[cfe-dev] Clang indexing library performance

[Tobias Grosser]

On 10/01/2011 10:34 AM, Alexander Bolodurin wrote:
> I was playing with libclang-based indexing and clang_complete plugin for Vim.
> Having found completion responsiveness a bit lacking, I decided to track down whether it's plugin's fault.
>
> To put the indexer under stress, I've made up an artificial test with the biggest and baddest C++ headers:
>
> ---------------8<---------------
> #include<boost/asio.hpp>
> #include<boost/regex.hpp>
> #include<boost/thread.hpp>
> #include<boost/spirit.hpp>
> #include<boost/signals2.hpp>
> boost::
> ---------------8<---------------
>
> ...and the following minimal test program using Python bindings:
>
> ---------------8<---------------
> from clang import cindex

        PrecompiledPreamble = 0x04
        CacheCompletionResults = 0x08
        CXXPrecompiledPreamble = 0x10
        flags = PrecompiledPreamble |
                CXXPrecompiledPreamble |
                CacheCompletionResults
  > def clock(f):
>      import time
>      def wrapf(*args,**kw):
>          start = time.time()
>          f(*args,**kw)
>          end = time.time()
>          print f.func_name, end - start
>      return wrapf



>
> fname='...path to file...'
> idx=cindex.Index.create()


> @clock
> def parse():
>      global tu
>      opts = ['-I/opt/local/include'] # MacPorts Boost path
>      tu=idx.parse(fname,opts)

        tu=idx.parse(fname,opts, [], flags)

This should give you a lot better results. You need to define these 
flags by yourself, as they are not yet available in the official python 
bindings.

> @clock
> def complete():
>      c = tu.codeComplete(fname,6,8)

Maybe using this may help even further:
        c = tu.codeComplete(fname,6,8, flags)

>
> parse()
> for i in range(4):
>      complete()
> ---------------8<---------------
>
> This is the timing I get on a Macbook Pro:
>
> parse 3.96061992645
> complete 3.31106615067
> complete 3.17438578606
> complete 3.37997102737
> complete 3.16793084145

Can you send me your new results, either only with the parse() change, 
and then with both the parse() and the complete() change.

Thanks and cheers
Tobi