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Posted to jmeter-dev@jakarta.apache.org by bu...@apache.org on 2009/11/22 06:58:17 UTC
DO NOT REPLY [Bug 48259] New: Improve StatCalculator performance by
using HashMap
https://issues.apache.org/bugzilla/show_bug.cgi?id=48259
Summary: Improve StatCalculator performance by using HashMap
Product: JMeter
Version: Nightly (Please specify date)
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: Main
AssignedTo: jmeter-dev@jakarta.apache.org
ReportedBy: andrey.hitrin@gmail.com
Created an attachment (id=24582)
--> (https://issues.apache.org/bugzilla/attachment.cgi?id=24582)
Use HashMap for keeping values distribution instead of ArrayList
There is no actually need to store *each* value separately in StatCalculator
class. It's enough to save only counter of occurrences for every value. I
propose HashMap class for that instead of ArrayList.
HashMap provides several major benefits:
- It occupies less memory than ArrayList, especially for large data sets,
because every inserted value will be kept within just one pair (key-value).
- It has faster data insert (there is no need to call
Collections.binarySearch() for every addValue(), insert into HashMap has O(1)
complexity)
- It still stays quite fast for reading. It calls for sorting in modified
getPercentPoint() method, but sorts only keys. A number of unique keys is
usually much less than total count of inserted values.
Sorry, I didn't check modified StatCalculator on real data yet, just run JMeter
tests. I will do it after the weekend. But I think it will work fine.
I worked at SVN build 883037.
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DO NOT REPLY [Bug 48259] Improve StatCalculator performance by using
HashMap
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=48259
Sebb <se...@apache.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #1 from Sebb <se...@apache.org> 2009-12-14 16:59:20 UTC ---
Thanks for the patch.
This has been applied to SVN:
URL: http://svn.apache.org/viewvc?rev=890589&view=rev
Log:
Bug 48259 - Improve StatCalculator performance by using HashMap
I made a few changes:
- instead of sorting the keys and using last or first to get max and min the
code keeps track of the values.
- the sorted TreeSet is cached
- use MutableLong (Commons LANG) instead of Long
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