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  26 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
  27 <a name="fiber.performance"></a><a class="link" href="performance.html" title="Performance">Performance</a>
  28 </h2></div></div></div>
  29 <p>
  30       Performance measurements were taken using <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">highresolution_clock</span></code>,
  31       with overhead corrections. The code was compiled using the build options: variant
  32       = release, optimization = speed <sup>[<a name="fiber.performance.f0" href="#ftn.fiber.performance.f0" class="footnote">7</a>]</sup>.
  33     </p>
  34 <p>
  35       The columns labeled <span class="bold"><strong>fiber (atomics)</strong></span> were compiled
  36       with default fiber synchronization, capable of synchronizing fibers running
  37       on different threads. The columns labeled <span class="bold"><strong>fiber (raw)</strong></span>
  38       were compiled with <a class="link" href="overview.html#cross_thread_sync"><code class="computeroutput"><span class="identifier">BOOST_FIBERS_NO_ATOMICS</span></code></a>.
  39     </p>
  40 <div class="table">
  41 <a name="fiber.performance.overhead_of_join__contains_fiber_context_destruction__fiber_stack_deallocation_"></a><p class="title"><b>Table&#160;1.1.&#160;Overhead of join (contains fiber-context destruction, fiber-stack deallocation)</b></p>
  42 <div class="table-contents"><table class="table" summary="Overhead of join (contains fiber-context destruction, fiber-stack deallocation)">
  43 <colgroup>
  44 <col>
  45 <col>
  46 <col>
  47 <col>
  48 <col>
  49 </colgroup>
  50 <thead><tr>
  51 <th>
  52               <p>
  53                 thread
  54               </p>
  55             </th>
  56 <th>
  57               <p>
  58                 fiber (atomics)
  59               </p>
  60             </th>
  61 <th>
  62               <p>
  63                 fiber (raw)
  64               </p>
  65             </th>
  66 <th>
  67               <p>
  68                 tbb
  69               </p>
  70             </th>
  71 <th>
  72               <p>
  73                 qthread
  74               </p>
  75             </th>
  76 </tr></thead>
  77 <tbody><tr>
  78 <td>
  79               <p>
  80                 18 &#181;s
  81               </p>
  82             </td>
  83 <td>
  84               <p>
  85                 950 ns
  86               </p>
  87             </td>
  88 <td>
  89               <p>
  90                 900 ns
  91               </p>
  92             </td>
  93 <td>
  94               <p>
  95                 570 ns
  96               </p>
  97             </td>
  98 <td>
  99               <p>
 100                 620 ns
 101               </p>
 102             </td>
 103 </tr></tbody>
 104 </table></div>
 105 </div>
 106 <br class="table-break"><p>
 107       (from <a href="../../../performance/fiber/overhead_join.cpp" target="_top">overhead_join.cpp</a>)
 108     </p>
 109 <div class="table">
 110 <a name="fiber.performance.overhead_of_detach"></a><p class="title"><b>Table&#160;1.2.&#160;Overhead of detach</b></p>
 111 <div class="table-contents"><table class="table" summary="Overhead of detach">
 112 <colgroup>
 113 <col>
 114 <col>
 115 <col>
 116 </colgroup>
 117 <thead><tr>
 118 <th>
 119               <p>
 120                 thread
 121               </p>
 122             </th>
 123 <th>
 124               <p>
 125                 fiber (atomics)
 126               </p>
 127             </th>
 128 <th>
 129               <p>
 130                 fiber (raw)
 131               </p>
 132             </th>
 133 </tr></thead>
 134 <tbody><tr>
 135 <td>
 136               <p>
 137                 126 ns
 138               </p>
 139             </td>
 140 <td>
 141               <p>
 142                 21 ns
 143               </p>
