Choosing your JVM and properly configuring it
This one has become easy by now:
With the advent of GraalVM
19.3.0 for any need there is a Java runtime compatible with
Java 11 that you really should use. Any distro / OS will have a
ready-made install available that does not require further
tweaking. Now we also have the G1 garbage collector standard
everywhere.
Be sure include the following optimizations in wrapper.config:
wrapper.java.additional.**=-XX:+UseG1GC # default, not really
necessary
wrapper.java.additional.**=-XX:G1ConcRefinementThreads=1 #
for 8+ cores, i2p does not need more
wrapper.java.additional.**=-XX:ConcGCThreads=1 # for 8+
cores, i2p does not need more
32-bit VMs are more memory efficient and best choice for i2p, but
most of you guys will run 64 bit, so enable the Graal JIT compiler
using:
wrapper.java.additional.**=-XX:+UnlockExperimentalVMOptions
wrapper.java.additional.**=-XX:+UseJVMCICompiler # noop if
using Graal
In terms of speed there should be no big difference between 32 bit
with the default C2 JIT compiler and 64 bit using Graal JIT.
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