

could anyone confirm if the "sync" call in container would cause the whole host into sync or not?

thanks a lot!

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