Re: 100000ii

Keith Edmunds <kae@midnighthax.com> wrote:

> Optimising vim for a use case that will never exist in real life seems,
well, pointless.

> Why is this important to you?

I would not say that it's a useless use case.
It may be a rare case but it can happen. When it happens,
insertion can take so much time that user may have to
press CTRL-C.

I recall that this was discussed earlier but I can't find the thread.
It's probably not simple to fix so it has not been fixed yet.

Performance looks currently quadratic since time is multiplied
by ~ 4 each time we double the insert count:

$ /usr/bin/time ./vim --clean -c 'norm 5000ix' -c 'q!'
0.13user 0.00system 0:00.13elapsed 99%CPU (0avgtext+0avgdata
17532maxresident)k
0inputs+8outputs (0major+1292minor)pagefaults 0swaps

$ /usr/bin/time ./vim --clean -c 'norm 10000ix' -c 'q!'
0.72user 0.00system 0:00.73elapsed 99%CPU (0avgtext+0avgdata
17684maxresident)k
0inputs+8outputs (0major+1301minor)pagefaults 0swaps

$ /usr/bin/time ./vim --clean -c 'norm 20000ix' -c 'q!'
3.37user 0.00system 0:03.37elapsed 99%CPU (0avgtext+0avgdata
17744maxresident)k
0inputs+8outputs (0major+1311minor)pagefaults 0swaps

$ /usr/bin/time ./vim --clean -c 'norm 40000ix' -c 'q!'
14.05user 0.00system 0:14.06elapsed 99%CPU (0avgtext+0avgdata
17592maxresident)k
0inputs+8outputs (0major+1318minor)pagefaults 0swaps

In theory, it could be done quickly in O(n).

Regards
Dominique

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