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PCI-E bandwidth test (cuda)

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TrekCZ
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2013/07/07 01:49:45 (permalink)
Continuation of my thread
http://forums.evga.com...x?m=253215&mpage=1
 
program is available to download at
https://docs.google.com/f...vq9wuvZQ2pWdVV3MkdBdTg
 
Usage - application must be started from command line - cmd.exe:
concBandwidthTest.exe 0
there can be more numbers 0 is first card, 1 is second card ... more numbers mean test concurrently
e.g. concBandwidthTest.exe 0 1 or concBandwidthTest.exe 1 or concBandwidthTest.exe 0 2 or concBandwidthTest.exe 0 1 2 ...

 
My result (GTX 780, 4770K, Z87)
concBandwidthTest.exe 0
Device 0 took 537.110535 ms
Average HtoD bandwidth in MB/s: 11915.610637
Device 0 took 528.212524 ms
Average DtoH bandwidth in MB/s: 12116.335195
Device 0 took 1063.176270 ms
Average bidirectional bandwidth in MB/s: 12039.395881
 
which is approx. twice as PCI-E 2.0 = very nice throughput.
 
PS:
It would be nice to see whether GTX Titan has concurrent bidirectional transfer, i.e. bidirectional bandwidth should be sum of htod and dtoh. GTX 780 does not have concurrent bidirectional PCIE transfer - result is that Titan does not have it.
post edited by TrekCZ - 2013/11/25 12:34:04
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    rjohnson11
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 03:10:41 (permalink)
    What was your PC setup specs for this test?

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    TrekCZ
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 03:22:14 (permalink)
    My spec is GTX 780, 4770K, Z87 mobo.
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    rjohnson11
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 03:45:39 (permalink)
    Oh by the way I think this article will answer your questions about bidirectional bandwidth since the GTX Titan supports PCI Express 3.0:
     
    http://www.tomshardware.c....0-pci-sig,2695-3.html

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    TrekCZ
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 04:14:38 (permalink)
    Thanks for info, but what I want is people to run test and post results to see what and how works. They can also verify that their setup is working correctly with this.
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    rjohnson11
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 04:28:30 (permalink)
    Just to let you know this program will not run in the Windows 8.1 preview version. Even in Windows 7 compatibility mode.

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    TrekCZ
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 04:38:17 (permalink)
    What are symptoms? This program is to be run from command line. Open cmd.exe go to the directory where exe is located and issue command
     
    concBandwidthTest.exe 0
     
    this should work, because it works on Windows 8 (Microsoft writes Windows 8.1-a free update to Windows 8)
    post edited by TrekCZ - 2013/07/07 04:46:20
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    pharma57
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 04:57:33 (permalink)
    The program is dealing only with average and not Total bidirectional bandwidth, correct?
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    TrekCZ
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 05:02:51 (permalink)
    I do not understand your question, program shows bandwidth to gpu from gpu and concurrent bidirectional bandwith.
    Those values are averages of some measurements - but there is average total bandwidth (all numbers are total).
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    pharma57
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 05:50:13 (permalink)
    I guess it's easy to use your example above:
    Total Bidirectional Bandwidth --> 11915.610637 + 12116.335195 = 24031.945832 (approx.)

    ** Average Bidirectional Bandwidth --.  24031.945832 / 2 = 12015.972916  (approx.)

    ** This is the value returned by the program for "Average bidirectional bandwidth in MB/s" .. an average bandwidth value. 
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    rjohnson11
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 05:55:26 (permalink)
    Finally got it to work. Here are the results:
     


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    TrekCZ
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 05:59:48 (permalink)
    Ok, your calculation is correct, however total bidirectional bandwidth is not fully relevant because it can be achieved only in configuration with devices that would support concurrent bidirectional bandwidth (or with  multiple PCIE devices). And for this reason there is third measurement
     
    Average bidirectional bandwidth in MB/s: 12039.395881
     
    which is real measurement, not calculation from two values, in my case it is approx. average you calculated, but measured number is better, because it is real measurement. So in my config total pcie bandwidth is maximally only 12039 MB/s, because I do not have devices that would allow to utilize full total PCI-E 3.0 bandwidth (I have only one PCI-E GPU).
     
