ClickHouse/utils/iotest/iotest_aio.cpp

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#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <iostream>
#include <iomanip>
#include <vector>
#include <Poco/NumberParser.h>
#include <Poco/NumberFormatter.h>
#include <Poco/Exception.h>
#include <Common/Exception.h>
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#include <common/ThreadPool.h>
#include <Common/Stopwatch.h>
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#include <stdlib.h>
#if !defined(__APPLE__) && !defined(__FreeBSD__)
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#include <malloc.h>
#endif
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#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#if !defined(__APPLE__) && !defined(__FreeBSD__)
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#include <linux/aio_abi.h>
#endif
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#include <sys/syscall.h>
using DB::throwFromErrno;
inline int io_setup(unsigned nr, aio_context_t *ctxp)
{
return syscall(__NR_io_setup, nr, ctxp);
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}
inline int io_destroy(aio_context_t ctx)
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{
return syscall(__NR_io_destroy, ctx);
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}
inline int io_submit(aio_context_t ctx, long nr, struct iocb **iocbpp)
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{
return syscall(__NR_io_submit, ctx, nr, iocbpp);
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}
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);
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}
enum Mode
{
MODE_READ = 1,
MODE_WRITE = 2,
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};
struct AlignedBuffer
{
int size = 0;
char * data = nullptr;
AlignedBuffer() {}
void init(int size_)
{
uninit();
size_t page = sysconf(_SC_PAGESIZE);
size = size_;
data = static_cast<char*>(memalign(page, (size + page - 1) / page * page));
if (!data)
throwFromErrno("memalign failed");
}
void uninit()
{
if (data)
free(data);
data = nullptr;
size = 0;
}
AlignedBuffer(int size_) : size(0), data(NULL)
{
init(size_);
}
~AlignedBuffer()
{
uninit();
}
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};
struct AioContext
{
aio_context_t ctx;
AioContext()
{
ctx = 0;
if (io_setup(128, &ctx) < 0)
throwFromErrno("io_setup failed");
}
~AioContext()
{
io_destroy(ctx);
}
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};
void thread(int fd, int mode, size_t min_offset, size_t max_offset, size_t block_size, size_t buffers_count, size_t count)
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{
AioContext ctx;
std::vector<AlignedBuffer> buffers(buffers_count);
for (size_t i = 0; i < buffers_count; ++i)
{
buffers[i].init(block_size);
}
drand48_data rand_data;
timespec times;
clock_gettime(CLOCK_THREAD_CPUTIME_ID, &times);
srand48_r(times.tv_nsec, &rand_data);
size_t in_progress = 0;
size_t blocks_sent = 0;
std::vector<bool> buffer_used(buffers_count, false);
std::vector<iocb> iocbs(buffers_count);
std::vector<iocb*> query_cbs;
std::vector<io_event> events(buffers_count);
while (blocks_sent < count || in_progress > 0)
{
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/// Prepare queries.
query_cbs.clear();
for (size_t i = 0; i < buffers_count; ++i)
{
if (blocks_sent >= count || in_progress >= buffers_count)
break;
if (buffer_used[i])
continue;
buffer_used[i] = true;
++blocks_sent;
++in_progress;
char * buf = buffers[i].data;
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);
size_t rand_result = rand_result1 ^ (rand_result2 << 22) ^ (rand_result3 << 43);
size_t offset = min_offset + rand_result % ((max_offset - min_offset) / block_size) * block_size;
iocb & cb = iocbs[i];
memset(&cb, 0, sizeof(cb));
cb.aio_buf = reinterpret_cast<UInt64>(buf);
cb.aio_fildes = fd;
cb.aio_nbytes = block_size;
cb.aio_offset = offset;
cb.aio_data = static_cast<UInt64>(i);
if (mode == MODE_READ)
{
cb.aio_lio_opcode = IOCB_CMD_PREAD;
}
else
{
cb.aio_lio_opcode = IOCB_CMD_PWRITE;
}
query_cbs.push_back(&cb);
}
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/// Send queries.
if (io_submit(ctx.ctx, query_cbs.size(), &query_cbs[0]) < 0)
throwFromErrno("io_submit failed");
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/// Receive answers. If we have something else to send, then receive at least one answer (after that send them), otherwise wait all answers.
memset(&events[0], 0, buffers_count * sizeof(events[0]));
int evs = io_getevents(ctx.ctx, (blocks_sent < count ? 1 : in_progress), buffers_count, &events[0], nullptr);
if (evs < 0)
throwFromErrno("io_getevents failed");
for (int i = 0; i < evs; ++i)
{
int b = static_cast<int>(events[i].data);
if (events[i].res != static_cast<int>(block_size))
throw Poco::Exception("read/write error");
--in_progress;
buffer_used[b] = false;
}
}
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}
int mainImpl(int argc, char ** argv)
{
const char * file_name = 0;
int mode = MODE_READ;
size_t min_offset = 0;
size_t max_offset = 0;
size_t block_size = 0;
size_t buffers_count = 0;
size_t threads_count = 0;
size_t count = 0;
if (argc != 9)
{
std::cerr << "Usage: " << argv[0] << " file_name r|w min_offset max_offset block_size threads buffers count" << std::endl;
return 1;
}
file_name = argv[1];
if (argv[2][0] == 'w')
mode = MODE_WRITE;
min_offset = Poco::NumberParser::parseUnsigned64(argv[3]);
max_offset = Poco::NumberParser::parseUnsigned64(argv[4]);
block_size = Poco::NumberParser::parseUnsigned64(argv[5]);
threads_count = Poco::NumberParser::parseUnsigned(argv[6]);
buffers_count = Poco::NumberParser::parseUnsigned(argv[7]);
count = Poco::NumberParser::parseUnsigned(argv[8]);
int fd = open(file_name, ((mode == MODE_READ) ? O_RDONLY : O_WRONLY) | O_DIRECT);
if (-1 == fd)
throwFromErrno("Cannot open file");
ThreadPool pool(threads_count);
Stopwatch watch;
for (size_t i = 0; i < threads_count; ++i)
pool.schedule(std::bind(thread, fd, mode, min_offset, max_offset, block_size, buffers_count, count));
pool.wait();
watch.stop();
if (0 != close(fd))
throwFromErrno("Cannot close file");
std::cout << std::fixed << std::setprecision(2)
<< "Done " << count << " * " << threads_count << " ops";
std::cout << " in " << watch.elapsedSeconds() << " sec."
<< ", " << count * threads_count / watch.elapsedSeconds() << " ops/sec."
<< ", " << count * threads_count * block_size / watch.elapsedSeconds() / 1000000 << " MB/sec."
<< std::endl;
return 0;
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}
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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}