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| 80 | <a title="Welcome to Hoard" href="index.html">Home</a> |
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| 114 | <div id="content"> |
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| 115 | <div id="skinconf-txtlink"></div> |
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| 116 | <h1>Hoard Frequently Asked Questions</h1> |
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| 117 | <div id="minitoc-area"> |
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| 118 | <ul class="minitoc"> |
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| 119 | <li> |
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| 120 | <a href="#%0AWhat+kind+of+applications+will+Hoard+speed+up%3F%0A"> |
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| 121 | What kind of applications will Hoard speed up? |
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| 122 | </a> |
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| 123 | </li> |
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| 124 | <li> |
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| 125 | <a href="#%0A++I%27m+using+the+STL+but+not+seeing+any+performance+improvement.+Why+not%3F%0A++"> |
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| 126 | I'm using the STL but not seeing any performance improvement. Why not? |
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| 127 | </a> |
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| 128 | </li> |
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| 129 | <li> |
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| 130 | <a href="#%0AWhat+systems+does+Hoard+work+on%3F%0A"> |
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| 131 | What systems does Hoard work on? |
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| 132 | </a> |
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| 133 | </li> |
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| 134 | <li> |
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| 135 | <a href="#%0AHave+you+compared+Hoard+with+SmartHeap+SMP%3F%0A"> |
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| 136 | Have you compared Hoard with SmartHeap SMP? |
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| 137 | </a> |
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| 138 | </li> |
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| 139 | <li> |
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| 140 | <a href="#%0A++++++Have+you+compared+Hoard+against+mtmalloc+or+libumem%3F%0A"> |
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| 141 | Have you compared Hoard against mtmalloc or libumem? |
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| 142 | </a> |
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| 143 | </li> |
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| 144 | <li> |
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| 145 | <a href="#%0ACan+I+use+Hoard+with+a+commercial+application%3F%0A"> |
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| 146 | Can I use Hoard with a commercial application? |
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| 147 | </a> |
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| 148 | </li> |
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| 149 | </ul> |
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| 150 | </div> |
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| 151 | |
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| 152 | <a name="N1000C"></a><a name="%0AWhat+kind+of+applications+will+Hoard+speed+up%3F%0A"></a> |
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| 153 | <h2 class="boxed"> |
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| 154 | What kind of applications will Hoard speed up? |
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| 155 | </h2> |
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| 156 | <div class="section"> |
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| 157 | <p> |
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| 158 | Hoard will always improve the performance of multithreaded programs |
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| 159 | running on multiprocessors that make frequent use of the heap (calls |
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| 160 | to malloc/free or new/delete, as well as many STL functions). Because |
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| 161 | Hoard avoids false sharing, Hoard also speeds up programs that only |
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| 162 | occasionally call heap functions but access these objects frequently. |
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| 163 | </p> |
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| 164 | </div> |
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| 165 | |
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| 166 | |
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| 167 | |
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| 168 | <a name="N10016"></a><a name="%0A++I%27m+using+the+STL+but+not+seeing+any+performance+improvement.+Why+not%3F%0A++"></a> |
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| 169 | <h2 class="boxed"> |
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| 170 | I'm using the STL but not seeing any performance improvement. Why not? |
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| 171 | </h2> |
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| 172 | <div class="section"> |
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| 173 | <p> |
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| 174 | In order to benefit from Hoard, you have to tell STL to use malloc instead of its internal custom memory allocator: |
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| 175 | </p> |
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| 176 | <pre class="code"> |
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| 177 | typedef list<unsigned int, malloc_alloc> mylist; |
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| 178 | </pre> |
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| 179 | </div> |
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| 180 | |
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| 181 | |
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| 182 | |
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| 183 | <a name="N10024"></a><a name="%0AWhat+systems+does+Hoard+work+on%3F%0A"></a> |
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| 184 | <h2 class="boxed"> |
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| 185 | What systems does Hoard work on? |
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| 186 | </h2> |
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| 187 | <div class="section"> |
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| 188 | <p> |
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| 189 | Hoard has been successfully tested on numerous Windows, Linux and |
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| 190 | Solaris systems, including a 4-processor x86 box running Windows |
