Re: [project-voldemort] Systematic error in the performance tool

[Arunachalam]

I have never looked at the voldemort performance tool.

But can you do the initial investigation ?

Where are you hitting the bottlenecks ? CPU/ Memory or Network. You can modify the performance tool to start with gc log dump and see if the client GC pause time aligns with the peak.

Send me what you find and we will proceed from there.

Thanks,

Arun.

Couple of things I can think of is, client GCing and Client 

On Wed, Mar 4, 2015 at 12:26 PM, Paolo Forte <forte....@gmail.com> wrote:

Hi everybody, I am trying to create a load generator and a sensor based on the built-in performance tool. The scenario is the following:

I run a server on the machine A:

bin/voldemort-server.sh config/single_node_cluster

In the same local network I run the performance tool on the machine B:

./voldemort-performance-tool.sh --interval 1 --iterations 1 --metric-type summary --nuconnections-per-node 100 --percent-cached 0 -r 50 -w 50 --record-selection uniform --store-name test --target-throughput 1000 --threads 16 --url tcp://172.31.212.89:6666 --value-size 4000 --ops-count 999999

Periodically outliers appear and the measured values sky high. The period seems to be quite stable, I tried on different machines and I stopped all the background services.

What can it be? How can it be solved?

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