557 lines
25 KiB
C++
557 lines
25 KiB
C++
/*
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BlockFlow(Test) - verify scheduler memory management scheme
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Copyright (C) Lumiera.org
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2023, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file block-flow-test.cpp
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** unit test \ref BlockFlow_test
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*/
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#include "lib/test/run.hpp"
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#include "lib/test/test-helper.hpp"
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#include "vault/gear/block-flow.hpp"
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//#include "lib/time/timevalue.hpp"
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//#include "lib/format-cout.hpp"
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#include "lib/test/diagnostic-output.hpp" ////////////////////////////////TODO
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#include "lib/meta/function.hpp"
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#include "lib/util.hpp"
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//#include <utility>
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#include <chrono>
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#include <vector>
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#include <tuple>
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using test::Test;
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//using std::move;
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using util::isSameObject;
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using lib::test::randTime;
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using lib::test::showType;
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using lib::time::Offset;
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using std::vector;
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using std::pair;
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using std::reference_wrapper;
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namespace vault{
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namespace gear {
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namespace test {
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// using lib::time::FrameRate;
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// using lib::time::Time;
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namespace {
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using BlockFlow = gear::BlockFlow<>;
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using Extent = BlockFlow::Extent;
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using Epoch = BlockFlow::Epoch;
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const size_t EXTENT_SIZ = Extent::SIZ();
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}
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/*****************************************************************//**
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* @test document the memory management scheme used by the Scheduler.
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* @see SchedulerActivity_test
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* @see SchedulerUsage_test
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*/
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class BlockFlow_test : public Test
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{
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virtual void
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run (Arg)
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{
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simpleUsage();
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handleEpoch();
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placeActivity();
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adjustEpochs();
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storageFlow();
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}
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/** @test demonstrate a simple usage scenario
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* - open new Epoch to allocate an Activity
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* - clean-up at a future time point
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*/
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void
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simpleUsage()
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{
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BlockFlow bFlow;
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Time deadline = randTime();
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Activity& tick = bFlow.until(deadline).create();
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CHECK (tick.verb_ == Activity::TICK);
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CHECK (1 == watch(bFlow).cntEpochs());
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CHECK (watch(bFlow).first() > deadline);
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CHECK (watch(bFlow).first() - deadline == bFlow.getEpochStep());
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bFlow.discardBefore (deadline + Time{0,5});
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CHECK (0 == watch(bFlow).cntEpochs());
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}
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/** @test cover properties and handling of Epochs (low-level)
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* - demonstrate that Epoch is placed into an Extent
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* - verify that both Extent and Epoch access the same memory block
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* - demonstrate the standard setup and initialisation of an Epoch
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* - allocate some Activities into the storage and observe free-managment
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* - detect when the Epoch is filled up
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* - verify alive / dead decision relative to given deadline
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* @note this test covers helpers and implementation structures of BlockFlow,
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* without actually using a BlockFlow instance; rather, the typical handling
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* and low-level bookkeeping aspects are emulated and observed
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*/
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void
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handleEpoch()
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{
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// the raw storage Extent is a compact block
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// providing uninitialised storage typed as `vault::gear::Activity`
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Allocator alloc;
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alloc.openNew();
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Extent& extent = *alloc.begin();
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CHECK (extent.size() == Extent::SIZ::value);
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CHECK (sizeof(extent) == extent.size() * sizeof(Activity));
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CHECK (showType<Extent::value_type>() == "vault::gear::Activity"_expect);
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// we can just access some slot and place data there
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extent[55].data_.feed.one = 555555555555555;
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// now establish an Epoch in this storage block:
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Epoch& epoch = Epoch::setup (alloc.begin(), Time{0,10});
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// the underlying storage is not touched yet...
