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#include "balancer.h"
#include <library/cpp/actors/util/datetime.h>
#include <library/cpp/lwtrace/all.h>
#include <library/cpp/testing/unittest/registar.h>
#include <util/stream/str.h>
using namespace NActors;
////////////////////////////////////////////////////////////////////////////////
Y_UNIT_TEST_SUITE(PoolCpuBalancer) {
struct TTest {
TCpuManagerConfig Config;
TCpuMask Available;
THolder<IBalancer> Balancer;
TVector<TCpuState> CpuStates;
TVector<ui64> CpuUs;
ui64 Now = 0;
void SetCpuCount(size_t count) {
Config.UnitedWorkers.CpuCount = count;
for (TCpuId cpuId = 0; cpuId < count; cpuId++) {
Available.Set(cpuId);
}
}
void AddPool(ui32 minCpus, ui32 cpus, ui32 maxCpus, ui8 priority = 0) {
TUnitedExecutorPoolConfig u;
u.PoolId = TPoolId(Config.United.size());
u.Balancing.Cpus = cpus;
u.Balancing.MinCpus = minCpus;
u.Balancing.MaxCpus = maxCpus;
u.Balancing.Priority = priority;
Config.United.push_back(u);
}
void Start() {
TCpuAllocationConfig allocation(Available, Config);
Balancer.Reset(MakeBalancer(Config.UnitedWorkers.Balancer, Config.United, 0));
CpuStates.resize(allocation.Items.size()); // do not resize it later to avoid dangling pointers
CpuUs.resize(CpuStates.size());
for (const TCpuAllocation& cpuAlloc : allocation.Items) {
bool added = Balancer->AddCpu(cpuAlloc, &CpuStates[cpuAlloc.CpuId]);
UNIT_ASSERT(added);
}
}
void Balance(ui64 deltaTs, const TVector<ui64>& cpuUs) {
Now += deltaTs;
ui64 ts = Now;
if (Balancer->TryLock(ts)) {
for (TPoolId pool = 0; pool < cpuUs.size(); pool++) {
CpuUs[pool] += cpuUs[pool];
TBalancerStats stats;
stats.Ts = ts;
stats.CpuUs = CpuUs[pool];
Balancer->SetPoolStats(pool, stats);
}
Balancer->Balance();
Balancer->Unlock();
}
}
void ApplyMovements() {
for (TCpuState& state : CpuStates) {
TPoolId current;
TPoolId assigned;
state.Load(assigned, current);
state.SwitchPool(assigned);
}
}
static TString ToStr(const TVector<ui64>& values) {
TStringStream ss;
ss << "{";
for (auto v : values) {
ss << " " << v;
}
ss << " }";
return ss.Str();
}
void AssertPoolsCurrentCpus(const TVector<ui64>& cpuRequired) {
TVector<ui64> cpuCurrent;
cpuCurrent.resize(cpuRequired.size());
for (TCpuState& state : CpuStates) {
TPoolId current;
TPoolId assigned;
state.Load(assigned, current);
cpuCurrent[current]++;
}
for (TPoolId pool = 0; pool < cpuRequired.size(); pool++) {
UNIT_ASSERT_C(cpuCurrent[pool] == cpuRequired[pool],
"cpu distribution mismatch, required " << ToStr(cpuRequired) << " but got " << ToStr(cpuCurrent));
}
}
};
Y_UNIT_TEST(StartLwtrace) {
NLWTrace::StartLwtraceFromEnv();
}
Y_UNIT_TEST(AllOverloaded) {
TTest t;
int cpus = 10;
t.SetCpuCount(cpus);
t.AddPool(1, 1, 10); // pool=0
t.AddPool(1, 2, 10); // pool=1
t.AddPool(1, 3, 10); // pool=2
t.AddPool(1, 4, 10); // pool=2
t.Start();
ui64 dts = 1.01 * Us2Ts(t.Config.UnitedWorkers.Balancer.PeriodUs);
ui64 totalCpuUs = cpus * Ts2Us(dts); // pretend every pool has consumed as whole actorsystem, overload
for (int i = 0; i < cpus; i++) {
t.Balance(dts, {totalCpuUs, totalCpuUs, totalCpuUs, totalCpuUs});
t.ApplyMovements();
}
