CODEWITHSUNDEEP
c++build
Naveen
Naveen

Reputation: 73443

Profiling compilation time

I have a C++ code which I am compiling using VC7 and it is taking a lot of time to build it. Is there any way I could profile it and find why it is taking time to build ?

Upvotes: 7

Views: 5081

Answers (8)

Sand3r
Sand3r

Reputation: 51

Recent Microsoft's C++ Build Insights SDK has introduced an option /timetrace to its vcperf which allows you to profile your build and visualise the build times of specific components in form of a flame graph inside of any chromium-based browser.

Assuming you have vcperf downloaded and installed, you need to:

  1. Start its session by executing
vcperf /start SessionName
  1. Run your build (the events are captured system-wide by vcperf)
  2. Stop the session
vcperf /stop SessionName /timetrace output.json

You can now run your chromium-based browser, type in <browser_name>://tracing, (for example chrome://tracing) and load up the output.json file for visualisation.

Example visualisation taken from here.

Upvotes: 5

Luc Touraille
Luc Touraille

Reputation: 82041

If your code makes extensive use of template, you might be interested in Templight, a tool developed by a hungarian research team for debugging and profiling C++ template metaprograms (paper). It seems very promising, but I'm not sure the tool is available for download...

Upvotes: 1

Zitrax
Zitrax

Reputation: 20255

You can try if possible in your situation the trick of #include all .cpp files into a single compilation unit, just for the purpose of checking if you have much overhead from many files and many includes.

Upvotes: 0

Roger Lipscombe
Roger Lipscombe

Reputation: 91835

In Visual Studio 2008, there's a setting for turning on build timing. It might be there in VC7 as well...

Tools / Options / Projects and Solutions / VC++ Project Settings / Build Timing: Yes

This applies to C++ projects, which (as of VS2008) don't use MSBuild. For MSBuild-based projects (such as C#), you want to increase the verbosity:

Tools / Options / Projects and Solutions / Build and Run / MSBuild project build output verbosity

By default, it's set to "Minimal".

Upvotes: 10

Anonymous
Anonymous

Reputation: 18631

If the code is template-intensive, then you could try doing the template instantiation profiling. Steven Watanabe came up with the profiler and if I remember correctly it was supposed to work with VS (don't know the version).

Upvotes: 4

SmacL
SmacL

Reputation: 22922

My guess is that it would be difficult to get useful results from profiling. You could look at the create times of each .obj file and check if there are any files that are particularly slow, but I doubt this would be the case.

Have you gone through the compiler options such as pre-compiled headers to see what improvements ths provides? Similarly, turning off the optimizer where it is not required can speed the build up significantly. My advice would be to take some time to try out a few 'what if' scenarios.

Upvotes: 1

shoosh
shoosh

Reputation: 78914

Use precompiled headers

Upvotes: -1

Toon Krijthe
Toon Krijthe

Reputation: 53366

Is the source code on a network? This sometimes slows the compilation a lot.

Upvotes: 3

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