    For total it would be possible to create test variant which would utilize multiple gpu cards simultaneously send data to one card and read data from second card, but currently I have only one card so I cannot prepare this. This test can now utilitize multiple cards but it writes data to all cards and read data from all cards so one can see how PCI-E is saturated in multi GPU.
    post edited by TrekCZ - 2013/07/07 06:15:18
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    TrekCZ
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 06:02:07 (permalink)
    rjohnson11

    Finally got it to work. Here are the results:




    Yes these small values are there because you have PCIE 2.0 cpu/chipset. May I recommend you to upgrade to Z87, there is a lot of EVGA offerings you can choose from :-)
    post edited by TrekCZ - 2013/07/07 06:10:19
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    pharma57
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 06:18:58 (permalink)
    Lol... you really don't need a Z87 motherboard, X79 is just fine especially for enthusiasts.  On the side you should try  concBandwidthTest.exe 1 (use "1" instead of "0").  You might also see if you have latest MB bios updates, using NVidia pcie patch, etc...
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    bolts4brekfast
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 06:20:46 (permalink)
    Even though I don't fully understand the purpose of this test.. lol
    Here are my results:
     

     
    My specs are in signature.
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    TrekCZ
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 06:24:09 (permalink)
    pharma57
    On the side you should try  concBandwidthTest.exe 1 (use "1" instead of "0").

     
    Number there is which GPU is going to be used, if you have only one card and if you use concBandwidthTest.exe 1
    it will return
     
    Could not get device 1, aborting
     
    If you have multiple cards you can also use, e.g. for 2 cards
     
    concBandwidthTest.exe 0 1
     
    to see how pci-e is saturated, more cards used for test, higher the bandwidth shoud be.
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    TrekCZ
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 06:25:45 (permalink)
    bolts4brekfast
    Even though I don't fully understand the purpose of this test.. lol
    Here are my results:



    My specs are in signature.

     
    It shows that you have good motherboard that satuates fully PCI-E bus - is routing traffic to both cards in full speed. Nice numbers there. With such a motherboard you probably do not need to use sli bridge, because you are not bottlenecked by PCI-E.
    post edited by TrekCZ - 2013/07/07 06:29:59
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    pharma57
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    Re:PCI-E bandwidth test (cuda) 2013/07/07 06:31:16 (permalink)
    Here are my numbers for GTX 780x2, 3960x, x79):
     
    Device 0 took 611.787964 ms
    Device 1 took 608.589417 ms
    Average HtoD bandwidth in MB/s: 20977.261845
    Device 0 took 536.771667 ms
    Device 1 took 538.156433 ms
    Average DtoH bandwidth in MB/s: 23815.585871
    Device 0 took 1139.515503 ms
    Device 1 took 1136.518799 ms
    Average bidirectional bandwidth in MB/s: 22495.306295
     
     
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    linuxrouter
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    Re:PCI-E bandwidth test (cuda) 2013/07/09 14:26:15 (permalink)
    I do not have a Titan or GTX 780, but here are my results with an older version of your program:
     
    (GTX 680, ASUS RIVE, Intel 3930K)
     
    # ./concBandwidthTest 0
    Device 0 took 560.857422 ms
    Average HtoD bandwidth in MB/s: 11411.099609
    Device 0 took 529.496643 ms
    Average DtoH bandwidth in MB/s: 12086.951172
     
    Some time back, I ran bandwidth tests with both NVIDIA and AMD cards on different motherboards using bandwidth testing applications that are part of the NVIDIA and AMD SDKs.
     
    https://docs.google.com/spreadsheet/ccc?key=0AnfM8POXHOrVdFd6UHBuYmdmOGcwaHpqMzdyd0pxQXc#gid=0

