-Xmx ignored by GPT?

Optical Toolbox
#1

Hi,

I am trying to deal with an S2 Idepix processing graph that attempts to use too much memory when processing a larger area (still a subset of the overall tile) and is killed.

My understanding is that I should set the maximum memory using -Xmx in the gpt.vmoptions. When I set -Xmx to 12G on my 32G linux machine the GPT graph uses up all the available memory (not just 12G) up to 32G and is then killed.

I can remedy the issue by using a machine with more RAM but I am confused about why the -Xmx parameter is not limiting the memory usage and in general seems to have little effect?

Does anyone have any ideas? Am I using the gpt.vmoptions incorrectly?

Thanks

James

#2

Iā€™d suggest to split your processing into smaller chunks. It can be more time-consuming but might help to stay within your memory limits.

#3

Do you use NetCDF format in your processing.
SNAP uses the native NetCDF library, and this uses additional memory outside of the Java VM. Not controllable by the Xmx option.

EOMasters_icon_60 Marco from EOMasters - Mastering Earth Observation

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