Re: Vim surprisingly slow?

On So, 12 Nov 2017, Tim Chase wrote:

> Taking on the challenge listed here
>
> https://dev.to/jorinvo/csv-challenge-1al
>
> it provides a .json file link to mung into date-named files (never
> mind that these happen to all be the same date), I came up with this
> vim solution:
>
> :g/.*name":"\([^"]*\)".*card":"\([^"]*\)".*/let
> s=substitute(getline('.'), '.*stamp":"\(\d\+\)-\(\d\+\)-\(\d\+\).*',
> '\1\2\3','').'.txt'|s//\1,\2/|exec ".w!>>".s
>
> which works. But for some reason, it is *painfully* slow on my
> machine. The basic intent is that it identifies rows with a (fake)
> credit-card number, snapshots the YYYYMMMDD.txt filename, then turns
> the row into a CSV entry ("name, CC"), and writes (appending) that one
> line into the output filename.
>
> The whole thing should happen in a blink. Maybe a second at worst.
> But this was walk-away-do-something-and-come-back slow.
>
> If I change the "exec" to an "echo", it's as fast as I expect.
>
> Any idea what might be making the exec so slow?

No idea and I bet running it under gdb will make it even slower :(

Nevertheless can you try this with a debug Vim and hit <Ctrl>-C

This should give us a clue, which codepath is slow. Please try this
several times, so we are sure, that we hit the slow codepath.

Of course, easier would be to provide a correct profiling information :)

Christian
--
Es gibt erfülltes Leben, trotz vieler unerfüllter Wünsche.
-- Dietrich Bonhoeffer

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