Mercurial > hg > graal-compiler
annotate src/share/vm/utilities/taskqueue.cpp @ 1711:a6bff45449bc
6973570: OrderAccess::storestore() scales poorly on multi-socket x64 and sparc: cache-line ping-ponging
Summary: volatile store to static variable removed in favour of a volatile store to stack to avoid excessive cache coherency traffic; verified that the volatile store is not elided by any of our current compilers.
Reviewed-by: dholmes, dice, jcoomes, kvn
author | ysr |
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date | Tue, 10 Aug 2010 14:53:35 -0700 |
parents | 5f429ee79634 |
children | 8b10f48633dc |
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 * | |
1552
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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(_offered_termination < _n_threads, "Invariant"); |
0 | 148 Atomic::inc(&_offered_termination); |
149 | |
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150 uint yield_count = 0; |
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151 // Number of hard spin loops done since last yield |
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152 uint hard_spin_count = 0; |
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153 // Number of iterations in the hard spin loop. |
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154 uint hard_spin_limit = WorkStealingHardSpins; |
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155 |
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156 // If WorkStealingSpinToYieldRatio is 0, no hard spinning is done. |
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157 // If it is greater than 0, then start with a small number |
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158 // of spins and increase number with each turn at spinning until |
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159 // the count of hard spins exceeds WorkStealingSpinToYieldRatio. |
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160 // Then do a yield() call and start spinning afresh. |
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161 if (WorkStealingSpinToYieldRatio > 0) { |
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162 hard_spin_limit = WorkStealingHardSpins >> WorkStealingSpinToYieldRatio; |
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163 hard_spin_limit = MAX2(hard_spin_limit, 1U); |
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164 } |
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165 // Remember the initial spin limit. |
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166 uint hard_spin_start = hard_spin_limit; |
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167 |
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168 // Loop waiting for all threads to offer termination or |
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169 // more work. |
0 | 170 while (true) { |
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171 assert(_offered_termination <= _n_threads, "Invariant"); |
546
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172 // Are all threads offering termination? |
0 | 173 if (_offered_termination == _n_threads) { |
174 return true; | |
175 } else { | |
546
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176 // Look for more work. |
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177 // Periodically sleep() instead of yield() to give threads |
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178 // waiting on the cores the chance to grab this code |
0 | 179 if (yield_count <= WorkStealingYieldsBeforeSleep) { |
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180 // Do a yield or hardspin. For purposes of deciding whether |
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181 // to sleep, count this as a yield. |
0 | 182 yield_count++; |
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183 |
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184 // Periodically call yield() instead spinning |
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185 // After WorkStealingSpinToYieldRatio spins, do a yield() call |
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186 // and reset the counts and starting limit. |
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187 if (hard_spin_count > WorkStealingSpinToYieldRatio) { |
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188 yield(); |
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189 hard_spin_count = 0; |
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190 hard_spin_limit = hard_spin_start; |
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191 #ifdef TRACESPINNING |
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192 _total_yields++; |
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193 #endif |
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194 } else { |
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195 // Hard spin this time |
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196 // Increase the hard spinning period but only up to a limit. |
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197 hard_spin_limit = MIN2(2*hard_spin_limit, |
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198 (uint) WorkStealingHardSpins); |
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199 for (uint j = 0; j < hard_spin_limit; j++) { |
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200 SpinPause(); |
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201 } |
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202 hard_spin_count++; |
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203 #ifdef TRACESPINNING |
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204 _total_spins++; |
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205 #endif |
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206 } |
0 | 207 } else { |
208 if (PrintGCDetails && Verbose) { | |
209 gclog_or_tty->print_cr("ParallelTaskTerminator::offer_termination() " | |
210 "thread %d sleeps after %d yields", | |
211 Thread::current(), yield_count); | |
212 } | |
213 yield_count = 0; | |
214 // A sleep will cause this processor to seek work on another processor's | |
215 // runqueue, if it has nothing else to run (as opposed to the yield | |
216 // which may only move the thread to the end of the this processor's | |
217 // runqueue). | |
218 sleep(WorkStealingSleepMillis); | |
219 } | |
220 | |
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221 #ifdef TRACESPINNING |
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222 _total_peeks++; |
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223 #endif |
342 | 224 if (peek_in_queue_set() || |
225 (terminator != NULL && terminator->should_exit_termination())) { | |
0 | 226 Atomic::dec(&_offered_termination); |
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227 assert(_offered_termination < _n_threads, "Invariant"); |
0 | 228 return false; |
229 } | |
230 } | |
231 } | |
232 } | |
233 | |
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234 #ifdef TRACESPINNING |
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235 void ParallelTaskTerminator::print_termination_counts() { |
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236 gclog_or_tty->print_cr("ParallelTaskTerminator Total yields: %lld " |
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237 "Total spins: %lld Total peeks: %lld", |
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238 total_yields(), |
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239 total_spins(), |
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240 total_peeks()); |
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241 } |
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242 #endif |
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243 |
0 | 244 void ParallelTaskTerminator::reset_for_reuse() { |
245 if (_offered_termination != 0) { | |
246 assert(_offered_termination == _n_threads, | |
247 "Terminator may still be in use"); | |
248 _offered_termination = 0; | |
249 } | |
250 } | |
251 | |
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252 #ifdef ASSERT |
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253 bool ObjArrayTask::is_valid() const { |
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254 return _obj != NULL && _obj->is_objArray() && _index > 0 && |
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255 _index < objArrayOop(_obj)->length(); |
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256 } |
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257 #endif // ASSERT |