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POHow do I get Windows to go as fast as Linux for compiling C++?
 

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  1. POHow do I get Windows to go as fast as Linux for compiling C++?
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    <p>I know this is not so much a programming question but it is relevant.</p> <p>I work on a fairly <a href="http://chromium.org" rel="nofollow noreferrer">large cross platform project</a>. On Windows I use VC++ 2008. On Linux I use gcc. There are around 40k files in the project. Windows is 10x to 40x slower than Linux at compiling and linking the same project. How can I fix that?</p> <p>A single change incremental build 20 seconds on Linux and > 3 mins on Windows. Why? I can even install the 'gold' linker in Linux and get that time down to 7 seconds.</p> <p>Similarly git is 10x to 40x faster on Linux than Windows. </p> <p>In the git case it's possible git is not using Windows in the optimal way but VC++? You'd think Microsoft would want to make their own developers as productive as possible and faster compilation would go a long way toward that. Maybe they are trying to encourage developers into C#?</p> <p>As simple test, find a folder with lots of subfolders and do a simple</p> <pre><code>dir /s &gt; c:\list.txt </code></pre> <p>on Windows. Do it twice and time the second run so it runs from the cache. Copy the files to Linux and do the equivalent 2 runs and time the second run.</p> <pre><code>ls -R &gt; /tmp/list.txt </code></pre> <p>I have 2 workstations with the exact same specs. HP Z600s with 12gig of ram, 8 cores at 3.0ghz. On a folder with ~400k files Windows takes 40seconds, Linux takes &lt; 1 second.</p> <p>Is there a registry setting I can set to speed up Windows? What gives?</p> <hr> <p>A few slightly relevant links, relevant to compile times, not necessarily i/o.</p> <ul> <li><p>Apparently <a href="https://randomascii.wordpress.com/2017/07/09/24-core-cpu-and-i-cant-move-my-mouse/" rel="nofollow noreferrer">there's an issue in Windows 10 (not in Windows 7) that closing a process holds a global lock</a>. When compiling with multiple cores and therefore multiple processes this issue hits.</p></li> <li><p><a href="https://randomascii.wordpress.com/2014/03/31/you-got-your-web-browser-in-my-compiler/" rel="nofollow noreferrer">The <code>/analyse</code> option can adversely affect perf because it loads a web browser</a>. (Not relevant here but good to know)</p></li> </ul>
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    1. COI don't know the why, but this is a known difference in the performance characteristics of Windows and Linux, Linux is WAY better than windows at dealing with loads of files in a single directory, possibly it's just NTFS vs ext4/whatever? Could also be that the Windows equivalent of Linux's dentry cache just isn't as good.
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    2. CO1) What build system are you using in each OS? 2) git is known to have performance problems on Windows, due to assumptions about use of dentry, etc... If you want comparisons, try hg. 3) Linux's dentry cache is a big win, and I don't think it has equivalent on other OSes.
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    3. COWhy was this closed? "Not being constructive" ??! I find it quite relevant for developers.
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