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cufile_sample_020.cc
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cufile_sample_020.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 cuFileBatchIOSubmit Read Test.
*
* This sample program reads data from GPU memory to a file using the Batch API's.
* For verification, input data has a pattern.
* User can verify the output file-data after write using
* hexdump -C <filepath>
* 00000000 ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab |................|
*/
#include <fcntl.h>
#include <assert.h>
#include <unistd.h>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <cuda_runtime.h>
//include this header file
#include "cufile.h"
#include "cufile_sample_utils.h"
using namespace std;
#define MAX_BUFFER_SIZE 4096
#define MAX_BATCH_IOS 128
int main(int argc, char *argv[]) {
int fd[MAX_BATCH_IOS];
int nonDirFlag = 0;
ssize_t ret = -1;
void *devPtr[MAX_BATCH_IOS];
const size_t size = MAX_BUFFER_SIZE;
CUfileError_t status;
const char *TESTFILE;
CUfileDescr_t cf_descr[MAX_BATCH_IOS];
CUfileHandle_t cf_handle[MAX_BATCH_IOS];
unsigned int i = 0;
CUfileIOParams_t io_batch_params[MAX_BATCH_IOS];
CUfileIOEvents_t io_batch_events[MAX_BATCH_IOS];
unsigned int flags = 0;
CUstream stream;
CUfileError_t errorBatch;
CUfileBatchHandle_t batch_id;
unsigned nr;
unsigned batch_size;
unsigned num_completed = 0;
if(argc < 4) {
std::cerr << argv[0] << " <filepath> <gpuid> <num batch entries> <nondirectflag>"<< std::endl;
exit(1);
}
memset(&stream, 0, sizeof(CUstream));
TESTFILE = argv[1];
check_cudaruntimecall(cudaSetDevice(atoi(argv[2])));
status = cuFileDriverOpen();
if (status.err != CU_FILE_SUCCESS) {
std::cerr << "cufile driver open error: "
<< cuFileGetErrorString(status) << std::endl;
return -1;
}
std::cout << "opening file " << TESTFILE << std::endl;
batch_size = atoi(argv[3]);
if(batch_size > MAX_BATCH_IOS) {
std::cerr << "Requested batch Size exceeds maximum Batch Size limit:" << MAX_BATCH_IOS << std::endl;
return -1;
}
// opens a file to write
if (argc > 4)
nonDirFlag = atoi(argv[4]);
for(i = 0; i < batch_size; i++) {
if (nonDirFlag == 0) {
fd[i] = open(TESTFILE, O_CREAT | O_RDWR | O_DIRECT, 0664);
} else {
if (i % 2 == 0) {
fd[i] = open(TESTFILE, O_CREAT | O_RDWR | O_DIRECT, 0664);
} else {
fd[i] = open(TESTFILE, O_CREAT | O_RDWR, 0664);
}
}
if (fd[i] < 0) {
std::cerr << "file open error:"
<< cuFileGetErrorString(errno) << std::endl;
goto out1;
}
}
memset((void *)cf_descr, 0, MAX_BATCH_IOS * sizeof(CUfileDescr_t));
for(i = 0; i < batch_size; i++) {
cf_descr[i].handle.fd = fd[i];
cf_descr[i].type = CU_FILE_HANDLE_TYPE_OPAQUE_FD;
status = cuFileHandleRegister(&cf_handle[i], &cf_descr[i]);
if (status.err != CU_FILE_SUCCESS) {
std::cerr << "file register error:"
<< cuFileGetErrorString(status) << std::endl;
close(fd[i]);
fd[i] = -1;
goto out1;
}
}
for(i = 0; i < batch_size; i++) {
devPtr[i] = NULL;
check_cudaruntimecall(cudaMalloc(&devPtr[i], size));
check_cudaruntimecall(cudaMemset((void*)(devPtr[i]), 0xab, size));
check_cudaruntimecall(cudaStreamSynchronize(0));
}
// filler
std::cout << "registering device memory of size :" << size << std::endl;
// registers device memory
for(i = 0; i < batch_size; i++) {
status = cuFileBufRegister(devPtr[i], size, 0);
if (status.err != CU_FILE_SUCCESS) {
ret = -1;
std::cerr << "buffer register failed:"
<< cuFileGetErrorString(status) << std::endl;
goto out2;
}
}
std::cout << "writing from device memory" << std::endl;
for(i = 0; i < batch_size; i++) {
io_batch_params[i].mode = CUFILE_BATCH;
io_batch_params[i].fh = cf_handle[i];
io_batch_params[i].u.batch.devPtr_base = devPtr[i];
io_batch_params[i].u.batch.file_offset = i * size;
io_batch_params[i].u.batch.devPtr_offset = 0;
io_batch_params[i].u.batch.size = size;
io_batch_params[i].opcode = CUFILE_READ;
}
std::cout << "Setting Up Batch" << std::endl;
errorBatch = cuFileBatchIOSetUp(&batch_id, batch_size);
if(errorBatch.err != 0) {
std::cerr << "Error in setting Up Batch" << std::endl;
goto out3;
}
std::cout << "Submitting Batch IO" << std::endl;
errorBatch = cuFileBatchIOSubmit(batch_id, batch_size, io_batch_params, flags);
if(errorBatch.err != 0) {
std::cerr << "Error in IO Batch Submit" << std::endl;
goto out3;
}
std::cout << "Batch IO Submitted" << std::endl;
while(num_completed != batch_size) {
memset(io_batch_events, 0, sizeof(*io_batch_events));
nr = batch_size;
errorBatch = cuFileBatchIOGetStatus(batch_id, batch_size, &nr, io_batch_events, NULL);
if(errorBatch.err != 0) {
std::cerr << "Error in IO Batch Get Status" << std::endl;
goto out4;
}
std::cout << "Got events " << nr << std::endl;
num_completed += nr;
for(i = 0; i < nr; i++) {
uint64_t buf[MAX_BUFFER_SIZE];
cudaMemcpy(buf, io_batch_params[i].u.batch.devPtr_base, io_batch_events[i].ret, cudaMemcpyDeviceToHost);
std::cout << "Completed IO, index" << i << "size: " << io_batch_events[i].ret << std::endl;
}
}
std::cout << "Batch IO Get status done got completetions for " << nr << " events" << std::endl;
out4:
cuFileBatchIODestroy(batch_id);
//Submit Batch IO
std::cout << "deregistering device memory" << std::endl;
out3:
// deregister the device memory
for(i = 0; i < batch_size; i++) {
status = cuFileBufDeregister(devPtr[i]);
if (status.err != CU_FILE_SUCCESS) {
ret = -1;
std::cerr << "buffer deregister failed:"
<< cuFileGetErrorString(status) << std::endl;
}
}
std::cout << "cuFile BufDeregsiter Done" << std::endl;
out2:
for(i = 0; i < batch_size; i++) {
check_cudaruntimecall(cudaFree(devPtr[i]));
}
std::cout << "cudaFree Done" << std::endl;
out1:
// close file
for(i = 0; i < batch_size; i++) {
if (fd[i] > 0) {
cuFileHandleDeregister(cf_handle[i]);
close(fd[i]);
}
}
std::cout << "cuFileHandleDeregister Done" << std::endl;
status = cuFileDriverClose();
std::cout << "cuFileDriverClose Done" << std::endl;
if (status.err != CU_FILE_SUCCESS) {
ret = -1;
std::cerr << "cufile driver close failed:"
<< cuFileGetErrorString(status) << std::endl;
}
ret = 0;
return ret;
}