Mercurial > hg > graal-compiler
annotate src/share/vm/utilities/taskqueue.cpp @ 1458:dc114f680d9c
Merge.
author | Doug Simon <doug.simon@oracle.com> |
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date | Sat, 13 Nov 2010 08:15:52 +0100 |
parents | 2a1472c30599 |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_taskqueue.cpp.incl" | |
27 | |
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28 #ifdef TRACESPINNING |
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29 uint ParallelTaskTerminator::_total_yields = 0; |
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30 uint ParallelTaskTerminator::_total_spins = 0; |
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31 uint ParallelTaskTerminator::_total_peeks = 0; |
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32 #endif |
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33 |
0 | 34 int TaskQueueSetSuper::randomParkAndMiller(int *seed0) { |
35 const int a = 16807; | |
36 const int m = 2147483647; | |
37 const int q = 127773; /* m div a */ | |
38 const int r = 2836; /* m mod a */ | |
39 assert(sizeof(int) == 4, "I think this relies on that"); | |
40 int seed = *seed0; | |
41 int hi = seed / q; | |
42 int lo = seed % q; | |
43 int test = a * lo - r * hi; | |
44 if (test > 0) | |
45 seed = test; | |
46 else | |
47 seed = test + m; | |
48 *seed0 = seed; | |
49 return seed; | |
50 } | |
51 | |
52 ParallelTaskTerminator:: | |
53 ParallelTaskTerminator(int n_threads, TaskQueueSetSuper* queue_set) : | |
54 _n_threads(n_threads), | |
55 _queue_set(queue_set), | |
56 _offered_termination(0) {} | |
57 | |
58 bool ParallelTaskTerminator::peek_in_queue_set() { | |
59 return _queue_set->peek(); | |
60 } | |
61 | |
62 void ParallelTaskTerminator::yield() { | |
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63 assert(_offered_termination <= _n_threads, "Invariant"); |
0 | 64 os::yield(); |
65 } | |
66 | |
67 void ParallelTaskTerminator::sleep(uint millis) { | |
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68 assert(_offered_termination <= _n_threads, "Invariant"); |
0 | 69 os::sleep(Thread::current(), millis, false); |
70 } | |
71 | |
342 | 72 bool |
73 ParallelTaskTerminator::offer_termination(TerminatorTerminator* terminator) { | |
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74 assert(_offered_termination < _n_threads, "Invariant"); |
0 | 75 Atomic::inc(&_offered_termination); |
76 | |
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77 uint yield_count = 0; |
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78 // Number of hard spin loops done since last yield |
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79 uint hard_spin_count = 0; |
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80 // Number of iterations in the hard spin loop. |
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81 uint hard_spin_limit = WorkStealingHardSpins; |
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82 |
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83 // If WorkStealingSpinToYieldRatio is 0, no hard spinning is done. |
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84 // If it is greater than 0, then start with a small number |
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85 // of spins and increase number with each turn at spinning until |
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86 // the count of hard spins exceeds WorkStealingSpinToYieldRatio. |
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87 // Then do a yield() call and start spinning afresh. |
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88 if (WorkStealingSpinToYieldRatio > 0) { |
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89 hard_spin_limit = WorkStealingHardSpins >> WorkStealingSpinToYieldRatio; |
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90 hard_spin_limit = MAX2(hard_spin_limit, 1U); |
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91 } |
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92 // Remember the initial spin limit. |
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93 uint hard_spin_start = hard_spin_limit; |
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94 |
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95 // Loop waiting for all threads to offer termination or |
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96 // more work. |
0 | 97 while (true) { |
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98 assert(_offered_termination <= _n_threads, "Invariant"); |
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99 // Are all threads offering termination? |
0 | 100 if (_offered_termination == _n_threads) { |
101 return true; | |
102 } else { | |
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103 // Look for more work. |
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104 // Periodically sleep() instead of yield() to give threads |
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105 // waiting on the cores the chance to grab this code |
0 | 106 if (yield_count <= WorkStealingYieldsBeforeSleep) { |
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107 // Do a yield or hardspin. For purposes of deciding whether |
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108 // to sleep, count this as a yield. |
0 | 109 yield_count++; |
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110 |
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111 // Periodically call yield() instead spinning |
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112 // After WorkStealingSpinToYieldRatio spins, do a yield() call |
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113 // and reset the counts and starting limit. |
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114 if (hard_spin_count > WorkStealingSpinToYieldRatio) { |
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115 yield(); |
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116 hard_spin_count = 0; |
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117 hard_spin_limit = hard_spin_start; |
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118 #ifdef TRACESPINNING |
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119 _total_yields++; |
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120 #endif |
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121 } else { |
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122 // Hard spin this time |
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123 // Increase the hard spinning period but only up to a limit. |
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124 hard_spin_limit = MIN2(2*hard_spin_limit, |
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125 (uint) WorkStealingHardSpins); |
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126 for (uint j = 0; j < hard_spin_limit; j++) { |
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127 SpinPause(); |
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128 } |
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129 hard_spin_count++; |
