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From Shing Hing Man <mat...@yahoo.com>
Subject Apache Cassandra 2.1.0 : cassandra-stress performance discrepancy between SSD and SATA drive
Date Fri, 26 Sep 2014 21:39:26 GMT
Hi,
  I have run   cassandra-stress write and  cassandra-stress read  on my office PC and on my
home PC. 

Office PC : Intel Core i7-4479, 8  virtual core, 16G RAM, 500G SSD Home PC : Intel Xeon E3-1230V3,
8 virtual core,  8G RAM, 500G SATA disk.

From the cassandra-stress result (please see below), it seems Cassandra ismore than 100% performant
on my home PC than the office PC. I am expecting the other way around, as my office PC has
much  better hardware. 


Office : Intel Core i7-4479, 9  virtual cores, 16G RAM, 500G SSDcauchy:~/installed/cassandra/tools/bin>
./cassandra-stress write 
Running with 8 threadCount
Results:
op rate                   : 11264
partition rate            : 11264
row rate                  : 11264
latency mean              : 0.7
latency median            : 0.4
latency 95th percentile   : 0.9
latency 99th percentile   : 1.6
latency 99.9th percentile : 5.3
latency max               : 325.3
Total operation time      : 00:02:40


cauchy:~/installed/cassandra/tools/bin> ./cassandra-stress read 
Running with 8 threadCount
Results:
op rate                   : 13702
partition rate            : 13702
row rate                  : 13702
latency mean              : 0.5
latency median            : 0.5
latency 95th percentile   : 0.8
latency 99th percentile   : 1.4
latency 99.9th percentile : 3.4
latency max               : 67.1
Total operation time      : 00:00:30

---------------------------------------------------
--------------------------------------------------

Home: Intel Xeon E3-1230V3, 8 virtual core,  8G RAM, 500G SATA disk.

matmsh@gauss:~/installed/cassandra/tools/bin> ./cassandra-stress write
Running with 8 threadCount

Results:
op rate                   : 25181
partition rate            : 25181
row rate                  : 25181
latency mean              : 0.3
latency median            : 0.2
latency 95th percentile   : 0.3
latency 99th percentile   : 0.5
latency 99.9th percentile : 16.7
latency max               : 331.0
Total operation time      : 00:03:24

gauss:~/installed/cassandra/tools/bin> ./cassandra-stress read
Results:
op rate                   : 35338
partition rate            : 35338
row rate                  : 35338
latency mean              : 0.2
latency median            : 0.2
latency 95th percentile   : 0.3
latency 99th percentile   : 0.4
latency 99.9th percentile : 1.1
latency max               : 17.7
Total operation time      : 00:00:30


Is the above result expected ?
Thanks in advance for any suggestions !

Shing
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