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Thread: French Developer Reports Significant Speed Bump Under Snow Leopard

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    MMi Staff Writer Paul Daniel Ash's Avatar
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    Default French Developer Reports Significant Speed Bump Under Snow Leopard


    Christophe Ducommun, the developer of video software MovieGate has found, as reported by the French website HardMac, that he was able to go from 104 frames per second encoding under Leopard to 150 frames per second under Snow Leopard making use of Grand Central Dispatch and OpenCL, two new technologies used in the current release.

    Grand Central Dispatch is a way to more efficiently make use of multiple-core processors. Ordinarily, a programmer would have to write explicit code for dual-core and quad-core CPUs, but GCD handles this for the developer. OpenCL allows programs to take advantage of the video card's graphics processing unit (GPU), normally used for rendering, to share the load with the CPU.

    In addition, Ducommun found that MPEG-2 encoding went from 100% to 130% CPU utilization on a quad-core Mac Pro - showing GCD taking advantage of his multi-core CPU - and decoding dropped CPU utilization from 165% to 70%, which indicated that the work had been offloaded to the GPU.

    This is one of the first examples of a developer realizing significant performance improvements merely by turning on support for an existing feature in Snow Leopard. We should see more such news in the weeks and months to come.
    Last edited by Paul Daniel Ash; 09-18-2009 at 12:33 PM. Reason: dropped a comma

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    Livin the iPhone Life tudtran's Avatar
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    Really???? I have noticed my divx and vlc players been skipping a lot lately in full screen mode.

  3. #3
    I've noticed the speed bump big time... except with emptying the trash. The trash takes FOREVER to empty!!! WTF?

  4. #4
    @tudtran: The app needs to be optimized to use the new APIs before you see a difference. Give the developers some time and wait for a few software updates and you'll eventually see a difference

  5. #5
    LOL! I thought the title of this topic meant a bad thing as in "speed bump" in the road would slow you down!

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    Super Sweet Moderator thetoothfairy's Avatar
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    guess i should update

    lol TheOrioles33
    Last edited by robbpell; 09-18-2009 at 03:03 PM.
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    Quote Originally Posted by thetoothfairy View Post
    ^ R U 4 Real?
    I think I am!

  9. #9
    Quote Originally Posted by TheOrioles33 View Post
    LOL! I thought the title of this topic meant a bad thing as in "speed bump" in the road would slow you down!
    I thought the same thing. I re-read the article twice to try to figure out what I was missing.. "speed bump" should say speed jump.. or something. lol.

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    What's Jailbreak? enjoi4586's Avatar
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    Quote Originally Posted by dirtygermankid View Post
    I thought the same thing. I re-read the article twice to try to figure out what I was missing.. "speed bump" should say speed jump.. or something. lol.
    Man, I'm glad I'm not the only one that thought this.

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    Livin the iPhone Life redcard's Avatar
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    I wouldn't trust a Frenchman to sit the correct way round on a toilet bowl
    To live, you have to lie

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    iPhoneaholic plcrules's Avatar
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    I wouldn't trust a Frenchman to sit the correct way round on a toilet bowl
    thats pretty raciest
    but alot of programmers have noticed this speed jump lol

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    Livin the iPhone Life adp's Avatar
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    Quote Originally Posted by redcard View Post
    I wouldn't trust a Frenchman to sit the correct way round on a toilet bowl
    LMAO!!

    And I agree on the speed bump title. It's misleading.
    If I helped you out, please use the Thanks button ------------------------->

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    Green Apple
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    Quote Originally Posted by redcard View Post
    I wouldn't trust a Frenchman to sit the correct way round on a toilet bowl
    Quote Originally Posted by plcrules View Post
    thats pretty raciest
    but alot of programmers have noticed this speed jump lol


    Nothing racist about it. You've obviously never used a [ame=http://en.wikipedia.org/wiki/Bidet]bidet[/ame] before...
    Last edited by davshirley; 09-18-2009 at 06:27 PM.

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    iPhoneaholic plcrules's Avatar
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    Nothing racist about it. You've obviously never used a Bidet before...
    lol i have 1 i didnt no it was french

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    iPhone? More like MyPhone badass1469's Avatar
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    Quote Originally Posted by TheOrioles33 View Post
    LOL! I thought the title of this topic meant a bad thing as in "speed bump" in the road would slow you down!
    lol me to, but i guess it's supposed to mean the speed got bumped up.
    damn drug dealers, and there jailbroken iPhones... ____ Hit the thanks if you think i suck

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    Retired Moderator StealthBravo's Avatar
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    I misread it too

  18. #18
    Default Miss leading title :)
    Idk bout u guys but when I think about speed bumps I think about cars and slowing down not an increase in speed. I've been working in fcp but it didn't seem to help any there
    "Search" is your friend

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    My iPhone is a Part of Me rwin84's Avatar
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    does anyone remember excite bike??? speed jump, speed hump, speed bump all this talk reminds me of an 8 bit video game
    This is getting a lil' ridiculous...

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    iPhoneaholic
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    Normally (I suppose) one would say "A bump in performance". Anyway, as mentioned, you will not see substantial performance increases until the applications are rewritten to take advantage of OpenCL. For my own stuff, I'm seeing a substantial increase in performance using OpenCL on both Snow Leopard and Windows.

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