Re: Events out of order

[Phillip Susi <psusi@ubuntu.com>]

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On 12/30/2014 11:29 PM, Alireza Haghdoost wrote:
> Seems to me like you don't run blktrace and blkparse
> appropriately. blktrace stores IO trace in multiple files where
> each file is associated to a CPU core. However, you force the
> output of blktrace to redirect into a single file. This make some
> timing Confusion for blkparse in the next step. You are using live
> blkparse option (-i -) inappropriately. If you want to run live
> blkparse, you need to feed it through blktrace pipe. Like: 
> #blktrace -d /dev/sda -o - | blkparse -i -
> 
> If you want to store trace in a file then parse it offline, you
> need to use --input option of blkparse.

Whether it is piped directly, or buffered in a file on disk makes no
difference; blkparse sees exactly the same input byte for byte, and
produces the same output.  The man page recommends this interactive
method and doesn't mention that it borks up the ordering, but I
suppose I can try it the other way and see if that helps.  If the
interactive method doesn't work correctly it should either be fixed or
the man page should mention this and not recommend its use.

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