I'm using the blktrace tool to measure the input performance of the write and rewrite. The blktrace produces many files during the write. Do I need to merge all the files into a single file to give it to the blkparse to produce the readable format of the output.
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Whhy is this downvoted. May be the person downvoted can give the reason why so. – Angus Feb 26 '14 at 05:26
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How do you start the blktrace? What is the task you are measuring? – osgx Mar 01 '14 at 23:31
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By running blktrace as root
blktrace /dev/sda
after pressing Cntrl+c, blktrace will generate a set of files
[sda.blktrace.0, sda.blktrace.1, ..., sda.blktrace.(Ncpus-1)]
according to the number of cpus your OS can see. To parse the files, you can use blkparse for all files simultaneously
blkparse sda.blktrace.0 sda.blktrace.1 ... sda.blktrace.(Ncpus-1)
or
blkparse sda.blktrace.*
Hope it helps.
mrcl
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