i created a ticket on trac http://ghc.haskell.org/trac/ghc/ticket/8279
On Thu, Sep 12, 2013 at 3:46 PM, Carter Schonwald < carter.schonw...@gmail.com> wrote: > Reid Barton was just noticing some alignment perf issues and talking > about it on #ghc / #haskell-llvm > > probably worth documenting it in a ticket! > > > > On Thu, Sep 12, 2013 at 3:28 PM, Nicolas Frisby > <nicolas.fri...@gmail.com>wrote: > >> On my laptop, a program showed a consistent slowdown with -fdicts-strict >> >> I didn't find any obvious causes in the Core differences, so I turned to >> Intel's Performance Counter Monitor for measurements. After trying a few >> counters, I eventuall saw that there are about an order of magnitude more >> misaligned memory loads with -fdicts-strict than without, so I think that >> may be a significant part of the slowdown. I'm not sure if these are code >> or data reads. >> >> Can anyone suggest how to validate this hypothesis about misaligned reads? >> >> A subsequent commit has changed the behavior I was seeing, so I'm not >> interested in alternatives means to determine if -fdicts-strict is somehow >> at fault — I'm just asking specifically about data/code memory alignment in >> GHC and how to diagnose/experiment with it. >> >> Thanks. >> >> >> _______________________________________________ >> ghc-devs mailing list >> ghc-devs@haskell.org >> http://www.haskell.org/mailman/listinfo/ghc-devs >> >> >
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