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#include "harmonizer.h"
#include "probes.h"
#include "actorsystem.h"
#include <library/cpp/actors/util/cpu_load_log.h>
#include <library/cpp/actors/util/datetime.h>
#include <library/cpp/actors/util/intrinsics.h>
#include <util/system/spinlock.h>
#include <algorithm>
namespace NActors {
LWTRACE_USING(ACTORLIB_PROVIDER);
constexpr bool CheckBinaryPower(ui64 value) {
return !(value & (value - 1));
}
struct TValueHistory {
static constexpr ui64 HistoryBufferSize = 8;
static_assert(CheckBinaryPower(HistoryBufferSize));
double History[HistoryBufferSize] = {0.0};
ui64 HistoryIdx = 0;
ui64 LastTs = Max<ui64>();
double LastUs = 0.0;
double AccumulatedUs = 0.0;
ui64 AccumulatedTs = 0;
template <bool WithTail=false>
double GetAvgPartForLastSeconds(ui8 seconds) {
double sum = AccumulatedUs;
size_t idx = HistoryIdx;
ui8 leftSeconds = seconds;
do {
idx--;
leftSeconds--;
if (idx >= HistoryBufferSize) {
idx = HistoryBufferSize - 1;
}
if (WithTail || leftSeconds) {
sum += History[idx];
} else {
ui64 tsInSecond = Us2Ts(1'000'000.0);
sum += History[idx] * (tsInSecond - AccumulatedTs) / tsInSecond;
}
} while (leftSeconds);
double duration = 1'000'000.0 * seconds + (WithTail ? Ts2Us(AccumulatedTs): 0.0);
double avg = sum / duration;
return avg;
}
double GetAvgPart() {
return GetAvgPartForLastSeconds<true>(HistoryBufferSize);
}
void Register(ui64 ts, double valueUs) {
if (ts < LastTs) {
LastTs = ts;
LastUs = valueUs;
AccumulatedUs = 0.0;
AccumulatedTs = 0;
return;
}
ui64 lastTs = std::exchange(LastTs, ts);
ui64 dTs = ts - lastTs;
double lastUs = std::exchange(LastUs, valueUs);
double dUs = valueUs - lastUs;
LWPROBE(RegisterValue, ts, lastTs, dTs, Us2Ts(8'000'000.0), valueUs, lastUs, dUs);
if (dTs > Us2Ts(8'000'000.0)) {
dUs = dUs * 1'000'000.0 / Ts2Us(dTs);
for (size_t idx = 0; idx < HistoryBufferSize; ++idx) {
History[idx] = dUs;
}
AccumulatedUs = 0.0;
AccumulatedTs = 0;
return;
}
while (dTs > 0) {
if (AccumulatedTs + dTs < Us2Ts(1'000'000.0)) {
AccumulatedTs += dTs;
AccumulatedUs += dUs;
break;
} else {
ui64 addTs = Us2Ts(1'000'000.0) - AccumulatedTs;
double addUs = dUs * addTs / dTs;
dTs -= addTs;
dUs -= addUs;
History[HistoryIdx] = AccumulatedUs + addUs;
HistoryIdx = (HistoryIdx + 1) % HistoryBufferSize;
AccumulatedUs = 0.0;
AccumulatedTs = 0;
}
}
}
};
struct TThreadInfo {
TValueHistory Consumed;
TValueHistory Booked;
};
struct TPoolInfo {
std::vector<TThreadInfo> ThreadInfo;
IExecutorPool* Pool = nullptr;
i16 DefaultThreadCount = 0;
i16 MinThreadCount = 0;
i16 MaxThreadCount = 0;
i16 Priority = 0;
NMonitoring::TDynamicCounters::TCounterPtr AvgPingCounter;
NMonitoring::TDynamicCounters::TCounterPtr AvgPingCounterWithSmallWindow;
ui32 MaxAvgPingUs = 0;
ui64 LastUpdateTs = 0;
bool IsBeingStopped(i16 threadIdx);
double GetBooked(i16 threadIdx);
double GetlastSecondPoolBooked(i16 threadIdx);
