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 30 static 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 40 TEST_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 75 TEST_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 }