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How to use the GPU validation test. Tested with NVIDIA cards.

Pre-requisites:

  • NVIDIA drivers installed (you can check with 'nvidia-smi' command to see if it properly outputs the NVIDIA hardware devices)

Instructions

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How to use the GPU validation test. Tested with NVIDIA cards.

Pre-requisites:

  • NVIDIA drivers installed (you can check with 'nvidia-smi' command to see if it properly outputs the NVIDIA hardware devices)

Instructions

  1. Download/unpack files into root directoy

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    wget https://exxact-support.s3.us-west-1.amazonaws.com/Test+Folder/Stand_Alone_Validation_v4.2.1.tar.gz --no-check-certificate
tar -xvzf Stand_Alone_Validation_v3v4.2.1.tar.gz
    Use these commands id you have a 30XX series GPU:


  2. Change directory to unpacked folder
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    wget https://exxact-disk-images.s3-us-west-1.amazonaws.com/AMBER+Stand+Alone+Test/Stand_Alone_Validation_v4.0.tar.gz --no-check-certificate
tar -xvzf Stand_Alone_Validation_v4.0.tar.gz
    Change directory to unpacked folder
    cd Stand_Alone_Validation


     Info
    Duration of tests varies depending on GPU's being used. If you are using a smaller GPU specifically for display, you need to remove that GPU and use this system using terminal-view only or SSH to run the test.

  3. Run test in the background by using (run as root)
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    cd Stand_Alone_Validation
    Set amount of GPU's/test cycles desired by editing '
    nohup ./run_test.x
    ' file
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    nano run_test.x

#How many GPUs in node
gpu_count=4

#How many tests to run of each type
#Large test requires 5GB memory
#Xlarge test requires 11GB memory
small_test_count=20
large_test_count=10
xlarge_test_count=5
    Note: Duration of tests varies depending on GPU's being used. If you are using a smaller GPU specifically for display, you need to remove that GPU and use this system using terminal-view only or SSH to run the test.
  4. Save changes using 'ctrl+x' and answering 'y' to the prompt; I typically like to set 5/5/2 tests. The default amount of cycles are typically meant for overnight/long duration testing
  5. Run test in the background by using (run as root)
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    nohup ./run_test.x &
    Monitor GPU temps by opening another terminal and using 'nvidia-smi -l'; once you no longer see the 'standalone-test.bin' process being printed from 'nvidia-smi', you can check the logs to see if your set amount of cycles completed.
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    exx@ubuntu:~/Stand_Alone_Validation$ nvidia-smi -l
Tue Jan 15 17:35:14 2019
+ &

  6. Monitor GPU temps by opening another terminal and using 'nvidia-smi -l'; once you no longer see the 'standalone-test.bin' process being printed from 'nvidia-smi', you can check the logs to see if your set amount of cycles completed.
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    exx@ubuntu:~/Stand_Alone_Validation$ nvidia-smi -l
Tue Jan 15 17:35:14 2019
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 410.78       Driver Version: 410.78       CUDA Version: 10.0     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence--------------------------------------------------------------+
| NVIDIA-SMI 410.78       Driver Version: 410.78M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|        CUDA Version: 10.0 Memory-Usage | GPU-Util  Compute M. |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0===============================+======================+======================|
|   0  GeForce GTX 1080    On   | 00000000:05:00.0  On |                  N/A |
| 78%   86C    P2   149W / 180W |   4767MiB /  8118MiB |    100%      Default |
+-------------------------------+----------------------+----------------------+
|   1  GeForce GTX 1080    On   | 00000000:0506:00.0  OnOff |                  N/A |
| 78%77%   86C    P2   149W155W / 180W |   4767MiB4569MiB /  8118MiB8119MiB |    100%      Default |
+-------------------------------+----------------------+----------------------+
|   12  GeForce GTX 1080    On   | 00000000:0609:00.0 Off |                  N/A |
| 77%72%   86C    P2   155W124W / 180W |   4569MiB /  8119MiB |    100%      Default |
+-------------------------------+----------------------+----------------------+
|   23  GeForce GTX 1080    On   | 00000000:090A:00.0 Off |                  N/A |
| 72%59%   86C83C    P2   124W134W / 180W |   4569MiB /  8119MiB |    100%      Default |
+-------------------------------+----------------------+----------------------+
|   3  GeForce GTX 1080    On   | 00000000:0A:00.0 Off | 
+-----------------------------------------------------------------------------+
| Processes:                 N/A | | 59%   83C    P2   134W / 180W |                        4569MiB /GPU Memory 8119MiB|
|  GPU    100%   PID   Type   DefaultProcess |
+-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID   Type   Process name                             Usage      |
|===name                             Usage      |
|========================================================================================================================|
|    0      1910      G   /usr/lib/xorg/Xorg                           157MiB |
|    0      2889      G   compiz                                        40MiB |
|    0      5848      C   ../standalone-test.bin                      4557MiB |
|    1      5849      C   ../standalone-test.bin                      4557MiB |
|    2      5850      C   ../standalone-test.bin                      4557MiB |
|    3      5851      C   ../standalone-test.bin                      4557MiB |
+-----------------------------------------------------------------------------+
As for the time it takes per cycle, I have not yet measured them per small, large, or xlarge cycles. I assume with the 5/5/2 cycles, it will complete in 6-8 hours. 
Checking results
View the output logs in the 'Stand_Alone_Validation' directory and make sure the results are matching for each cycle. In this example, I only had 5 small tests on 4x GPU's. The large and Xlarge tests write their own files per GPU_x.
Example:
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+-----------------------------------------------------------------------------+

