Yakov Lerner wrote:
> > If creating the swap file takes so much time, something strange is
> > happening. Are you on a network filesystem perhaps? What system is
> > this anyway?
>
> Cygwin.
Perhaps Cygwin libraries do something strange. It's such a mix of Unix
and MS-Windows that you never know what it's doing. You might be better
off with MSVC or MingW.
> But why swapfile is needed for read-only grepping ? Is it
> possible not to create swapfile for dummy buf ? To set readonly
> and nonmodifiable maybe, for dummy buffer ?
Everything is possible, but the main thing is that this works reliably
(thus also for big files that don't fit in memory) and I don't have to
add lots of extra code. Autocommands are very unpredictable, that is a
major concern with making exceptions.
> > Testing with empty files may give a wrong impression. Try something
> > like:
> > :vimgrep notaword $VIMRUNTIME/**/*.vim
> > The .vim files are relatively small.
>
> The remove the regexp code from the picture (search can easily be
> benchmarked separately from file loading), I used artificial temporary
> patch which allows to run N times, see attached patch and script.
I don't think trying to benchmark something that won't happen in real
life is useful. You never know how the results can be translated to
other situations.
> > I tried doing a bit of profiling, but it gets confused by the loops and
> > reports bogus results.
>
> Instead of profiling, I commented out lines in load_dummy_buffer() and
> rerun timing. This is how I saw how different parts affect executiorn
> time.
That requires a lot of recompiling and testing...
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