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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By running blktrace as root
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
or
Hope it helps.