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| 24 | |start group logo |
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| 27 | <a href="http://www.hoard.org"><img class="logoImage" alt="Hoard" src="images/hoard-logo.jpg" title="The Hoard Multiprocessor Memory Allocator"></a> |
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| 77 | <div onclick="SwitchMenu('menu_selected_1.1', 'skin/')" id="menu_selected_1.1Title" class="menutitle" style="background-image: url('skin/images/chapter_open.gif');">Table of Contents</div> |
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| 80 | <a title="Welcome to Hoard" href="index.html">Home</a> |
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| 83 | <a title="Download Hoard" href="download.html">Download</a> |
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| 86 | <div class="menupagetitle">Screenshots</div> |
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| 89 | <a title="How to Use Hoard" href="using.html">Using Hoard</a> |
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| 105 | |alternative credits |
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| 112 | |start content |
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| 114 | <div id="content"> |
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| 115 | <div id="skinconf-txtlink"></div> |
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| 116 | <h1>Screenshots</h1> |
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| 117 | |
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| 118 | |
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| 119 | <p> |
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| 120 | Because Hoard is a transparent plug-in replacement, ordinary |
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| 121 | screenshots don't make much sense, since the applications look and |
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| 122 | work the same! However, it's easy to visualize Hoard's impact on |
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| 123 | application performance. Here are a few example speedup |
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| 124 | graphs. Ideally, the speedup as the number of processors increases |
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| 125 | is a straight diagonal line going from the lower left of each graph |
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| 126 | to the upper right. These benchmarks compare Hoard to Ptmalloc (the |
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| 127 | Linux allocator), mtmalloc version 8, and the Solaris default |
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| 128 | allocator, and are run on a 14-processor Sun. |
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| 129 | </p> |
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| 130 | |
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| 131 | |
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| 132 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
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| 133 | |
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| 134 | <tr> |
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| 135 | |
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| 136 | <td colspan="1" rowspan="1"> |
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| 137 | <!-- <center> --> |
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| 138 | <img alt="Threadtest graph" src="images/plot-threadtest-speedup.gif"> |
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| 139 | <!-- </center> --> |
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| 140 | </td> |
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| 141 | |
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| 142 | </tr> |
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| 143 | |
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| 144 | <tr> |
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| 145 | |
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| 146 | <td colspan="1" rowspan="1"> |
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| 147 | <!-- <center> --> |
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| 148 | |
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| 149 | <p> |
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| 150 | This benchmark has multiple threads, each allocating and freeing |
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| 151 | objects. It stresses raw scalability of allocation in individual |
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| 152 | threads. In this case, Hoard achieves a linear speedup. Ptmalloc |
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| 153 | scales to four processors but then runs out of steam. |
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| 154 | </p> |
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| 155 | <!-- </center> --> |
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| 156 | |
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| 157 | </td> |
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| 158 | |
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| 159 | </tr> |
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| 160 | |
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| 161 | <tr> |
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| 162 | |
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| 163 | <td colspan="1" rowspan="1"> |
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| 164 | <!-- <center> --> |
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| 165 | <img alt="Larson graph" src="images/plot-larson-speedup.gif"> |
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| 166 | <!-- </center> --> |
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| 167 | </td> |
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| 168 | |
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| 169 | </tr> |
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| 170 | |
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| 171 | <tr> |
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| 172 | |
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| 173 | <td colspan="1" rowspan="1"> |
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| 174 | <!-- <center> --> |
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| 175 | |
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| 176 | <p> |
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| 177 | In this benchmark, multiple threads allocate objects and pass some |
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| 178 | objects to other threads that free them. This stresses the ability |
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| 179 | of the memory manager to handle object sharing. Only Hoard scales |
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| 180 | for this case. |
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| 181 | </p> |
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| 182 | <!-- </center> --> |
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| 183 | |
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| 184 | </td> |
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| 185 | |
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| 186 | </tr> |
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| 187 | |
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| 188 | <tr> |
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| 189 | |
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| 190 | <td colspan="1" rowspan="1"> |
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| 191 | <!-- <center> --> |
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| 192 | <img alt="Cache-scratch graph" src="images/plot-cache-scratch-speedup.gif"> |
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| 193 | <!-- </center> --> |
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| 194 | </td> |
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| 195 | |
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| 196 | </tr> |
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| 197 | |
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| 198 | <tr> |
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| 199 | |
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| 200 | <td colspan="1" rowspan="1"> |
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| 201 | <!-- <center> --> |
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| 202 | |
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| 203 | <p> |
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| 204 | A test of whether a memory manager avoids causing false sharing of |
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| 205 | cache lines (an insidious effect that destroys scalability). The |
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| 206 | linear speedup shows that Hoard avoids false sharing completely. |
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| 207 | </p> |
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| 208 | <!-- </center> --> |
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| 209 | |
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| 210 | </td> |
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| 211 | |
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| 212 | </tr> |
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| 213 | |
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| 214 | </table> |
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| 215 | |
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| 216 | |
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| 217 | </div> |
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| 218 | <!--+ |
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| 219 | |end content |
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| 229 | document.write("Last Published: " + document.lastModified); |
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| 230 | // --></script> |
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| 231 | </div> |
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| 232 | <div class="copyright"> |
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| 233 | Copyright © 2005 Emery Berger.</div> |
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| 234 | <div id="feedback"> |
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| 235 | Send feedback about the website to: |
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| 236 | <a id="feedbackto" href="mailto:emery@cs.umass.edu?subject=Feedback,screenshot.html">emery@cs.umass.edu</a> |
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