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src/hotspot/share/gc/parallel/parallelArguments.cpp

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   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "gc/parallel/parallelArguments.hpp"
  27 #include "gc/parallel/parallelScavengeHeap.hpp"
  28 #include "gc/shared/adaptiveSizePolicy.hpp"
  29 #include "gc/shared/collectorPolicy.hpp"
  30 #include "gc/shared/gcArguments.inline.hpp"

  31 #include "runtime/globals.hpp"
  32 #include "runtime/globals_extension.hpp"
  33 #include "runtime/java.hpp"

  34 #include "runtime/vm_version.hpp"
  35 #include "utilities/defaultStream.hpp"
  36 
  37 size_t ParallelArguments::conservative_max_heap_alignment() {
  38   return CollectorPolicy::compute_heap_alignment();









































  39 }
  40 
  41 void ParallelArguments::initialize_flags() {
  42   GCArguments::initialize_flags();
  43   assert(UseParallelGC || UseParallelOldGC, "Error");
  44   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
  45   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
  46     FLAG_SET_DEFAULT(UseParallelOldGC, true);
  47   }
  48   FLAG_SET_DEFAULT(UseParallelGC, true);
  49 
  50   // If no heap maximum was requested explicitly, use some reasonable fraction
  51   // of the physical memory, up to a maximum of 1GB.
  52   FLAG_SET_DEFAULT(ParallelGCThreads,
  53                    Abstract_VM_Version::parallel_worker_threads());
  54   if (ParallelGCThreads == 0) {
  55     jio_fprintf(defaultStream::error_stream(),
  56         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
  57     vm_exit(1);
  58   }


  75   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
  76     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
  77        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
  78     }
  79     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
  80       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
  81     }
  82   }
  83 
  84   if (UseParallelOldGC) {
  85     // Par compact uses lower default values since they are treated as
  86     // minimums.  These are different defaults because of the different
  87     // interpretation and are not ergonomically set.
  88     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
  89       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
  90     }
  91   }
  92 }
  93 
  94 CollectedHeap* ParallelArguments::create_heap() {
  95   return create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>();
  96 }


   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "gc/parallel/parallelArguments.hpp"
  27 #include "gc/parallel/parallelScavengeHeap.hpp"
  28 #include "gc/shared/adaptiveSizePolicy.hpp"

  29 #include "gc/shared/gcArguments.inline.hpp"
  30 #include "gc/shared/genArguments.hpp"
  31 #include "runtime/globals.hpp"
  32 #include "runtime/globals_extension.hpp"
  33 #include "runtime/java.hpp"
  34 #include "runtime/os.hpp"
  35 #include "runtime/vm_version.hpp"
  36 #include "utilities/defaultStream.hpp"
  37 
  38 size_t ParallelArguments::conservative_max_heap_alignment() {
  39   return compute_heap_alignment();
  40 }
  41 
  42 void ParallelArguments::initialize_heap_flags_one_pass(PSSettings& s) {
  43   // Do basic sizing work
  44   GenArguments::initialize_heap_flags(s);
  45 
  46   // The survivor ratio's are calculated "raw", unlike the
  47   // default gc, which adds 2 to the ratio value. We need to
  48   // make sure the values are valid before using them.
  49   if (MinSurvivorRatio < 3) {
  50     FLAG_SET_ERGO(uintx, MinSurvivorRatio, 3);
  51   }
  52 
  53   if (InitialSurvivorRatio < 3) {
  54     FLAG_SET_ERGO(uintx, InitialSurvivorRatio, 3);
  55   }
  56 }
  57 
  58 PSSettings ParallelArguments::initialize_heap_flags() {
  59   PSSettings s;
  60 
  61   initialize_heap_flags_one_pass(s);
  62 
  63   const size_t max_page_sz = os::page_size_for_region_aligned(s._max_heap_byte_size, 8);
  64   const size_t min_pages = 4; // 1 for eden + 1 for each survivor + 1 for old
  65   const size_t min_page_sz = os::page_size_for_region_aligned(s._min_heap_byte_size, min_pages);
  66   const size_t page_sz = MIN2(max_page_sz, min_page_sz);
  67 
  68   // Can a page size be something else than a power of two?
  69   assert(is_power_of_2((intptr_t)page_sz), "must be a power of 2");
  70   size_t new_alignment = align_up(page_sz, s._gen_alignment);
  71   if (new_alignment != s._gen_alignment) {
  72     s._gen_alignment = new_alignment;
  73     s._space_alignment = new_alignment;
  74     // Redo everything from the start
  75     initialize_heap_flags_one_pass(s);
  76   }
  77 
  78   GenArguments::initialize_size_info(s);
  79 
  80   return s;
  81 }
  82 
  83 void ParallelArguments::initialize_flags() {
  84   GCArguments::initialize_flags();
  85   assert(UseParallelGC || UseParallelOldGC, "Error");
  86   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
  87   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
  88     FLAG_SET_DEFAULT(UseParallelOldGC, true);
  89   }
  90   FLAG_SET_DEFAULT(UseParallelGC, true);
  91 
  92   // If no heap maximum was requested explicitly, use some reasonable fraction
  93   // of the physical memory, up to a maximum of 1GB.
  94   FLAG_SET_DEFAULT(ParallelGCThreads,
  95                    Abstract_VM_Version::parallel_worker_threads());
  96   if (ParallelGCThreads == 0) {
  97     jio_fprintf(defaultStream::error_stream(),
  98         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
  99     vm_exit(1);
 100   }


 117   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
 118     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
 119        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
 120     }
 121     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
 122       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
 123     }
 124   }
 125 
 126   if (UseParallelOldGC) {
 127     // Par compact uses lower default values since they are treated as
 128     // minimums.  These are different defaults because of the different
 129     // interpretation and are not ergonomically set.
 130     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
 131       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
 132     }
 133   }
 134 }
 135 
 136 CollectedHeap* ParallelArguments::create_heap() {
 137   return new ParallelScavengeHeap(initialize_heap_flags());
 138 }
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