linux - What can I do to find the cause of pread64/pwrite64 hangs? -


my application doing heavy io on raw /dev/sdb block device using pread64/pwrite64. doing fine. call pread64/pwrite64 takes little 50-100us. takes whole lot more, several seconds.

what can recommend find cause of such problem?

i have not used have heard tool called latencytop.


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