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From Michael Greene <michael.gre...@gmail.com>
Subject Re: Cassandra performance
Date Mon, 17 Aug 2009 20:12:41 GMT
What sort of slicing are you doing?  This will impact CPU usage.

Michael

Huming Wu<huming.wu@gmail.com> wrote:
> I did some performance test and I am not impressed :). The data set is
> 880K unique keys and there are 4 columns with 2 columns being string
> and the other 2 are integers (from client side, to the backend it is
> all byte[]). After high throughput set (very fast), 220MB are injected
> via batch_insert. I restarted the cassandra and started a client
> calling get_slice at 5000rps with 100 connections.
[...]
> a) Read is too CPU intensive. With the actual peak rps around 3000,
> the CPU usage is 70% already. I doubt it I can double the rps and have
> the same read latency.
[...]
> Any comments on those numbers?

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