As for the time it takes per cycle, I have not yet measured them per small, large, or xlarge cycles. I assume with the 5/5/2 cycles, it will complete in 6-8 hours. 
Checking results
View the output logs in the 'Stand_Alone_Validation' directory and make sure the results are matching for each cycle. In this example, I only had 5 small tests on 4x GPU's. The large and Xlarge tests write their own files per GPU_x.
Example:
 Code Block
languagejava
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exx@ubuntu:~/Stand_Alone_Validation$ ./exx-getgpu-validation.sh


The test results will be saved in /tmp/<hostname>_Standard_GPU_validation.txt. View the file and copy the results to the Support Ticket if applicable. 

Interpreting Results
 Code Block
GPU 0: NVIDIA GeForce RTX 4090 (UUID: GPU-886818ec-0907-a70e-613c-9a34d1a3398f)


Validation Results:
./GPU_0.log        : 20, Etot   =    -5821658222.86630688  EKtot   =     1442114396.17682812  EPtot      =    -72638.0430
2.3: 72618.3500 -> Passed
1 card(s) valided for Normal Test

./GPU.large_0.log  : 10, Etot   =    -582162708653.86630371  EKtot   =     14421662946.17688750  EPtot      =    -726383371599.0430
2.4:  Etot   =    -58216.8663  EKtot   =     14421.1768  EPtot      =    -72638.0430
3.0:  Etot9121 -> Passed
1 card(s) valided for Large Test

./GPU.xlarge_0.log :  5, Etot   =  -8862400.5831  EKtot   =    -582162171066.86632500  EKtotEPtot   =   =  14421-11033466.17688331 -> EPtotPassed
1 card(s) valided for XLarge =Test


 -72638.0430
3.1Performance Results:
Location Etot= .
GPU =    -58216.8663  EKtot   =     14421.1768  EPtot     0
Normal=======
High= 506.41
Low = 502.46
Avg = 503.92
Diff=   3.95
Pts =    -72638.0430
3.2:  Etot   =    -58216.8663  EKtot  0.78
 Large=======
High=  24.71
Low =  24.62
Avg =  24.67
Diff=   0.09
Pts =   0.36
 14421.1768  EPtot     XLarge=======
High=  12.32
Low =  12.31
Avg =    -72638.0430
3.3:12.31
Diff=  Etot 0.01
Pts =    -58216.8663  EKtot   =     14421.1768  EPtot      =    -72638.0430
3.4:  Etot   =    -58216.8663  EKtot   =     14421.1768  EPtot      =    -72638.0430