 144             </td>
 145 <td>
 146               <p>
 147                 20 ns
 148               </p>
 149             </td>
 150 </tr></tbody>
 151 </table></div>
 152 </div>
 153 <br class="table-break"><p>
 154       (from <a href="../../../performance/fiber/overhead_detach.cpp" target="_top">overhead_detach.cpp</a>)
 155     </p>
 156 <div class="table">
 157 <a name="fiber.performance.overhead_of_yield"></a><p class="title"><b>Table&#160;1.3.&#160;Overhead of yield</b></p>
 158 <div class="table-contents"><table class="table" summary="Overhead of yield">
 159 <colgroup>
 160 <col>
 161 <col>
 162 <col>
 163 </colgroup>
 164 <thead><tr>
 165 <th>
 166               <p>
 167                 thread
 168               </p>
 169             </th>
 170 <th>
 171               <p>
 172                 fiber (atomics)
 173               </p>
 174             </th>
 175 <th>
 176               <p>
 177                 fiber (raw)
 178               </p>
 179             </th>
 180 </tr></thead>
 181 <tbody><tr>
 182 <td>
 183               <p>
 184                 1.5 &#181;s
 185               </p>
 186             </td>
 187 <td>
 188               <p>
 189                 310 ns
 190               </p>
 191             </td>
 192 <td>
 193               <p>
 194                 330 ns
 195               </p>
 196             </td>
 197 </tr></tbody>
 198 </table></div>
 199 </div>
 200 <br class="table-break"><p>
 201       (from <a href="../../../performance/fiber/overhead_yield.cpp" target="_top">overhead_yield.cpp</a>)
 202     </p>
 203 <div class="table">
 204 <a name="fiber.performance.overhead_of_waiting_on_a_future"></a><p class="title"><b>Table&#160;1.4.&#160;Overhead of waiting on a future</b></p>
 205 <div class="table-contents"><table class="table" summary="Overhead of waiting on a future">
 206 <colgroup>
 207 <col>
 208 <col>
 209 <col>
 210 </colgroup>
 211 <thead><tr>
 212 <th>
 213               <p>
 214                 thread
 215               </p>
 216             </th>
 217 <th>
 218               <p>
 219                 fiber (atomics)
 220               </p>
 221             </th>
 222 <th>
 223               <p>
 224                 fiber (raw)
 225               </p>
 226             </th>
 227 </tr></thead>
 228 <tbody><tr>
 229 <td>
 230               <p>
 231                 16 &#181;s
 232               </p>
 233             </td>
 234 <td>
 235               <p>
 236                 1.40 &#181;s
 237               </p>
 238             </td>
 239 <td>
 240               <p>
 241                 1.38 &#181;s
 242               </p>
 243             </td>
 244 </tr></tbody>
 245 </table></div>
 246 </div>
 247 <br class="table-break"><p>
 248       (from <a href="../../../performance/fiber/overhead_future.cpp" target="_top">overhead_future.cpp</a>)
 249     </p>
 250 <div class="table">
 251 <a name="fiber.performance.overhead_of_fiber_creation__contains_fiber_stack_allocation_and_preparation__fiber_context_construction__scheduler_handling_"></a><p class="title"><b>Table&#160;1.5.&#160;Overhead of fiber creation (contains fiber-stack allocation and preparation,
 252       fiber-context construction, scheduler handling)</b></p>
 253 <div class="table-contents"><table class="table" summary="Overhead of fiber creation (contains fiber-stack allocation and preparation,
 254       fiber-context construction, scheduler handling)">
 255 <colgroup>
 256 <col>
 257 <col>
 258 <col>
 259 </colgroup>
 260 <thead><tr>
 261 <th>
 262               <p>
 263                 thread
 264               </p>
 265             </th>
 266 <th>
 267               <p>
 268                 fiber (atomics)
 269               </p>
 270             </th>
 271 <th>
 272               <p>
 273                 fiber (raw)
 274               </p>
 275             </th>
 276 </tr></thead>
 277 <tbody><tr>
 278 <td>
 279               <p>
