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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "hw_info_sampler.h"
#include <vespa/config-hwinfo.h>
#include <vespa/config/print/fileconfigwriter.h>
#include <vespa/config/subscription/configsubscriber.hpp>
#include <vespa/fastos/file.h>
#include <vespa/vespalib/util/time.h>
#include <vespa/vespalib/util/resource_limits.h>
#include <vespa/vespalib/util/size_literals.h>
#include <vespa/vespalib/util/alloc.h>
#include <unistd.h>
#include <filesystem>
#include <thread>
#include <vespa/log/log.h>
LOG_SETUP(".proton.common.hw_info_sampler");
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 {
uint64_t
sampleDiskSizeBytes(const std::string &pathStr, const HwInfoSampler::Config &cfg)
{
if (cfg.diskSizeBytes != 0) {
return cfg.diskSizeBytes;
}
std::filesystem::path path(pathStr);
auto space_info = std::filesystem::space(path);
return space_info.capacity;
}
uint64_t
sampleMemorySizeBytes(const HwInfoSampler::Config &cfg, const vespalib::ResourceLimits& resource_limits)
{
if (cfg.memorySizeBytes != 0) {
return cfg.memorySizeBytes;
}
return resource_limits.memory();
}
uint32_t
sampleCpuCores(const HwInfoSampler::Config &cfg, const vespalib::ResourceLimits& resource_limits)
{
if (cfg.cpuCores != 0) {
return cfg.cpuCores;
}
return resource_limits.cpu();
}
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.nextConfigNow();
return 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)) {
LOG_ABORT("should not be reached");
}
}
double measureDiskWriteSpeed(const vespalib::string &path,
size_t diskWriteLen)
{
vespalib::string fileName = path + "/hwinfo-writespeed";
size_t bufferLen = 1_Mi;
Alloc buffer(Alloc::allocMMap(bufferLen));
memset(buffer.get(), 0, buffer.size());
double diskWriteSpeed;
{
FastOS_File testFile;
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();
double elapsed = vespalib::to_s(after - before);
diskWriteSpeed = diskWriteLen / elapsed / 1_Mi;
}
std::filesystem::remove(std::filesystem::path(fileName));
return diskWriteSpeed;
}
}
HwInfoSampler::HwInfoSampler(const vespalib::string &path,
const Config &config)
: _hwInfo(),
_sampleTime(),
_diskWriteSpeed(0.0)
{
setDiskWriteSpeed(path, config);
auto resource_limits = vespalib::ResourceLimits::create();
setup(HwInfo::Disk(sampleDiskSizeBytes(path, config),
(_diskWriteSpeed < config.slowWriteSpeedLimit),
config.diskShared),
HwInfo::Memory(sampleMemorySizeBytes(config, resource_limits)),
HwInfo::Cpu(sampleCpuCores(config, resource_limits)));
}
HwInfoSampler::~HwInfoSampler() = default;
void
HwInfoSampler::setup(const HwInfo::Disk &disk, const HwInfo::Memory &memory, const HwInfo::Cpu &cpu)
{
_hwInfo = HwInfo(disk, memory, cpu);
}
void
HwInfoSampler::setDiskWriteSpeed(const vespalib::string &path, const Config &config)
{
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 {
sampleDiskWriteSpeed(path, config);
}
}
}
void
HwInfoSampler::sampleDiskWriteSpeed(const vespalib::string &path, const Config &config)
{
size_t minDiskWriteLen = 1_Mi;
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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