On Feb 3, 2012, at 1:25 AM, Mark Roos wrote: > So I ran some tests using a simple benchmark using the jdk8-b23 from the > Openjdk google code. > > Without tiered compile I get: ( times in nanoseconds ) > 52101000 > 53973000 > 20932000 > > with tiered on > 493788000 > 521448000 > 513287000 > 342930000 > 15048000 > > But if I invalidate all call sites before the benchmark with tiered I see: > > 449127000 > 288584000 > 80717000 > 36255000 > > and without tiered > 49210000 > 744625000 > 27179000 > 26377000 > 24514000 > > in all cases more runs after show no changes for 30 runs. > > So tiered starts very very very slow but ends better. Both seem to have a > hard time if call sites have their > targets reset. > > any thoughts on how I might get the best always? Especially for callsite > resets.
What exactly do you mean by "invalidate call sites before the benchmark"? Are you using MutableCallSites and call setTarget on them? > > And why would the startup be 10x slower for tiered? Good question. The run times are long enough (around 0.5s) that a C2 compile should happen in the first runs. But maybe I'm wrong. Igor, do you have an idea? -- Chris > > By the way the data for jdk7u4 is similar but its best times are slower. > > regards > mark_______________________________________________ > mlvm-dev mailing list > mlvm-dev@openjdk.java.net > http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
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