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From "Jim Yu (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-6068) [java6][luni] Improve Integer.toString(int) performance
Date Thu, 08 Jan 2009 09:01:03 GMT
[java6][luni] Improve Integer.toString(int) performance
-------------------------------------------------------

                 Key: HARMONY-6068
                 URL: https://issues.apache.org/jira/browse/HARMONY-6068
             Project: Harmony
          Issue Type: Improvement
          Components: Classlib
    Affects Versions: 5.0M8
            Reporter: Jim Yu
             Fix For: 5.0M9


I very agree with Aleksey Shipilev' comment [1] for JIRA HARMONY-6056 as following, so I implement
an optimized algorithm for  Integer.toString(int) method. Thanks to Aleksey Shipilev's benchmark,
 here are the test results[2] on my windows platform.
[1] "Ok, we can implement the in-place Integer.toString() and specialize
the radix-10 conversion in Integer. Then Classlib performance guys
might use the inplace conversion to optimize StringBuilder performance
or even catch the concatenation like J9 does.
My idea is to share whatever optimization between all VMs that use the Classlib."
[2] 
Result for Harmony java6 branch:
(String)base + (int)add:
-------------------------------------------
 base length (vars with rows): 0..2..10
  add length (vars with cols): 0..2..10

 loop duration = 100 msecs
 target variance = 0.05

ops/msec, the more the better:
6721, 6096, *4650, *3846, *3178,
*8080, *5833, *4447, 3731, 3048,
*7985, *5848, 4788, 3727, *3114,
*7891, 5592, *4389, *3560, 3048,
8388, 5607, *4522, 3727, 3051,

After applied my patch:
(String)base + (int)add:
-------------------------------------------
 base length (vars with rows): 0..2..10
  add length (vars with cols): 0..2..10

 loop duration = 100 msecs
 target variance = 0.05

ops/msec, the more the better:
8322, 6721, 4791, 4788, 4788,
8388, 6721, 5156, *5012, 4797,
8388, 6707, 5161, *4963, 4795,
8388, 6707, *5126, 4802, 4788,
*8048, 6700, *5021, 4802, *4687,



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