On 12 Feb 2016 07:10, Armin Rigo <arigo(a)tunes.org> wrote:
> Hi Edd,
> On Fri, Feb 12, 2016 at 12:18 PM, Edd Barrett <edd(a)theunixzoo.co.uk> wrote:
> > JITted VMs (currently PyPy, HotSpot, Graal, LuaJIT, HHVM, JRubyTruffle
> > and V8) using microbenchmarks. For each microbenchmark/VM pairing we
> > sequentially run a number of processes (currently 10), and within each
> > process we run 2000 iterations of the microbenchmark. We then plot the
> > results and make observations.
> PyPy typically needs more than 2000 iterations to be warmed up.
Same goes for the JVM. Off the top of my head it doesn't even start marking a method as hot until around 10,000 iterations (at which point it'll start to do the first stage of optimisations). If you're below that threshold you're dealing with pure interpreter performance.