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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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516 lines
34 KiB
HTML
516 lines
34 KiB
HTML
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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>>. <<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>
|
||
<body id="benchmark-gem5-build" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect4">
|
||
<h5 id="benchmark-gem5-build"><a class="anchor" href="#benchmark-gem5-build"></a><a class="link" href="#benchmark-gem5-build">35.2.3.3. Benchmark gem5 build</a></h5>
|
||
<div class="paragraph">
|
||
<p>How long it takes to build gem5 itself.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>We will update this whenever the gem5 submodule is updated.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>All benchmarks done on <a href="p51.html">2017 Lenovo ThinkPad P51</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Get results with:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./bench-all --emulator gem5
|
||
tail -n+1 ../linux-kernel-module-cheat-regression/*/gem5-bench-build-*.txt</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Ubuntu 19.10, GCC 9.2.1, LKMC 7c6bb29bc89ec3f1056c0680c3f08bd64018a7bc, gem5 d7d9bc240615625141cd6feddbadd392457e49eb (2020-02-18), <code>./build --arch aarch64 --gem5-worktree master --no-cache</code>: 19m 33s TODO must investigate why it got so much worse.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Ubuntu 20.04, GCC 9.3.0, LKMC 6275f70ed8862d8fe4e58ca4524a6994d254be35, gem5 d9cb548d83fa81858599807f54b52e5be35a6b03 (2020-05-06), <code>./build --arch aarch64 --gem5-worktree master --no-cache</code>: 28m!!! It’s out of control.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Same but gem5 d7d9bc240615625141cd6feddbadd392457e49eb (2018-06-17) hacked with <code>-Wnoerror</code>: 11m 37s. So there was a huge regression in the last two years! We have to find it out.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>A profiling of the build has been done at: <a href="https://gem5.atlassian.net/browse/GEM5-277" class="bare">https://gem5.atlassian.net/browse/GEM5-277</a> Analysis there showed that d7d9bc240615625141cd6feddbadd392457e49eb (2018-06-17) is also composed of 50% pybind11 and with no obvious time sinks.</p>
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<p><a href="pybind11-accounts-for-50-of-gem5-build-time.html">pybind11 accounts for 50% of gem5 build time</a></p>
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</li>
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<li>
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<p><a href="benchmark-gem5-single-file-change-rebuild-time.html">Benchmark gem5 single file change rebuild time</a></p>
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</li>
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<p>← Previous: <a href="benchmark-buildroot-build-baseline.html">Benchmark Buildroot build baseline</a> | ↑ Up: <a href="benchmark-builds.html">Benchmark builds</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="pybind11-accounts-for-50-of-gem5-build-time.html">pybind11 accounts for 50% of gem5 build time</a> →</p>
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