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/*
* This file is open source software, licensed to you under the terms
* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. You may not use this file except in compliance with the License.
*
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/*
* Copyright (C) 2014-2015 Cloudius Systems, Ltd.
*/
#include <seastar/testing/test_case.hh>
#include <seastar/core/semaphore.hh>
#include <seastar/core/condition-variable.hh>
#include <seastar/core/file.hh>
#include <seastar/core/reactor.hh>
#include <seastar/core/thread.hh>
#include <seastar/core/stall_sampler.hh>
#include <iostream>
using namespace seastar;
SEASTAR_TEST_CASE(open_flags_test) {
open_flags flags = open_flags::rw | open_flags::create | open_flags::exclusive;
BOOST_REQUIRE(std::underlying_type_t<open_flags>(flags) ==
(std::underlying_type_t<open_flags>(open_flags::rw) |
std::underlying_type_t<open_flags>(open_flags::create) |
std::underlying_type_t<open_flags>(open_flags::exclusive)));
open_flags mask = open_flags::create | open_flags::exclusive;
BOOST_REQUIRE((flags & mask) == mask);
return make_ready_future<>();
}
struct file_test {
file_test(file&& f) : f(std::move(f)) {}
file f;
semaphore sem = { 0 };
semaphore par = { 1000 };
};
SEASTAR_TEST_CASE(test1) {
// Note: this tests generates a file "testfile.tmp" with size 4096 * max (= 40 MB).
static constexpr auto max = 10000;
return open_file_dma("testfile.tmp", open_flags::rw | open_flags::create).then([] (file f) {
auto ft = new file_test{std::move(f)};
for (size_t i = 0; i < max; ++i) {
ft->par.wait().then([ft, i] {
auto wbuf = allocate_aligned_buffer<unsigned char>(4096, 4096);
std::fill(wbuf.get(), wbuf.get() + 4096, i);
auto wb = wbuf.get();
ft->f.dma_write(i * 4096, wb, 4096).then(
[ft, i, wbuf = std::move(wbuf)] (size_t ret) mutable {
BOOST_REQUIRE(ret == 4096);
auto rbuf = allocate_aligned_buffer<unsigned char>(4096, 4096);
auto rb = rbuf.get();
ft->f.dma_read(i * 4096, rb, 4096).then(
[ft, rbuf = std::move(rbuf), wbuf = std::move(wbuf)] (size_t ret) mutable {
BOOST_REQUIRE(ret == 4096);
BOOST_REQUIRE(std::equal(rbuf.get(), rbuf.get() + 4096, wbuf.get()));
ft->sem.signal(1);
ft->par.signal();
});
});
});
}
return ft->sem.wait(max).then([ft] () mutable {
return ft->f.flush();
}).then([ft] {
return ft->f.close();
}).then([ft] () mutable {
std::cout << "done\n";
delete ft;
});
});
}
SEASTAR_TEST_CASE(parallel_write_fsync) {
return internal::report_reactor_stalls([] {
return async([] {
// Plan: open a file and write to it like crazy. In parallel fsync() it all the time.
auto fname = "testfile.tmp";
auto sz = uint64_t(32*1024*1024);
auto buffer_size = 32768;
auto write_concurrency = 16;
auto fsync_every = 1024*1024;
auto max_write_ahead_of_fsync = 4*1024*1024; // ensures writes don't complete too quickly
auto written = uint64_t(0);
auto fsynced_at = uint64_t(0);
file f = open_file_dma(fname, open_flags::rw | open_flags::create | open_flags::truncate).get0();
// Avoid filesystem problems with size-extending operations
f.truncate(sz).get();
auto fsync_semaphore = semaphore(0);
auto may_write_condvar = condition_variable();
auto fsync_thread = thread([&] {
auto fsynced = uint64_t(0);
while (fsynced < sz) {
fsync_semaphore.wait(fsync_every).get();
fsynced_at = written;
// Signal the condition variable now so that writes proceed
// in parallel with the fsync
may_write_condvar.broadcast();
f.flush().get();
fsynced += fsync_every;
}
});
auto write_semaphore = semaphore(write_concurrency);
while (written < sz) {
write_semaphore.wait().get();
may_write_condvar.wait([&] {
return written <= fsynced_at + max_write_ahead_of_fsync;
}).get();
auto buf = temporary_buffer<char>::aligned(f.memory_dma_alignment(), buffer_size);
f.dma_write(written, buf.get(), buf.size()).then([&fsync_semaphore, &write_semaphore, buf = std::move(buf)] (size_t w) {
fsync_semaphore.signal(buf.size());
write_semaphore.signal();
});
written += buffer_size;
}
write_semaphore.wait(write_concurrency).get();
fsync_thread.join().get();
f.close().get();
remove_file(fname).get();
});
}).then([] (internal::stall_report sr) {
std::cout << "parallel_write_fsync: " << sr << "\n";
});
}
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