From: Stephen Leake <stephen_leake@acm.org>
Subject: Re: task-safe hash table?
Date: Wed, 07 Jun 2006 21:10:26 -0400
Date: 2006-06-07T21:10:26-04:00 [thread overview]
Message-ID: <uodx4jvul.fsf@acm.org> (raw)
In-Reply-To: FradnWbzpPdOix7ZnZ2dnUVZ_qmdnZ2d@comcast.com
tmoran@acm.org writes:
> with ada.calendar,
> ada.text_io;
> procedure timeprot is
>
> <snip>
This looks like a reasonable test. Here's my results with GNAT 5.04 on
Windows XP (I only kept the second run; the first loads cache):
gnatmake -O0
./timeprot.exe
a 0.025702000 mics
b 0.026539000 mics
c 0.029333000 mics
prot.a 4.420673000 mics
prot.b 0.504533000 mics
prot.c 0.423238000 mics
gnatmake -O2
./timeprot.exe
a 0.023188000 mics
b 0.022629000 mics
c 0.023187000 mics
prot.a 7.770820000 mics
prot.b 0.576610000 mics
prot.c 0.529676000 mics
Interesting that it is slower with -02!
AdaCore recommends against using -O3 because it includes "potentially
unsafe and disruptive optimizations". But here it is anyway:
gnatmake -O3
./timeprot.exe
a 0.014806000 mics
b 0.014527000 mics
c 0.004470000 mics
prot.a 7.431950000 mics
prot.b 0.619911000 mics
prot.c 0.529676000 mics
There is some variation from run to run. But this is pretty convincing
that a protected function call is 25 times slower than a plain
function call. I'll see what AdaCore has to say. And I'll try it on
Lynx, which is more real-time than Windows or Linux :).
--
-- Stephe
next prev parent reply other threads:[~2006-06-08 1:10 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-29 21:42 task-safe hash table? tmoran
2006-05-29 22:56 ` John
2006-05-30 0:18 ` tmoran
2006-05-30 3:50 ` John
2006-05-30 4:35 ` tmoran
2006-05-30 9:50 ` Georg Bauhaus
2006-06-01 6:32 ` Simon Wright
2006-06-01 19:30 ` tmoran
2006-06-01 20:03 ` Ludovic Brenta
2006-06-01 20:07 ` Dmitry A. Kazakov
2006-06-02 4:31 ` Jeffrey R. Carter
2006-06-02 10:36 ` Stephen Leake
2006-06-03 6:50 ` tmoran
2006-06-03 20:40 ` tmoran
2006-06-02 10:35 ` Stephen Leake
2006-06-02 20:19 ` tmoran
2006-06-03 21:10 ` M E Leypold
2006-06-04 0:23 ` tmoran
2006-06-04 12:55 ` Stephen Leake
2006-06-04 17:22 ` tmoran
2006-06-08 1:10 ` Stephen Leake [this message]
2006-06-11 13:29 ` Georg Bauhaus
2006-06-04 17:48 ` Simon Wright
2006-06-05 0:23 ` tmoran
2006-06-05 21:57 ` Steve Whalen
2006-06-06 11:10 ` Ole-Hjalmar Kristensen
2006-05-30 15:00 ` Matthew Heaney
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