如何提高Visual C ++编译时间？ [英] How to improve Visual C++ compilation times?
问题描述
我在每次提交时在buildbot中编译2个C ++项目。两者都是大约1000个文件，一个是100 kloc，另一个是170 kloc。编译时间与gcc（4.4）和Visual C ++（2008）非常不同。
一个项目的Visual C ++编译需要20分钟。他们不能利用多个核心，因为一个项目依赖于另一个。最后，在Debug和Release中对两个项目的完整编译，32位和64位需要超过2.5个小时。
gcc编译一个项目在4分钟。它可以并行在4个核心，并需要大约1分10秒。所有8个版本的4个版本（Debug / Release，32/64位）的2个项目都是在不到10分钟内编译。
Visual C ++编译时间？它们基本上慢了5倍。
编译C ++ kloc的平均时间是多少？ Mine是7 s / kloc与vc ++和1.4 s / kloc与gcc。
可以做任何事情以加快Visual C ++的编译时间？
$减慢VC ++编译器的一件事是如果你有一个头文件初始化非三元组的具体实例 const 值类型。您可能会看到类型 std :: string 或GUID的常量发生。它会影响编译和链接时间。 对于单个dll，这会导致10倍的减速。如果将它们放在预编译的头文件中，或者只是在头中声明它们并在cpp文件中初始化它们，这将有所帮助。
请查看病毒扫描程序，并确保实验预编译头，没有它，你不会看到VC ++的最佳状态。
是的，并确保％TMP％文件夹在与您的构建文件写入的分区相同的分区上，因为VC ++生成temp文件并稍后移动它们。
I am compiling 2 C++ projects in a buildbot, on each commit. Both are around 1000 files, one is 100 kloc, the other 170 kloc. Compilation times are very different from gcc (4.4) to Visual C++ (2008).
Visual C++ compilations for one project take in the 20 minutes. They cannot take advantage of the multiple cores because a project depend on the other. In the end, a full compilation of both projects in Debug and Release, in 32 and 64 bits takes more than 2 1/2 hours.
gcc compilations for one project take in the 4 minutes. It can be parallelized on the 4 cores and takes around 1 min 10 secs. All 8 builds for 4 versions (Debug/Release, 32/64 bits) of the 2 projects are compiled in less than 10 minutes.
What is happening with Visual C++ compilation times? They are basically 5 times slower.
What is the average time that can be expected to compile a C++ kloc? Mine are 7 s/kloc with vc++ and 1.4 s/kloc with gcc.
Can anything be done to speed-up compilation times on Visual C++?
One thing that slows down the VC++ compiler is if you have a header file that initializes concrete instances of non-trival const value types. You may see this happen with constants of type std::string or GUIDs. It affects both compilation and link time.
For a single dll, this caused a 10x slowdown. It helps if you put them in a precompiled header file, or, just declare them in a header and initialize them in a cpp file.
Do take a look into the virus scanner, and be sure to experiment with precompiled headers, without it you won't see VC++ at its best.
Oh yeah, and make sure the %TMP% folder is on the same partition as where your build is written to, as VC++ makes temp files and moves them later.
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