Re: Vim surprisingly slow?

On 2017-11-14 00:08, Erik Falor wrote:
> Here's what iotop shows during a typical run:
>
> Total DISK READ : 0.00 B/s | Total DISK WRITE : 1372.27 K/s
> Actual DISK READ: 0.00 B/s | Actual DISK WRITE: 2.68 M/s
> TID PRIO USER DISK READ DISK WRITE SWAPIN IO>
> COMMAND 304 be/3 root 0.00 B/s 0.00 B/s 0.00 % 80.22 %
> [jbd2/nvme0n1p2-] 17734 be/4 fadein 0.00 B/s 1372.27 K/s 0.00
> % 0.89 % vim -c source slow.vim data.json

I see similar behavior on mine, with iotop reporting 80-90% of the
usage on the home partition of my drive (where I was writing the file
in question).

I started poking around in the vim source, but nothing stands out to
me other than possibly attempting to run autocmds for every ".w!>>"
which might have some sort of amplification factor.

I don't have a good way to see if it's actually (re)reading the
output file (and possibly executing autocmds on it or other vast
labor) every time it appends to it.

The difference between the "exec '.w>>'" case and the other tests is
striking. The other tests complete in under a second. Meanwhile,
the version attempting to append the line to the file is taking
*minutes* to write/append ~5000 lines.

-tim



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