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Re: PATCH: improved performance timing

To: Michael Meissner <meissner at cygnus dot com>
Subject: Re: PATCH: improved performance timing
From: Andi Kleen <ak at suse dot de>
Date: 28 Apr 2000 10:54:39 +0200
Cc: gcc-patches at gcc dot gnu dot org
References: <14600.57534.90608.162141@coriander.indetermi.net> <20000427184033.A12491@cygnus.com> <20000427221259.60478@cse.cygnus.com>

Michael Meissner <meissner@cygnus.com> writes:
> 
> Somebody also might think about optionally using machine dependent timers and
> avoid all time system calls, while being more accurate.

Machine dependent timers without system support usually don't work
on SMP machines (at least reserving context switched performance registers
is usually hard, in most cases you only get a global per CPU cycle 
counter)


-Andi

References:
- PATCH: improved performance timing
  - From: Alex Samuel
- Re: PATCH: improved performance timing
  - From: Richard Henderson
- Re: PATCH: improved performance timing
  - From: Michael Meissner

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