On-heap cache vs Off-heap cache w Javie
summary
Covers Java off-heap memory (memory outside the JVM heap), explaining pros/cons and how to use ByteBuffer (direct vs non-direct, endianness), Unsafe.allocateMemory, and memory-mapped files. Compares three caching approaches—Hazelcast (on-heap), ChronicleMap (off-heap), and Redis (C-based)—with performance measurements for write/read and GC pause behavior, and includes ChronicleMap code examples.
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