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aio.cc
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aio.cc
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// -*-c++-*-
// Time-stamp: <2016-01-29 10:47:34 dky>
//-----------------------------------------------------------------------------
// File : aio
// Desc : aio -h
//-----------------------------------------------------------------------------
#ifndef _GNU_SOURCE
#define _GNU_SOURCE /* syscall() is not POSIX */
#endif
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h> /* for perror() */
#include <unistd.h> /* for syscall() */
#include <sys/syscall.h> /* for __NR_* definitions */
#include <linux/aio_abi.h> /* for AIO types and constants */
#ifdef UNIT_TEST
extern "C" {
int io_setup(unsigned nr, aio_context_t *ctxp) __attribute__((weak));
int io_destroy(aio_context_t ctx) __attribute__((weak));
int io_submit(aio_context_t ctx, long nr, struct iocb **iocbpp) __attribute__((weak));
int io_getevents(aio_context_t ctx, long min_nr, long max_nr,
struct io_event *events, struct timespec *timeout) __attribute__((weak));
}
#else
inline int io_setup(unsigned nr, aio_context_t *ctxp)
{
return syscall(__NR_io_setup, nr, ctxp);
}
inline int io_destroy(aio_context_t ctx)
{
return syscall(__NR_io_destroy, ctx);
}
inline int io_submit(aio_context_t ctx, long nr, struct iocb **iocbpp)
{
return syscall(__NR_io_submit, ctx, nr, iocbpp);
}
inline int io_getevents(aio_context_t ctx, long min_nr, long max_nr,
struct io_event *events, struct timespec *timeout)
{
return syscall(__NR_io_getevents, ctx, min_nr, max_nr, events, timeout);
}
#endif
void
usage()
{
fprintf(stderr, "usage: aio -f filename -s fileSize -b blockSize"
" -o read|write [-t thread|process] [-h]\n");
fprintf(stderr, " -f Name of the file to read or write\n");
fprintf(stderr, " -s File size (multiple of block size)"
" in bytes (10), mb (10m) or gb (10g)\n");
fprintf(stderr, " -b Block size in bytes (10), mb (10m)"
" or gb (10g)\n");
fprintf(stderr, " -o IO operation to perform on the file"
" [read|write]\n");
fprintf(stderr, " -t High resolution timer to use\n");
fprintf(stderr, " -h Display this help\n\n");
return;
}
size_t
get_size(char *size_str)
{
size_t size = 0;
size_t len = strlen(size_str);
switch (size_str[len - 1]) {
case 'k':
case 'K':
size = 1024;
break;
case 'm':
case 'M':
size = 1024 * 1024;
break;
case 'g':
case 'G':
size = 1024 * 1024 * 1024;
break;
default:
size = 1;
break;
}
if (size > 1) {
size_str[len - 1] = '\0';
}
size *= atoll(size_str);
return size;
}
int main(int argc, char *argv[])
{
clockid_t cid = CLOCK_THREAD_CPUTIME_ID;
int err = 0;
int ret = -1;
int op = -1;
size_t size = 0;
size_t bsize = 0;
char *file = NULL;
size_t chunks = 0;
size_t iterations = 1;
// Parse the input arguments
char c;
while ((c = getopt (argc, argv, "s:f:o:b:t:i:h")) != -1) {
switch (c)
{
case 's':
size = get_size(optarg);
break;
case 'f':
file = optarg;
break;
case 'i':
iterations = atoll(optarg);
if (0 == iterations) {
fprintf(stderr, "Error: Invalid \"%s\" iterations specified\n",
optarg);
usage();
return -EINVAL;
}
break;
case 'o':
op = (strcasecmp("read", optarg) == 0) ? 0
: (strcasecmp("write", optarg) == 0) ? 1 : -1;
if (-1 == op) {
fprintf(stderr, "Error: Unrecognized IO operation \'%s\'\n",
optarg);
return -1;
}
break;
case 'b':
bsize = get_size(optarg);
break;
case 't':
cid = (strcasecmp("thread", optarg) == 0)
? CLOCK_THREAD_CPUTIME_ID
: (strcasecmp("process", optarg) == 0)
? CLOCK_PROCESS_CPUTIME_ID : -1;
if (-1 == cid) {
fprintf(stderr, "Error: Unrecognized timer specified \'%s\'\n",
optarg);
return -1;
}
break;
case 'h':
usage();
return 0;
case '?':
if (optopt == 'f' || optopt == 's' ||
optopt == 'o' || optopt == 'b')
fprintf (stderr, "Option -%c requires an argument.\n", optopt);
usage();
return -1;
default:
break;
}
}
if (NULL == file || 0 == size || bsize == 0 || op == -1) {
