[Pkg-haskell-maintainers] Bug#788324: Bug#788324: Unsupported on arches besides i386 and amd64

[Joachim Breitner]

Hi,

Am Mittwoch, den 17.06.2015, 15:00 +0100 schrieb Edmund Grimley Evans:
> > remove it there.
> 
> Remove the assembly code, or remove the package?
> 
> It wasn't clear to me whether the bit that reads an Intel performance
> counter is central to the whole point of the package, or just a
> feature that some users might find useful. If you modified that
> function to return 0 on non-Intel architectures, would the package
> then be useless on those other architectures?

I haven’t checked yet.

> Also, I'm curious to know how useful this feature is on a multi-core
> Intel system. Does the package arrange for processes to remain on a
> single core?
> 
> https://en.wikipedia.org/wiki/Time_Stamp_Counter says: "With the
> advent of multi-core/hyper-threaded CPUs, systems with multiple CPUs,
> and hibernating operating systems, the TSC cannot be relied on to
> provide accurate results — unless great care is taken to correct the
> possible flaws: rate of tick and whether all cores (processors) have
> identical values in their time-keeping registers. There is no promise
> that the timestamp counters of multiple CPUs on a single motherboard
> will be synchronized."
> 

Good points. They should probably be raised at
https://github.com/bos/criterion/issues/80
though.

-- 
Joachim "nomeata" Breitner
Debian Developer
  nomeata at debian.org | ICQ# 74513189 | GPG-Keyid: F0FBF51F
  JID: nomeata at joachim-breitner.de | http://people.debian.org/~nomeata
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