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‘JOL (Java Object Layout) is the tiny toolbox to analyze object layout schemes in JVMs. These tools are using Unsafe, JVMTI, and Serviceability Agent (SA) heavily to decoder the actual object layout, footprint, and references. This makes JOL much more accurate than other tools relying on heap dumps, specification assumptions, etc.’ Recommended by Nitsan Wakart, looks pretty useful for JVM devs
(tags: java jvm tools scala memory estimation ram object-layout debugging via:nitsan)
HdrHistogram: A better latency capture method
An excellent intro to HdrHistogram usage
(tags: hdrhistogram hdr histograms statistics latency measurement metrics percentiles quantiles gil-tene nitsan-wakart)