Mercurial > hg > graal-compiler
annotate src/share/vm/utilities/taskqueue.cpp @ 1833:8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
Summary: Associate number of GC workers with the workgang as opposed to the task.
Reviewed-by: johnc, ysr
| author | jmasa |
|---|---|
| date | Mon, 20 Sep 2010 14:38:38 -0700 |
| parents | 5f429ee79634 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1638 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 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 |
| 1665 | 34 #if TASKQUEUE_STATS |
| 35 const char * const TaskQueueStats::_names[last_stat_id] = { | |
| 36 "qpush", "qpop", "qpop-s", "qattempt", "qsteal", "opush", "omax" | |
| 37 }; | |
| 38 | |
| 1709 | 39 TaskQueueStats & TaskQueueStats::operator +=(const TaskQueueStats & addend) |
| 40 { | |
| 41 for (unsigned int i = 0; i < last_stat_id; ++i) { | |
| 42 _stats[i] += addend._stats[i]; | |
| 43 } | |
| 44 return *this; | |
| 45 } | |
| 46 | |
| 1665 | 47 void TaskQueueStats::print_header(unsigned int line, outputStream* const stream, |
| 48 unsigned int width) | |
| 49 { | |
| 50 // Use a width w: 1 <= w <= max_width | |
| 51 const unsigned int max_width = 40; | |
| 52 const unsigned int w = MAX2(MIN2(width, max_width), 1U); | |
| 53 | |
| 54 if (line == 0) { // spaces equal in width to the header | |
| 55 const unsigned int hdr_width = w * last_stat_id + last_stat_id - 1; | |
| 56 stream->print("%*s", hdr_width, " "); | |
| 57 } else if (line == 1) { // labels | |
| 58 stream->print("%*s", w, _names[0]); | |
| 59 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
| 60 stream->print(" %*s", w, _names[i]); | |
| 61 } | |
| 62 } else if (line == 2) { // dashed lines | |
| 63 char dashes[max_width + 1]; | |
| 64 memset(dashes, '-', w); | |
| 65 dashes[w] = '\0'; | |
| 66 stream->print("%s", dashes); | |
| 67 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
| 68 stream->print(" %s", dashes); | |
| 69 } | |
| 70 } | |
| 71 } | |
| 72 | |
| 73 void TaskQueueStats::print(outputStream* stream, unsigned int width) const | |
| 74 { | |
| 75 #define FMT SIZE_FORMAT_W(*) | |
| 76 stream->print(FMT, width, _stats[0]); | |
| 77 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
| 78 stream->print(" " FMT, width, _stats[i]); | |
| 79 } | |
| 80 #undef FMT | |
| 81 } | |
| 1709 | 82 |
| 83 #ifdef ASSERT | |
| 84 // Invariants which should hold after a TaskQueue has been emptied and is | |
| 85 // quiescent; they do not hold at arbitrary times. | |
| 86 void TaskQueueStats::verify() const | |
| 87 { | |
| 88 assert(get(push) == get(pop) + get(steal), | |
| 89 err_msg("push=" SIZE_FORMAT " pop=" SIZE_FORMAT " steal=" SIZE_FORMAT, | |
| 90 get(push), get(pop), get(steal))); | |
| 91 assert(get(pop_slow) <= get(pop), | |
| 92 err_msg("pop_slow=" SIZE_FORMAT " pop=" SIZE_FORMAT, | |
| 93 get(pop_slow), get(pop))); | |
| 94 assert(get(steal) <= get(steal_attempt), | |
| 95 err_msg("steal=" SIZE_FORMAT " steal_attempt=" SIZE_FORMAT, | |
| 96 get(steal), get(steal_attempt))); | |
| 97 assert(get(overflow) == 0 || get(push) != 0, | |
| 98 err_msg("overflow=" SIZE_FORMAT " push=" SIZE_FORMAT, | |
| 99 get(overflow), get(push))); | |
| 100 assert(get(overflow_max_len) == 0 || get(overflow) != 0, | |
| 101 err_msg("overflow_max_len=" SIZE_FORMAT " overflow=" SIZE_FORMAT, | |
| 102 get(overflow_max_len), get(overflow))); | |
| 103 } | |
| 104 #endif // ASSERT | |
| 1665 | 105 #endif // TASKQUEUE_STATS |
| 106 | |
| 0 | 107 int TaskQueueSetSuper::randomParkAndMiller(int *seed0) { |
| 108 const int a = 16807; | |
| 109 const int m = 2147483647; | |
| 110 const int q = 127773; /* m div a */ | |
| 111 const int r = 2836; /* m mod a */ | |
| 112 assert(sizeof(int) == 4, "I think this relies on that"); | |
| 113 int seed = *seed0; | |
| 114 int hi = seed / q; | |
| 115 int lo = seed % q; | |
| 116 int test = a * lo - r * hi; | |
| 117 if (test > 0) | |
| 118 seed = test; | |
| 119 else | |
| 120 seed = test + m; | |
| 121 *seed0 = seed; | |
| 122 return seed; | |
| 123 } | |
| 124 | |
| 125 ParallelTaskTerminator:: | |
| 126 ParallelTaskTerminator(int n_threads, TaskQueueSetSuper* queue_set) : | |
| 127 _n_threads(n_threads), | |
| 128 _queue_set(queue_set), | |
| 129 _offered_termination(0) {} | |
| 130 | |
| 131 bool ParallelTaskTerminator::peek_in_queue_set() { | |
| 132 return _queue_set->peek(); | |
| 133 } | |
| 134 | |
| 135 void ParallelTaskTerminator::yield() { | |
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136 assert(_offered_termination <= _n_threads, "Invariant"); |
| 0 | 137 os::yield(); |
| 138 } | |
| 139 | |
| 140 void ParallelTaskTerminator::sleep(uint millis) { | |
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141 assert(_offered_termination <= _n_threads, "Invariant"); |
| 0 | 142 os::sleep(Thread::current(), millis, false); |
| 143 } | |
| 144 | |
| 342 | 145 bool |
| 146 ParallelTaskTerminator::offer_termination(TerminatorTerminator* terminator) { | |
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147 assert(_n_threads > 0, "Initialization is incorrect"); |
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148 assert(_offered_termination < _n_threads, "Invariant"); |
| 0 | 149 Atomic::inc(&_offered_termination); |
| 150 | |
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151 uint yield_count = 0; |
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152 // Number of hard spin loops done since last yield |
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153 uint hard_spin_count = 0; |
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154 // Number of iterations in the hard spin loop. |
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155 uint hard_spin_limit = WorkStealingHardSpins; |
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156 |
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157 // If WorkStealingSpinToYieldRatio is 0, no hard spinning is done. |
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158 // If it is greater than 0, then start with a small number |
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159 // of spins and increase number with each turn at spinning until |
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160 // the count of hard spins exceeds WorkStealingSpinToYieldRatio. |
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161 // Then do a yield() call and start spinning afresh. |
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162 if (WorkStealingSpinToYieldRatio > 0) { |
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163 hard_spin_limit = WorkStealingHardSpins >> WorkStealingSpinToYieldRatio; |
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164 hard_spin_limit = MAX2(hard_spin_limit, 1U); |