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CHECK (epoch[55].data_.feed.one == 555555555555555);
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// but in the first slot, an »EpochGate« has been implanted
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Epoch::EpochGate& gate = epoch.gate();
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CHECK (isSameObject (gate, epoch[0]));
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CHECK (isSameObject (epoch[0], extent[0]));
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CHECK (Time{gate.deadline()} == Time(0,10));
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CHECK (Time{gate.deadline()} == Time{epoch[0].data_.condition.dead});
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CHECK (Activity::GATE == epoch[0].verb_);
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// the gate's `next`-pointer is (ab)used to manage the next allocation slot
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CHECK (isSameObject (*gate.next, epoch[extent.size()-1]));
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CHECK (0 == gate.filledSlots());
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CHECK (0 == epoch.getFillFactor());
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// the storage there is not yet used, but will be overwritten by the ctor call
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epoch[extent.size()-1].data_.timing.instant = Time{5,5};
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// allocate a new Activity into the next free slot (using a faked AllocatorHandle)
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BlockFlow::AllocatorHandle allocHandle{alloc.begin(), nullptr};
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Activity& timeStart = allocHandle.create (Activity::TIMESTART);
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CHECK (isSameObject (timeStart, epoch[extent.size()-1]));
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// this Activity object is properly initialised (and memory was altered)
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CHECK (epoch[extent.size()-1].data_.timing.instant != Time(5,5));
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CHECK (epoch[extent.size()-1].data_.timing.instant == Time::NEVER);
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CHECK (timeStart.verb_ == Activity::TIMESTART);
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CHECK (timeStart.data_.timing.instant == Time::NEVER);
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CHECK (timeStart.data_.timing.quality == 0);
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// and the free-pointer was decremented to point to the next free slot
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CHECK (isSameObject (*gate.next, epoch[extent.size()-2]));
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// which also implies that there is still ample space left...
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CHECK (1 == gate.filledSlots());
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CHECK (gate.hasFreeSlot());
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CHECK (epoch.getFillFactor() == double(gate.filledSlots()) / (EXTENT_SIZ-1));
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// so let's eat this space up...
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for (uint i=extent.size()-2; i>1; --i)
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gate.claimNextSlot();
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// one final slot is left (beyond of the EpochGate itself)
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CHECK (isSameObject (*gate.next, epoch[1]));
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CHECK (gate.filledSlots() == EXTENT_SIZ-2);
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CHECK (gate.hasFreeSlot());
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gate.claimNextSlot();
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// aaand the boat is full...
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CHECK (not gate.hasFreeSlot());
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CHECK (isSameObject (*gate.next, epoch[0]));
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CHECK (gate.filledSlots() == EXTENT_SIZ-1);
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CHECK (epoch.getFillFactor() == 1);
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// a given Epoch can be checked for relevance against a deadline
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CHECK (gate.deadline() == Time(0,10));
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CHECK ( gate.isAlive (Time(0,5)));
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CHECK ( gate.isAlive (Time(999,9)));
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CHECK (not gate.isAlive (Time(0,10)));
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CHECK (not gate.isAlive (Time(1,10)));
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////////////////////////////////////////////////////////////////////////////////////////TICKET #1298 : actually use a GATE implementation and then also check the count-down latch
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}
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/** @test place Activity record into storage
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* - new Activity without any previously established Epoch
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* - place Activity into future, expanding the Epoch grid
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* - locate Activity relative to established Epoch grid
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* - fill up existing Epoch, causing overflow to next one
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* - exhaust multiple adjacent Epochs, overflowing to first free one
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* - exhaust last Epoch, causing setup of new Epoch, with reduced spacing
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* - use this reduced spacing also for subsequently created Epochs
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* - clean up obsoleted Epochs, based on given deadline
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* @todo WIP 7/23 ⟶ ✔define ⟶ ✔implement
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*/
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void
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placeActivity()
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{
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BlockFlow bFlow;
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Time t1 = Time{ 0,10};
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Time t2 = Time{500,10};
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Time t3 = Time{ 0,11};
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// no Epoch established yet...
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auto& a1 = bFlow.until(t1).create();
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CHECK (watch(bFlow).allEpochs() == "10s200ms"_expect);
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CHECK (watch(bFlow).find(a1) == "10s200ms"_expect);
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// setup Epoch grid into the future
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auto& a3 = bFlow.until(t3).create();
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CHECK (watch(bFlow).allEpochs() == "10s200ms|10s400ms|10s600ms|10s800ms|11s"_expect);
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CHECK (watch(bFlow).find(a3) == "11s"_expect);
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// associate to existing Epoch
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auto& a2 = bFlow.until(t2).create();
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CHECK (watch(bFlow).allEpochs() == "10s200ms|10s400ms|10s600ms|10s800ms|11s"_expect);
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CHECK (watch(bFlow).find(a2) == "10s600ms"_expect);
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Time t0 = Time{0,5};
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// late(past) Activity is placed in the oldest Epoch alive
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auto& a0 = bFlow.until(t0).create();
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CHECK (watch(bFlow).allEpochs() == "10s200ms|10s400ms|10s600ms|10s800ms|11s"_expect);
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CHECK (watch(bFlow).find(a0) == "10s200ms"_expect);
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// provoke Epoch overflow by exhausting all available storage slots
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BlockFlow::AllocatorHandle allocHandle = bFlow.until(Time{300,10});
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for (uint i=1; i<EXTENT_SIZ; ++i)
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allocHandle.create();
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CHECK (allocHandle.currDeadline() == Time(400,10));
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CHECK (not allocHandle.hasFreeSlot());
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// ...causing next allocation to be shifted into subsequent Epoch
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auto& a4 = allocHandle.create();
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CHECK (allocHandle.currDeadline() == Time(600,10));
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CHECK (allocHandle.hasFreeSlot());
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CHECK (watch(bFlow).find(a4) == "10s600ms"_expect);
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// fill up and exhaust this Epoch too....