t.AssertPoolsCurrentCpus({1, 2, 3, 4});
}
Y_UNIT_TEST(OneOverloaded) {
TTest t;
int cpus = 10;
t.SetCpuCount(cpus);
t.AddPool(1, 1, 10); // pool=0
t.AddPool(1, 2, 10); // pool=1
t.AddPool(1, 3, 10); // pool=2
t.AddPool(1, 4, 10); // pool=2
t.Start();
ui64 dts = 1.01 * Us2Ts(t.Config.UnitedWorkers.Balancer.PeriodUs);
ui64 totalCpuUs = cpus * Ts2Us(dts);
for (int i = 0; i < cpus; i++) {
t.Balance(dts, {totalCpuUs, 0, 0, 0});
t.ApplyMovements();
}
t.AssertPoolsCurrentCpus({7, 1, 1, 1});
for (int i = 0; i < cpus; i++) {
t.Balance(dts, {0, totalCpuUs, 0, 0});
t.ApplyMovements();
}
t.AssertPoolsCurrentCpus({1, 7, 1, 1});
for (int i = 0; i < cpus; i++) {
t.Balance(dts, {0, 0, totalCpuUs, 0});
t.ApplyMovements();
}
t.AssertPoolsCurrentCpus({1, 1, 7, 1});
for (int i = 0; i < cpus; i++) {
t.Balance(dts, {0, 0, 0, totalCpuUs});
t.ApplyMovements();
}
t.AssertPoolsCurrentCpus({1, 1, 1, 7});
}
Y_UNIT_TEST(TwoOverloadedFairness) {
TTest t;
int cpus = 10;
t.SetCpuCount(cpus);
t.AddPool(1, 1, 10); // pool=0
t.AddPool(1, 2, 10); // pool=1
t.AddPool(1, 3, 10); // pool=2
t.AddPool(1, 4, 10); // pool=2
t.Start();
ui64 dts = 1.01 * Us2Ts(t.Config.UnitedWorkers.Balancer.PeriodUs);
ui64 totalCpuUs = cpus * Ts2Us(dts);
for (int i = 0; i < cpus; i++) {
t.Balance(dts, {totalCpuUs, totalCpuUs, 0, 0});
t.ApplyMovements();
}
t.AssertPoolsCurrentCpus({3, 5, 1, 1});
for (int i = 0; i < cpus; i++) {
t.Balance(dts, {totalCpuUs, 0, totalCpuUs, 0});
t.ApplyMovements();
}
t.AssertPoolsCurrentCpus({2, 1, 6, 1});
for (int i = 0; i < cpus; i++) {
t.Balance(dts, {totalCpuUs, 0, 0, totalCpuUs});
t.ApplyMovements();
}
t.AssertPoolsCurrentCpus({2, 1, 1, 6});
for (int i = 0; i < cpus; i++) {
t.Balance(dts, {0, totalCpuUs, totalCpuUs, 0});
t.ApplyMovements();
}
t.AssertPoolsCurrentCpus({1, 3, 5, 1});
for (int i = 0; i < cpus; i++) {
t.Balance(dts, {0, totalCpuUs, 0, totalCpuUs});
t.ApplyMovements();
}
t.AssertPoolsCurrentCpus({1, 3, 1, 5});
for (int i = 0; i < cpus; i++) {
t.Balance(dts, {0, 0, totalCpuUs, totalCpuUs});
t.ApplyMovements();
}
t.AssertPoolsCurrentCpus({1, 1, 3, 5});
}
Y_UNIT_TEST(TwoOverloadedPriority) {
TTest t;
int cpus = 20;
t.SetCpuCount(cpus);
t.AddPool(1, 5, 20, 0); // pool=0
t.AddPool(1, 5, 20, 1); // pool=1
t.AddPool(1, 5, 20, 2); // pool=2
t.AddPool(1, 5, 20, 3); // pool=3
t.Start();
ui64 dts = 1.01 * Us2Ts(t.Config.UnitedWorkers.Balancer.PeriodUs);
ui64 mErlang = Ts2Us(dts) / 1000;
for (int i = 0; i < cpus; i++) {
t.Balance(dts, {20000 * mErlang, 2500 * mErlang, 4500 * mErlang, 9500 * mErlang});
t.ApplyMovements();
}
t.AssertPoolsCurrentCpus({2, 3, 5, 10});
t.Balance(dts, {20000 * mErlang, 2500 * mErlang, 4500 * mErlang, 8500 * mErlang});
t.ApplyMovements();
t.AssertPoolsCurrentCpus({3, 3, 5, 9});
// NOTE: this operation require one move, but we do not make global analysis, so multiple steps (1->2 & 0->1) are required (can be optimized later)
for (int i = 0; i < 3; i++) {
t.Balance(dts, {20000 * mErlang, 2500 * mErlang, 5500 * mErlang, 8500 * mErlang});
t.ApplyMovements();
}
t.AssertPoolsCurrentCpus({2, 3, 6, 9});
}
}
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