double GetConsumed(i16 threadIdx);
double GetlastSecondPoolConsumed(i16 threadIdx);
void PullStats(ui64 ts);
i16 GetThreadCount();
void SetThreadCount(i16 threadCount);
bool IsAvgPingGood();
};
bool TPoolInfo::IsBeingStopped(i16 threadIdx) {
return Pool->IsThreadBeingStopped(threadIdx);
}
double TPoolInfo::GetBooked(i16 threadIdx) {
if ((size_t)threadIdx < ThreadInfo.size()) {
return ThreadInfo[threadIdx].Booked.GetAvgPart();
}
return 0.0;
}
double TPoolInfo::GetlastSecondPoolBooked(i16 threadIdx) {
if ((size_t)threadIdx < ThreadInfo.size()) {
return ThreadInfo[threadIdx].Booked.GetAvgPartForLastSeconds(1);
}
return 0.0;
}
double TPoolInfo::GetConsumed(i16 threadIdx) {
if ((size_t)threadIdx < ThreadInfo.size()) {
return ThreadInfo[threadIdx].Consumed.GetAvgPart();
}
return 0.0;
}
double TPoolInfo::GetlastSecondPoolConsumed(i16 threadIdx) {
if ((size_t)threadIdx < ThreadInfo.size()) {
return ThreadInfo[threadIdx].Consumed.GetAvgPartForLastSeconds(1);
}
return 0.0;
}
#define UNROLL_HISTORY(history) (history)[0], (history)[1], (history)[2], (history)[3], (history)[4], (history)[5], (history)[6], (history)[7]
void TPoolInfo::PullStats(ui64 ts) {
for (i16 threadIdx = 0; threadIdx < MaxThreadCount; ++threadIdx) {
TThreadInfo &threadInfo = ThreadInfo[threadIdx];
threadInfo.Consumed.Register(ts, Pool->GetThreadConsumedUs(threadIdx));
LWPROBE(SavedValues, Pool->PoolId, Pool->GetName(), "consumed", UNROLL_HISTORY(threadInfo.Consumed.History));
threadInfo.Booked.Register(ts, Pool->GetThreadBookedUs(threadIdx));
LWPROBE(SavedValues, Pool->PoolId, Pool->GetName(), "booked", UNROLL_HISTORY(threadInfo.Booked.History));
}
}
#undef UNROLL_HISTORY
i16 TPoolInfo::GetThreadCount() {
return Pool->GetThreadCount();
}
void TPoolInfo::SetThreadCount(i16 threadCount) {
Pool->SetThreadCount(threadCount);
}
bool TPoolInfo::IsAvgPingGood() {
bool res = true;
if (AvgPingCounter) {
res &= *AvgPingCounter > MaxAvgPingUs;
}
if (AvgPingCounterWithSmallWindow) {
res &= *AvgPingCounterWithSmallWindow > MaxAvgPingUs;
}
return res;
}
class THarmonizer: public IHarmonizer {
private:
std::atomic<bool> IsDisabled = false;
TSpinLock Lock;
std::atomic<ui64> NextHarmonizeTs = 0;
std::vector<TPoolInfo> Pools;
std::vector<ui16> PriorityOrder;
void PullStats(ui64 ts);
void HarmonizeImpl(ui64 ts);
void CalculatePriorityOrder();
public:
THarmonizer(ui64 ts);
virtual ~THarmonizer();
double Rescale(double value) const;
void Harmonize(ui64 ts) override;
void DeclareEmergency(ui64 ts) override;
void AddPool(IExecutorPool* pool, TSelfPingInfo *pingInfo) override;
void Enable(bool enable) override;
};
THarmonizer::THarmonizer(ui64 ts) {
NextHarmonizeTs = ts;
}
THarmonizer::~THarmonizer() {
}
double THarmonizer::Rescale(double value) const {
return Max(0.0, Min(1.0, value * (1.0/0.9)));
}
void THarmonizer::PullStats(ui64 ts) {
