1 #ifdef USE_PRAGMA_IDENT_HDR
2 #pragma ident "@(#)generationSizer.hpp 1.17 07/05/05 17:05:27 JVM"
3 #endif
4 /*
5 * Copyright 2001-2006 Sun Microsystems, Inc. All Rights Reserved.
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7 *
8 * This code is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 only, as
10 * published by the Free Software Foundation.
11 *
12 * This code is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * version 2 for more details (a copy is included in the LICENSE file that
16 * accompanied this code).
17 *
18 * You should have received a copy of the GNU General Public License version
19 * 2 along with this work; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
24 * have any questions.
25 *
26 */
27
28 // There is a nice batch of tested generation sizing code in
29 // TwoGenerationCollectorPolicy. Lets reuse it!
30
31 class GenerationSizer : public TwoGenerationCollectorPolicy {
32 public:
33 GenerationSizer() {
34 // Partial init only!
35 initialize_flags();
36 initialize_size_info();
37 }
38
39 void initialize_flags() {
40 // Do basic sizing work
41 this->TwoGenerationCollectorPolicy::initialize_flags();
42
43 // If the user hasn't explicitly set the number of worker
44 // threads, set the count.
45 if (ParallelGCThreads == 0) {
46 assert(UseParallelGC, "Setting ParallelGCThreads without UseParallelGC");
47 ParallelGCThreads = os::active_processor_count();
48 }
49
50 // The survivor ratio's are calculated "raw", unlike the
51 // default gc, which adds 2 to the ratio value. We need to
52 // make sure the values are valid before using them.
53 if (MinSurvivorRatio < 3) {
54 MinSurvivorRatio = 3;
55 }
56
57 if (InitialSurvivorRatio < 3) {
58 InitialSurvivorRatio = 3;
59 }
60 }
61
62 size_t min_young_gen_size() { return _min_gen0_size; }
63 size_t young_gen_size() { return _initial_gen0_size; }
64 size_t max_young_gen_size() { return _max_gen0_size; }
65
66 size_t min_old_gen_size() { return _min_gen1_size; }
67 size_t old_gen_size() { return _initial_gen1_size; }
68 size_t max_old_gen_size() { return _max_gen1_size; }
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1 #ifdef USE_PRAGMA_IDENT_HDR
2 #pragma ident "@(#)generationSizer.hpp 1.17 07/05/05 17:05:27 JVM"
3 #endif
4 /*
5 * Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved.
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7 *
8 * This code is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 only, as
10 * published by the Free Software Foundation.
11 *
12 * This code is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * version 2 for more details (a copy is included in the LICENSE file that
16 * accompanied this code).
17 *
18 * You should have received a copy of the GNU General Public License version
19 * 2 along with this work; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
24 * have any questions.
25 *
26 */
27
28 // There is a nice batch of tested generation sizing code in
29 // TwoGenerationCollectorPolicy. Lets reuse it!
30
31 class GenerationSizer : public TwoGenerationCollectorPolicy {
32 public:
33 GenerationSizer() {
34 // Partial init only!
35 initialize_flags();
36 initialize_size_info();
37 }
38
39 void initialize_flags() {
40 // Do basic sizing work
41 this->TwoGenerationCollectorPolicy::initialize_flags();
42
43 // If the user hasn't explicitly set the number of worker
44 // threads, set the count.
45 assert(UseSerialGC ||
46 !FLAG_IS_DEFAULT(ParallelGCThreads) ||
47 (ParallelGCThreads > 0),
48 "ParallelGCThreads should be set before flag initialization");
49
50 // The survivor ratio's are calculated "raw", unlike the
51 // default gc, which adds 2 to the ratio value. We need to
52 // make sure the values are valid before using them.
53 if (MinSurvivorRatio < 3) {
54 MinSurvivorRatio = 3;
55 }
56
57 if (InitialSurvivorRatio < 3) {
58 InitialSurvivorRatio = 3;
59 }
60 }
61
62 size_t min_young_gen_size() { return _min_gen0_size; }
63 size_t young_gen_size() { return _initial_gen0_size; }
64 size_t max_young_gen_size() { return _max_gen0_size; }
65
66 size_t min_old_gen_size() { return _min_gen1_size; }
67 size_t old_gen_size() { return _initial_gen1_size; }
68 size_t max_old_gen_size() { return _max_gen1_size; }
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