ClickHouse/utils/iotest/iotest_nonblock.cpp

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#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <stdlib.h>
#include <malloc.h>
#include <poll.h>
#include <iostream>
#include <iomanip>
#include <vector>
#include <Poco/NumberParser.h>
#include <Poco/NumberFormatter.h>
#include <Poco/Exception.h>
#include <Poco/SharedPtr.h>
#include <DB/Core/Exception.h>
#include <statdaemons/threadpool.hpp>
#include <statdaemons/Stopwatch.h>
using DB::throwFromErrno;
enum Mode
{
MODE_READ,
MODE_WRITE,
};
int mainImpl(int argc, char ** argv)
{
const char * file_name = 0;
Mode mode = MODE_READ;
size_t min_offset = 0;
size_t max_offset = 0;
size_t block_size = 0;
size_t descriptors = 0;
size_t count = 0;
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if (argc != 8)
{
std::cerr << "Usage: " << argv[0] << " file_name r|w min_offset max_offset block_size descriptors count" << std::endl;
return 1;
}
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file_name = argv[1];
min_offset = Poco::NumberParser::parseUnsigned64(argv[3]);
max_offset = Poco::NumberParser::parseUnsigned64(argv[4]);
block_size = Poco::NumberParser::parseUnsigned64(argv[5]);
descriptors = Poco::NumberParser::parseUnsigned(argv[6]);
count = Poco::NumberParser::parseUnsigned(argv[7]);
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if (!strcmp(argv[2], "r"))
mode = MODE_READ;
else if (!strcmp(argv[2], "w"))
mode = MODE_WRITE;
else
throw Poco::Exception("Invalid mode");
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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");
}
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std::vector<char> buf(block_size);
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drand48_data rand_data;
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timespec times;
clock_gettime(CLOCK_THREAD_CPUTIME_ID, &times);
srand48_r(times.tv_nsec, &rand_data);
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Stopwatch watch;
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std::vector<pollfd> polls(descriptors);
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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;
}
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size_t ops = 0;
while (ops < count)
{
if (poll(&polls[0], descriptors, -1) <= 0)
throwFromErrno("poll failed");
for (size_t i = 0; i < descriptors; ++i)
{
if (!polls[i].revents)
continue;
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if (polls[i].revents != polls[i].events)
throw Poco::Exception("revents indicates error");
polls[i].revents = 0;
++ops;
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long rand_result1 = 0;
long rand_result2 = 0;
long rand_result3 = 0;
lrand48_r(&rand_data, &rand_result1);
lrand48_r(&rand_data, &rand_result2);
lrand48_r(&rand_data, &rand_result3);
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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;
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if (mode == MODE_READ)
{
if (static_cast<int>(block_size) != pread(fds[i], &buf[0], block_size, offset))
throwFromErrno("Cannot read");
}
else
{
if (static_cast<int>(block_size) != pwrite(fds[i], &buf[0], block_size, offset))
throwFromErrno("Cannot write");
}
}
}
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for (size_t i = 0; i < descriptors; ++i)
{
if (fsync(fds[i]))
throwFromErrno("Cannot fsync");
}
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watch.stop();
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for (size_t i = 0; i < descriptors; ++i)
{
if (0 != close(fds[i]))
throwFromErrno("Cannot close file");
}
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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;
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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;
}
}