hotspot/src/share/vm/runtime/vm_version.cpp
author jmasa
Fri, 22 Feb 2008 17:17:14 -0800
changeset 183 ba55c7f3fd45
parent 1 489c9b5090e2
child 670 ddf3e9583f2f
permissions -rw-r--r--
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
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/*
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 * Copyright 1998-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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# include "incls/_precompiled.incl"
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# include "incls/_vm_version.cpp.incl"
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const char* Abstract_VM_Version::_s_vm_release = Abstract_VM_Version::vm_release();
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const char* Abstract_VM_Version::_s_internal_vm_info_string = Abstract_VM_Version::internal_vm_info_string();
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bool Abstract_VM_Version::_supports_cx8 = false;
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unsigned int Abstract_VM_Version::_logical_processors_per_package = 1U;
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#ifndef HOTSPOT_RELEASE_VERSION
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  #error HOTSPOT_RELEASE_VERSION must be defined
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#endif
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#ifndef JRE_RELEASE_VERSION
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  #error JRE_RELEASE_VERSION must be defined
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#endif
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#ifndef HOTSPOT_BUILD_TARGET
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  #error HOTSPOT_BUILD_TARGET must be defined
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#endif
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#ifdef PRODUCT
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  #define VM_RELEASE HOTSPOT_RELEASE_VERSION
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#else
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  #define VM_RELEASE HOTSPOT_RELEASE_VERSION "-" HOTSPOT_BUILD_TARGET
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#endif
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// HOTSPOT_RELEASE_VERSION must follow the release version naming convention
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// <major_ver>.<minor_ver>-b<nn>[-<identifier>][-<debug_target>]
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int Abstract_VM_Version::_vm_major_version = 0;
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int Abstract_VM_Version::_vm_minor_version = 0;
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int Abstract_VM_Version::_vm_build_number = 0;
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bool Abstract_VM_Version::_initialized = false;
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int Abstract_VM_Version::_parallel_worker_threads = 0;
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bool Abstract_VM_Version::_parallel_worker_threads_initialized = false;
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void Abstract_VM_Version::initialize() {
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  if (_initialized) {
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    return;
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  }
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  char* vm_version = os::strdup(HOTSPOT_RELEASE_VERSION);
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  // Expecting the next vm_version format:
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  // <major_ver>.<minor_ver>-b<nn>[-<identifier>]
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  char* vm_major_ver = vm_version;
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  assert(isdigit(vm_major_ver[0]),"wrong vm major version number");
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  char* vm_minor_ver = strchr(vm_major_ver, '.');
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  assert(vm_minor_ver != NULL && isdigit(vm_minor_ver[1]),"wrong vm minor version number");
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  vm_minor_ver[0] = '\0'; // terminate vm_major_ver
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  vm_minor_ver += 1;
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  char* vm_build_num = strchr(vm_minor_ver, '-');
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  assert(vm_build_num != NULL && vm_build_num[1] == 'b' && isdigit(vm_build_num[2]),"wrong vm build number");
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  vm_build_num[0] = '\0'; // terminate vm_minor_ver
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  vm_build_num += 2;
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  _vm_major_version = atoi(vm_major_ver);
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  _vm_minor_version = atoi(vm_minor_ver);
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  _vm_build_number  = atoi(vm_build_num);
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  os::free(vm_version);
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  _initialized = true;
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}
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#if defined(_LP64)
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  #define VMLP "64-Bit "
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#else
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  #define VMLP ""
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#endif
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#ifdef KERNEL
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  #define VMTYPE "Kernel"
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#else // KERNEL
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#ifdef TIERED
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  #define VMTYPE "Server"
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#else
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  #define VMTYPE COMPILER1_PRESENT("Client")   \
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                 COMPILER2_PRESENT("Server")
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#endif // TIERED
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#endif // KERNEL
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#ifndef HOTSPOT_VM_DISTRO
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  #error HOTSPOT_VM_DISTRO must be defined
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#endif
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#define VMNAME HOTSPOT_VM_DISTRO " " VMLP VMTYPE " VM"
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const char* Abstract_VM_Version::vm_name() {
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  return VMNAME;
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}
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const char* Abstract_VM_Version::vm_vendor() {
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#ifdef VENDOR
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  return XSTR(VENDOR);
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#else
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  return "Sun Microsystems Inc.";
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#endif
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}
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const char* Abstract_VM_Version::vm_info_string() {
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  switch (Arguments::mode()) {
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    case Arguments::_int:
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      return UseSharedSpaces ? "interpreted mode, sharing" : "interpreted mode";
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    case Arguments::_mixed:
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      return UseSharedSpaces ? "mixed mode, sharing"       :  "mixed mode";
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    case Arguments::_comp:
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      return UseSharedSpaces ? "compiled mode, sharing"    : "compiled mode";
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  };
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  ShouldNotReachHere();
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  return "";
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}
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// NOTE: do *not* use stringStream. this function is called by
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//       fatal error handler. if the crash is in native thread,
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//       stringStream cannot get resource allocated and will SEGV.
