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From Yuji Ito <y...@imagine-orb.com>
Subject Re: Difference between yum and git
Date Thu, 11 May 2017 02:54:05 GMT
Hi Joaquin,

> Were both tests run from the same machine at close the same time?
Yes. I run the both tests within 30 min.
I retried them today. The result was the same as yesterday.

The test run on the same instances and the same Java.

Thanks,
Yuji


On Thu, May 11, 2017 at 3:27 AM, Joaquin Casares <joaquin@thelastpickle.com>
wrote:

> Hi Yuji,
>
> Were both tests run from the same machine at close the same time? If not,
> noisy neighbors may be affecting your performance on different AWS
> instances.
>
> You should verify that you're using the same version of Java during both
> tests.
>
> Also, ensure that you're using the same test instance (that is not running
> Cassandra) to connect to both Cassandra clusters.
>
> Cheers,
>
> Joaquin
>
> Joaquin Casares
> Consultant
> Austin, TX
>
> Apache Cassandra Consulting
> http://www.thelastpickle.com
>
> On Wed, May 10, 2017 at 5:01 AM, Yuji Ito <yuji@imagine-orb.com> wrote:
>
>> Hi all,
>>
>> I'm trying a simple performance test.
>> The test requests select operations (CL.SERIAL or CL.QUORUM) by
>> increasing the number of threads.
>> There is the difference of the performance between C* installed by yum
>> and C* which I built by myself.
>> What causes the difference?
>>
>> I use C* 2.2.8.
>> One of them was installed by yum (# yum install cassandra22).
>> Another was acquired by git from https://github.com/apache/cass
>> andra/tree/cassandra-2.2.8 and built it by myself.
>> I changed cassandra.yaml to set `commitlog_sync: batch` and
>> `commitlog_sync_batch_window_in_ms: 2`.
>>
>> My environment:
>> - a cluster has 3 nodes
>> - node: AWS EC2 m4.large with 200 IOPS EBS volume
>> - Replication Factor: 3
>> - 10000 rows
>>
>> Result:
>> ** yum
>> ==== select (CL.SERIAL) ====
>> threads  operations/sec
>> 1   188
>> 2   156
>> 4   434
>> 8   396
>> 16  837
>> 32  1176
>> 64  2206
>> 128 4115
>> 256 7272
>>
>> ** git
>> ==== select (CL.SERIAL) ====
>> threads  operations/sec
>> 1   192
>> 2   162
>> 4   264
>> 8   446
>> 16  733
>> 32  1114
>> 64  1715
>> 128 2776
>> 256 3920
>>
>> ** yum
>> ==== select (CL.QUORUM) ====
>> threads  operations/sec
>> 1   434
>> 2   909
>> 4   1481
>> 8   1904
>> 16  2666
>> 32  3106
>> 64  3555
>> 128 5000
>> 256 9014
>>
>> ** git
>> ==== select (CL.QUORUM) ====
>> threads  operations/sec
>> 1   666
>> 2   1538
>> 4   2500
>> 8   3333
>> 16  4210
>> 32  5333
>> 64  6597
>> 128 7356
>> 256 8075
>>
>> Thanks,
>> Yuji
>>
>>
>

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