stress.py enhancements
----------------------
Key: CASSANDRA-542
URL: https://issues.apache.org/jira/browse/CASSANDRA-542
Project: Cassandra
Issue Type: Improvement
Reporter: Scott White
Priority: Minor
Fix For: 0.5
this patch makes the following improvements over the existing stress.py (with
the patch in CASSANDRA-514):
1) uses a shared memory array to rectify the fact that with the multiproc
change in CASSANDRA-514 the updates to the op counts are not getting pooled
correctly
2) optionally allows the client to do round robin requests thus preventing
cassandra from having to take on extra load balancing requests
3) refactors code so there is no duplicate code making it easier to support any
new operations people may want to add
4) stress.py can now be used to generate performance graphs. It adds one new
field which is the total number of operations completed for each interval which
is required to show aggregate performance across intervals. It also does an
append so that data points can be collected for each interval. Furthermore, the
date foramt is now CSV so for easy import into Excel, R, etc.
Generating performance graphs can be generated in 5 easy steps:
1. nosetests --tests=system.stress:Stress.insert &
2. tail -f /tmp/progress_insert (just to watch and make sure it's working)
3. fire up R (www.r-project.org/)
4. w = read.table("/tmp/progress_insert",sep=",")
5. plot(w[,3]/60,w[,2],ylim=c(0,10000),xlab="Elapsed time
(minutes)",ylab="Writes / sec", type='l')
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