mirror of
https://github.com/NVIDIA/cuda-samples.git
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124 lines
4.7 KiB
C++
124 lines
4.7 KiB
C++
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// This sample demonstrates how to use the CUDA hook library to receive
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// callbacks
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#include <cuda.h>
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#include <stdio.h>
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#include <dlfcn.h>
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#include "libcuhook.h"
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#define ASSERT_COND(x, msg) \
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do { \
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if (!(x)) { \
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fprintf(stderr, "Error: Condition (%s) failed at %s:%d\n", #x, __FILE__, \
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__LINE__); \
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fprintf(stderr, "cuHook sample failed (%s)\n", msg); \
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exit(1); \
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} \
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} while (0)
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/*
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** Example of how to use the CUDA Interception Library, libcuhook.so
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** The library has to be loaded via LD_PRELOAD, e.g.
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*LD_PRELOAD=<full_path>/libcuhook.so.1 ./cuHook
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*/
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static int allocation_cb = 0;
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static int free_cb = 0;
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static int destroy_ctx_cb = 0;
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CUresult device_allocation_callback(CUdeviceptr *dptr, size_t bytesize) {
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fprintf(stdout, "Received memory allocation callback!\n");
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allocation_cb++;
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return CUDA_SUCCESS;
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}
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CUresult device_free_callback(CUdeviceptr dptr) {
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fprintf(stdout, "Received memory de-allocation callback!\n");
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free_cb++;
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return CUDA_SUCCESS;
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}
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CUresult destroy_context_callback(CUcontext ctx) {
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fprintf(stdout, "Received context destroy event!\n");
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destroy_ctx_cb++;
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return CUDA_SUCCESS;
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}
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int main() {
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int count;
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CUcontext ctx;
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count = 0;
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cuInit(0);
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cuDeviceGetCount(&count);
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ASSERT_COND(count > 0, "No suitable devices found");
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// Load the cudaHookRegisterCallback symbol using the default library search
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// order. If we found the symbol, then the hooking library has been loaded
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fnCuHookRegisterCallback cuHook =
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(fnCuHookRegisterCallback)dlsym(RTLD_DEFAULT, "cuHookRegisterCallback");
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// ASSERT_COND(cuHook, dlerror());
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if (cuHook) {
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// CUDA Runtime symbols cannot be hooked but the underlying driver ones
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// _can_. Example:
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// - cudaFree() will trigger cuMemFree
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// - cudaDeviceReset() will trigger a context change and you would need to
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// intercept cuCtxGetCurrent/cuCtxSetCurrent
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cuHook(CU_HOOK_MEM_ALLOC, POST_CALL_HOOK,
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(void *)device_allocation_callback);
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cuHook(CU_HOOK_MEM_FREE, PRE_CALL_HOOK, (void *)device_free_callback);
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cuHook(CU_HOOK_CTX_DESTROY, POST_CALL_HOOK,
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(void *)destroy_context_callback);
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}
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cuCtxCreate(&ctx, 0, 0);
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{
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CUresult status;
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CUdeviceptr dptr;
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status = cuMemAlloc(&dptr, 1024);
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ASSERT_COND(status == CUDA_SUCCESS, "cuMemAlloc call failed");
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status = cuMemFree(dptr);
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ASSERT_COND(status == CUDA_SUCCESS, "cuMemFree call failed");
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}
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cuCtxDestroy(ctx);
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ASSERT_COND(allocation_cb == 1, "Didn't receive the allocation callback");
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ASSERT_COND(free_cb == 1, "Didn't receive the free callback");
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ASSERT_COND(destroy_ctx_cb == 1,
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"Didn't receive the destroy context callback");
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fprintf(stdout, "Sample finished successfully.\n");
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return (0);
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}
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