Hi Kevin,
Thanks for the reply !
I do not know the exact brand of SSD in my office PC. But the SSD is only 1
year old, and it is far from full.
On both of office PC and home PC, I untared Apache Cassandra 2.1.0 and then
run "cassandra -f " with the default config, then
run cassandra-stress
Both PCs have Oracle Java 1.7.0_40.
I have noticed there are some parameters for SSD in cassandra.yaml, which I
have adjusted, but with no improvement.
It puzzles me Cassandra on my office PC, with far better hardware, could be
100% slower than my home PC.
Shing
On Saturday, 27 September 2014, 5:12, Kevin Burton <[email protected]> wrote:
What SSD was it? There are a lot of variability in terms of SSD performance.
1. Is it a new vs old SSD? Old SSDs can become slower if they’re really worn
out
2. was the office SSD near capacity holding other data?
3. what models were they?
SSD != SSD… there is a massive amount of performance variability out there.
… also … more data is needed. JDK versions the same? cassandra versions the
same?
what about the config?
On Fri, Sep 26, 2014 at 2:39 PM, Shing Hing Man <[email protected]> wrote:
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 is
>more 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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