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Posted to commits@harmony.apache.org by "Paulex Yang (JIRA)" <ji...@apache.org> on 2007/05/29 08:59:16 UTC
[jira] Resolved: (HARMONY-3842) [classlib][io][perf]
CharArrayWriter.write(int) method works slowly
[ https://issues.apache.org/jira/browse/HARMONY-3842?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Paulex Yang resolved HARMONY-3842.
----------------------------------
Resolution: Fixed
Ruth, patch applied at r542432, thanks a lot.
Vera, please verify, thanks.
I also wonder if the methods in CharArrayWriter needs to be locked or not, because specification says nothing on thread safety, so maybe the synchronized can be removed?
> [classlib][io][perf] CharArrayWriter.write(int) method works slowly
> -------------------------------------------------------------------
>
> Key: HARMONY-3842
> URL: https://issues.apache.org/jira/browse/HARMONY-3842
> Project: Harmony
> Issue Type: Bug
> Components: Classlib
> Environment: Windows and Linux
> Reporter: Vera Petrashkova
> Assignee: Paulex Yang
> Priority: Minor
> Attachments: Harmony-3842.diff
>
>
> The following test demonstrates that CharArrayWriter.write(int) on DRLVM works slower than on RI.
> It is needed
> --------------CharArrayWriterTest.java-------------------
> import java.io.*;
> public class CharArrayWriterTest {
> public static void main (String[] args) {
> int size = 100000;
> try {
> long startTime = System.currentTimeMillis();
> CharArrayWriter ww = new CharArrayWriter();
> for (int i = 0; i < size; i++) {
> ww.write(i);
> if (i % 10000 == 0) {
> System.err.println("Step: "+i);
> }
> }
> ww.close();
> long endTime = System.currentTimeMillis();
> System.err.println("Size: " + size+" time: "+(endTime - startTime));
> } catch (Throwable e) {
> e.printStackTrace();
> }
> }
>
> }
> -----------------------------------------
> Output on Linux:
> ==============
> java version "1.5.0_06"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
> Java HotSpot(TM) Server VM (build 1.5.0_06-b05, mixed mode)
>
> Step: 0
> Step: 10000
> Step: 20000
> Step: 30000
> Step: 40000
> Step: 50000
> Step: 60000
> Step: 70000
> Step: 80000
> Step: 90000
> Size: 100000 time: 40
> Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software Foundation or its licensors, as applicable.
> java version "1.5.0"
> pre-alpha : not complete or compatible
> svn = r536744, (May 10 2007), Linux/ia32/gcc 3.3.3, release build
> http://incubator.apache.org/harmony
> Step: 0
> Step: 10000
> Step: 20000
> Step: 30000
> Step: 40000
> Step: 50000
> Step: 60000
> Step: 70000
> Step: 80000
> Step: 90000
> Size: 100000 time: 7360
> Output on Windows:
> ===================
> java version "1.5.0_06"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
> Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode)
> Step: 0
> Step: 10000
> Step: 20000
> Step: 30000
> Step: 40000
> Step: 50000
> Step: 60000
> Step: 70000
> Step: 80000
> Step: 90000
> Size: 100000 time: 15
> Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software Foundation or its l
> icensors, as applicable.
> java version "1.5.0"
> pre-alpha : not complete or compatible
> svn = r536744, (May 10 2007), Windows/ia32/msvc 1310, release build
> http://incubator.apache.org/harmony
> Step: 0
> Step: 10000
> Step: 20000
> Step: 30000
> Step: 40000
> Step: 50000
> Step: 60000
> Step: 70000
> Step: 80000
> Step: 90000
> Size: 100000 time: 6140
> This issue causes the failure of the following test from Stress test suite (http://issues.apache.org/jira/browse/HARMONY-3536)
> stress/org/apache/harmony/test/stress/api/java/io/stress/readers/CharArrayReader/CharArrayReaderWriterStressTest
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