Performance / dual core?



  • hi people!

    I am working on a patch that processes (heavily) video from a live capture. my processor is a 2.4ghz one, and I cannot work in a 720 * 576 resolution, because my frame rate goes deeply down. so I am right now testing the patch in a 360 * 288 resolution, but of course, for screening matters, this is not perfect.
    So, I am going to build a desktop computer with a 3.4ghz processor. (desktop because its cheaper)
    now, the question is, since I am still not sure if it is going to work correctly under a 720 * 576 resolution and 25 fps, **would it be better to build a computer with 2 physical 3.40ghz processor? did anybody tried a motherboard supporting 2 processors?**
    how would this work.
    thanks!
    leo.-


  • hi,

    What kind of video capture card do you use ?
    This changes a lot how heavy it is.
    Can you describe your actual machine ?
    With 2.8gHz Core2Duo I used to capture 2 x 720x576 streams, with a very low impact on performances.
    I was using internal dedicated video capture cards ( like blackmagic intensity )
    Best
    Mehdi


  • I use a canon camera, hv40, connected via firewire.

    Processor Intel® Core™ i5-520M Processor (2.40 GHz, 3 MB L3 cache)
    Graphics NVIDIA NVS 5100M graphics with 1 GB dedicated DDR3 memory
    The Live capture is not the issue. the issue are all the processes that comes afterwards.


  • I think the live capture is the problem, since you capture firewire=DV that is very CPU hungry. Try different camera (just for a test) some USB cam for instance.



  • I will, but actually I remember reading in the past that live capture from a firewire device consumes very little or none CPU resources.

    And, usb does consum CPU resources.
    anybody else knows about this?
    anyway, and going back to my original question, I know that the main problem is the processes that I am applying later, since I have tried the patch without a live capture, but with a movie player, and the performances problems remain.
    so how would a computer with 2 physical 3.40ghz processors impact in the performance?
    Thanks!


  • Dear Camilozk,

    Regarding your question "so the topic of this thread mainly is, how would a computer with 2 physical 3.40ghz processors impact in the performance?"
    First, I am not an expert on this topic, and certainly I don't know if a second _physical_ processor would be any different than having more cores.
    The video capture task is handled by Windows operating system, but, of course, once the video data is actually captured, Isadora does the rest. Isadora is not multi-threaded at this time, not that this is going to make a significant difference if you're putting that video through lots of effects etc. So, to sum up 1) the actual act of capturing from the camera may be improved by more CPUs, etc. because the Windows subsystem may move those tasks to other processors, 2) the effects processing in Isadora (meaning actors like Desaturate or HSL Adjust, etc.) will not benefit because it is not multi-threaded.
    Hopefully that helps; I'm sorry that I can't give a better answer.
    Best Wishes,
    Mark


  • thank you mark


Log in to reply
 

Looks like your connection to TroikaTronix Community Forum was lost, please wait while we try to reconnect.