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I have fair amount of experience on GPU programming using CUDA. I used to use clock function inside CUDA kernel (as mentioned in here) to measure ticks of certain operations inside the kernel. I wrote a simple oneAPI kernel and tried to run it on the intel integrated GPU. Errors will be generated.
__kernel void testVecAdd(__global const int *a,__global const int *b,__global int *c,
__global float *t){
clock_t start = clock();
int gid = get_global_id(0);
c[gid] = a[gid] + b[gid];
t[gid] = (float)(clock()-start)/CLOCKS_PER_SEC;
}
error info:
Native API returns: -999 (Unknown OpenCL error code) -999 (Unknown OpenCL error code)Exception caught at file:latency.cpp, line:500
How 2 fix it? Thx
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Hi,
>> Does the tool exist for me to get GPUs(HD serial) L1 and L2 Miss?
In Gen9 compute architecture, the sampler/images includes L1 and L2 cache Miss and buffers include L3 cache miss.
You can get the L1 and L2 miss using the Vtune profiler if you use sycl images/samplers in your application.
Please refer to the below link for more details:
Thanks & Regards,
Noorjahan.
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Hi,
Thanks for reaching out to us.
we can measure the actual kernel execution time on the device using DPC++ built-in profiling API.
Please refer to the below link for more details:
Please get back to us if you face any issues with a sample reproducer.
Thanks & Regards,
Noorjahan.
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Hi Noorjahan,
Thanks for your answer, I would like to use this method to get Memory Latency. so using profiler tool seems not good to do it. Is there a tool in oneAPI to get Memory Latency?
Thanks & Regards,
Dack.
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Hi,
You can try using the Intel® Memory Latency Checker v3.9a tool to get memory latency.
Please refer to the below link for more details regarding MLC tool.
https://www.intel.com/content/www/us/en/developer/articles/tool/intelr-memory-latency-checker.html
You can also use the Vrune profiler tool which you get by downloading oneAPI Basetoolkit to get memory latency.
Please refer to the below link for more details:
Please let us know whether this tool matches your use case.
Thanks & Regards,
Noorjahan.
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Hi Noorjahan,
Thank you for your answer. First, I think the Intel® Memory Latency Checker v3.9a tool only works on the CPU, and I now want to test the GPU's Memory Latency. Secondly, the Vtune profiler tool can only get the L3 Miss of the GPU, I can't get the L1 and L2 Miss. Does the tool exist for me to get GPUs(HD serial) L1 and L2 Miss?
Thanks & Regards,
Dack.
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Hi,
We are checking with the concerned team and we will get back to you soon.
Thanks & Regards,
Noorjahan.
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Hi,
>> Does the tool exist for me to get GPUs(HD serial) L1 and L2 Miss?
In Gen9 compute architecture, the sampler/images includes L1 and L2 cache Miss and buffers include L3 cache miss.
You can get the L1 and L2 miss using the Vtune profiler if you use sycl images/samplers in your application.
Please refer to the below link for more details:
Thanks & Regards,
Noorjahan.
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Hi,
We haven't heard back from you. Could you please provide an update on your issue?
Thanks & Regards,
Noorjahan
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Hi,
Thanks for accepting our solution.
As this issue has been resolved, we will no longer respond to this thread. If you need any additional information, please submit a new question.
Thanks & Regards,
Noorjahan.
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