Reading the doc on BigArray (https://fastutil.di.unimi.it/docs/it/unimi/dsi/fastutil/BigArrays.html), I think BigList, which is backed by BigArray still uses on heap memory, i.e., memory managed by JVM. Do I understand correctly? I greped on the source code and didn't see keyword like sun.misc to suggest off-heap memory usage. But, reading overview page on big hash set, I notice "big hash sets provide support for sets whose size is only limited by the amount of core memory." Does core memory mean the memory used by JVM or physical memory?
vigna
commented
1 year ago
Reading the doc on BigArray (https://fastutil.di.unimi.it/docs/it/unimi/dsi/fastutil/BigArrays.html), I think BigList, which is backed by BigArray still uses on heap memory, i.e., memory managed by JVM. Do I understand correctly? I greped on the source code and didn't see keyword like
sun.miscto suggest off-heap memory usage. But, reading overview page on big hash set, I notice "big hash sets provide support for sets whose size is only limited by the amount of core memory." Does core memory mean the memory used by JVM or physical memory?Thank you!