javaserializationcompressionmapdboff-heap

MapDB, serializers and compression

I'm researching into off-heap cache and can't seem to find much information/benchmarks on memory consumption on-heap vs. off-heap (still in memory).

I'm planning to use MapDB. Documentation indicates that compression can be applied on serialized objects and/or entire data store.

Questions:

  1. Does serialized object off-heap have smaller memory footprint in comparison to the same object on-heap? If possible ratio/benchmark?
  2. What is overhead for SerializerCompressionWrapper (may be benchmark?)
  3. How efficient is the compression?

Thank you!!!

Solution

  • 1) yes, the off-heap consumes less data compared to heap

    2) there is no benchmark

    3) it is very fast LZF compression, it should do about 1GB/s on reasonable CPU