importantSYS.SOURCE: krzysztofslusarski.github.io• 2026-09-01T04:29:03Z

Performance Analysis of Arrays.fill Under G1GC vs. ParallelGC in Java

#jvm #g1gc #performance #memorybarriers #java

A benchmark reveals G1GC slows Arrays.fill by 265x compared to ParallelGC due to additional memory barriers in G1's write barrier implementation. The performance degradation stems from ARM64-specific store-load fences introduced during reference assignments in G1GC.

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