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| 191 | NT/2000, a 4-processor x86 box running RedHat Linux 6.0 and 6.1, and a |
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| 192 | 16-processor Sun Enterprise server running Solaris. |
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| 193 | </p> |
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| 194 | </div> |
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| 195 | |
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| 196 | |
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| 197 | |
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| 198 | <a name="N1002D"></a><a name="%0AHave+you+compared+Hoard+with+SmartHeap+SMP%3F%0A"></a> |
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| 199 | <h2 class="boxed"> |
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| 200 | Have you compared Hoard with SmartHeap SMP? |
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| 201 | </h2> |
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| 202 | <div class="section"> |
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| 203 | <p> |
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| 204 | We tried SmartHeap SMP but it did not work on our Suns (due to an |
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| 205 | apparent race condition in the code). |
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| 206 | </p> |
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| 207 | </div> |
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| 208 | |
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| 209 | |
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| 210 | |
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| 211 | <a name="N10036"></a><a name="%0A++++++Have+you+compared+Hoard+against+mtmalloc+or+libumem%3F%0A"></a> |
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| 212 | <h2 class="boxed"> |
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| 213 | Have you compared Hoard against mtmalloc or libumem? |
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| 214 | </h2> |
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| 215 | <div class="section"> |
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| 216 | <p> |
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| 217 | Yes. Hoard is much faster than either. For example, here's an |
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| 218 | execution of threadtest on Solaris: |
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| 219 | </p> |
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| 220 | <table class="ForrestTable" cellspacing="1" cellpadding="4"> |
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| 221 | |
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| 222 | <tr> |
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| 223 | |
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| 224 | <td colspan="1" rowspan="1">Default:</td> |
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| 225 | <td colspan="1" rowspan="1">4.60 seconds</td> |
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| 226 | |
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| 227 | </tr> |
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| 228 | |
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| 229 | <tr> |
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| 230 | |
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| 231 | <td colspan="1" rowspan="1">Libmtmalloc:</td> |
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| 232 | <td colspan="1" rowspan="1">6.23 seconds</td> |
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| 233 | |
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| 234 | </tr> |
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| 235 | |
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| 236 | <tr> |
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| 237 | |
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| 238 | <td colspan="1" rowspan="1">Libumem:</td> |
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| 239 | <td colspan="1" rowspan="1">5.47 seconds</td> |
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| 240 | |
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| 241 | </tr> |
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| 242 | |
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| 243 | <tr> |
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| 244 | |
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| 245 | <td colspan="1" rowspan="1">Hoard 3.2:</td> |
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| 246 | <td colspan="1" rowspan="1">1.99 seconds</td> |
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| 247 | |
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| 248 | </tr> |
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| 249 | |
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| 250 | </table> |
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| 251 | </div> |
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| 252 | |
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| 253 | |
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| 254 | <a name="N10077"></a><a name="%0ACan+I+use+Hoard+with+a+commercial+application%3F%0A"></a> |
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| 255 | <h2 class="boxed"> |
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| 256 | Can I use Hoard with a commercial application? |
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| 257 | </h2> |
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| 258 | <div class="section"> |
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| 259 | <p> |
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| 260 | Yes. Hoard is available under two licenses. The first license is the |
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| 261 | GNU General Public License. That license is free, but it requires you |
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| 262 | to open-source your application. The second option is to purchase a |
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| 263 | license from the University of Texas at Austin. Click the "Licensing Info" |
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| 264 | link on the left for more information. |
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| 265 | </p> |
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| 266 | </div> |
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| 267 | |
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| 268 | |
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| 284 | <div class="copyright"> |
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| 285 | Copyright © 2005 Emery Berger.</div> |
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| 287 | Send feedback about the website to: |
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| 288 | <a id="feedbackto" href="mailto:emery@cs.umass.edu?subject=Feedback,faqs.html">emery@cs.umass.edu</a> |
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