author | pliden |
Mon, 18 Mar 2019 11:50:40 +0100 | |
changeset 54170 | 8f1771ea1e39 |
parent 53072 | 82d3f0820d37 |
child 54623 | 1126f0607c70 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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#include "precompiled.hpp" |
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#include "gc/z/zGlobals.hpp" |
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#include "gc/z/zTask.hpp" |
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#include "gc/z/zThread.hpp" |
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#include "gc/z/zWorkers.inline.hpp" |
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#include "runtime/os.hpp" |
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#include "runtime/mutexLocker.hpp" |
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#include "runtime/safepoint.hpp" |
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static uint calculate_nworkers_based_on_ncpus(double cpu_share_in_percent) { |
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return ceil(os::initial_active_processor_count() * cpu_share_in_percent / 100.0); |
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} |
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static uint calculate_nworkers_based_on_heap_size(double reserve_share_in_percent) { |
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const int nworkers = ((MaxHeapSize * (reserve_share_in_percent / 100.0)) - ZPageSizeMedium) / ZPageSizeSmall; |
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return MAX2(nworkers, 1); |
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} |
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static uint calculate_nworkers(double cpu_share_in_percent) { |
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// Cap number of workers so that we never use more than 10% of the max heap |
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// for the reserve. This is useful when using small heaps on large machines. |
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return MIN2(calculate_nworkers_based_on_ncpus(cpu_share_in_percent), |
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calculate_nworkers_based_on_heap_size(10.0)); |
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} |
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uint ZWorkers::calculate_nparallel() { |
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// Use 60% of the CPUs, rounded up. We would like to use as many threads as |
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// possible to increase parallelism. However, using a thread count that is |
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// close to the number of processors tends to lead to over-provisioning and |
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// scheduling latency issues. Using 60% of the active processors appears to |
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// be a fairly good balance. |
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return calculate_nworkers(60.0); |
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} |
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uint ZWorkers::calculate_nconcurrent() { |
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// Use 12.5% of the CPUs, rounded up. The number of concurrent threads we |
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// would like to use heavily depends on the type of workload we are running. |
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// Using too many threads will have a negative impact on the application |
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// throughput, while using too few threads will prolong the GC-cycle and |
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// we then risk being out-run by the application. Using 12.5% of the active |
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// processors appears to be a fairly good balance. |
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return calculate_nworkers(12.5); |
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} |
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class ZWorkersInitializeTask : public ZTask { |
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private: |
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const uint _nworkers; |
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uint _started; |
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Monitor _monitor; |
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public: |
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ZWorkersInitializeTask(uint nworkers) : |
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ZTask("ZWorkersInitializeTask"), |
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_nworkers(nworkers), |
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_started(0), |
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_monitor(Monitor::leaf, |
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"ZWorkersInitialize", |
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false /* allow_vm_block */, |
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Monitor::_safepoint_check_never) {} |
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virtual void work() { |
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// Register as worker |
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ZThread::set_worker(); |
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// Wait for all threads to start |
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MonitorLockerEx ml(&_monitor, Monitor::_no_safepoint_check_flag); |
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if (++_started == _nworkers) { |
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// All threads started |
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ml.notify_all(); |
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} else { |
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while (_started != _nworkers) { |
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ml.wait(Monitor::_no_safepoint_check_flag); |
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} |
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} |
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} |
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}; |
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ZWorkers::ZWorkers() : |
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_boost(false), |
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_workers("ZWorker", |
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nworkers(), |
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true /* are_GC_task_threads */, |
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true /* are_ConcurrentGC_threads */) { |
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log_info(gc, init)("Workers: %u parallel, %u concurrent", nparallel(), nconcurrent()); |
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// Initialize worker threads |
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_workers.initialize_workers(); |
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_workers.update_active_workers(nworkers()); |
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if (_workers.active_workers() != nworkers()) { |
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vm_exit_during_initialization("Failed to create ZWorkers"); |
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} |
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// Execute task to register threads as workers. This also helps |
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// reduce latency in early GC pauses, which otherwise would have |
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// to take on any warmup costs. |
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ZWorkersInitializeTask task(nworkers()); |
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run(&task, nworkers()); |
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} |
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void ZWorkers::set_boost(bool boost) { |
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if (boost) { |
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log_debug(gc)("Boosting workers"); |
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} |
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_boost = boost; |
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} |
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void ZWorkers::run(ZTask* task, uint nworkers) { |
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log_debug(gc, task)("Executing Task: %s, Active Workers: %u", task->name(), nworkers); |
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_workers.update_active_workers(nworkers); |
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_workers.run_task(task->gang_task()); |
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} |
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void ZWorkers::run_parallel(ZTask* task) { |
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assert(SafepointSynchronize::is_at_safepoint(), "Should be at a safepoint"); |
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run(task, nparallel()); |
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} |
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void ZWorkers::run_concurrent(ZTask* task) { |
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run(task, nconcurrent()); |
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} |
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void ZWorkers::threads_do(ThreadClosure* tc) const { |
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_workers.threads_do(tc); |
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} |
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void ZWorkers::print_threads_on(outputStream* st) const { |
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_workers.print_worker_threads_on(st); |
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} |