 280                 18 &#181;s
 281               </p>
 282             </td>
 283 <td>
 284               <p>
 285                 450 ns
 286               </p>
 287             </td>
 288 <td>
 289               <p>
 290                 445 ns
 291               </p>
 292             </td>
 293 </tr></tbody>
 294 </table></div>
 295 </div>
 296 <br class="table-break"><p>
 297       (from <a href="../../../performance/fiber/overhead_create.cpp" target="_top">overhead_create.cpp</a>)
 298     </p>
 299 <div class="table">
 300 <a name="fiber.performance.scaling_of_creating_and_joining"></a><p class="title"><b>Table&#160;1.6.&#160;Scaling of creating and joining</b></p>
 301 <div class="table-contents"><table class="table" summary="Scaling of creating and joining">
 302 <colgroup>
 303 <col>
 304 <col>
 305 <col>
 306 <col>
 307 </colgroup>
 308 <thead><tr>
 309 <th>
 310               <p>
 311                 average of
 312               </p>
 313             </th>
 314 <th>
 315               <p>
 316                 thread
 317               </p>
 318             </th>
 319 <th>
 320               <p>
 321                 fiber (atomics)
 322               </p>
 323             </th>
 324 <th>
 325               <p>
 326                 fiber (raw)
 327               </p>
 328             </th>
 329 </tr></thead>
 330 <tbody>
 331 <tr>
 332 <td>
 333               <p>
 334                 10
 335               </p>
 336             </td>
 337 <td>
 338               <p>
 339                 8.21 &#181;s
 340               </p>
 341             </td>
 342 <td>
 343               <p>
 344                 1.96 &#181;s
 345               </p>
 346             </td>
 347 <td>
 348               <p>
 349                 1.85 &#181;s
 350               </p>
 351             </td>
 352 </tr>
 353 <tr>
 354 <td>
 355               <p>
 356                 50
 357               </p>
 358             </td>
 359 <td>
 360               <p>
 361                 6.67 &#181;s
 362               </p>
 363             </td>
 364 <td>
 365               <p>
 366                 1.40 &#181;s
 367               </p>
 368             </td>
 369 <td>
 370               <p>
 371                 1.27 &#181;s
 372               </p>
 373             </td>
 374 </tr>
 375 <tr>
 376 <td>
 377               <p>
 378                 100
 379               </p>
 380             </td>
 381 <td>
 382               <p>
 383                 6.79 &#181;s
 384               </p>
 385             </td>
 386 <td>
 387               <p>
 388                 1.84 &#181;s
 389               </p>
 390             </td>
 391 <td>
 392               <p>
 393                 1.81 &#181;s
 394               </p>
 395             </td>
 396 </tr>
 397 <tr>
 398 <td>
 399               <p>
 400                 500
 401               </p>
 402             </td>
 403 <td>
 404               <p>
 405                 8.25 &#181;s
 406               </p>
 407             </td>
 408 <td>
 409               <p>
 410                 1.13 &#181;s
 411               </p>
 412             </td>
 413 <td>
 414               <p>
 415                 1.10 &#181;s
 416               </p>
 417             </td>
 418 </tr>
 419 <tr>
 420 <td>
 421               <p>
 422                 1000
 423               </p>
 424             </td>
 425 <td>
 426               <p>
 427                 7.71 &#181;s
 428               </p>
 429             </td>
 430 <td>
 431               <p>
 432                 1.46 &#181;s
 433               </p>
 434             </td>
 435 <td>
 436               <p>
 437                 1.26 &#181;s
 438               </p>
 439             </td>
 440 </tr>
 441 <tr>
 442 <td>
 443               <p>
 444                 5000
 445               </p>
 446             </td>
 447 <td>
 448               <p>
 449                 5.67 &#181;s
 450               </p>
