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Run this on your Intel Mac please |
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ksattic (20:09 2/12/2006)
moss (20:19 3/12/2006)
ksattic (02:00 5/12/2006)
VincentVega (16:35 16/12/2006)
ksattic (18:38 17/12/2006)
monkeyson2 (02:35 18/12/2006)
andypoole (20:33 3/12/2006)
ksattic (17:44 4/12/2006)
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Simon Wilson |
Message #95101, posted by ksattic at 20:09, 2/12/2006 |
 Finally, an avatar!
Posts: 1291
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http://simonrules/osx/sqrt.zip
It does 100 million inverse square roots using the sqrt function (slowpath) and the Quake 3 fast InvSqrt function (fastpath).
The Iyonix is 260 times slower than my 2.16GHz MacBook Pro! It's all floating point, though.
Times for the Mac:
slowpath: 4520ms
fastpath: 1050ms
Compiled with gcc with -O3. XCode is slower!
I'm worried because my 1.2GHz Athlon Linux server is faster by 25% on the fastpath. |
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John Hoare |
Message #95194, posted by moss at 20:19, 3/12/2006, in reply to message #95101 |
Posts: 9348
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a) Surely you mean http://www.simonrules.com/osx/sqrt.zip 
b) On my 1.66Mhz Intel Core Duo Mac Mini:
slowpath: 5830 ms
fastpath: 1360 ms |
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Andrew Poole |
Message #95195, posted by andypoole at 20:33, 3/12/2006, in reply to message #95101 |
Posts: 5558
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Last login: Sun Dec 3 20:30:47 on ttyp1
Welcome to Darwin!
Minnie:~ andrew$ cd Desktop
Minnie:~/Desktop andrew$ ./sqrt
slowpath: 5830 ms
fastpath: 1340 ms
Minnie:~/Desktop andrew$ (1.66Ghz Intel Core Duo Mac Mini, 512MB RAM, OS X 10.4.5 (Freshly installed this afternoon, hence not up to day yet... that's tomorrow's job.)) |
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Simon Wilson |
Message #95262, posted by ksattic at 17:44, 4/12/2006, in reply to message #95195 |
Finally, an avatar!
Posts: 1291
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Thanks guys. I recompiled with XCode to vectorise code where possible, and I managed to beat my Linux machine by about 50%. I'll post the figures later. The app should only use one core of the CPU as it only has one thread, so the Mac doesn't get to leverage its dual core advantage. |
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Simon Wilson |
Message #95292, posted by ksattic at 02:00, 5/12/2006, in reply to message #95194 |
Finally, an avatar!
Posts: 1291
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a) Surely you mean http://www.simonrules.com/osx/sqrt.zip Oops! Thanks for fixing that!
Here's XCode with all optimisations on:
slowpath: 4500 ms
fastpath: 550 ms |
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VV |
Message #95897, posted by VincentVega at 16:35, 16/12/2006, in reply to message #95292 |
Member
Posts: 7
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On a 3.0GHz Mac Pro (2GB RAM):
slowpath: 3300ms
fastpath: 830ms
I wonder why fastpath is slower than your 550ms. Perhaps the higher latency of the FB-DIMMs in the Mac Pro are slowing it down a bit. |
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Simon Wilson |
Message #95928, posted by ksattic at 18:38, 17/12/2006, in reply to message #95897 |
Finally, an avatar!
Posts: 1291
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It's not - the version you downloaded was the gcc version, so my fastpath was 1050ms.  |
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Phil Mellor |
Message #95943, posted by monkeyson2 at 02:35, 18/12/2006, in reply to message #95897 |
 Please don't let them make me be a monkey butler
Posts: 12380
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On a 3.0GHz Mac Pro (2GB RAM):  |
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