foundationdb/fdbserver/workloads/AsyncFileWrite.actor.cpp

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2017-05-26 04:48:44 +08:00
/*
* AsyncFileWrite.actor.cpp
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* 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.
*/
#include "flow/actorcompiler.h"
#include "workloads.h"
#include "flow/ActorCollection.h"
#include "flow/SystemMonitor.h"
#include "fdbrpc/IAsyncFile.h"
#include "AsyncFile.actor.h"
struct AsyncFileWriteWorkload : public AsyncFileWorkload
{
//Buffer used to store what is being written
Reference<AsyncFileBuffer> writeBuffer;
//The futures for the asynchronous write futures
vector<Future<Void> > writeFutures;
//Number of writes to perform in parallel. Write tests are performed only if this is greater than zero and numParallelReads is zero
int numParallelWrites;
//The number of bytes written in each call of write
int writeSize;
//Whether or not writes should be performed sequentially
bool sequential;
double averageCpuUtilization;
PerfIntCounter bytesWritten;
AsyncFileWriteWorkload(WorkloadContext const& wcx)
: AsyncFileWorkload(wcx), bytesWritten("Bytes Written"), writeBuffer(NULL)
{
numParallelWrites = getOption(options, LiteralStringRef("numParallelWrites"), 0);
writeSize = getOption(options, LiteralStringRef("writeSize"), _PAGE_SIZE);
fileSize = getOption(options, LiteralStringRef("fileSize"), 10002432);
sequential = getOption(options, LiteralStringRef("sequential"), true);
}
virtual ~AsyncFileWriteWorkload(){ }
virtual std::string description()
{
return "AsyncFileWrite";
}
virtual Future<Void> setup(Database const& cx)
{
if(enabled)
return _setup(this);
return Void();
}
ACTOR Future<Void> _setup(AsyncFileWriteWorkload *self)
{
//Allow only 4K aligned writes if using unbuffered IO
if(self->unbufferedIO && self->writeSize % AsyncFileWorkload::_PAGE_SIZE != 0)
self->writeSize = std::max(AsyncFileWorkload::_PAGE_SIZE, self->writeSize - self->writeSize % AsyncFileWorkload::_PAGE_SIZE);
//Allocate the write buffer
self->writeBuffer = self->allocateBuffer(self->writeSize);
int64_t initialSize = self->fileSize;
if(self->sequential)
initialSize = 0;
Void _ = wait(self->openFile(self, IAsyncFile::OPEN_READWRITE, 0666, initialSize));
int64_t fileSize = wait(self->fileHandle->file->size());
if(fileSize != 0)
self->fileSize = fileSize;
return Void();
}
virtual Future<Void> start(Database const& cx)
{
if(enabled)
return _start(this);
return Void();
}
ACTOR Future<Void> _start(AsyncFileWriteWorkload *self)
{
state StatisticsState statState;
customSystemMonitor("AsyncFile Metrics", &statState);
Void _ = wait(timeout(self->runWriteTest(self), self->testDuration, Void()));
SystemStatistics stats = customSystemMonitor("AsyncFile Metrics", &statState);
self->averageCpuUtilization = stats.processCPUSeconds / stats.elapsed;
//Try to let the IO complete so we can clean up after them
Void _ = wait(timeout(waitForAll(self->writeFutures), 10, Void()));
return Void();
}
ACTOR Future<Void> runWriteTest(AsyncFileWriteWorkload *self)
{
state int64_t offset = self->fileSize;
state Future<Void> prevSync = Void();
loop
{
//Write chunks of the file using different actors
for(int i = 0; i < self->numParallelWrites; i++)
{
//Perform the write. Don't allow it to be cancelled (because the underlying IO may not be cancellable) and don't allow
//objects that the write uses to be deleted
self->writeFutures.push_back
(
uncancellable
(
holdWhile
(
self->fileHandle,
holdWhile(self->writeBuffer, self->fileHandle->file->write(self->writeBuffer->buffer, std::min((int64_t)self->writeSize, self->fileSize - offset), offset))
)
)
);
if(self->sequential)
{
offset += self->writeSize;
//If the file is exhausted, start over at the beginning
if(offset >= self->fileSize)
offset = 0;
}
else if(self->unbufferedIO)
offset = (int64_t)(g_random->random01() * (self->fileSize - 1) / AsyncFileWorkload::_PAGE_SIZE) * AsyncFileWorkload::_PAGE_SIZE;
else
offset = (int64_t)(g_random->random01() * (self->fileSize - 1));
}
Void _ = wait(waitForAll(self->writeFutures));
Void _ = wait(prevSync);
prevSync = self->fileHandle->file->sync();
self->writeFutures.clear();
self->bytesWritten += self->writeSize * self->numParallelWrites;
}
}
virtual void getMetrics(vector<PerfMetric>& m)
{
if(enabled)
{
m.push_back(PerfMetric("Bytes written/sec", bytesWritten.getValue() / testDuration, false));
m.push_back(PerfMetric("Average CPU Utilization (Percentage)", averageCpuUtilization * 100, false));
}
}
};
WorkloadFactory<AsyncFileWriteWorkload> AsyncFileWriteWorkloadFactory("AsyncFileWrite");