test_g1IHOPControl.cpp revision 12069:cba30a8d3ee0 
1/*
2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
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#include "precompiled.hpp"
25#include "gc/g1/g1CollectedHeap.inline.hpp"
26#include "gc/g1/g1IHOPControl.hpp"
27#include "gc/g1/g1Predictions.hpp"
28#include "unittest.hpp"
29
30static void test_update(G1IHOPControl* ctrl, double alloc_time,
31                        size_t alloc_amount, size_t young_size,
32                        double mark_time) {
33  for (int i = 0; i < 100; i++) {
34    ctrl->update_allocation_info(alloc_time, alloc_amount, young_size);
35    ctrl->update_marking_length(mark_time);
36  }
37}
38
39// @requires UseG1GC
40TEST_VM(G1StaticIHOPControl, simple) {
41  // Test requires G1
42  if (!UseG1GC) {
43    return;
44  }
45
46  const size_t initial_ihop = 45;
47
48  G1StaticIHOPControl ctrl(initial_ihop);
49  ctrl.update_target_occupancy(100);
50
51  size_t threshold = ctrl.get_conc_mark_start_threshold();
52  EXPECT_EQ(initial_ihop, threshold);
53
54  ctrl.update_allocation_info(100.0, 100, 100);
55  threshold = ctrl.get_conc_mark_start_threshold();
56  EXPECT_EQ(initial_ihop, threshold);
57
58  ctrl.update_marking_length(1000.0);
59  threshold = ctrl.get_conc_mark_start_threshold();
60  EXPECT_EQ(initial_ihop, threshold);
61
62  // Whatever we pass, the IHOP value must stay the same.
63  test_update(&ctrl, 2, 10, 10, 3);
64  threshold = ctrl.get_conc_mark_start_threshold();
65
66  EXPECT_EQ(initial_ihop, threshold);
67
68  test_update(&ctrl, 12, 10, 10, 3);
69  threshold = ctrl.get_conc_mark_start_threshold();
70
71  EXPECT_EQ(initial_ihop, threshold);
72}
73
74// @requires UseG1GC
75TEST_VM(G1AdaptiveIHOPControl, simple) {
76  // Test requires G1
77  if (!UseG1GC) {
78    return;
79  }
80
81  const size_t initial_threshold = 45;
82  const size_t young_size = 10;
83  const size_t target_size = 100;
84
85  // The final IHOP value is always
86  // target_size - (young_size + alloc_amount/alloc_time * marking_time)
87
88  G1Predictions pred(0.95);
89  G1AdaptiveIHOPControl ctrl(initial_threshold, &pred, 0, 0);
90  ctrl.update_target_occupancy(target_size);
91
92  // First "load".
93  const size_t alloc_time1 = 2;
94  const size_t alloc_amount1 = 10;
95  const size_t marking_time1 = 2;
96  const size_t settled_ihop1 = target_size
97          - (young_size + alloc_amount1 / alloc_time1 * marking_time1);
98
99  size_t threshold;
100  threshold = ctrl.get_conc_mark_start_threshold();
101
102  EXPECT_EQ(initial_threshold, threshold);
103
104  for (size_t i = 0; i < G1AdaptiveIHOPNumInitialSamples - 1; i++) {
105    ctrl.update_allocation_info(alloc_time1, alloc_amount1, young_size);
106    ctrl.update_marking_length(marking_time1);
107    // Not enough data yet.
108    threshold = ctrl.get_conc_mark_start_threshold();
109
110    ASSERT_EQ(initial_threshold, threshold) << "on step " << i;
111  }
112
113  test_update(&ctrl, alloc_time1, alloc_amount1, young_size, marking_time1);
114
115  threshold = ctrl.get_conc_mark_start_threshold();
116
117  EXPECT_EQ(settled_ihop1, threshold);
118
119  // Second "load". A bit higher allocation rate.
120  const size_t alloc_time2 = 2;
121  const size_t alloc_amount2 = 30;
122  const size_t marking_time2 = 2;
123  const size_t settled_ihop2 = target_size
124          - (young_size + alloc_amount2 / alloc_time2 * marking_time2);
125
126  test_update(&ctrl, alloc_time2, alloc_amount2, young_size, marking_time2);
127
128  threshold = ctrl.get_conc_mark_start_threshold();
129
130  EXPECT_LT(threshold, settled_ihop1);
131
132  // Third "load". Very high (impossible) allocation rate.
133  const size_t alloc_time3 = 1;
134  const size_t alloc_amount3 = 50;
135  const size_t marking_time3 = 2;
136  const size_t settled_ihop3 = 0;
137
138  test_update(&ctrl, alloc_time3, alloc_amount3, young_size, marking_time3);
139  threshold = ctrl.get_conc_mark_start_threshold();
140
141  EXPECT_EQ(settled_ihop3, threshold);
142
143  // And back to some arbitrary value.
144  test_update(&ctrl, alloc_time2, alloc_amount2, young_size, marking_time2);
145
146  threshold = ctrl.get_conc_mark_start_threshold();
147
148  EXPECT_GT(threshold, settled_ihop3);
149}
150