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for (uint i=1; i<EXTENT_SIZ; ++i)
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allocHandle.create();
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// so the handle has moved to the after next Epoch
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CHECK (allocHandle.currDeadline() == Time(800,10));
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CHECK (allocHandle.hasFreeSlot());
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// even allocation with way earlier deadline is shifted here now
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auto& a5 = bFlow.until(Time{220,10}).create();
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CHECK (watch(bFlow).find(a5) == "10s800ms"_expect);
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// now repeat the same pattern, but now towards uncharted Epochs
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allocHandle = bFlow.until(Time{900,10});
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for (uint i=2; i<EXTENT_SIZ; ++i)
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allocHandle.create();
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CHECK (allocHandle.currDeadline() == Time(0,11));
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CHECK (not allocHandle.hasFreeSlot());
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auto& a6 = bFlow.until(Time{850,10}).create();
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// Note: encountered four overflow-Events, leading to decreased Epoch spacing for new Epochs
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CHECK (watch(bFlow).find(a6) == "11s193ms"_expect);
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CHECK (watch(bFlow).allEpochs() == "10s200ms|10s400ms|10s600ms|10s800ms|11s|11s193ms"_expect);
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auto& a7 = bFlow.until(Time{500,11}).create();
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// this allocation does not count as overflow, but has to expand the Epoch grid, now using the reduced Epoch spacing
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CHECK (watch(bFlow).allEpochs() == "10s200ms|10s400ms|10s600ms|10s800ms|11s|11s193ms|11s387ms|11s580ms"_expect);
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CHECK (watch(bFlow).find(a7) == "11s580ms"_expect);
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// on clean-up, actual fill ratio is used to adjust to optimise Epoch length for better space usage
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CHECK (bFlow.getEpochStep() == "≺193ms≻"_expect);
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bFlow.discardBefore (Time{999,10});
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CHECK (bFlow.getEpochStep() == "≺234ms≻"_expect);
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CHECK (watch(bFlow).allEpochs() == "11s|11s193ms|11s387ms|11s580ms"_expect);
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// placed into the oldest Epoch still alive
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auto& a8 = bFlow.until(Time{500,10}).create();
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CHECK (watch(bFlow).find(a8) == "11s193ms"_expect);
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}
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/** @test load based regulation of Epoch spacing
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* - on overflow, capacity is boosted by a fixed factor
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* - on clean-up, a moving average of (in hindsight) optimal length is
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* computed and used as the new Epoch spacing
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* @todo WIP 7/23 ⟶ ✔define ⟶ 🔁implement
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*/
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void
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adjustEpochs()
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{
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BlockFlow bFlow;
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CHECK (bFlow.getEpochStep() == INITIAL_EPOCH_STEP);
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// whenever an Epoch overflow happens, capacity is boosted by reducing the Epoch duration
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SHOW_EXPR(bFlow.getEpochStep())
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bFlow.markEpochOverflow();
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SHOW_EXPR(bFlow.getEpochStep())
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SHOW_EXPR(INITIAL_EPOCH_STEP)
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SHOW_EXPR(INITIAL_EPOCH_STEP*BOOST_OVERFLOW)
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CHECK (bFlow.getEpochStep() == INITIAL_EPOCH_STEP * BOOST_OVERFLOW);
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bFlow.markEpochOverflow();
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CHECK (bFlow.getEpochStep() == INITIAL_EPOCH_STEP * BOOST_OVERFLOW*BOOST_OVERFLOW);
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// To counteract this increase, on clean-up the actual fill rate of the Extent
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// serves to guess an optimal Epoch duration, which is averaged exponentially
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// Using just arbitrary demo values for some fictional Epochs
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TimeVar dur1 = INITIAL_EPOCH_STEP;
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double fac1 = 0.8;
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TimeVar dur2 = INITIAL_EPOCH_STEP * BOOST_OVERFLOW;
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double fac2 = 0.3;
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double goal1 = double(_raw(dur1)) / (fac1/TARGET_FILL);
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double goal2 = double(_raw(dur2)) / (fac2/TARGET_FILL);
