[danuker]

My money is on garbage collection. In Rust it can happen from compile time: https://stackoverflow.com/a/32677591/235463

[PEJOE]

That doesn’t explain C++’s poor tail performance, unless it’s just poorly optimized like the top comment suggested

[gpapilion]

Yes it’s hard to tell without looking at the Java options. But especially since it’s a single cpu benchmark, it’s likely something blocked for a period of time.