John Little wrote:
> Over on vim_use, in suggesting a solution to someone who wants to sort
> blocks of text by their titles, I ran the following in vim 7.3.55:
>
> :e $VIMRUNTIME/doc/eval.txt
> :save /tmp/eval.txt
> :v/^\d\+\. .*\*$/s/$/xyzzy
> :g/xyzzy/-j!
>
> With this vim's heap grew to 512 MiB, and my 1 GiB system swapped
> somewhat for a while, and it ran at 100% of cpu for a long time,
> having reported 8350 fewer lines. I closed the window and vim let me
> save the file.
>
> If I issue :syntax off before joining the lines, the command completes
> in a few seconds (if there's free memory) and does not run 100% cpu at
> all.
>
> So I see two problems:
> 1) Profligate memory use. (I tried running with valgrind, and
> reported 536,211,001 bytes in use at exit, but the same, minor leaks
> as starting vim and immediately quitting.) Perhaps this is really a
> memory allocator deficiency, with vim repeatedly requesting slightly
> larger blocks to accommodate the growing line, and the allocator
> failing to consolidate the freed blocks.
Or it's text saved for undo. Try setting 'undolevels' to -1.
> 2) Syntax colouring for vim help doesn't cope with very long lines.
> Fair enough, one might say, but perhaps it could fail more gracefully.
What is 'synmaxcol' set to?
> I don't really expect anything much to happen about these; I spent
> some time finding this stuff out so I thought I'd set it down, in case
> it added to the picture helpfully.
>
> (BTW, I followed with
> :sort /\d\+\. /
> :%s/xyzzy/\r/g
> :g/^\d\+\. .*\*$/-m .
> and it worked as intended.)
>
> Regards, John
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