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auto movingAverage = [&](TimeValue old, double contribution)
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{
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auto N = AVERAGE_EPOCHS;
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auto averageTicks = double(_raw(old))*(N-1)/N + contribution/N;
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return TimeValue{gavl_time_t (floor (averageTicks))};
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};
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TimeVar step = bFlow.getEpochStep();
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SHOW_EXPR(bFlow.getEpochStep())
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bFlow.markEpochUnderflow (dur1, fac1);
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SHOW_EXPR(bFlow.getEpochStep())
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SHOW_EXPR(fac1/TARGET_FILL)
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SHOW_EXPR(goal1)
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SHOW_EXPR(movingAverage(step, goal1))
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CHECK (bFlow.getEpochStep() == movingAverage(step, goal1));
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step = bFlow.getEpochStep();
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bFlow.markEpochUnderflow (dur2, fac2);
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SHOW_EXPR(_raw(bFlow.getEpochStep()))
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SHOW_EXPR(_raw(movingAverage(step, goal2)))
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CHECK (bFlow.getEpochStep() == movingAverage(step, goal2));
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}
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/** @test investigate progression of epochs under realistic load
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* - expose the allocator to a load of 200fps for simulated 60sec
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* - assuming 10 Activities per frame, this means a throughput of 120000 Activities
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* - run this load exposure under saturation for performance measurement
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* - use a planning to deadline delay of 500ms, but with ±200ms random spread
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* - after 250ms (500 steps), »invoke« by accessing and adding the random checksum
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* - run a comparison of all-pre-allocated ⟷ heap allocated ⟷ Refcount ⟷ BlockFlow
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* @todo WIP 7/23 ⟶ 🔁define ⟶ 🔁implement
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*/
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void
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storageFlow()
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{
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const uint INSTANCES = 120000; // Activities to send through the test subject
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const uint MAX_TIME = 121000; // Test steps to perform
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const gavl_time_t STP = 500; // with 2 steps per ms
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Offset BASE_DEADLINE{FSecs{1,2}}; // base pre-roll before deadline
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Offset SPREAD_DEAD{FSecs{2,100}}; // random spread of deadline around base
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const uint INVOKE_LAG = 500; // „invoke“ the Activity after 500 steps (≙ simulated 250ms)
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const uint CLEAN_UP = 200; // perform clean-up every 200 steps
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using TestData = vector<pair<TimeVar, size_t>>;
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using Subjects = vector<reference_wrapper<Activity>>;
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// pre-generate random test data
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TestData testData{INSTANCES};
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for (size_t i=0; i<INSTANCES; ++i)
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{
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const size_t SPREAD = 2*_raw(SPREAD_DEAD);
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const size_t MIN_DEAD = _raw(BASE_DEADLINE) - _raw(SPREAD_DEAD);
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auto&[t,r] = testData[i];
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r = rand() % SPREAD;
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t = TimeValue(i*STP + MIN_DEAD + r);
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}
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Activity dummy; // reserve memory for test subject index
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Subjects subject{INSTANCES, std::ref(dummy)};
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auto runTest = [&](auto allocate, auto invoke) -> size_t
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{
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// allocate Activity record for deadline and with given random payload
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ASSERT_VALID_SIGNATURE (decltype(allocate), Activity&(Time, size_t));
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// access the given Activity, read the payload, then trigger disposal
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ASSERT_VALID_SIGNATURE (decltype(invoke), size_t(Activity&));
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size_t checksum{0};
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for (size_t i=0; i<MAX_TIME; ++i)
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{
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if (i < INSTANCES)
