Difference between revisions of "I/O sniffing"
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# blktrace -d /dev/sdg -o - | blkparse -i - | # blktrace -d /dev/sdg -o - | blkparse -i - | ||
[...] | [...] | ||
| − | <abbr title="device (major/minor number)">8,96</abbr> <abbr title="processor">7</abbr> <abbr title="sequence number">106</abbr> <abbr title="timestamp">0.373952974</abbr> <abbr title="PID">11364</abbr> <abbr title="Event">D</abbr> <abbr title=" | + | <abbr title="device (major/minor number)">8,96</abbr> <abbr title="processor">7</abbr> <abbr title="sequence number">106</abbr> <abbr title="timestamp">0.373952974</abbr> <abbr title="PID">11364</abbr> <abbr title="Action/Event">D</abbr> <abbr title="RWBS (D) field">W</abbr> <abbr title="starting block + blocks">0 + 8</abbr> <abbr title="process">[kworker/7:2]</abbr> |
8,96 7 107 0.374456639 47 C W 0 + 8 [0] | 8,96 7 107 0.374456639 47 C W 0 + 8 [0] | ||
Revision as of 06:13, 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]
Event can be a combination of
R : Read W : Write D : Block discard B : Barrier operation S : Synchronous operations
