[blfs-support] pcre-8.30

Simon Geard delgarde at ihug.co.nz
Wed Feb 15 01:51:53 PST 2012


On Tue, 2012-02-14 at 21:04 -0600, Bruce Dubbs wrote:
> Fernando de Oliveira wrote:
> 
> > I do not know what a "fork bomb" is and still do not know how to
> > "limit the number of processes and protect against a fork bomb".
> 
> Take a look at wikipedia:
> 
> http://en.wikipedia.org/wiki/Fork_bomb
> 
> You can protect against it by limiting the number of processes available 
> to a user.  Take a look at the bash man page and search for ulimit.  If 
> you want a little more detail, it is basically a kernel system call. 
> See 'man setrlimit'.

On a related note, don't run "make -j", without giving a numeric
parameter. Doing so attempts to perform the compilation with as many
parallel processes as the dependency tree permits. Doing this on
something like the kernel *will* crash the machine.

(Yes, that *is* what I did yesterday, thanks to an unfortunate typo. Six
threads is good, but several thousand not so much.)

Simon.
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