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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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791 lines
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HTML
791 lines
56 KiB
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<meta name="description" content="The perfect emulation setup to study and develop the <<linux-kernel>> v5.9.2, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. EVERYTHING is built from source. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 20.04 host.">
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<title>Linux Kernel Module Cheat</title>
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</head>
|
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<body id="benchmark-emulators-on-userland-executables" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect3">
|
||
<h4 id="benchmark-emulators-on-userland-executables"><a class="anchor" href="#benchmark-emulators-on-userland-executables"></a><a class="link" href="#benchmark-emulators-on-userland-executables">35.2.2. Benchmark emulators on userland executables</a></h4>
|
||
<div class="paragraph">
|
||
<p>Let’s see how fast our simulators are running some well known or easy to understand userland benchmarks!</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>TODO: would be amazing to have an automated guest instructions per second count, but I’m not sure how to do that nicely for QEMU: <a href="qemu-get-guest-instruction-count.html">QEMU get guest instruction count</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>TODO: automate this further, produce the results table automatically, possibly by generalizing <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/test-executables">test-executables</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>For now we can just run on gem5 to estimate the instruction count per input size and extrapolate?</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>For example, the simplest scalable CPU content would be an <a href="c-busy-loop.html">C busy loop</a>, so let’s start by analyzing that one.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Summary of manually collected results on <a href="p51.html">2017 Lenovo ThinkPad P51</a> at LKMC a18f28e263c91362519ef550150b5c9d75fa3679 + 1: <a href="benchmark-emulators-on-userland-executables.html#table-busy-loop-dmips">Table 7, “Busy loop MIPS for different simulator setups”</a>. As expected, the less native/more detailed/more complex simulations are slower!</p>
|
||
</div>
|
||
<table id="table-busy-loop-dmips" class="tableblock frame-all grid-all stretch">
|
||
<caption class="title">Table 7. Busy loop MIPS for different simulator setups</caption>
|
||
<colgroup>
|
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<col style="width: 10%;">
|
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<col style="width: 10%;">
|
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<col style="width: 10%;">
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<col style="width: 10%;">
|
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<col style="width: 10%;">
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<col style="width: 10%;">
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<col style="width: 10%;">
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<col style="width: 10%;">
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||
<col style="width: 10%;">
|
||
<col style="width: 10%;">
|
||
</colgroup>
|
||
<thead>
|
||
<tr>
|
||
<th class="tableblock halign-left valign-top">Comment</th>
|
||
<th class="tableblock halign-left valign-top">LKMC</th>
|
||
<th class="tableblock halign-left valign-top">Benchmark build</th>
|
||
<th class="tableblock halign-left valign-top">Emulator command</th>
|
||
<th class="tableblock halign-left valign-top">Loops</th>
|
||
<th class="tableblock halign-left valign-top">Time (s)</th>
|
||
<th class="tableblock halign-left valign-top">Instruction count</th>
|
||
<th class="tableblock halign-left valign-top">Approximate MIPS</th>
|
||
<th class="tableblock halign-left valign-top">Hardware version</th>
|
||
<th class="tableblock halign-left valign-top">Host OS</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">Native busy loop</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">a7ae8e6a8e29ef46d79eb9178d8599d1faeea0e5 + 1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/gcc/busy_loop.c">userland/gcc/busy_loop.c</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>./run --emulator native --userland userland/gcc/busy_loop.c --cli-args 10000000000</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">10^10</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">27</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="p51.html">2017 Lenovo ThinkPad P51</a></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">Ubuntu 20.04</p></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">QEMU aarch64 busy loop</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">a18f28e263c91362519ef550150b5c9d75fa3679 + 1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/gcc/busy_loop.c">userland/gcc/busy_loop.c</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>./run --arch aarch64 --userland userland/gcc/busy_loop.c --cli-args 10000000000</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">10^10</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">68</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1.1 * 10^11 (approx)</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">2000</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">gem5 busy loop</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">a18f28e263c91362519ef550150b5c9d75fa3679</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/gcc/busy_loop.c">userland/gcc/busy_loop.c</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>./run --arch aarch64 --emulator gem5 --static --userland userland/gcc/busy_loop.c --cli-args 1000000</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">10^6</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">18</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">2.4005699 * 10^7</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1.3</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">gem5 empty C program statically linked</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">eb22fd3b6e7fff7e9ef946a88b208debf5b419d5</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/c/empty.c">userland/c/empty.c</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>./run --arch aarch64 --emulator gem5 --static --userland userland/c/empty.c</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">0</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">5475</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">872cb227fdc0b4d60acc7840889d567a6936b6e1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">Ubuntu 20.04</p></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">gem5 empty C program dynamically linked</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">eb22fd3b6e7fff7e9ef946a88b208debf5b419d5</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/c/empty.c">userland/c/empty.c</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>./run --arch aarch64 --emulator gem5 --userland userland/c/empty.c</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">0</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">106999</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">872cb227fdc0b4d60acc7840889d567a6936b6e1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">Ubuntu 20.04</p></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">gem5 busy loop for a debug build</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">a18f28e263c91362519ef550150b5c9d75fa3679 + 1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/gcc/busy_loop.c">userland/gcc/busy_loop.c</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>./run --arch aarch64 --emulator gem5 --gem5-build-type debug --static --userland userland/gcc/busy_loop.c --cli-args 100000</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">10^5</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">33</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">2.405682 * 10^6</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">0.07</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">gem5 busy loop for a fast build</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">0d5a41a3f88fcd7ed40fc19474fe5aed0463663f + 1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/gcc/busy_loop.c">userland/gcc/busy_loop.c</a> <code>-O0 -static</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>./run --arch aarch64 --emulator gem5 --gem5-build-type fast --static --userland userland/gcc/busy_loop.c --cli-args 1000000</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">10^6</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">15</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">2.4005699 * 10^7</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1.6</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">gem5 busy loop for a <a href="gem5-cpu-types.html">TimingSimpleCPU</a></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">a18f28e263c91362519ef550150b5c9d75fa3679 + 1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/gcc/busy_loop.c">userland/gcc/busy_loop.c</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>./run --arch aarch64 --emulator gem5 --arch aarch64 --static --userland userland/gcc/busy_loop.c --cli-args 1000000 -- --cpu-type TimingSimpleCPU --caches</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">10^6</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">26</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">2.4005699 * 10^7</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">0.9</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">gem5 busy loop for a <a href="gem5-cpu-types.html">MinorCPU</a></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">a18f28e263c91362519ef550150b5c9d75fa3679 + 1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/gcc/busy_loop.c">userland/gcc/busy_loop.c</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>./run --arch aarch64 --emulator gem5 --arch aarch64 --userland userland/gcc/busy_loop.c --cli-args 1000000 -- --cpu-type MinorCPU --caches</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">10^6</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">31</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1.1018152 * 10^7</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">0.4</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">gem5 busy loop for a <a href="gem5-cpu-types.html">DerivO3CPU</a></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">a18f28e263c91362519ef550150b5c9d75fa3679 + 1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/gcc/busy_loop.c">userland/gcc/busy_loop.c</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>./run --arch aarch64 --emulator gem5 --userland userland/gcc/busy_loop.c --userland args 1000000 -- --cpu-type DerivO3CPU --caches</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">10^6</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">52</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1.1018128 * 10^7</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">0.2</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">a18f28e263c91362519ef550150b5c9d75fa3679 + 1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/gcc/busy_loop.c">userland/gcc/busy_loop.c</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>./run --arch aarch64 --emulator gem5 --gem5-build-id MOESI_CMP_directory -- --cpu-type DerivO3CPU --caches --ruby</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1 * 1000000 = 10^6</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">63</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1.1005150 * 10^7</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">0.2</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">glibc C pre-main effects</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">ab6f7331406b22f8ab6e2df5f8b8e464fb35b611</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/c/m5ops.c">userland/c/m5ops.c</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>gem5 --arch aarch64 --cli-args e</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1.26479 * 10^5</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">0.05</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">ab6f7331406b22f8ab6e2df5f8b8e464fb35b611</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">glibc C pre-main <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/c/m5ops.c">userland/c/m5ops.c</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>gem5 --arch aarch64 --cli-args e --gem5-build-type debug</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1.26479 * 10^5</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">0.05</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">ab6f7331406b22f8ab6e2df5f8b8e464fb35b611</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">glibc C++ pre-main <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/cpp/m5ops.cpp">userland/cpp/m5ops.cpp</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>gem5 --arch aarch64 --cli-args e</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">2.385012 * 10^6</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">ab6f7331406b22f8ab6e2df5f8b8e464fb35b611</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">glibc C++ pre-main <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/cpp/m5ops.cpp">userland/cpp/m5ops.cpp</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>gem5 --arch aarch64 --cli-args e --gem5-build-type debug</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">25</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">2.385012 * 10^6</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">0.1</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">gem5 optimized build immediate exit on first instruction to benchmark the simulator startup time</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">ab6f7331406b22f8ab6e2df5f8b8e464fb35b611</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">immediate exit <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/freestanding/gem5_exit.S">userland/freestanding/gem5_exit.S</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>gem5 --arch aarch64</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">same as above but debug build</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">ab6f7331406b22f8ab6e2df5f8b8e464fb35b611</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/freestanding/gem5_exit.S">userland/freestanding/gem5_exit.S</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>gem5 --arch aarch64 --gem5-build-type debug</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
</tr>
|
||
<tr>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">Check the effect of an ExecAll log (log every instruction) on execution time, compare to analogous run without it. <code>trace.txt</code> size: 3.5GB. 5x slowdown observed with output to a hard disk.</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">d29a07ddad499f273cc90dd66e40f8474b5dfc40</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/gcc/busy_loop.c">userland/gcc/busy_loop.c</a> <code>-O0</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>./run --arch aarch64 --emulator gem5 --userland userland/gcc/busy_loop.c --cli-args 1000000 --gem5-worktree master --trace ExecAll</code></p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">10^6</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">2.4106774 * 10^7</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">136</p></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">0.2</p></td>
|
||
<td class="tableblock halign-left valign-top"></td>
|
||
<td class="tableblock halign-left valign-top"><p class="tableblock">Same as above but with run command manually hacked to output to a ramfs. Slightly faster, but the bulk was still just in log format operations!</p></td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<div class="paragraph">
|
||
<p>The first step is to determine a number of loops that will run long enough to have meaningful results, but not too long that we will get bored, so about 1 minute.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>On our <a href="p51.html">2017 Lenovo ThinkPad P51</a> machine, we found 10^7 (10 million == 1000 times 10000) loops to be a good number for a gem5 atomic simulation:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run --arch aarch64 --emulator gem5 --userland userland/gcc/busy_loop.c --cli-args '1 10000000'
|
||
./gem5-stat --arch aarch64 sim_insts</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>as it gives:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>time: 00:01:40</p>
|
||
</li>
|
||
<li>
|
||
<p>instructions: 110018162 ~ 110 millions</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>so ~ 110 million instructions / 100 seconds makes ~ 1 MIPS (million instructions per second).</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This experiment also suggests that each loop is about 11 instructions long (110M instructions / 10M loops), which we confirm at <a href="c-busy-loop.html">Section 36.2, “C busy loop”</a>, bingo!</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Then for QEMU, we experimentally turn the number of loops up to 10^10 loops (<code>100000 100000</code>), which contains an expected 11 * 10^10 instructions, and the runtime is 00:01:08, so we have 1.1 * 10^11 instruction / 68 seconds ~ 2 * 10^9 = 2000 MIPS!</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>We can then repeat the experiment for other gem5 CPUs to see how they compare.</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="user-mode-vs-full-system-benchmark.html">User mode vs full system benchmark</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="gem5-x86-64-derivo3cpu-boot-panics.html">gem5 x86_64 DerivO3CPU boot panics</a> | ↑ Up: <a href="benchmark-this-repo-benchmarks.html">Benchmark this repo benchmarks</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="user-mode-vs-full-system-benchmark.html">User mode vs full system benchmark</a> →</p>
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