Difference between revisions of "I/O sniffing"
From Linuxintro
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B : Barrier operation | B : Barrier operation | ||
S : Synchronous operations | S : Synchronous operations | ||
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| + | = See also = | ||
| + | * [http://linux.die.net/man/8/blktrace blktrace man page] | ||
| + | * [http://linux.die.net/man/1/blkparse blkparse man page] | ||
Revision as of 06:16, 25 May 2013
You can do I/O sniffing using the command blktrace. blktrace will show you every request that goes to the disk.
Example:
# blktrace -d /dev/sdg -o - | blkparse -i - [...] 8,96 7 106 0.373952974 11364 D W 0 + 8 [kworker/7:2] 8,96 7 107 0.374456639 47 C W 0 + 8 [0]
The RWBS(D) field can be a combination of
R : Read W : Write D : Block discard B : Barrier operation S : Synchronous operations
