Python client performance issue

Mike Stoddart stodge at
Fri Feb 18 09:24:08 EST 2011

Much better - using simplejson and return_body=False reduces CPU usage
to 0.5-0.7%. Which is more consistent with other DBs.

Thanks for your help!

On Mon, Feb 14, 2011 at 8:09 AM, Mike Stoddart <stodge at> wrote:
> I added some code to my system to test writing data into Riak. I'm
> using the Python client library with protocol buffers. I'm writing a
> snapshot of my current data, which is one json object containing on
> average 60 individual json sub-objects. Each sub object contains about
> 22 values.
>                # Archived entry. ts is a formatted timestamp.
>                entry =, data=data)
>                # Now write the current entry.
>                entry ="current", data=data)
> I'm writing the same data twice; the archived copy and the current
> copy, which I can easily retrieve later. Performance is lower than
> expected; top is showing a constant cpu usage of 10-12%.
> I haven't decided to use Riak; this is to help me decide. But for now
> are there any optimisations I can do here? A similiar test with
> MongoDB shows a steady cpu usage of 1%. The cpu usages are for my
> client, not Riak's own processes. The only differences in my test app
> is the code that writes the data to the database. Otherwise all other
> code is 100% the same between these two test apps.
> Any suggestions appreciated.
> Thanks
> Mike

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