[thredds] Large aggregated datasets, WMS memory issue

Hi all,

I'm in process of serving out some large aggregated datasets (5 - 8GB) with 
Thredds WMS.  I consistently experience "OutOfMemoryError: Java heap space" 
error when making WMS requests. On my test machine, I've allocated -Xmx1536m to 
Tomcat and experimentally Thredds is able to serve about 1GB aggregated 

By digging through the Dataset Aggregation and Memory related topics on the 
list, I've found out that the general suggestions are to allocate more memory 
to Tomcat such as: -Xmx4g

One post mentioned that "Thredds does everything in memory".

Can somebody please advise how much memory I should allocate to Tomcat for the 
8GB dataset? I'm afraid I have to secure more than 8GB memory.
And what is the best practice to serve out the large datasets on Thredds in 

Regards and thanks,

Xiangtan Lin

Technical Services Officer | CSIRO IM&T

xiangtan.lin@xxxxxxxx<mailto:xiangtan.lin@xxxxxxxx>| www.csiro.au
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