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    boylerya
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    Re:PCI-E bandwidth test (cuda) 2013/07/09 20:14:28 (permalink)
    Still waiting to see significant benches where the bandwidth is tested for both PCI-E 2.0 and 3.0 in games or any other program like Solidworks that will saturate the bandwidth well.  Only benches ive seen showed a 1 to 3 fps difference in high demanding games, but I dont think that was testing SLI which is prob where it will make a real difference.  
    post edited by boylerya - 2013/07/09 20:18:58

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    vdChild
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    Re:PCI-E bandwidth test (cuda) 2013/07/09 22:02:01 (permalink)
    boylerya

    Still waiting to see significant benches where the bandwidth is tested for both PCI-E 2.0 and 3.0 in games or any other program like Solidworks that will saturate the bandwidth well.  Only benches ive seen showed a 1 to 3 fps difference in high demanding games, but I dont think that was testing SLI which is prob where it will make a real difference.  

    afaik they would have to be running a surround setup to come close to saturating the bw to show any real world fps improvement

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    eduncan911
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    Re:PCI-E bandwidth test (cuda) 2013/11/21 20:52:48 (permalink)
    This was linked to recently so reviving an old thread...
     
    1x Titan, Asus RIVE + 4930k, natively enables PCIe 3.0 during Windows 8.1 install.
     
     
     
    Results:
     
    Device 0 took 553.229187 ms
    Average HtoD bandwidth in MB/s: 11568.442429
    Device 0 took 510.658203 ms
    Average DtoH bandwidth in MB/s: 12532.844789
    Device 0 took 1062.093262 ms
    Average bidirectional bandwidth in MB/s: 12051.672354
     
    Enabling double precision actually lowered it by about 5%.
     
    I don't see how someone got 24,000? 

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    linuxrouter
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    Re:PCI-E bandwidth test (cuda) 2013/11/21 22:24:24 (permalink)
    Your bandwidth numbers look good overall and about what I see with my 3930K and 4930K processors and NVIDIA Kepler GPUs. Depending on which result you were looking at, the 24K value could be the sum of bandwidth for multiple cards or the sum of the H->D and D->H bandwidth values.

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    error-id10t
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    Re:PCI-E bandwidth test (cuda) 2013/11/24 18:57:47 (permalink)
    Guys, I don't understand this and what it's meant to show? I do however see that my 670 SLI is way lower than what others report. Also, why is my 2nd card faster when they're clocked the same (exactly).
     
    Card1:
    Device 0 took 1060.888428 ms
    Average HtoD bandwidth in MB/s: 6032.679623
    Device 0 took 1052.051147 ms
    Average DtoH bandwidth in MB/s: 6083.354422
    Device 0 took 2110.483643 ms
    Average bidirectional bandwidth in MB/s: 6064.960534
     
    Card2:
    Device 1 took 1032.901611 ms
    Average HtoD bandwidth in MB/s: 6196.137105
    Device 1 took 1015.067749 ms
    Average DtoH bandwidth in MB/s: 6304.997874
    Device 1 took 2041.495728 ms
    Average bidirectional bandwidth in MB/s: 6269.912705
     
    Combined:
    Device 0 took 1069.815063 ms
    Device 1 took 1043.507568 ms
    Average HtoD bandwidth in MB/s: 12115.503462
    Device 0 took 1280.325562 ms
    Device 1 took 1013.463562 ms
    Average DtoH bandwidth in MB/s: 11313.706502
    Device 0 took 2204.133545 ms
    Device 1 took 2045.389648 ms
    Average bidirectional bandwidth in MB/s: 12065.246957

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    Spongebob28
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    Re:PCI-E bandwidth test (cuda) 2013/11/24 19:26:52 (permalink)
    Asus Sabertooth Z77, 3770K, 780 GTX Classified
     
    Device 0 took 520.555969 ms
    Average HtoD bandwidth in MB/s: 12294.547327
    Device 0 took 514.771118 ms
    Average DtoH bandwidth in MB/s: 12432.709945
    Device 0 took 1028.986084 ms
    Average bidirectional bandwidth in MB/s: 12475.802742



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    eduncan911
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    Re:PCI-E bandwidth test (cuda) 2013/11/25 08:46:06 (permalink)
    linuxrouter
    Your bandwidth numbers look good overall and about what I see with my 3930K and 4930K processors and NVIDIA Kepler GPUs. Depending on which result you were looking at, the 24K value could be the sum of bandwidth for multiple cards or the sum of the H->D and D->H bandwidth values.


