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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