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165 } |
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166 // Remember the initial spin limit. |
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167 uint hard_spin_start = hard_spin_limit; |
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168 |
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169 // Loop waiting for all threads to offer termination or |
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170 // more work. |
| 0 | 171 while (true) { |
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172 assert(_offered_termination <= _n_threads, "Invariant"); |
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173 // Are all threads offering termination? |
| 0 | 174 if (_offered_termination == _n_threads) { |
| 175 return true; | |
| 176 } else { | |
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177 // Look for more work. |
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178 // Periodically sleep() instead of yield() to give threads |
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179 // waiting on the cores the chance to grab this code |
| 0 | 180 if (yield_count <= WorkStealingYieldsBeforeSleep) { |
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181 // Do a yield or hardspin. For purposes of deciding whether |
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182 // to sleep, count this as a yield. |
| 0 | 183 yield_count++; |
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184 |
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185 // Periodically call yield() instead spinning |
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186 // After WorkStealingSpinToYieldRatio spins, do a yield() call |
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187 // and reset the counts and starting limit. |
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188 if (hard_spin_count > WorkStealingSpinToYieldRatio) { |
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189 yield(); |
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190 hard_spin_count = 0; |
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191 hard_spin_limit = hard_spin_start; |
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192 #ifdef TRACESPINNING |
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193 _total_yields++; |
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194 #endif |
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195 } else { |
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196 // Hard spin this time |
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197 // Increase the hard spinning period but only up to a limit. |
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198 hard_spin_limit = MIN2(2*hard_spin_limit, |
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199 (uint) WorkStealingHardSpins); |
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200 for (uint j = 0; j < hard_spin_limit; j++) { |
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201 SpinPause(); |
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202 } |
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203 hard_spin_count++; |
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204 #ifdef TRACESPINNING |
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205 _total_spins++; |
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206 #endif |
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207 } |
| 0 | 208 } else { |
| 209 if (PrintGCDetails && Verbose) { | |
| 210 gclog_or_tty->print_cr("ParallelTaskTerminator::offer_termination() " | |
| 211 "thread %d sleeps after %d yields", | |
| 212 Thread::current(), yield_count); | |
| 213 } | |
| 214 yield_count = 0; | |
| 215 // A sleep will cause this processor to seek work on another processor's | |
| 216 // runqueue, if it has nothing else to run (as opposed to the yield | |
| 217 // which may only move the thread to the end of the this processor's | |
| 218 // runqueue). | |
| 219 sleep(WorkStealingSleepMillis); | |
| 220 } | |
| 221 | |
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222 #ifdef TRACESPINNING |
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223 _total_peeks++; |
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224 #endif |
| 342 | 225 if (peek_in_queue_set() || |
| 226 (terminator != NULL && terminator->should_exit_termination())) { | |
| 0 | 227 Atomic::dec(&_offered_termination); |
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228 assert(_offered_termination < _n_threads, "Invariant"); |
| 0 | 229 return false; |
| 230 } | |
| 231 } | |
| 232 } | |
| 233 } | |
| 234 | |
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235 #ifdef TRACESPINNING |
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236 void ParallelTaskTerminator::print_termination_counts() { |
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237 gclog_or_tty->print_cr("ParallelTaskTerminator Total yields: %lld " |
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238 "Total spins: %lld Total peeks: %lld", |
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239 total_yields(), |
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240 total_spins(), |
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241 total_peeks()); |
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242 } |
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243 #endif |
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244 |
| 0 | 245 void ParallelTaskTerminator::reset_for_reuse() { |
| 246 if (_offered_termination != 0) { | |
| 247 assert(_offered_termination == _n_threads, | |
| 248 "Terminator may still be in use"); | |
| 249 _offered_termination = 0; | |
| 250 } | |
| 251 } | |
| 252 | |
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253 #ifdef ASSERT |
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254 bool ObjArrayTask::is_valid() const { |
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255 return _obj != NULL && _obj->is_objArray() && _index > 0 && |
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256 _index < objArrayOop(_obj)->length(); |
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257 } |
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258 #endif // ASSERT |
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259 |
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260 void ParallelTaskTerminator::reset_for_reuse(int n_threads) { |
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261 reset_for_reuse(); |
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262 _n_threads = n_threads; |
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263 } |
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264 |