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annotate src/share/vm/utilities/taskqueue.cpp @ 7411:8580f22db905
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author | coleenp |
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date | Fri, 14 Dec 2012 16:43:37 -0800 |
parents | f34d701e952e |
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rev | line source |
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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 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "oops/oop.inline.hpp" | |
27 #include "runtime/os.hpp" | |
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28 #include "runtime/thread.inline.hpp" |
1972 | 29 #include "utilities/debug.hpp" |
30 #include "utilities/stack.inline.hpp" | |
31 #include "utilities/taskqueue.hpp" | |
0 | 32 |
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33 #ifdef TRACESPINNING |
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34 uint ParallelTaskTerminator::_total_yields = 0; |
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35 uint ParallelTaskTerminator::_total_spins = 0; |
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36 uint ParallelTaskTerminator::_total_peeks = 0; |
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37 #endif |
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38 |
1665 | 39 #if TASKQUEUE_STATS |
40 const char * const TaskQueueStats::_names[last_stat_id] = { | |
41 "qpush", "qpop", "qpop-s", "qattempt", "qsteal", "opush", "omax" | |
42 }; | |
43 | |
1709 | 44 TaskQueueStats & TaskQueueStats::operator +=(const TaskQueueStats & addend) |
45 { | |
46 for (unsigned int i = 0; i < last_stat_id; ++i) { | |
47 _stats[i] += addend._stats[i]; | |
48 } | |
49 return *this; | |
50 } | |
51 | |
1665 | 52 void TaskQueueStats::print_header(unsigned int line, outputStream* const stream, |
53 unsigned int width) | |
54 { | |
55 // Use a width w: 1 <= w <= max_width | |
56 const unsigned int max_width = 40; | |
57 const unsigned int w = MAX2(MIN2(width, max_width), 1U); | |
58 | |
59 if (line == 0) { // spaces equal in width to the header | |
60 const unsigned int hdr_width = w * last_stat_id + last_stat_id - 1; | |
61 stream->print("%*s", hdr_width, " "); | |
62 } else if (line == 1) { // labels | |
63 stream->print("%*s", w, _names[0]); | |
64 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
65 stream->print(" %*s", w, _names[i]); | |
66 } | |
67 } else if (line == 2) { // dashed lines | |
68 char dashes[max_width + 1]; | |
69 memset(dashes, '-', w); | |
70 dashes[w] = '\0'; | |
71 stream->print("%s", dashes); | |
72 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
73 stream->print(" %s", dashes); | |
74 } | |
75 } | |
76 } | |
77 | |
78 void TaskQueueStats::print(outputStream* stream, unsigned int width) const | |
79 { | |
80 #define FMT SIZE_FORMAT_W(*) | |
81 stream->print(FMT, width, _stats[0]); | |
82 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
83 stream->print(" " FMT, width, _stats[i]); | |
84 } | |
85 #undef FMT | |
86 } | |
1709 | 87 |
88 #ifdef ASSERT | |
89 // Invariants which should hold after a TaskQueue has been emptied and is | |
90 // quiescent; they do not hold at arbitrary times. | |
91 void TaskQueueStats::verify() const | |
92 { | |
93 assert(get(push) == get(pop) + get(steal), | |
94 err_msg("push=" SIZE_FORMAT " pop=" SIZE_FORMAT " steal=" SIZE_FORMAT, | |
95 get(push), get(pop), get(steal))); | |
96 assert(get(pop_slow) <= get(pop), | |
97 err_msg("pop_slow=" SIZE_FORMAT " pop=" SIZE_FORMAT, | |
98 get(pop_slow), get(pop))); | |
99 assert(get(steal) <= get(steal_attempt), | |
100 err_msg("steal=" SIZE_FORMAT " steal_attempt=" SIZE_FORMAT, | |
101 get(steal), get(steal_attempt))); | |
102 assert(get(overflow) == 0 || get(push) != 0, | |
103 err_msg("overflow=" SIZE_FORMAT " push=" SIZE_FORMAT, | |
104 get(overflow), get(push))); | |
105 assert(get(overflow_max_len) == 0 || get(overflow) != 0, | |
106 err_msg("overflow_max_len=" SIZE_FORMAT " overflow=" SIZE_FORMAT, | |
107 get(overflow_max_len), get(overflow))); | |
108 } | |
109 #endif // ASSERT | |
1665 | 110 #endif // TASKQUEUE_STATS |
111 | |
0 | 112 int TaskQueueSetSuper::randomParkAndMiller(int *seed0) { |
113 const int a = 16807; | |
114 const int m = 2147483647; | |
115 const int q = 127773; /* m div a */ | |
116 const int r = 2836; /* m mod a */ | |
117 assert(sizeof(int) == 4, "I think this relies on that"); | |
118 int seed = *seed0; | |
119 int hi = seed / q; | |
120 int lo = seed % q; | |
121 int test = a * lo - r * hi; | |
122 if (test > 0) | |
123 seed = test; | |
124 else | |
125 seed = test + m; | |
126 *seed0 = seed; | |
127 return seed; | |
128 } | |
129 | |
130 ParallelTaskTerminator:: | |
131 ParallelTaskTerminator(int n_threads, TaskQueueSetSuper* queue_set) : | |
132 _n_threads(n_threads), | |
133 _queue_set(queue_set), | |
134 _offered_termination(0) {} | |
135 | |
136 bool ParallelTaskTerminator::peek_in_queue_set() { | |
137 return _queue_set->peek(); | |
138 } | |
139 | |
140 void ParallelTaskTerminator::yield() { | |
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141 assert(_offered_termination <= _n_threads, "Invariant"); |
0 | 142 os::yield(); |
143 } | |
144 | |
145 void ParallelTaskTerminator::sleep(uint millis) { | |
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146 assert(_offered_termination <= _n_threads, "Invariant"); |
0 | 147 os::sleep(Thread::current(), millis, false); |
148 } | |
149 | |
342 | 150 bool |
151 ParallelTaskTerminator::offer_termination(TerminatorTerminator* terminator) { | |
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152 assert(_n_threads > 0, "Initialization is incorrect"); |
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153 assert(_offered_termination < _n_threads, "Invariant"); |
0 | 154 Atomic::inc(&_offered_termination); |
155 | |
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156 uint yield_count = 0; |
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157 // Number of hard spin loops done since last yield |
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158 uint hard_spin_count = 0; |
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159 // Number of iterations in the hard spin loop. |
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160 uint hard_spin_limit = WorkStealingHardSpins; |
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161 |
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162 // If WorkStealingSpinToYieldRatio is 0, no hard spinning is done. |
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163 // If it is greater than 0, then start with a small number |
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164 // of spins and increase number with each turn at spinning until |
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165 // the count of hard spins exceeds WorkStealingSpinToYieldRatio. |
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166 // Then do a yield() call and start spinning afresh. |
