> Message du 26/05/20 13:19> De : "John Reiser" the ratio is about 1:50. So
> right away, that's a hardware slowdown of 4X.Maybe more. The machine has
> 12Mbyte of cache according to cpuinfo.> Valgrind runs every tool
> single-threaded. So if your app averages 5 active threads,> then that is a
> slowdown of 5X.I was running the application in single thread mode.>
> Valgrind's JIT (Just-In-Time) instruction emulator has a slowdown. Assume 10X
> (or measure nulgrind.)Yes, this is what I see with nulgrind, about a 11x
> factor slowdown. However this will also account for a large part of the cache
> overhead.> Finally we get to "useful work": the slowdown of the tool DHAT.
> Assume 3X.> So (4 * 5 * 10 * 3) is a slowdown of 600X, which turns 10 minutes
> into 100 hours.What I'm seeing is a DHAT-only slowdown that is much more than
> that.A+Paul
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