use cv in thread, move barrier to blt
Brett
parent
f7f63f6f84
commit
5b6924574a
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@ -1,5 +1,5 @@
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cmake_minimum_required(VERSION 3.25)
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project(blt-gp VERSION 0.0.75)
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project(blt-gp VERSION 0.0.76)
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include(CTest)
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@ -41,6 +41,7 @@
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#include <blt/std/types.h>
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#include <blt/std/utility.h>
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#include <blt/std/memory.h>
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#include <blt/std/thread.h>
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#include <blt/gp/fwdecl.h>
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#include <blt/gp/typesystem.h>
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#include <blt/gp/operations.h>
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@ -54,79 +55,6 @@
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namespace blt::gp
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{
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namespace detail
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{
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// Author: Kirk Saunders (ks825016@ohio.edu)
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// Description: Simple implementation of a thread barrier
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// using C++ condition variables.
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// Date: 2/17/2020
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// https://github.com/kirksaunders/barrier/blob/master/barrier.hpp
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class barrier
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{
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public:
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// Construct barrier for use with num threads.
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explicit barrier(std::atomic_bool& exit_cond, std::size_t num)
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: num_threads(num),
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wait_count(0),
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instance(0),
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mut(),
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cv(),
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exit_cond(exit_cond)
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{
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if (num == 0)
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{
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throw std::invalid_argument("Barrier thread count cannot be 0");
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}
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}
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// disable copying of barrier
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barrier(const barrier&) = delete;
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barrier& operator=(const barrier&) = delete;
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// This function blocks the calling thread until
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// all threads (specified by num_threads) have
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// called it. Blocking is achieved using a
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// call to condition_variable.wait().
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void wait()
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{
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std::unique_lock<std::mutex> lock(mut); // acquire lock
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std::size_t inst = instance; // store current instance for comparison
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// in predicate
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if (++wait_count == num_threads)
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{ // all threads reached barrier
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wait_count = 0; // reset wait_count
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instance++; // increment instance for next use of barrier and to
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// pass condition variable predicate
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cv.notify_all();
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} else
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{ // not all threads have reached barrier
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cv.wait(lock, [this, &inst]() { return (instance != inst || exit_cond); });
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// NOTE: The predicate lambda here protects against spurious
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// wakeups of the thread. As long as this->instance is
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// equal to inst, the thread will not wake.
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// this->instance will only increment when all threads
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// have reached the barrier and are ready to be unblocked.
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}
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}
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void notify_all()
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{
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cv.notify_all();
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}
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private:
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std::size_t num_threads; // number of threads using barrier
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std::size_t wait_count; // counter to keep track of waiting threads
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std::size_t instance; // counter to keep track of barrier use count
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std::mutex mut; // mutex used to protect resources
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std::condition_variable cv; // condition variable used to block threads
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std::atomic_bool& exit_cond; // used to signal we should exit
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};
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}
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struct argc_t
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{
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blt::u32 argc = 0;
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@ -420,6 +348,7 @@ namespace blt::gp
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}
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thread_helper.barrier.wait();
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});
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thread_helper.thread_function_condition.notify_all();
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}
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evaluate_fitness_internal();
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}
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@ -585,13 +514,16 @@ namespace blt::gp
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struct concurrency_storage
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{
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std::vector<std::unique_ptr<std::thread>> threads;
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std::mutex thread_function_control;
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std::condition_variable thread_function_condition {};
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std::atomic_uint64_t evaluation_left = 0;
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std::atomic_bool lifetime_over = false;
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detail::barrier barrier;
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blt::barrier barrier;
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explicit concurrency_storage(blt::size_t threads): barrier(lifetime_over, threads)
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explicit concurrency_storage(blt::size_t threads): barrier(threads, lifetime_over)
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{}
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} thread_helper{config.threads};
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@ -75,10 +75,7 @@ namespace blt::gp
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}
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for (blt::size_t i = 0; i < config.elites; i++)
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{
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// BLT_DEBUG("%lf at %ld", values[i].second, values[i].first);
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next_pop.get_individuals().push_back(current_pop.get_individuals()[values[i].first]);
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}
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}
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while (next_pop.get_individuals().size() < config.population_size)
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@ -63,14 +63,12 @@ namespace blt::gp
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{
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if (execution_function == nullptr)
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{
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std::scoped_lock lock(thread_helper.thread_function_control);
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if (thread_execution_service != nullptr)
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execution_function = thread_execution_service.load(std::memory_order_acquire);
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std::cout.flush();
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std::unique_lock lock(thread_helper.thread_function_control);
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thread_helper.thread_function_condition.wait(lock, [this]() { return thread_execution_service != nullptr; });
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execution_function = thread_execution_service.load(std::memory_order_acquire);
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}
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if (execution_function != nullptr)
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(*execution_function)(i);
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std::this_thread::sleep_for(std::chrono::milliseconds(1));
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}
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}));
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}
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@ -0,0 +1 @@
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perf stat -d -d -d -r 30 -e branches,branch-misses,cache-misses,cache-references,cycles,instructions,alignment-faults,cgroup-switches,faults,duration_time,user_time,system_time,L1-dcache-loads,L1-dcache-load-misses,L1-dcache-prefetches,L1-icache-loads,L1-icache-load-misses,dTLB-loads,dTLB-load-misses,iTLB-loads,iTLB-load-misses,l2_request_g1.all_no_prefetch,page-faults,page-faults:u,page-faults:k ./cmake-build-release-clang/blt-SR-playground-example
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