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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "hw_info_sampler.h"
#include <vespa/config/config.h>
#include <vespa/config/common/configholder.h>
#include <vespa/config/file/filesource.h>
#include <vespa/searchcore/config/config-hwinfo.h>
#include <vespa/config/print/fileconfigwriter.h>
#include <vespa/vespalib/io/fileutil.h>
#include <vespa/fastos/file.h>
using config::ConfigHandle;
using config::ConfigSubscriber;
using config::FileSpec;
using vespa::config::search::core::HwinfoConfig;
using vespa::config::search::core::HwinfoConfigBuilder;
using vespalib::alloc::Alloc;
using Clock = std::chrono::system_clock;
namespace proton {
namespace {
std::unique_ptr<HwinfoConfig> readConfig(const vespalib::string &path) {
FileSpec spec(path + "/" + "hwinfo.cfg");
ConfigSubscriber s(spec);
std::unique_ptr<ConfigHandle<HwinfoConfig>> handle = s.subscribe<HwinfoConfig>("hwinfo");
s.nextConfig(0);
return std::move(handle->getConfig());
}
void writeConfig(const vespalib::string &path,
double diskWriteSpeed, Clock::time_point sampleTime)
{
HwinfoConfigBuilder builder;
builder.disk.writespeed = diskWriteSpeed;
builder.disk.sampletime = std::chrono::duration_cast<std::chrono::seconds>(sampleTime.time_since_epoch()).count();
config::FileConfigWriter writer(path + "/hwinfo.cfg");
if (!writer.write(builder)) {
abort();
}
}
double measureDiskWriteSpeed(const vespalib::string &path,
size_t diskWriteLen)
{
FastOS_File testFile;
vespalib::string fileName = path + "/hwinfo-writespeed";
size_t bufferLen = 1024 * 1024;
Alloc buffer(Alloc::allocMMap(bufferLen));
memset(buffer.get(), 0, buffer.size());
testFile.EnableDirectIO();
testFile.OpenWriteOnlyTruncate(fileName.c_str());
sync();
sleep(1);
sync();
sleep(1);
Clock::time_point before = Clock::now();
size_t residue = diskWriteLen;
while (residue > 0) {
size_t writeNow = std::min(residue, bufferLen);
testFile.WriteBuf(buffer.get(), writeNow);
residue -= writeNow;
}
Clock::time_point after = Clock::now();
testFile.Close();
vespalib::unlink(fileName);
double elapsed = std::chrono::duration<double>(after - before).count();
double diskWriteSpeed = diskWriteLen / elapsed / 1024 / 1024;
return diskWriteSpeed;
}
}
HwInfoSampler::HwInfoSampler(const vespalib::string &path,
const Config &config)
: _hwInfo(),
_sampleTime(),
_diskWriteSpeed(0.0)
{
if (config._diskWriteSpeedOverride != 0) {
_diskWriteSpeed = config._diskWriteSpeedOverride;
_sampleTime = Clock::now();
} else {
auto cfg = readConfig(path);
if (cfg && cfg->disk.sampletime != 0.0) {
_sampleTime = std::chrono::time_point<Clock>(std::chrono::seconds(cfg->disk.sampletime));
_diskWriteSpeed = cfg->disk.writespeed;
} else {
sample(path, config);
}
}
setup(config);
}
HwInfoSampler::~HwInfoSampler()
{
}
void
HwInfoSampler::setup(const Config &config)
{
bool slowDisk = _diskWriteSpeed < config._slowWriteSpeedLimit;
_hwInfo = HwInfo(slowDisk);
}
void
HwInfoSampler::sample(const vespalib::string &path, const Config &config)
{
size_t minDiskWriteLen = 1024u * 1024u;
size_t diskWriteLen = config._diskSampleWriteSize;
diskWriteLen = std::max(diskWriteLen, minDiskWriteLen);
_sampleTime = Clock::now();
_diskWriteSpeed = measureDiskWriteSpeed(path, diskWriteLen);
writeConfig(path, _diskWriteSpeed, _sampleTime);
}
}
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