for (TPoolInfo &pool : Pools) {
pool.PullStats(ts);
}
}
Y_FORCE_INLINE bool IsStarved(double consumed, double booked) {
return Max(consumed, booked) > 0.1 && consumed < booked * 0.7;
}
Y_FORCE_INLINE bool IsHoggish(double booked, ui16 currentThreadCount) {
return booked < currentThreadCount - 1;
}
void THarmonizer::HarmonizeImpl(ui64 ts) {
bool isStarvedPresent = false;
double booked = 0.0;
double consumed = 0.0;
double lastSecondBooked = 0.0;
i64 beingStopped = 0;
i64 total = 0;
TStackVec<size_t, 8> needyPools;
TStackVec<size_t, 8> hoggishPools;
for (size_t poolIdx = 0; poolIdx < Pools.size(); ++poolIdx) {
TPoolInfo& pool = Pools[poolIdx];
total += pool.DefaultThreadCount;
double poolBooked = 0.0;
double poolConsumed = 0.0;
double lastSecondPoolBooked = 0.0;
double lastSecondPoolConsumed = 0.0;
beingStopped += pool.Pool->GetBlockingThreadCount();
for (i16 threadIdx = 0; threadIdx < pool.MaxThreadCount; ++threadIdx) {
poolBooked += Rescale(pool.GetBooked(threadIdx));
lastSecondPoolBooked += Rescale(pool.GetlastSecondPoolBooked(threadIdx));
poolConsumed += Rescale(pool.GetConsumed(threadIdx));
lastSecondPoolConsumed += Rescale(pool.GetlastSecondPoolConsumed(threadIdx));
}
bool isStarved = IsStarved(consumed, booked) || IsStarved(lastSecondPoolConsumed, lastSecondPoolBooked);
if (isStarved) {
isStarvedPresent = true;
}
ui32 currentThreadCount = pool.GetThreadCount();
bool isNeedy = pool.IsAvgPingGood() && poolBooked >= currentThreadCount;
if (pool.AvgPingCounter) {
if (pool.LastUpdateTs + Us2Ts(3'000'000ull) > ts) {
isNeedy = false;
} else {
pool.LastUpdateTs = ts;
}
}
if (isNeedy) {
needyPools.push_back(poolIdx);
}
bool isHoggish = IsHoggish(poolBooked, currentThreadCount)
|| IsHoggish(lastSecondPoolBooked, currentThreadCount);
if (isHoggish) {
hoggishPools.push_back(poolIdx);
}
booked += poolBooked;
consumed += poolConsumed;
LWPROBE(HarmonizeCheckPool, poolIdx, pool.Pool->GetName(), poolBooked, poolConsumed, lastSecondPoolBooked, lastSecondPoolConsumed, pool.GetThreadCount(), pool.MaxThreadCount, isStarved, isNeedy, isHoggish);
}
double budget = total - Max(booked, lastSecondBooked);
if (budget < -0.1) {
isStarvedPresent = true;
}
double overbooked = consumed - booked;
if (isStarvedPresent) {
// last_starved_at_consumed_value = сумма по всем пулам consumed;
// TODO(cthulhu): использовать как лимит планвно устремлять этот лимит к total,
// использовать вместо total
if (beingStopped && beingStopped >= overbooked) {
// do nothing
} else {
TStackVec<size_t> reorder;
for (size_t i = 0; i < Pools.size(); ++i) {
reorder.push_back(i);
}
for (ui16 poolIdx : PriorityOrder) {
TPoolInfo &pool = Pools[poolIdx];
i64 threadCount = pool.GetThreadCount();
if (threadCount > pool.DefaultThreadCount) {
pool.SetThreadCount(threadCount - 1);
overbooked--;
LWPROBE(HarmonizeOperation, poolIdx, pool.Pool->GetName(), "decrease", threadCount - 1, pool.DefaultThreadCount, pool.MaxThreadCount);
