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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 33250] New: - Out of Memory Error while Stress Testing
Date Wed, 26 Jan 2005 17:02:49 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=33250

           Summary: Out of Memory Error while Stress Testing
           Product: POI
           Version: 2.5
          Platform: PC
        OS/Version: Windows 2000
            Status: NEW
          Severity: major
          Priority: P2
         Component: HSSF
        AssignedTo: poi-dev@jakarta.apache.org
        ReportedBy: sumit_machwe@external.mckinsey.com


Hi,
My application uses POI to generate MS Excel Workbooks. Average Size of a 
Workbook is 30 Col X 1000 Rows X 25 Worksheets (file size is approx 5-6 MB). 
 
While doing a stress testing with 30 Concurrent user load, application started 
throwing java.lang.OutfMemoryError
We noticed that there was a Heap Dump and the available memory did not return 
back to normal. It has been noticed that  
org.apache.poi.hssf.usermodel.HSSFSheet objects are taking almost 100 MB space.

Details of development environment are:
#JVM IBM (Wepsphere application Server 5.1)
#2 GB available memory (Dedicated)before starting the stress test.
#Initial heap size, as set by -Xms paramters is set to 256M.

Stress testing process is pretty decent and it closes all 30 sessions after 
the excel file is generated in each one of them.. so I don't suspect 
application holding any large objects for a long duration. 

Please adivce if this is a known issue with HSSF.

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