"fsync = off" in recovery

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Dear Colleagues,

When a cluster is in recovery mode (a delayed replica, PITR etc), does
the setting of "fsync = off" speed up the application of WALs?

I've done some experimenting and got dubious results, so what does the 
theory say?

-- 
Victor Sudakov VAS4-RIPE
http://vas.tomsk.ru/
2:5005/49@fidonet

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