 451             </td>
 452 <td>
 453               <p>
 454                 2.11 &#181;s
 455               </p>
 456             </td>
 457 <td>
 458               <p>
 459                 1.90 &#181;s
 460               </p>
 461             </td>
 462 </tr>
 463 <tr>
 464 <td>
 465               <p>
 466                 10000
 467               </p>
 468             </td>
 469 <td>
 470               <p>
 471                 5.25 &#181;s
 472               </p>
 473             </td>
 474 <td>
 475               <p>
 476                 2.36 &#181;s
 477               </p>
 478             </td>
 479 <td>
 480               <p>
 481                 1.89 &#181;s
 482               </p>
 483             </td>
 484 </tr>
 485 </tbody>
 486 </table></div>
 487 </div>
 488 <br class="table-break"><p>
 489       (from <a href="../../../performance/fiber/scale_join.cpp" target="_top">scale_join.cpp</a>)
 490     </p>
 491 <p>
 492       Numbers of the <a href="https://github.com/atemerev/skynet" target="_top">microbenchmark
 493       <span class="emphasis"><em>syknet</em></span></a> from Alexander Temerev <sup>[<a name="fiber.performance.f1" href="#ftn.fiber.performance.f1" class="footnote">8</a>]</sup>:
 494     </p>
 495 <div class="table">
 496 <a name="fiber.performance.performance_of_n_100000_actors_goroutines_fibers"></a><p class="title"><b>Table&#160;1.7.&#160;performance of N=100000 actors/goroutines/fibers</b></p>
 497 <div class="table-contents"><table class="table" summary="performance of N=100000 actors/goroutines/fibers">
 498 <colgroup>
 499 <col>
 500 <col>
 501 <col>
 502 <col>
 503 <col>
 504 </colgroup>
 505 <thead><tr>
 506 <th>
 507               <p>
 508                 Haskell | stack-1.0.4
 509               </p>
 510             </th>
 511 <th>
 512               <p>
 513                 fiber (single threaded/raw) | gcc-5.2.1
 514               </p>
 515             </th>
 516 <th>
 517               <p>
 518                 fiber (single threaded/atomics) | gcc-5.2.1
 519               </p>
 520             </th>
 521 <th>
 522               <p>
 523                 Erlang | erts-7.0
 524               </p>
 525             </th>
 526 <th>
 527               <p>
 528                 Go | go1.4.2
 529               </p>
 530             </th>
 531 </tr></thead>
 532 <tbody><tr>
 533 <td>
 534               <p>
 535                 58ms - 108ms
 536               </p>
 537             </td>
 538 <td>
 539               <p>
 540                 205ms - 263ms
 541               </p>
 542             </td>
 543 <td>
 544               <p>
 545                 221ms - 278ms
 546               </p>
 547             </td>
 548 <td>
 549               <p>
 550                 237ms- 470ms
 551               </p>
 552             </td>
 553 <td>
 554               <p>
 555                 614ms - 883ms
 556               </p>
 557             </td>
 558 </tr></tbody>
 559 </table></div>
 560 </div>
 561 <br class="table-break"><div class="footnotes">
 562 <br><hr width="100" align="left">
 563 <div class="footnote"><p><sup>[<a name="ftn.fiber.performance.f0" href="#fiber.performance.f0" class="para">7</a>] </sup>
 564         Intel Core2 Q6700, x86_64, 3GHz
 565       </p></div>
 566 <div class="footnote"><p><sup>[<a name="ftn.fiber.performance.f1" href="#fiber.performance.f1" class="para">8</a>] </sup>
 567         Intel Core2 Q6700, x86_64, 3GHz
 568       </p></div>
 569 </div>
 570 </div>
 571 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 572 <td align="left"></td>
 573 <td align="right"><div class="copyright-footer">Copyright &#169; 2013 Oliver Kowalke<p>
 574         Distributed under the Boost Software License, Version 1.0. (See accompanying
 575         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
 576       </p>
 577 </div></td>
 578 </tr></table>
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