    I'm still fabricating and building my rig so i can't stick the 2nd one in yet to verify.
     
    I don't know if it's multiple cards or not.

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    eduncan911
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    Re:PCI-E bandwidth test (cuda) 2013/11/25 08:47:22 (permalink)
    error-id10t
    Guys, I don't understand this and what it's meant to show? I do however see that my 670 SLI is way lower than what others report. Also, why is my 2nd card faster when they're clocked the same (exactly).
     
    Card1:
    Device 0 took 1060.888428 ms
    Average HtoD bandwidth in MB/s: 6032.679623
    Device 0 took 1052.051147 ms
    Average DtoH bandwidth in MB/s: 6083.354422
    Device 0 took 2110.483643 ms
    Average bidirectional bandwidth in MB/s: 6064.960534
     
    Card2:
    Device 1 took 1032.901611 ms
    Average HtoD bandwidth in MB/s: 6196.137105
    Device 1 took 1015.067749 ms
    Average DtoH bandwidth in MB/s: 6304.997874
    Device 1 took 2041.495728 ms
    Average bidirectional bandwidth in MB/s: 6269.912705
     
    Combined:
    Device 0 took 1069.815063 ms
    Device 1 took 1043.507568 ms
    Average HtoD bandwidth in MB/s: 12115.503462
    Device 0 took 1280.325562 ms
    Device 1 took 1013.463562 ms
    Average DtoH bandwidth in MB/s: 11313.706502
    Device 0 took 2204.133545 ms
    Device 1 took 2045.389648 ms
    Average bidirectional bandwidth in MB/s: 12065.246957


    These look like PCIe 2.0 numbers.

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    doogkie
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    Re:PCI-E bandwidth test (cuda) 2013/11/30 13:11:24 (permalink)
    Was messing around in my bios and noticed it saying my top titan was running at pci-e 3.0  x4, So i found this thread and I ran the test and I am getting some horrible numbers.
     
    The bottom card is running 8x, but its getting bad numbers too I think.
     
    My mobo is a MSI Mpower Max, any idea?
     
    Getting an average of 6059 for device  0  and  3035 for device 1
     
     
     
     
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    eduncan911
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    Re:PCI-E bandwidth test (cuda) 2013/11/30 21:57:10 (permalink)
    doogkie
    Was messing around in my bios and noticed it saying my top titan was running at pci-e 3.0  x4, So i found this thread and I ran the test and I am getting some horrible numbers.
     
    The bottom card is running 8x, but its getting bad numbers too I think.
     
    My mobo is a MSI Mpower Max, any idea?
     
    Getting an average of 6059 for device  0  and  3035 for device 1



     
    If they are inserted into X16 slots, that are full 16 lanes per your mobo specs, then maybe there is some dust or something in the slot preventing a completely connection of all 16 lanes.  Maybe remove the cards, blow out the slots, clean the card's connector, and put them back in?
     

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    eduncan911
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    Re:PCI-E bandwidth test (cuda) 2013/11/30 21:58:29 (permalink)
    linuxrouter
    Your bandwidth numbers look good overall and about what I see with my 3930K and 4930K processors and NVIDIA Kepler GPUs. Depending on which result you were looking at, the 24K value could be the sum of bandwidth for multiple cards or the sum of the H->D and D->H bandwidth values.


    Ok, I was able to stick both Titans in a test rig with PCIe 3.0.  Yep, the "24k" numbers are with two cards in SLI in PCIe 3.0.  A single card reports 12k on PCIe 3.0.
     
    The Nvidia Force Enable PCIe 3.0 X79 hack doesn't make a difference on the Asus RIVE as the Asus RIVE auto-enables PCIe 3.0 on a fresh default Windows 8.1 with the latest Nvidia drivers and an PCIe 3.0 GPU.

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