Calling NPP helper with large image gives kernel execution error

Accelerated Computing GPU-Accelerated Libraries
1

Hi all,

I’m debugging a problem in a CUDA application of ours, which I’ve reduced to the following minimal test case:

nppierror.cu

#include <stdio.h>
#include <stdlib.h>

#include <cuda.h>
#include <npp.h>

#define CHECK_CUDA(S) do { \
    cudaError_t e = S; \
    if (e != cudaSuccess) { \
        fprintf(stderr, "CUDA error at %s:%d: %d\n", __FILE__, __LINE__, e); \
        cudaDeviceReset(); \
        exit(EXIT_FAILURE); \
    } \
} while (false)

#define CHECK_NPP(S) do { \
    NppStatus e = S; \
    if (e != NPP_SUCCESS) { \
        fprintf(stderr, "NPP error at %s:%d: %d\n", __FILE__, __LINE__, e); \
        cudaDeviceReset(); \
        exit(EXIT_FAILURE); \
    } \
} while (false)

int main()
{
    CHECK_CUDA(cudaSetDevice(0));

    size_t free_mem, total_mem;
    CHECK_CUDA(cudaMemGetInfo(&free_mem, &total_mem));
    printf("%ld free, %ld total\n", free_mem, total_mem);

    int width = 1547;
    int height = 524281;

    float *src;
    CHECK_CUDA(cudaMalloc(&src, width * height * sizeof(float)));

    float *dst;
    CHECK_CUDA(cudaMalloc(&dst, width * height * sizeof(float)));

    // Copy from src to dst using nppiCopy_32f_C1R
    NppiSize roi = { width, height };
    int step = width * sizeof(float);
    CHECK_NPP(nppiCopy_32f_C1R(src, step, dst, step, roi));

    CHECK_CUDA(cudaDeviceSynchronize());
    CHECK_CUDA(cudaFree(src));
    CHECK_CUDA(cudaFree(dst));
    CHECK_CUDA(cudaDeviceReset());

    return 0;
}

The program simply allocates two buffers on the GPU, each of size 1547 * 524281 * 4 bytes, and then tries to copy from one to the other using the nppiCopy_32f_C1R helper from NPP.

Makefile

all: nppierror

nppierror: nppierror.o
        g++ $< -lcudart -lnppidei_static -lnppc_static -lculibos -lm -lz -ldl -lpthread -o $@

nppierror.o: nppierror.cu
        nvcc -ccbin clang-4.0 --compiler-options -fPIC -gencode=arch=compute_75,code=compute_75 --std c++11 -c -o $@ $<

clean:
        -rm -f nppierror nppierror.o

Building and running

$ make
nvcc -ccbin clang-4.0 --compiler-options -fPIC -gencode=arch=compute_75,code=compute_75 --std c++11 -c -o nppierror.o nppierror.cu
g++ nppierror.o -lcudart -lnppidei_static -lnppc_static -lculibos -lm -lz -ldl -lpthread -o nppierror
$ ./nppierror 
11382882304 free, 11554717696 total
NPP error at nppierror.cu:45: -1000
$

The -1000 from nppiCopy_32f_C1R indicates a kernel execution error:

$ grep -- -1000 /usr/include/nppdefs.h 
    NPP_CUDA_KERNEL_EXECUTION_ERROR         = -1000,
$

This is with a GeForce RTX 2080 Ti with 11 GB GPU memory on Ubuntu 18.04 running CUDA 10.1.168:

$ nvcc --version
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2019 NVIDIA Corporation
Built on Wed_Apr_24_19:10:27_PDT_2019
Cuda compilation tools, release 10.1, V10.1.168
$ lsb_release -d
Description:    Ubuntu 18.04.3 LTS
$ nvidia-smi -L
GPU 0: GeForce RTX 2080 Ti (UUID: GPU-1c73a2db-6272-67c1-2935-affc2dbf8ed0)
$

If I just reduce height by 1, to 524280, it doesn’t crash. It should not be an out-of-memory problem, since as you can see by the output, there’s 11 GB of free GPU memory when the program runs.

Has anyone seen a problem like this with large images when using the NPP functions?

2

Hello elvstone,
I’m having a similar issue with an embedded Nvidia device. I know it was a while ago but Were you able to figure this out ?
Regards
Lucas

3

what I observe on CUDA 11.4 is that shortly after the image size exceeds 2GB, things stop working. For the code presented, the image size will exceed 2GB when height is larger than 347040. It doesn’t fail at 347041, but by 350000 it is failing.

You may wish to file a bug and as a workaround, use image sizes of 2GB or less.

4

I’m trying with an image of 341x427 and it works. A 512x640 won’t … I’m thinking it has to be something else, but thanks for the feedback !