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From Neha Narkhede <neha.narkh...@gmail.com>
Subject Re: perf testing
Date Mon, 24 Oct 2011 19:27:06 GMT
Thanks for starting this discussion Jay !

>> dstat - This is the existing perf tool to get read/write/fs stats

My only concern about dstat is that it doesn't seem to give some
important IO stats like

avgrq-sz - size of the write request after merging several writes
together into one big write ( indicates how sequential the IO is)
wrqm_s - write requests merged per sec (also, could indicate how much
of the total IO is sequential and can be grouped into one write on the
w/s - write IO requests per sec (indicates how many flushes the kafka
broker is doing per sec)
% busy - indicates how busy the disks are.

At the very least, %busy is what we would like to know. Maybe I
couldn't pass the right options to dstat.

Does anyone have more ideas about dstat or some other perf tool,
preferably one that would work on Linux ?


On Mon, Oct 24, 2011 at 12:06 PM, Jay Kreps <jay.kreps@gmail.com> wrote:
> Neha and I have been doing so work on perf testing. My past experience with
> these perf and integration testing frameworks is that
>   1. This kind of testing is extremely important. At least as important as
>   unit testing. A lot of the bugs that are caught in production could be
>   caught be good integration tests but likely will never be caught be unit
>   tests.
>   2. It is hard to get all your pieces scripted up so that you can fully
>   automate the perf analysis you want to do and run this every day.
>   3. It requires dedicated hardware that doesn't change from day to day.
>   4. One of the biggest problems is that perf code is always kind of an
>   afterthought. As a result one never gets to a framework that is good enough
>   to use. Instead you keep re-writing the same test harnesses over and over
>   but with little tweaks for each new test you need to run, then throwing that
>   code away because it is so specific it can't be reused.
> To hopefully help I started a wiki where we could work out some ideas for
> this. The idea is basically just to dump out all the stats we have now to
> CSV and do some analysis in R. Then script this up in a way that we can
> craft "test scenarios" and run a bunch of these different configurations.
> Wiki here:
> https://cwiki.apache.org/confluence/display/KAFKA/Performance+testing
> Would love to hear people's thoughts.
> -Jay

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