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Date: Sat, 19 Nov 2011 17:58:15 -0800 (PST)
From: Kent Tong <freemant2000@yahoo.com>
Reply-To: Kent Tong <freemant2000@yahoo.com>
Subject: read performance problem
To: "user@cassandra.apache.org" <user@cassandra.apache.org>
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Hi,=0A=0AOn my computer with 2G RAM and a core 2 duo CPU E4600 @ 2.40GHz, I=
 am testing the=A0=0Aperformance of=A0Cassandra. The write performance is g=
ood: It can write a million records=A0=0Ain 10 minutes.=A0However, the quer=
y performance is poor and it takes 10 minutes to read=A0=0A10K=A0records=A0=
with sequential keys from 0 to 9999 (about 100 QPS). This=A0is far away fro=
m=A0=0Athe 3,xxx=A0QPS found on the net.=0A=0ACassandra decided to use 1G a=
s the Java heap size which seems to be fine as at the end=0Aof the benchmar=
k the swap was barely used (only 1M used).=0A=0AI understand that my comput=
er may be not as powerful as those used in the other=A0benchmarks,=A0=0Abut=
 it shouldn't be that far off (1:30), right?=0A=0AAny suggestion? Thanks in=
 advance!=0A
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:ar=
ial, helvetica, sans-serif;font-size:12pt"><div>Hi,</div><div><br></div><di=
v>On my computer with 2G RAM and a core 2 duo CPU E4600 @ 2.40GHz, I am tes=
ting the&nbsp;</div><div>performance of&nbsp;Cassandra. The write performan=
ce is good: It can write a million records&nbsp;</div><div>in 10 minutes.&n=
bsp;However, the query performance is poor and it takes 10 minutes to read&=
nbsp;</div><div>10K&nbsp;records&nbsp;with sequential keys from 0 to 9999 (=
about 100 QPS). This&nbsp;is far away from&nbsp;</div><div>the 3,xxx&nbsp;Q=
PS found on the net.</div><div><br></div><div>Cassandra decided to use 1G a=
s the Java heap size which seems to be fine as at the end</div><div>of the =
benchmark the swap was barely used (only 1M used).</div><div><br></div><div=
>I understand that my computer may be not as powerful as those used in the =
other&nbsp;benchmarks,&nbsp;</div><div>but it shouldn't be that far
 off (1:30), right?</div><div><br></div><div>Any suggestion? Thanks in adva=
nce!</div><div><br></div></div></body></html>
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