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{
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auto const& data = testData[i];
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subject[i] = allocate(data.first, data.second);
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}
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if (INVOKE_LAG <= i and i-INVOKE_LAG < INSTANCES)
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checksum += invoke(subject[i-INVOKE_LAG]);
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}
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return checksum;
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};
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auto benchmark = [INSTANCES](auto invokeTest)
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{
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using std::chrono::system_clock;
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using Dur = std::chrono::duration<double>;
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const double SCALE = 1e9; // Results are in ns
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auto start = system_clock::now();
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invokeTest();
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Dur duration = system_clock::now () - start;
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return duration.count()/(INSTANCES) * SCALE;
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};
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/* =========== Test-Setup-1: no individual allocations/deallocations ========== */
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size_t sum1{0};
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vector<Activity> storage{INSTANCES};
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auto noAlloc = [&]{ // use pre-allocated storage block
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auto allocate = [i=0, &storage](Time, size_t check) mutable -> Activity&
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{
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return *new(&storage[i++]) Activity{check, size_t{55}};
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};
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auto invoke = [](Activity& feedActivity)
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{
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return feedActivity.data_.feed.one;
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};
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sum1 = runTest (allocate, invoke);
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};
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/* =========== Test-Setup-2: individual heap allocations ========== */
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size_t sum2{0};
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auto heapAlloc = [&]{
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auto allocate = [](Time, size_t check) mutable -> Activity&
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{
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return *new Activity{check, size_t{55}};
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};
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auto invoke = [](Activity& feedActivity)
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{
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size_t check = feedActivity.data_.feed.one;
|
|
delete &feedActivity;
|
|
return check;
|
|
};
|
|
|
|
sum2 = runTest (allocate, invoke);
|
|
};
|
|
|
|
|
|
/* =========== Test-Setup-3: manage individually by ref-cnt ========== */
|
|
size_t sum3{0};
|
|
vector<std::shared_ptr<Activity>> manager{INSTANCES};
|
|
auto sharedAlloc = [&]{
|
|
auto allocate = [&, i=0](Time, size_t check) mutable -> Activity&
|
|
{
|
|
Activity* a = new Activity{check, size_t{55}};
|
|
manager[i].reset(a);
|
|
++i;
|
|
return *a;
|
|
};
|
|
auto invoke = [&, i=0](Activity& feedActivity) mutable
|
|
{
|
|
size_t check = feedActivity.data_.feed.one;
|
|
manager[i].reset();
|
|
return check;
|
|
};
|
|
|
|
sum3 = runTest (allocate, invoke);
|
|
};
|
|
|
|
|
|
/* =========== Test-Setup-4: use BlockFlow allocation scheme ========== */
|
|
size_t sum4{0};
|
|
auto blockFlow = [&]{
|
|
BlockFlow blockFlow;
|
|
BlockFlow::AllocatorHandle allocHandle = blockFlow.until(Time{400,0});
|
|
auto allocate = [&, j=0](Time t, size_t check) mutable -> Activity&
|
|
{
|
|
if (++j >= 10) // typically several Activities are allocated on the same deadline
|
|
{
|
|
allocHandle = blockFlow.until(t);
|
|
j = 0;
|
|
}
|
|
return allocHandle.create (check, size_t{55});
|
|
};
|
|
auto invoke = [&, i=0](Activity& feedActivity) mutable
|
|
{
|
|
size_t check = feedActivity.data_.feed.one;
|
|
if (i % CLEAN_UP == 0)
|
|
blockFlow.discardBefore (Time{TimeValue{i*STP}});
|
|
++i;
|
|
return check;
|
|
};
|
|
|
|
sum4 = runTest (allocate, invoke);
|
|
SHOW_EXPR(watch(blockFlow).cntEpochs())
|
|
SHOW_EXPR(watch(blockFlow).poolSize())
|
|
SHOW_EXPR(watch(blockFlow).first())
|
|
SHOW_EXPR(watch(blockFlow).last())
|
|
SHOW_EXPR(_raw(blockFlow.getEpochStep()))
|
|
//SHOW_EXPR(watch(blockFlow).allEpochs())
|
|
};
|
|
|
|
// INVOKE Setup-1
|
|
auto time_noAlloc = benchmark(noAlloc);
|
|
SHOW_EXPR(time_noAlloc)
|
|
SHOW_EXPR(sum1);
|
|
|
|
// INVOKE Setup-2
|
|
auto time_heapAlloc = benchmark(heapAlloc);
|
|
SHOW_EXPR(time_heapAlloc)
|
|
SHOW_EXPR(sum2);
|
|
|
|
// INVOKE Setup-3
|
|
auto time_sharedAlloc = benchmark(sharedAlloc);
|
|
SHOW_EXPR(time_sharedAlloc)
|
|
SHOW_EXPR(sum3);
|
|
|
|
cout<<"\n\n■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□■□"<<endl;
|
|
// INVOKE Setup-4
|
|
auto time_blockFlow = benchmark(blockFlow);
|
|
SHOW_EXPR(time_blockFlow)
|
|
SHOW_EXPR(sum4);
|
|
}
|
|
};
|
|
|
|
|
|
/** Register this test class... */
|
|
LAUNCHER (BlockFlow_test, "unit engine");
|
|
|
|
|
|
|
|
}}} // namespace vault::gear::test
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