[infinispan-dev] CHM or CHMv8?

Guys, Based on some recent micro benchmarks I've been doing, I've seen: MapStressTest configuration: capacity 100000, test running time 60 seconds Testing mixed read/write performance with capacity 100,000, keys 300,000, concurrency level 32, threads 12, read:write ratio 0:1 Container CHM Ops/s 21,165,771.67 Gets/s 0.00 Puts/s 21,165,771.67 HitRatio 100.00 Size 262,682 stdDev 77,540.73 Container CHMV8 Ops/s 33,513,807.09 Gets/s 0.00 Puts/s 33,513,807.09 HitRatio 100.00 Size 262,682 stdDev 77,540.73 So under high concurrency (12 threads, on my workstation with 12 hardware threads - so all threads are always working), we see that Infinispan's CHMv8 implementation is 50% faster than JDK6's CHM implementation when doing puts. We use a fair number of CHMs all over Infinispan's codebase. By default, these are all JDK-provided CHMs. But we have the option to switch to our CHMv8 implementation by passing in -Dinfinispan.unsafe.allow_jdk8_chm=true. The question is, should this be the default? Thoughts, opinions? - M -- Manik Surtani manik(a)jboss.org twitter.com/maniksurtani Platform Architect, JBoss Data Grid http://red.ht/data-grid