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Salvatore" Date: Wed, 4 Jan 2017 15:27:45 +0000 Message-ID: Subject: Cassandra CPU perfomance To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=001a114743c85eb8ed0545466e5d archived-at: Wed, 04 Jan 2017 15:28:10 -0000 --001a114743c85eb8ed0545466e5d Content-Type: text/plain; charset=UTF-8 Hi, I deployed a Cassandra 2.2 ring composed by 4 nodes in the cloud with 8 vCPU and 8GB of ram. I am running some tests now with cassandra-stress and YCSB tools to test its performance. I am mainly interested in read requests with a small amount of write requests (95%/5%). Running the experiments, I noticed that even setting a high number of threads (or clients) the CPU (and disk) does not saturate, but still always around the 60% of utilisation. I am trying to figure out where is the bottleneck in my system. From the hardware point of view it seems all ok to me. I also looked into the Cassandra configuration file to see if there are some tuning parameters to increase the system throughput. I increase the value of concurrent_read/write parameter, but it doesn't increase the performance. The log file also does not contain any warning. What it could be that is limiting my system? Thanks --001a114743c85eb8ed0545466e5d Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

Hi,

I deployed a Cass= andra 2.2 ring composed by 4 nodes in the cloud with 8 vCPU and 8GB of ram.= I am running some tests now with cassandra-stress and YCSB tools to test i= ts performance. I am mainly interested in read requests with a small amount= of write requests (95%/5%).

Running the experiments, I= noticed that even setting a high number of threads (or clients) the CPU (a= nd disk) does not saturate, but still always around the 60% of utilisation.=

I am trying to figure out where is the bottleneck in m= y system. From the hardware point of view it seems all ok to me.

I also looked into the Cassandra configuration file to see if the= re are some tuning parameters to increase the system throughput. I increase= the value of concurrent_read/write parameter, but it doesn't increase = the performance. The log file also does not contain any warning.

What it could be that is limiting my system?=C2=A0

Thanks

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