[jira] Assigned: (AXIS2-2574) usage of attachments is very slow when they are cached on disk (Server-Side)

["Thilina Gunarathne (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AXIS2-2574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thilina Gunarathne reassigned AXIS2-2574:
-----------------------------------------

    Assignee: Thilina Gunarathne

> usage of attachments is very slow when they are cached on disk (Server-Side)
> ----------------------------------------------------------------------------
>
>                 Key: AXIS2-2574
>                 URL: https://issues.apache.org/jira/browse/AXIS2-2574
>             Project: Axis 2.0 (Axis2)
>          Issue Type: Bug
>    Affects Versions: 1.1.1
>         Environment: SUN JRE 5.0 Update 11, Apache Tomcat 5.5.23, Windows XP Professional
>            Reporter: Dirk Niededir
>         Assigned To: Thilina Gunarathne
>
> I have implemented a small AXIOM based Service using the AXIS2 1.1.1 WAR-file.
> I am using the DataHandler to receive big Byte-Arrays (base64binary). Using MTOM, AXIS2 is converting them to attachments. This works fine using small Byte-Arrays. To avoid a OutOfMemoryError, I enabled the file based cache using the parameters cacheAttachments=true, attachmentDIR=cachedir and sizeThreshold=30000 in the axis2.conf. This still works fine but very slow, if the size is greater than sizeThreshold. I know File access should be slower than using RAM. But this works much slower than it should and the CPU is at maximum. 
> Using the Windows-Tool "Process Monitor" ( http://www.microsoft.com/technet/sysinternals/utilities/processmonitor.mspx ), I saw that the axis*.att files are written in blocks with size=1. This might be a hint.
> For this I have written a small test, which writes a 50MB file to disk either buffered or unbuffered:
> --------------------------
> 	File file = new File( "C:/java/temp/test.txt");
> 	if( file.exists())
> 		file.delete();
> 	file.createNewFile();
> 	long startTime = System.currentTimeMillis();
> 	
> 	OutputStream fos = new FileOutputStream( file);
> 	boolean buffered = true;
> 	if( buffered)
> 		fos = new BufferedOutputStream( fos);
> 	
> 	int count = 0;
> 	while( count < 50*1000000) {
> 		count++;
> 		fos.write( 'a');
> 	}
> 	fos.close();
> 	
> 	long endTime = System.currentTimeMillis();
> 	
> 	System.out.println("time = "+(endTime-startTime)+"ms");
> --------------------------
> if the buffered-flag is false, then time = 203360ms and CPU ~ 90%
> if the buffered-flag is true,  then time = 2763ms       and CPU ~ 30%
> The buffered version is 73.6 times faster with a much lower CPU utilization!
> This confirms to the hint. So decoration of the FileOutputStream for the axis*.att-Files with a BufferedOutputStream will fix this "bug". 
> Maybe it is a Windows-Problem, but the decoration will not be a disadvantage for other systems.

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