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From bugzi...@apache.org
Subject [Bug 58915] New: memory eaters
Date Sat, 23 Jan 2016 12:31:55 GMT
https://bz.apache.org/bugzilla/show_bug.cgi?id=58915

            Bug ID: 58915
           Summary: memory eaters
           Product: POI
           Version: 3.13-FINAL
          Hardware: PC
            Status: NEW
          Severity: normal
          Priority: P2
         Component: SXSSF
          Assignee: dev@poi.apache.org
          Reporter: givemejob@ya.ru

Created attachment 33480
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=33480&action=edit
memory eaters

We did stress test:
 - Tomcat 7 Xmx100m
 - JVM 7
 - on request we start 10 threads and each thread writes large xlsx file with
10 rows sliding window (SXSSF) to the file

Library we use:
 - jxls 2.8
 - jxls-poi 1.0.7
 - Apache POI 3.13 (poi, poi-ooxml, poi-ooxml-schemas)
 - xmlbeans 2.6.0

It was assumed that window should reduce memory consumption to volume memory
needed for window. 

For large xlsx files we can see what objects Xobj$ElementXobj, Xobj$AttrXobj,
STRefImpl, CTMergeCellImpl eat memory.

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