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scripts: update default heap and mempry sizes
Motivation: By default dcache provides very conservative heap and direct memory sizes, namely 512m. Many sites have adjusted the heap size, but usually keep the direct memory size as-is. The recent nfs changes require the direct memory to at least 3% of the heap size. s direct memory shared by xroot mover pools have hard times to serve the data and fail with OOME. Modification: Bumo default heap and direct memory sizes to 2gb. Result: No OOME during pool operation. Acked-by: Albert Rossi Target: master, 9.1 Require-book: no Require-notes: yes (cherry picked from commit ff85783) Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
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