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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "shared_threading_service_config.h"
#include <vespa/config-proton.h>
#include <cmath>
namespace proton {
using ProtonConfig = SharedThreadingServiceConfig::ProtonConfig;
SharedThreadingServiceConfig::SharedThreadingServiceConfig(uint32_t shared_threads_in,
uint32_t shared_task_limit_in,
uint32_t field_writer_threads_in,
double feeding_niceness_in,
const ThreadingServiceConfig& field_writer_config_in)
: _shared_threads(shared_threads_in),
_shared_task_limit(shared_task_limit_in),
_field_writer_threads(field_writer_threads_in),
_feeding_niceness(feeding_niceness_in),
_field_writer_config(field_writer_config_in)
{
}
namespace {
uint32_t
derive_shared_threads(const ProtonConfig& cfg, const vespalib::HwInfo::Cpu& cpu_info)
{
auto scaled_cores = uint32_t(std::ceil(cpu_info.cores() * cfg.feeding.concurrency));
// We need at least 1 guaranteed free worker in order to ensure progress.
return std::max(scaled_cores, uint32_t(cfg.flush.maxconcurrent + 1u));
}
uint32_t
derive_field_writer_threads(const ProtonConfig& cfg, const vespalib::HwInfo::Cpu& cpu_info)
{
uint32_t scaled_cores = size_t(std::ceil(cpu_info.cores() * cfg.feeding.concurrency));
uint32_t field_writer_threads = std::max(scaled_cores, uint32_t(cfg.indexing.threads));
// Originally we used at least 3 threads for writing fields:
// - index field inverter
// - index field writer
// - attribute field writer
// We keep the same lower bound for similar behavior when using the shared field writer.
return std::max(field_writer_threads, 3u);
}
}
SharedThreadingServiceConfig
SharedThreadingServiceConfig::make(const proton::SharedThreadingServiceConfig::ProtonConfig& cfg,
const vespalib::HwInfo::Cpu& cpu_info)
{
uint32_t shared_threads = derive_shared_threads(cfg, cpu_info);
uint32_t field_writer_threads = derive_field_writer_threads(cfg, cpu_info);
return {shared_threads, shared_threads * 16, field_writer_threads,
cfg.feeding.niceness, ThreadingServiceConfig::make(cfg)};
}
}
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