if (overbooked < 1) {
break;
}
}
}
}
} else {
for (size_t needyPoolIdx : needyPools) {
TPoolInfo &pool = Pools[needyPoolIdx];
if (budget >= 1.0) {
i64 threadCount = pool.GetThreadCount();
if (threadCount + 1 <= pool.MaxThreadCount) {
pool.SetThreadCount(threadCount + 1);
budget -= 1.0;
LWPROBE(HarmonizeOperation, needyPoolIdx, pool.Pool->GetName(), "increase", threadCount + 1, pool.DefaultThreadCount, pool.MaxThreadCount);
}
}
}
}
for (size_t hoggishPoolIdx : hoggishPools) {
TPoolInfo &pool = Pools[hoggishPoolIdx];
i64 threadCount = pool.GetThreadCount();
if (threadCount > pool.MinThreadCount) {
LWPROBE(HarmonizeOperation, hoggishPoolIdx, pool.Pool->GetName(), "decrease", threadCount - 1, pool.DefaultThreadCount, pool.MaxThreadCount);
pool.SetThreadCount(threadCount - 1);
}
}
}
void THarmonizer::CalculatePriorityOrder() {
PriorityOrder.resize(Pools.size());
Iota(PriorityOrder.begin(), PriorityOrder.end(), 0);
Sort(PriorityOrder.begin(), PriorityOrder.end(), [&] (i16 lhs, i16 rhs) {
if (Pools[lhs].Priority != Pools[rhs].Priority) {
return Pools[lhs].Priority < Pools[rhs].Priority;
}
return Pools[lhs].Pool->PoolId > Pools[rhs].Pool->PoolId;
});
}
void THarmonizer::Harmonize(ui64 ts) {
if (IsDisabled || NextHarmonizeTs > ts || !Lock.TryAcquire()) {
LWPROBE(TryToHarmonizeFailed, ts, NextHarmonizeTs, IsDisabled, false);
return;
}
// Check again under the lock
if (IsDisabled) {
LWPROBE(TryToHarmonizeFailed, ts, NextHarmonizeTs, IsDisabled, true);
Lock.Release();
return;
}
// Will never reach this line disabled
ui64 previousNextHarmonizeTs = NextHarmonizeTs.exchange(ts + Us2Ts(1'000'000ull));
LWPROBE(TryToHarmonizeSuccess, ts, NextHarmonizeTs, previousNextHarmonizeTs);
if (PriorityOrder.empty()) {
CalculatePriorityOrder();
}
PullStats(ts);
HarmonizeImpl(ts);
Lock.Release();
}
void THarmonizer::DeclareEmergency(ui64 ts) {
NextHarmonizeTs = ts;
}
void THarmonizer::AddPool(IExecutorPool* pool, TSelfPingInfo *pingInfo) {
TGuard<TSpinLock> guard(Lock);
TPoolInfo poolInfo;
poolInfo.Pool = pool;
poolInfo.DefaultThreadCount = pool->GetDefaultThreadCount();
poolInfo.MinThreadCount = pool->GetMinThreadCount();
poolInfo.MaxThreadCount = pool->GetMaxThreadCount();
poolInfo.ThreadInfo.resize(poolInfo.MaxThreadCount);
poolInfo.Priority = pool->GetPriority();
pool->SetThreadCount(poolInfo.DefaultThreadCount);
if (pingInfo) {
poolInfo.AvgPingCounter = pingInfo->AvgPingCounter;
poolInfo.AvgPingCounterWithSmallWindow = pingInfo->AvgPingCounterWithSmallWindow;
poolInfo.MaxAvgPingUs = pingInfo->MaxAvgPingUs;
}
Pools.push_back(poolInfo);
PriorityOrder.clear();
};
void THarmonizer::Enable(bool enable) {
TGuard<TSpinLock> guard(Lock);
IsDisabled = enable;
}
IHarmonizer* MakeHarmonizer(ui64 ts) {
return new THarmonizer(ts);
}
}
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