fprintf(stderr, "Error: Insufficient arguments\n");
usage();
return -1;
}
if (bsize > size) {
fprintf(stderr, "Error: Block size %lu cannot be greater"
" than file size %lu\n", bsize, size);
return -1;
}
// Ensure we have a file size that is a multiple of block size
if (size % bsize) {
fprintf(stderr, "Info: File size padded by %lu bytes to be"
" a multiple of block size\n", (size % bsize));
size += size % bsize;
}
// Compute the chunk size
chunks = size/bsize;
// Setup I/O control block
struct iocb **cbs = (struct iocb **)calloc(chunks, sizeof(struct iocb *));
if (NULL == cbs) {
err = errno;
perror("failed to allocate memory");
return err;
}
// Allocate the data buffers and initialize it
for (size_t cc = 0; cc < chunks; cc++) {
cbs[cc] = (struct iocb *)malloc(sizeof(struct iocb));
if (NULL == cbs[cc]) {
err = errno;
perror("failed to allocate memory");
return err;
}
memset(cbs[cc], 0, sizeof(struct iocb));
cbs[cc]->aio_lio_opcode = (0 == op) ? IOCB_CMD_PREAD: IOCB_CMD_PWRITE;
// Construct the data buffer
char *data = (char *)malloc(bsize);
if (NULL == data) {
err = errno;
perror("failed to allocate memory");
return err;
}
memset(data, (op == 0) ? '\0' : 'w', bsize);
// Add new line to enable testing ops via 'wc'
if (op == 1) {
data[bsize - 1] = '\n';
}
cbs[cc]->aio_buf = (size_t)data;
cbs[cc]->aio_data = (size_t)data;
cbs[cc]->aio_offset = (cc * bsize);
cbs[cc]->aio_nbytes = bsize;
}
// Construct the events list
struct io_event *events = (io_event *)malloc(chunks * sizeof(struct io_event));
if (NULL == events) {
err = errno;
perror("failed to allocate memory");
return err;
}
memset(events, 0, chunks * sizeof(struct io_event));
aio_context_t ctx = {0};
ret = io_setup(chunks, &ctx);
if (ret < 0) {
err = errno;
perror("io_setup error");
if (err == EAGAIN) {
fprintf(stderr, "Hint: consider increasing aio-max-nr via"
" \"sysctl -w fs.aio-max-nr=%lu\"\n", chunks);
}
return err;
}
fprintf(stdout, "%s file of size %lu in %lu chunks of block size %lu"
" in %lu iteration%c\n",
(op == 0) ? "Reading": "Writing",
size, chunks, bsize, iterations, (iterations > 1) ? 's' :' ');
// Average throughput
double throughput = 0.0;
size_t iter = 0;
do {
// Track the time
struct timespec stime = {0};
struct timespec etime = {0};
int fd = open(file, (( op == 0) ? O_RDONLY : O_WRONLY|O_TRUNC|O_CREAT)|
O_DIRECT|O_SYNC, 0664);
if (fd < 0) {
err = errno;
perror("open error");
return err;
}
// Update the fd on all iocb
for (size_t cc = 0; cc < chunks; cc++) {
cbs[cc]->aio_fildes = fd;
}
// Record the start time
clock_gettime(cid, &stime);
// ASYNC block read/write
ret = io_submit(ctx, chunks, cbs);
if (ret != (int)chunks) {
err = errno;
if (ret < 0)
perror("io_submit error");
else
fprintf(stderr, "could not sumbit IOs");
return err;
}
// Get IO completion events
size_t completion_events = 0;
do {
ret = io_getevents(ctx, 1, (chunks - completion_events), events, NULL);
if (ret > 0) {
completion_events += ret;
} else {
perror("io_getevents error");
}
} while (completion_events < chunks);
// Record the start time
clock_gettime(cid, &etime);
close(fd);
// Compute the throughput
size_t dnsecs = (((etime.tv_sec * 1000000000) + etime.tv_nsec) -
((stime.tv_sec * 1000000000) + stime.tv_nsec));
double delta_secs = dnsecs/1000000000.0;
double tp = ((size/(1024.0 * 1024.0))/delta_secs);
// Compute the average throughput
if (0 == iter) {
throughput = tp;
} else {
throughput = (throughput + tp)/2.0;
}
// Printing average makes sense for multiple iterations
if (iterations > 1) {
fprintf(stdout, "Throughput[%f]: %f mb/secs\n", throughput, tp);
}
} while (++iter < iterations);
// Cleanup before exiting
ret = io_destroy(ctx);
if (ret < 0) {
err = errno;
perror("io_destroy error");
return err;
}
// Free all the allocated resources
for (size_t cc = 0; cc < chunks; cc++) {
free((void *)cbs[cc]->aio_buf);
free(cbs[cc]);
}
free(cbs);
free(events);
fprintf(stdout, "Throughput: %f mb/secs\n", throughput);
return 0;
}