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130 #ifdef TRACESPINNING |
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131 _total_spins++; |
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132 #endif |
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133 } |
0 | 134 } else { |
135 if (PrintGCDetails && Verbose) { | |
136 gclog_or_tty->print_cr("ParallelTaskTerminator::offer_termination() " | |
137 "thread %d sleeps after %d yields", | |
138 Thread::current(), yield_count); | |
139 } | |
140 yield_count = 0; | |
141 // A sleep will cause this processor to seek work on another processor's | |
142 // runqueue, if it has nothing else to run (as opposed to the yield | |
143 // which may only move the thread to the end of the this processor's | |
144 // runqueue). | |
145 sleep(WorkStealingSleepMillis); | |
146 } | |
147 | |
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148 #ifdef TRACESPINNING |
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149 _total_peeks++; |
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150 #endif |
342 | 151 if (peek_in_queue_set() || |
152 (terminator != NULL && terminator->should_exit_termination())) { | |
0 | 153 Atomic::dec(&_offered_termination); |
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154 assert(_offered_termination < _n_threads, "Invariant"); |
0 | 155 return false; |
156 } | |
157 } | |
158 } | |
159 } | |
160 | |
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161 #ifdef TRACESPINNING |
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162 void ParallelTaskTerminator::print_termination_counts() { |
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163 gclog_or_tty->print_cr("ParallelTaskTerminator Total yields: %lld " |
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164 "Total spins: %lld Total peeks: %lld", |
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165 total_yields(), |
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166 total_spins(), |
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167 total_peeks()); |
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168 } |
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169 #endif |
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170 |
0 | 171 void ParallelTaskTerminator::reset_for_reuse() { |
172 if (_offered_termination != 0) { | |
173 assert(_offered_termination == _n_threads, | |
174 "Terminator may still be in use"); | |
175 _offered_termination = 0; | |
176 } | |
177 } | |
178 | |
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179 #ifdef ASSERT |
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180 bool ObjArrayTask::is_valid() const { |
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181 return _obj != NULL && _obj->is_objArray() && _index > 0 && |
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182 _index < objArrayOop(_obj)->length(); |
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183 } |
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184 #endif // ASSERT |
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185 |
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186 bool RegionTaskQueueWithOverflow::is_empty() { |
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187 return (_region_queue.size() == 0) && |
0 | 188 (_overflow_stack->length() == 0); |
189 } | |
190 | |
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191 bool RegionTaskQueueWithOverflow::stealable_is_empty() { |
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192 return _region_queue.size() == 0; |
0 | 193 } |
194 | |
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195 bool RegionTaskQueueWithOverflow::overflow_is_empty() { |
0 | 196 return _overflow_stack->length() == 0; |
197 } | |
198 | |
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199 void RegionTaskQueueWithOverflow::initialize() { |
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200 _region_queue.initialize(); |
0 | 201 assert(_overflow_stack == 0, "Creating memory leak"); |
202 _overflow_stack = | |
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203 new (ResourceObj::C_HEAP) GrowableArray<RegionTask>(10, true); |
0 | 204 } |
205 | |
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206 void RegionTaskQueueWithOverflow::save(RegionTask t) { |
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207 if (TraceRegionTasksQueuing && Verbose) { |
0 | 208 gclog_or_tty->print_cr("CTQ: save " PTR_FORMAT, t); |
209 } | |
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210 if(!_region_queue.push(t)) { |
0 | 211 _overflow_stack->push(t); |
212 } | |
213 } | |
214 | |
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215 // Note that using this method will retrieve all regions |
0 | 216 // that have been saved but that it will always check |
217 // the overflow stack. It may be more efficient to | |
218 // check the stealable queue and the overflow stack | |
219 // separately. | |
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220 bool RegionTaskQueueWithOverflow::retrieve(RegionTask& region_task) { |
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221 bool result = retrieve_from_overflow(region_task); |
0 | 222 if (!result) { |
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223 result = retrieve_from_stealable_queue(region_task); |
0 | 224 } |
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225 if (TraceRegionTasksQueuing && Verbose && result) { |
0 | 226 gclog_or_tty->print_cr(" CTQ: retrieve " PTR_FORMAT, result); |
227 } | |
228 return result; | |
229 } | |
230 | |
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231 bool RegionTaskQueueWithOverflow::retrieve_from_stealable_queue( |
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232 RegionTask& region_task) { |
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233 bool result = _region_queue.pop_local(region_task); |
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234 if (TraceRegionTasksQueuing && Verbose) { |
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235 gclog_or_tty->print_cr("CTQ: retrieve_stealable " PTR_FORMAT, region_task); |
0 | 236 } |
237 return result; | |
238 } | |
239 | |
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240 bool |
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241 RegionTaskQueueWithOverflow::retrieve_from_overflow(RegionTask& region_task) { |
0 | 242 bool result; |
243 if (!_overflow_stack->is_empty()) { | |
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244 region_task = _overflow_stack->pop(); |
0 | 245 result = true; |
246 } else { | |
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247 region_task = (RegionTask) NULL; |
0 | 248 result = false; |
249 } | |
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250 if (TraceRegionTasksQueuing && Verbose) { |
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251 gclog_or_tty->print_cr("CTQ: retrieve_stealable " PTR_FORMAT, region_task); |
0 | 252 } |
253 return result; | |
254 } |