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167 if (WorkStealingSpinToYieldRatio > 0) { |
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168 hard_spin_limit = WorkStealingHardSpins >> WorkStealingSpinToYieldRatio; |
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169 hard_spin_limit = MAX2(hard_spin_limit, 1U); |
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170 } |
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171 // Remember the initial spin limit. |
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172 uint hard_spin_start = hard_spin_limit; |
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173 |
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174 // Loop waiting for all threads to offer termination or |
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175 // more work. |
0 | 176 while (true) { |
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177 assert(_offered_termination <= _n_threads, "Invariant"); |
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178 // Are all threads offering termination? |
0 | 179 if (_offered_termination == _n_threads) { |
180 return true; | |
181 } else { | |
546
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182 // Look for more work. |
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183 // Periodically sleep() instead of yield() to give threads |
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184 // waiting on the cores the chance to grab this code |
0 | 185 if (yield_count <= WorkStealingYieldsBeforeSleep) { |
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186 // Do a yield or hardspin. For purposes of deciding whether |
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187 // to sleep, count this as a yield. |
0 | 188 yield_count++; |
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189 |
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190 // Periodically call yield() instead spinning |
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191 // After WorkStealingSpinToYieldRatio spins, do a yield() call |
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192 // and reset the counts and starting limit. |
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193 if (hard_spin_count > WorkStealingSpinToYieldRatio) { |
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194 yield(); |
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195 hard_spin_count = 0; |
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196 hard_spin_limit = hard_spin_start; |
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197 #ifdef TRACESPINNING |
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198 _total_yields++; |
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199 #endif |
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200 } else { |
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201 // Hard spin this time |
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202 // Increase the hard spinning period but only up to a limit. |
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203 hard_spin_limit = MIN2(2*hard_spin_limit, |
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204 (uint) WorkStealingHardSpins); |
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205 for (uint j = 0; j < hard_spin_limit; j++) { |
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206 SpinPause(); |
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207 } |
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208 hard_spin_count++; |
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209 #ifdef TRACESPINNING |
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210 _total_spins++; |
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211 #endif |
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212 } |
0 | 213 } else { |
214 if (PrintGCDetails && Verbose) { | |
215 gclog_or_tty->print_cr("ParallelTaskTerminator::offer_termination() " | |
216 "thread %d sleeps after %d yields", | |
217 Thread::current(), yield_count); | |
218 } | |
219 yield_count = 0; | |
220 // A sleep will cause this processor to seek work on another processor's | |
221 // runqueue, if it has nothing else to run (as opposed to the yield | |
222 // which may only move the thread to the end of the this processor's | |
223 // runqueue). | |
224 sleep(WorkStealingSleepMillis); | |
225 } | |
226 | |
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227 #ifdef TRACESPINNING |
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228 _total_peeks++; |
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229 #endif |
342 | 230 if (peek_in_queue_set() || |
231 (terminator != NULL && terminator->should_exit_termination())) { | |
0 | 232 Atomic::dec(&_offered_termination); |
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233 assert(_offered_termination < _n_threads, "Invariant"); |
0 | 234 return false; |
235 } | |
236 } | |
237 } | |
238 } | |
239 | |
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240 #ifdef TRACESPINNING |
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241 void ParallelTaskTerminator::print_termination_counts() { |
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242 gclog_or_tty->print_cr("ParallelTaskTerminator Total yields: %lld " |
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243 "Total spins: %lld Total peeks: %lld", |
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244 total_yields(), |
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245 total_spins(), |
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246 total_peeks()); |
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247 } |
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248 #endif |
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249 |
0 | 250 void ParallelTaskTerminator::reset_for_reuse() { |
251 if (_offered_termination != 0) { | |
252 assert(_offered_termination == _n_threads, | |
253 "Terminator may still be in use"); | |
254 _offered_termination = 0; | |
255 } | |
256 } | |
257 | |
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258 #ifdef ASSERT |
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259 bool ObjArrayTask::is_valid() const { |
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260 return _obj != NULL && _obj->is_objArray() && _index > 0 && |
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261 _index < objArrayOop(_obj)->length(); |
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262 } |
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263 #endif // ASSERT |
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264 |
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265 void ParallelTaskTerminator::reset_for_reuse(int n_threads) { |
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266 reset_for_reuse(); |
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267 _n_threads = n_threads; |
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268 } |