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From: Yuji Ito <yuji@imagine-orb.com>
Date: Wed, 10 May 2017 19:01:27 +0900
Message-ID: <CALE39-dNet3scUTTQfvGyAuQt_N1oMQ_CqZ3QeRo-uHTt1j_0A@mail.gmail.com>
Subject: Difference between yum and git
To: user@cassandra.apache.org
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archived-at: Wed, 10 May 2017 10:01:33 -0000

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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/
cassandra/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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<div dir=3D"ltr">Hi all,<div><br></div><div>I&#39;m trying a simple perform=
ance test.</div><div>The test requests select operations (CL.SERIAL or CL.Q=
UORUM) by increasing the number of threads.</div><div>There is the differen=
ce of the performance between C* installed by yum and C* which I built by m=
yself.</div><div>What causes the difference?</div><div><br></div><div>I use=
 C* 2.2.8.</div><div>One of them was installed by yum (# yum install cassan=
dra22).</div><div>Another was acquired by git from <a href=3D"https://githu=
b.com/apache/cassandra/tree/cassandra-2.2.8" target=3D"_blank">https://gith=
ub.com/apache/<wbr>cassandra/tree/cassandra-2.2.8</a> and built it by mysel=
f.</div><div>I changed cassandra.yaml to set `commitlog_sync: batch` and `c=
ommitlog_sync_batch_window_<wbr>in_ms: 2`.</div><div><br></div><div>My envi=
ronment:</div><div>- a cluster has 3 nodes</div><div>- node: AWS EC2 m4.lar=
ge with 200 IOPS EBS volume</div><div><div>- Replication Factor: 3</div></d=
iv><div>- 10000 rows</div><div><br></div><div>Result:</div><div><div>** yum=
</div><div>=3D=3D=3D=3D select (CL.SERIAL) =3D=3D=3D=3D</div><div>threads =
=C2=A0operations/sec</div><div>1 =C2=A0 188</div><div>2 =C2=A0 156</div><di=
v>4 =C2=A0 434</div><div>8 =C2=A0 396</div><div>16 =C2=A0837</div><div>32 =
=C2=A01176</div><div>64 =C2=A02206</div><div>128 4115</div><div>256 7272</d=
iv></div><div><br></div><div><div>** git</div><div>=3D=3D=3D=3D select (CL.=
SERIAL) =3D=3D=3D=3D</div><div>threads =C2=A0operations/sec</div><div>1 =C2=
=A0 192</div><div>2 =C2=A0 162</div><div>4 =C2=A0 264</div><div>8 =C2=A0 44=
6</div><div>16 =C2=A0733</div><div>32 =C2=A01114</div><div>64 =C2=A01715</d=
iv><div>128 2776</div><div>256 3920</div><div><br></div><div><div>** yum</d=
iv><div>=3D=3D=3D=3D select (CL.QUORUM) =3D=3D=3D=3D</div><div>threads =C2=
=A0operations/sec</div><div>1 =C2=A0 434</div><div>2 =C2=A0 909</div><div>4=
 =C2=A0 1481</div><div>8 =C2=A0 1904</div><div>16 =C2=A02666</div><div>32 =
=C2=A03106</div><div>64 =C2=A03555</div><div>128 5000</div><div>256 9014</d=
iv></div><div><br></div><div>** git</div><div>=3D=3D=3D=3D select (CL.QUORU=
M) =3D=3D=3D=3D</div><div>threads =C2=A0operations/sec</div><div>1 =C2=A0 6=
66</div><div>2 =C2=A0 1538</div><div>4 =C2=A0 2500</div><div>8 =C2=A0 3333<=
/div><div>16 =C2=A04210</div><div>32 =C2=A05333</div><div>64 =C2=A06597</di=
v><div>128 7356</div><div>256 8075</div><div><br></div></div><div>Thanks,</=
div><div>Yuji</div><div><br></div></div>

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