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annotate src/share/vm/runtime/vm_version.hpp @ 10:28372612af5e

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6362677: Change parallel GC collector default number of parallel GC threads. Summary: Use the same default number of GC threads as used by ParNewGC and ConcMarkSweepGC (i.e., the 5/8th rule). Reviewed-by: ysr, tonyp
author jmasa
date Fri, 22 Feb 2008 17:17:14 -0800
parents a61af66fc99e
children d1605aabd0a1
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1 /*
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2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // VM_Version provides information about the VM.
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26
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27 class Abstract_VM_Version: AllStatic {
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28 protected:
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29 friend class VMStructs;
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30 static const char* _s_vm_release;
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31 static const char* _s_internal_vm_info_string;
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32 // These are set by machine-dependent initializations
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33 static bool _supports_cx8;
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34 static unsigned int _logical_processors_per_package;
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35 static int _vm_major_version;
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36 static int _vm_minor_version;
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37 static int _vm_build_number;
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38 static bool _initialized;
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39 static int _parallel_worker_threads;
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40 static bool _parallel_worker_threads_initialized;
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41
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42 static unsigned int nof_parallel_worker_threads(unsigned int num,
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43 unsigned int dem,
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44 unsigned int switch_pt);
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45 public:
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46 static void initialize();
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47
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48 // Name
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49 static const char* vm_name();
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50 // Vendor
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51 static const char* vm_vendor();
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52 // VM version information string printed by launcher (java -version)
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53 static const char* vm_info_string();
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54 static const char* vm_release();
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55 static const char* vm_platform_string();
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56
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57 static int vm_major_version() { assert(_initialized, "not initialized"); return _vm_major_version; }
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58 static int vm_minor_version() { assert(_initialized, "not initialized"); return _vm_minor_version; }
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59 static int vm_build_number() { assert(_initialized, "not initialized"); return _vm_build_number; }
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60
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61 // Gets the jvm_version_info.jvm_version defined in jvm.h
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62 static unsigned int jvm_version();
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63
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64 // Internal version providing additional build information
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65 static const char* internal_vm_info_string();
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66
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67 // does HW support an 8-byte compare-exchange operation?
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68 static bool supports_cx8() {return _supports_cx8;}
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69 static unsigned int logical_processors_per_package() {
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70 return _logical_processors_per_package;
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71 }
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72
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73 // Number of page sizes efficiently supported by the hardware. Most chips now
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74 // support two sizes, thus this default implementation. Processor-specific
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75 // subclasses should define new versions to hide this one as needed. Note
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76 // that the O/S may support more sizes, but at most this many are used.
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77 static uint page_size_count() { return 2; }
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78
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79 // Returns the number of parallel threads to be used for VM
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80 // work. If that number has not been calculated, do so and
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81 // save it. Returns ParallelGCThreads if it is set on the
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82 // command line.
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83 static unsigned int parallel_worker_threads();
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84 // Calculates and returns the number of parallel threads. May
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85 // be VM version specific.
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86 static unsigned int calc_parallel_worker_threads();
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87 };