 Info
As you can see above, 0.0 = GPU, cycle = Etot = EKtot = EPtot. I have 4 GPU's that has passed 5 cycles of the small test with matching results.
FAQ
 Note
Is there anyway of running the test on select cards without going through the trouble of opening the case and yanking out power cables/PCIe cards?
...
Answer is yes. 
Yes you can.
This involves a manual declaration of the env vars, and an adjustment of the script to comment 'CUDA_VISIBLE_DEVICES' out, so this does not over-write the UUID of the GPU of the single GPU card to be tested.
This is an applicable solution for a system admin who is comfortable working in the shell or CLI, and the Exxact GPU server or HPC is in a rack or data-center environment.
Expand the content section below to read more.
...
To run the GPU Stand Alone Validation tests against a single card-- we must customize the behavior of the script instead of pulling out the cards and rotating them manually.
It does involve a manual change to the GPU validation script, but I tested this in my lab and it worked as expected.
To run the test against one specific card, you will need to perform the following actions:
  1. Back-up the existing "run_test.x" shell script (just be safe, you can always re-download the entire tgz archive again)
  2. Edit the "run_test.x" using your favorite text editor (nano, vim , etc).
  3. #Comment out "CUDA_VISIBLE_DEVICES=$j",
This is seen (3) times in the run_test script. We are removing it here, because we will define this directly in the bash shell so we don't need to edit this file for each and every run.
  1. Run command, "nvidia-smi -L" to get list of all GPU UUIDs.
  2. For each card, before each run, you will set the GPU UUID for the card you wish to test.
e.g.
...
0.08
Validation Results
This section determines if the GPU is calculating results consistently.
The test logs the output the GPU_N.log, GPU.large_N.log, GPU.xlarge_N.log, respectively. Every time the calculation is run the resulting value should be the same. This section of the script confirms the values are the same for the target GPU
Performance Results
This section determines if the GPU is performing consistently.
The test calculates the average ns/day at which the GPU is performing. In the context of high-performance computing and molecular dynamics simulations, ns/day refers to the number of nanoseconds (ns) of simulation time that you can compute in a single day of real-world time. It’s a useful metric for estimating how much simulation progress you can achieve within a given timeframe. The high the better.
  • High - the highest metric observed
  • Low - the lowest metric observed
  • Avg - the average of metrics observed
  • Diff - the difference between the High and Low values
  • Pts - The percentage of the difference / High values. 
    • This number should be low and not more than 5%.
    • A high value points to an issue.
      • Check GPU temp and ensure there is sufficient airflow to the GPU. Turn the fans up to full and retest. 
      • Swap GPUs and retest to see if the issue follows the GPU or the PCie slot.



 Expand
titleAbout Exxact's Standalone Validation Suite
Exxact's Standalone Validation Suite is a proprietary test adapted from the GPU engine within the AMBER Molecular Dynamics Software Suite. Developed by Ross Walker, the principal developer of the AMBER GPU software, the test works by repeatedly running all atom molecular dynamics simulations (MD) of varying size. There are 3 different size of test designed to stress both the GPU itself and the GPU memory. For each test size a simulation is run that consists of millions of MD steps, each comprising a large combination of single and double precision floating pointing calculations as well as fixed precision integer arithmetic. The calculation includes pair wise electrostatic and van der Waals interactions, Fourier Transforms, inverse R squared calculations, pair list sorts and integration. This computation pattern uses all parts of the GPU and also stresses the GPU memory. At the end of a fixed number of steps for each run, which averages between 15 and 30 mins the final coordinates, energies and velocities of the atoms are recorded. The calculation is then repeated from the same input parameters and again after a fixed number of steps the final coordinates, energies and velocities of the atoms are recorded. The AMBER GPU engine is designed to be bitwise reproducible which means that a simulation started from identical conditions should give identical results. Any variation in the final results is thus an indication of either a bad GPU or bad GPU memory. The test is run for a total of 24 hours and is very effective at identifying faulty GPUs. So effective in fact that it is credited with identifying design flaws and insufficient frequency margins on 5 different NVIDIA GPU models and NVIDIA now includes a variation of this code as part of their chip design testing process. In addition to checking that all GPUs give consistent results the performance of each GPU is tested using the same code. Performance between repeat runs and between GPUs is compared and determined to be within acceptable tolerances before a system is shipped. This approach effectively identifies both faulty GPUs, for example with faulty power and temperature regulators, and any GPUs that might have insufficient cooling due to air flow restrictions, fan issues etc.

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