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const char* Abstract_VM_Version::vm_release() {
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  return VM_RELEASE;
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}
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#define OS       LINUX_ONLY("linux")             \
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                 WINDOWS_ONLY("windows")         \
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                 SOLARIS_ONLY("solaris")
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#define CPU      IA32_ONLY("x86")                \
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                 IA64_ONLY("ia64")               \
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                 AMD64_ONLY("amd64")             \
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                 SPARC_ONLY("sparc")
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const char *Abstract_VM_Version::vm_platform_string() {
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  return OS "-" CPU;
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}
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const char* Abstract_VM_Version::internal_vm_info_string() {
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  #ifndef HOTSPOT_BUILD_USER
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    #define HOTSPOT_BUILD_USER unknown
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  #endif
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  #ifndef HOTSPOT_BUILD_COMPILER
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    #ifdef _MSC_VER
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      #if   _MSC_VER == 1100
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        #define HOTSPOT_BUILD_COMPILER "MS VC++ 5.0"
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      #elif _MSC_VER == 1200
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        #define HOTSPOT_BUILD_COMPILER "MS VC++ 6.0"
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      #elif _MSC_VER == 1310
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        #define HOTSPOT_BUILD_COMPILER "MS VC++ 7.1"
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      #elif _MSC_VER == 1400
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        #define HOTSPOT_BUILD_COMPILER "MS VC++ 8.0"
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      #else
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        #define HOTSPOT_BUILD_COMPILER "unknown MS VC++:" XSTR(_MSC_VER)
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      #endif
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    #elif defined(__SUNPRO_CC)
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      #if   __SUNPRO_CC == 0x420
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        #define HOTSPOT_BUILD_COMPILER "Workshop 4.2"
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      #elif __SUNPRO_CC == 0x500
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        #define HOTSPOT_BUILD_COMPILER "Workshop 5.0 compat=" XSTR(__SUNPRO_CC_COMPAT)
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      #elif __SUNPRO_CC == 0x520
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        #define HOTSPOT_BUILD_COMPILER "Workshop 5.2 compat=" XSTR(__SUNPRO_CC_COMPAT)
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      #elif __SUNPRO_CC == 0x580
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        #define HOTSPOT_BUILD_COMPILER "Workshop 5.8"
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      #elif __SUNPRO_CC == 0x590
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        #define HOTSPOT_BUILD_COMPILER "Workshop 5.9"
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      #else
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        #define HOTSPOT_BUILD_COMPILER "unknown Workshop:" XSTR(__SUNPRO_CC)
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      #endif
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    #elif defined(__GNUC__)
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        #define HOTSPOT_BUILD_COMPILER "gcc " __VERSION__
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    #else
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      #define HOTSPOT_BUILD_COMPILER "unknown compiler"
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    #endif
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  #endif
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  return VMNAME " (" VM_RELEASE ") for " OS "-" CPU
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         " JRE (" JRE_RELEASE_VERSION "), built on " __DATE__ " " __TIME__
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         " by " XSTR(HOTSPOT_BUILD_USER) " with " HOTSPOT_BUILD_COMPILER;
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}
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unsigned int Abstract_VM_Version::jvm_version() {
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  return ((Abstract_VM_Version::vm_major_version() & 0xFF) << 24) |
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         ((Abstract_VM_Version::vm_minor_version() & 0xFF) << 16) |
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         (Abstract_VM_Version::vm_build_number() & 0xFF);
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}
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void VM_Version_init() {
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  VM_Version::initialize();
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#ifndef PRODUCT
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  if (PrintMiscellaneous && Verbose) {
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    os::print_cpu_info(tty);
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  }
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#endif
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}
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unsigned int Abstract_VM_Version::nof_parallel_worker_threads(
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                                                      unsigned int num,
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                                                      unsigned int den,
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                                                      unsigned int switch_pt) {
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  if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
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    assert(ParallelGCThreads == 0, "Default ParallelGCThreads is not 0");
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    // For very large machines, there are diminishing returns
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    // for large numbers of worker threads.  Instead of
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    // hogging the whole system, use a fraction of the workers for every
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    // processor after the first 8.  For example, on a 72 cpu machine
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    // and a chosen fraction of 5/8
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    // use 8 + (72 - 8) * (5/8) == 48 worker threads.
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    unsigned int ncpus = (unsigned int) os::active_processor_count();
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    return (ncpus <= switch_pt) ?
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           ncpus :
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          (switch_pt + ((ncpus - switch_pt) * num) / den);
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  } else {
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    return ParallelGCThreads;
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  }
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}
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unsigned int Abstract_VM_Version::calc_parallel_worker_threads() {
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  return nof_parallel_worker_threads(5, 8, 8);
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}
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// Does not set the _initialized flag since it is
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// a global flag.
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unsigned int Abstract_VM_Version::parallel_worker_threads() {
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  if (!_parallel_worker_threads_initialized) {
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    if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
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      _parallel_worker_threads = VM_Version::calc_parallel_worker_threads();
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    } else {
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      _parallel_worker_threads = ParallelGCThreads;
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    }
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    _parallel_worker_threads_initialized = true;
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  }
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  return _parallel_worker_threads;
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}