RE: More than 2GB heap with 64 bit JVM?

We use SXSSF method whenever we can. In this case, we're pulling in a
template spreadsheet, so I couldn't find a good way to use SXSSF. I'm also
not using the "java" command, so extentions like -XMX3G are a bit foreign
to me. I'm implementing the JVM through RPG.





From: Mitch Gallman <mgallman@xxxxxxxxxxxx>
To: Java Programming on and around the IBM i
<java400-l@xxxxxxxxxxxx>
Date: 06/01/2016 09:51 AM
Subject: RE: More than 2GB heap with 64 bit JVM?
Sent by: "JAVA400-L" <java400-l-bounces@xxxxxxxxxxxx>



If possible rather than increasing the heap you might want to change your
process to use the Streaming spreadsheet (SXSSF) functionality that POI
provides. This will allow you to build much bigger spreadsheets without
consuming so much memory.

https://poi.apache.org/spreadsheet/how-to.html#sxssf

If you still want to increase the max heap it would be done using the -Xmx
parameter (e.g. Java -Xmx3g Hello)...when I specify -Xmx4g on Java 1.6 I
get an error that the value is too large.

Mitch


-----Original Message-----
From: JAVA400-L [mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of Darren
Strong
Sent: Wednesday, June 01, 2016 8:27 AM
To: java400-l@xxxxxxxxxxxx
Subject: More than 2GB heap with 64 bit JVM?


I have a certain application running using the JNI (more specifically, RPG
calling Java Excel POI HSSF) to create a really large spreadsheet, and its
running out of memory/heap. We're running a 64bit JVM. If I can figure
out how to specify a larger maximum heap size, can I go beyond the current
2GB limit? Is there a way to alter the maximum heap size for a job? If
not by job, by default?

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