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cufile_sample_005.cc
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cufile_sample_005.cc
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/*
* Copyright 2020 NVIDIA Corporation. All rights reserved.
*
* Please refer to the NVIDIA end user license agreement (EULA) associated
* with this source code for terms and conditions that govern your use of
* this software. Any use, reproduction, disclosure, or distribution of
* this software and related documentation outside the terms of the EULA
* is strictly prohibited.
*
*/
/*
* Sample cuFileWrite Test involving device buffer offsets
*
* The test program reads from a file using cuFileBufRegister
* and writes the contents from an offset inside device memory at some offset.
*
* For validation, we match the SHASUM signature of device memory
* contents from the respective buffer offset and the newly created file contents
*
*/
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <fcntl.h>
#include <assert.h>
#include <unistd.h>
#include <cuda_runtime.h>
#include "cufile.h"
#include "cufile_sample_utils.h"
#define MAX_BUFFER_SIZE (1024 * 1024UL)
#define TESTBUFOFFSET (128 * 1024UL)
using namespace std;
int main(int argc, char *argv[]) {
int fd;
ssize_t ret = -1;
void *devPtr = NULL;
const size_t size = MAX_BUFFER_SIZE;
CUfileError_t status;
CUfileDescr_t cf_descr;
CUfileHandle_t cf_handle;
const loff_t fileOff = 0;
unsigned char iDigest[SHA256_DIGEST_LENGTH], oDigest[SHA256_DIGEST_LENGTH];
const char *TESTRANDOMFILE, *TESTFILE;
if(argc < 4) {
std::cerr << argv[0] << " <readfilepath> <writefilepath> <gpuid>"<< std::endl;
exit(1);
}
TESTRANDOMFILE = argv[1];
TESTFILE = argv[2];
check_cudaruntimecall(cudaSetDevice(atoi(argv[3])));
assert(MAX_BUFFER_SIZE > TESTBUFOFFSET);
fd = open(TESTRANDOMFILE, O_RDONLY | O_DIRECT, 0);
if (fd < 0) {
std::cerr << "file open error : " << TESTRANDOMFILE << " "
<< cuFileGetErrorString(errno) << std::endl;
return -1;
}
memset((void *)&cf_descr, 0, sizeof(CUfileDescr_t));
cf_descr.handle.fd = fd;
cf_descr.type = CU_FILE_HANDLE_TYPE_OPAQUE_FD;
status = cuFileHandleRegister(&cf_handle, &cf_descr);
if (status.err != CU_FILE_SUCCESS) {
std::cerr << "file register error: "
<< cuFileGetErrorString(status) << std::endl;
close(fd);
return -1;
}
check_cudaruntimecall(cudaMalloc(&devPtr, size));
status = cuFileBufRegister(devPtr, size, 0);
if (status.err != CU_FILE_SUCCESS) {
std::cerr << "buf register failed: "
<< cuFileGetErrorString(status) << std::endl;
cuFileHandleDeregister(cf_handle);
close(fd);
check_cudaruntimecall(cudaFree(devPtr));
return -1;
}
std::cout << "reading file to device memory : "
<< TESTRANDOMFILE << std::endl;
// read a file with random data to device memory
ret = cuFileRead(cf_handle, devPtr, size, fileOff, 0);
if (ret < 0) {
if (IS_CUFILE_ERR(ret))
std::cerr << "read failed : "
<< cuFileGetErrorString(ret) << std::endl;
else
std::cerr << "read failed : "
<< cuFileGetErrorString(errno) << std::endl;
goto out;
}
std::cout << "read bytes : " << size << std::endl;
cuFileHandleDeregister(cf_handle);
close(fd);
// write random data from device memory to file
fd = open(TESTFILE, O_CREAT | O_RDWR | O_DIRECT, 0664);
if (fd < 0) {
std::cerr << "error opening test file " << TESTFILE
<< " : " << std::strerror(errno) << std::endl;
goto out;
}
memset((void *)&cf_descr, 0, sizeof(CUfileDescr_t));
cf_descr.handle.fd = fd;
cf_descr.type = CU_FILE_HANDLE_TYPE_OPAQUE_FD;
status = cuFileHandleRegister(&cf_handle, &cf_descr);
if (status.err != CU_FILE_SUCCESS) {
std::cerr << "file register error: "
<< cuFileGetErrorString(status) << std::endl;
goto out;
}
std::cout << "writing from device memory, buffer OFFSET :"
<< TESTBUFOFFSET << " to file :" << TESTFILE << std::endl;
ret = cuFileWrite(cf_handle, (char *)devPtr,
size - TESTBUFOFFSET, fileOff, TESTBUFOFFSET);
if (ret < 0) {
if (IS_CUFILE_ERR(ret))
std::cerr << "write failed : "
<< cuFileGetErrorString(ret) << std::endl;
else
std::cerr << "write failed : "
<< cuFileGetErrorString(errno) << std::endl;
goto out;
}
// device memory shasum with bufOffset
ret = SHASUM256_DEVICEMEM(reinterpret_cast<char *>(devPtr), size, iDigest, TESTBUFOFFSET);
if(ret < 0) {
std::cerr << "SHASUM Device mem compute error" << std::endl;
goto out;
}
DumpSHASUM(iDigest);
// file shasum
ret = SHASUM256(TESTFILE, oDigest, size - TESTBUFOFFSET);
if(ret < 0) {
std::cerr << "SHASUM compute error" << std::endl;
goto out;
}
DumpSHASUM(oDigest);
if (memcmp(iDigest, oDigest, SHA256_DIGEST_LENGTH) != 0) {
std::cerr << "SHA SUM Mismatch" << std::endl;
ret = -1;
} else {
std::cout << "SHA SUM Match" << std::endl;
ret = 0;
}
out:
status = cuFileBufDeregister(devPtr);
if (status.err != CU_FILE_SUCCESS) {
std::cerr << "buf deregister failed: "
<< cuFileGetErrorString(status) << std::endl;
ret = -1;
}
check_cudaruntimecall(cudaFree(devPtr));
if (fd > 0) {
cuFileHandleDeregister(cf_handle);
close(fd);
}
return ret;
}