filterbytile.sh only using Xmx1876m on a large 7.4G instance

[avilella]

Hi, I discovered filterbytile.sh recently and I am trying it to analyse some of our data.

I wrote a DNAnexus app, and when run with default parameters, it runs with -Xmx1876m, even though the instance has 7.4G of memory. If on an instance half the memory size, the Xmx only takes about 300m of memory.

Should I specify the Xmx flag manually to something closer to the total mem amount available?