1452 } |
1452 } |
1453 FLAG_SET_DEFAULT(UseParallelGC, true); |
1453 FLAG_SET_DEFAULT(UseParallelGC, true); |
1454 |
1454 |
1455 // If no heap maximum was requested explicitly, use some reasonable fraction |
1455 // If no heap maximum was requested explicitly, use some reasonable fraction |
1456 // of the physical memory, up to a maximum of 1GB. |
1456 // of the physical memory, up to a maximum of 1GB. |
1457 if (UseParallelGC) { |
1457 FLAG_SET_DEFAULT(ParallelGCThreads, |
1458 FLAG_SET_DEFAULT(ParallelGCThreads, |
1458 Abstract_VM_Version::parallel_worker_threads()); |
1459 Abstract_VM_Version::parallel_worker_threads()); |
1459 if (ParallelGCThreads == 0) { |
1460 |
1460 jio_fprintf(defaultStream::error_stream(), |
1461 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the |
1461 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); |
1462 // SurvivorRatio has been set, reset their default values to SurvivorRatio + |
1462 vm_exit(1); |
1463 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. |
1463 } |
1464 // See CR 6362902 for details. |
1464 |
1465 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { |
1465 |
1466 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { |
1466 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the |
1467 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); |
1467 // SurvivorRatio has been set, reset their default values to SurvivorRatio + |
1468 } |
1468 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. |
1469 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { |
1469 // See CR 6362902 for details. |
1470 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); |
1470 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { |
1471 } |
1471 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { |
1472 } |
1472 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); |
1473 |
1473 } |
1474 if (UseParallelOldGC) { |
1474 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { |
1475 // Par compact uses lower default values since they are treated as |
1475 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); |
1476 // minimums. These are different defaults because of the different |
1476 } |
1477 // interpretation and are not ergonomically set. |
1477 } |
1478 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { |
1478 |
1479 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); |
1479 if (UseParallelOldGC) { |
1480 } |
1480 // Par compact uses lower default values since they are treated as |
|
1481 // minimums. These are different defaults because of the different |
|
1482 // interpretation and are not ergonomically set. |
|
1483 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { |
|
1484 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); |
1481 } |
1485 } |
1482 } |
1486 } |
1483 } |
1487 } |
1484 |
1488 |
1485 void Arguments::set_g1_gc_flags() { |
1489 void Arguments::set_g1_gc_flags() { |