On a single processor EC2 instance, however, multiprocessing would be
useless.
Ken....
On 2/13/2013 5:29 PM, Ben Bromhead wrote:
If you are using CPython (most likely) remember to use the
multiprocessing interface rather than multithreading to avoid the
global interpreter lock.
Cheers
Ben
On Thu, Feb 14, 2013 at 4:35 AM, <ka...@comcast.net
<mailto:ka...@comcast.net>> wrote:
I'm not using multi-threads/processes. I'll try multi-threading to
see if I get a boost.
Thanks.
Ken....
------------------------------------------------------------------------
*From: *"Tyler Hobbs" <ty...@datastax.com <mailto:ty...@datastax.com>>
*To: *user@cassandra.apache.org <mailto:user@cassandra.apache.org>
*Sent: *Wednesday, February 13, 2013 11:06:30 AM
*Subject: *Re: Write performance expectations...
2500 inserts per second is about what a single python thread using
pycassa can do against a local node. Are you using multiple
threads for the inserts? Multiple processes?
On Wed, Feb 13, 2013 at 8:21 AM, Alain RODRIGUEZ
<arodr...@gmail.com <mailto:arodr...@gmail.com>> wrote:
Is there a particular reason for you to use EBS ? Instance
Store are recommended because they improve performances by
reducing the I/O throttling.
An other thing you should be aware of is that replicating the
data to all node reduce your performance, it is more or less
like if you had only one node (at performance level I mean).
Also, writing to different datacenters probably induce some
network latency.
You should give the EC2 instance type (m1.xlarge / m1.large /
...) if you want some feedback about the 2500 w/s, and also
give the mean size of your rows.
Alain
2013/2/13 <ka...@comcast.net <mailto:ka...@comcast.net>>
Hello,
New member here, and I have (yet another) question on
write performance.
I'm using Apache Cassandra version 1.1, Python 2.7 and
Pycassa 1.7.
I have a cluster of 2 datacenters, each with 3 nodes, on
AWS EC2 using EBS and the RandomPartioner. I'm writing to
a column family in a keyspace that's replicated to all
nodes in both datacenters, with a consistency level of
LOCAL_QUORUM.
I'm seeing write performance of around 2500 rows per second.
Is this in the ballpark for this kind of configuration?
Thanks in advance.
Ken....
--
Tyler Hobbs
DataStax <http://datastax.com/>
