Hi Carlos!
On Mo, 05 Mai 2014, Carlos Santos wrote:
> Hello,
>
> I'm sending this question to the development group because it seems that only
> developers would be able to answer it. Moreover, it involves a possible
> change request.
>
> I work for Red Hat as a software maintenance engineer. Recently one of our
> customers reported a crazy situation in which really BIG server ran out of
> memory due to VIM's undo feature. Some user in their environment did a global
> search and replace ( :%s/\n/,/g ) against a file that had 59 Million lines.
> The operation consumed more than 100 GB of memory and they had to reboot the
> machine in order to restore normal functionality.
Out of curiosity, how much main memory was available?
> The problem is quite easy to reproduce. Even a small scale reproduction with
> a 46 Mb file and 6 Million lines consumed all available memory (12 Gb) of our
> test machine, until oom-killer killed it.
>
> We explained to the customer that they should not use VIM for such task.
> Anyway, there are two questions that I wold like to ask.
>
> 1. Is there a formula that a single search-and-replace consumes x memory? Is
> this documented anywhere?
>
> 2. Would it be reasonable to open a request to implement some kind of maximum
> cap as a safe guard?
Isn't that more or less a use case of ulimit? BTW: For those cases, you
might want to consider the large file plugin (it resets the 'ul' option
which should have prevented that crash).
Best,
Christian
--
Ab 50 denkt man beim Schuhe zubinden darüber nach, was man sonst noch
alles erledigen kann, wenn man schon einmal hier unten ist.
-- Horst Schrodt
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