Re: increasing default read size? & using direct read?

> I was noticing that it took a LONG time to read in a 606.9MB file in
> a "local" gvim session (local meaning gvim running on same machine
> as file is located).
>
> I finally figured that it was reading 64KB at a time
> using async reads.
>
> That is really slow compared to using a direct
> read of say, 16M at a time....
>
> I.e. using the async reads, for a 8M file takes 2.14s.
> It averages 4MB/s,
>
> Using a direct read of 16M/read takes .18s averaging 3.5GB/s.
>
> Is there anyway to speed up vim's reading of large files?

Vim is optimized for text files, which are usually not that big.

Besides Reading Vim does other things, such as splitting the text into
lines, checking encoding, etc. And the text has to be copied into data
blocks. The actual read might not be the most important thing, it
requires profiling and perhaps trying out some changes to see what the
effect of a bigger buffer really is.

One thing that has been on the todo list for a very long time is to
avoid the extra copy, but reversing the way text is stored in data
blocks. But that is complicated...

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