/* * Copyright (c) 2018, 2022, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. *
*/
static uint nof_parallel_worker_threads(uint num,
uint den,
uint switch_pt);
// Calculates and returns the number of parallel GC threads. May // be CPU-architecture-specific. static uint calc_parallel_worker_threads();
public: // Returns the number of parallel threads to be used as default value of // ParallelGCThreads. If that number has not been calculated, do so and // save it. Returns ParallelGCThreads if it is set on the // command line. static uint parallel_worker_threads();
// Return number default GC threads to use in the next GC. static uint calc_default_active_workers(uintx total_workers, const uintx min_workers,
uintx active_workers,
uintx application_workers);
// Return number of GC threads to use in the next GC. // This is called sparingly so as not to change the // number of GC workers gratuitously. // For PS scavenge and ParOld collections // For G1 evacuation pauses (subject to update) // For G1 Full GCs (subject to update) // Other collection phases inherit the number of // GC workers from the calls above. static uint calc_active_workers(uintx total_workers,
uintx active_workers,
uintx application_workers);
// Return number of GC threads to use in the next concurrent GC phase. static uint calc_active_conc_workers(uintx total_workers,
uintx active_workers,
uintx application_workers);
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