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#include <fcntl.h>
#include <port/unistd.h>
#include <stdlib.h>
#include <time.h>
#include <stdlib.h>
#if !defined(__APPLE__) && !defined(__FreeBSD__)
#include <malloc.h>
#endif
#include <poll.h>
#include <iostream>
#include <iomanip>
#include <vector>
#include <random>
#include <pcg_random.hpp>
#include <IO/ReadHelpers.h>
#include <Poco/Exception.h>
#include <Common/Exception.h>
#include <Common/randomSeed.h>
#include <common/ThreadPool.h>
#include <Common/Stopwatch.h>
#include <port/clock.h>
namespace DB
{
namespace ErrorCodes
{
extern const int CANNOT_OPEN_FILE;
extern const int CANNOT_CLOSE_FILE;
extern const int CANNOT_READ_FROM_FILE_DESCRIPTOR;
extern const int CANNOT_WRITE_TO_FILE_DESCRIPTOR;
extern const int CANNOT_FSYNC;
extern const int SYSTEM_ERROR;
}
}
enum Mode
{
MODE_READ,
MODE_WRITE,
};
int mainImpl(int argc, char ** argv)
{
using namespace DB;
const char * file_name = 0;
Mode mode = MODE_READ;
UInt64 min_offset = 0;
UInt64 max_offset = 0;
UInt64 block_size = 0;
UInt64 descriptors = 0;
UInt64 count = 0;
if (argc != 8)
{
std::cerr << "Usage: " << argv[0] << " file_name r|w min_offset max_offset block_size descriptors count" << std::endl;
return 1;
}
file_name = argv[1];
min_offset = parse<UInt64>(argv[3]);
max_offset = parse<UInt64>(argv[4]);
block_size = parse<UInt64>(argv[5]);
descriptors = parse<UInt64>(argv[6]);
count = parse<UInt64>(argv[7]);
if (!strcmp(argv[2], "r"))
mode = MODE_READ;
else if (!strcmp(argv[2], "w"))
mode = MODE_WRITE;
else
throw Poco::Exception("Invalid mode");
std::vector<int> fds(descriptors);
for (size_t i = 0; i < descriptors; ++i)
{
fds[i] = open(file_name, O_SYNC | ((mode == MODE_READ) ? O_RDONLY : O_WRONLY));
if (-1 == fds[i])
throwFromErrno("Cannot open file", ErrorCodes::CANNOT_OPEN_FILE);
}
std::vector<char> buf(block_size);
pcg64 rng(randomSeed());
Stopwatch watch;
std::vector<pollfd> polls(descriptors);
for (size_t i = 0; i < descriptors; ++i)
{
polls[i].fd = fds[i];
polls[i].events = (mode == MODE_READ) ? POLLIN : POLLOUT;
polls[i].revents = 0;
}
size_t ops = 0;
while (ops < count)
{
if (poll(&polls[0], descriptors, -1) <= 0)
throwFromErrno("poll failed", ErrorCodes::SYSTEM_ERROR);
for (size_t i = 0; i < descriptors; ++i)
{
if (!polls[i].revents)
continue;
if (polls[i].revents != polls[i].events)
throw Poco::Exception("revents indicates error");
polls[i].revents = 0;
++ops;
long rand_result1 = rng();
long rand_result2 = rng();
long rand_result3 = rng();
size_t rand_result = rand_result1 ^ (rand_result2 << 22) ^ (rand_result3 << 43);
size_t offset;
offset = min_offset + rand_result % ((max_offset - min_offset) / block_size) * block_size;
if (mode == MODE_READ)
{
if (static_cast<int>(block_size) != pread(fds[i], &buf[0], block_size, offset))
throwFromErrno("Cannot read", ErrorCodes::CANNOT_READ_FROM_FILE_DESCRIPTOR);
}
else
{
if (static_cast<int>(block_size) != pwrite(fds[i], &buf[0], block_size, offset))
throwFromErrno("Cannot write", ErrorCodes::CANNOT_WRITE_TO_FILE_DESCRIPTOR);
}
}
}
for (size_t i = 0; i < descriptors; ++i)
{
if (fsync(fds[i]))
throwFromErrno("Cannot fsync", ErrorCodes::CANNOT_FSYNC);
}
watch.stop();
for (size_t i = 0; i < descriptors; ++i)
{
if (0 != close(fds[i]))
throwFromErrno("Cannot close file", ErrorCodes::CANNOT_CLOSE_FILE);
}
std::cout << std::fixed << std::setprecision(2)
<< "Done " << count << " ops" << " in " << watch.elapsedSeconds() << " sec."
<< ", " << count / watch.elapsedSeconds() << " ops/sec."
<< ", " << count * block_size / watch.elapsedSeconds() / 1000000 << " MB/sec."
<< std::endl;
return 0;
}
int main(int argc, char ** argv)
{
try
{
return mainImpl(argc, argv);
}
catch (const Poco::Exception & e)
{
std::cerr << e.what() << ", " << e.message() << std::endl;
return 1;
}
}
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