[Haskell-cafe] 1TB vsize for all haskell processes?

Niklas Hamb├╝chen mail at nh2.me
Tue Oct 18 14:26:18 UTC 2016


Hi Tristan and Branimir,

this is interesting, I didn't know that ulimit makes this distinction
and that the way GHC maps the pages doesn't count towards the accounting
limit (the limit as described e.g. on
https://www.etalabs.net/overcommit.html in the section starting with
"The approach taken in reality").

Is it possible to set the the overcommit settings per shell / per
program like `ulimit -v` allows?

On 18/10/16 12:31, Tristan Seligmann wrote:
> As far as I know, this behaviour should not be affected by overcommit as
> the unused pages are all mapped with PROT_NONE and thus do not count
> towards the commit limit as they cannot be used without the mapping
> being changed. `ulimit -v` (aka RLIMIT_AS) however limits the actual
> address space size, and so this does count towards that (as do mmap()ed
> files and other such virtual mappings that do not count towards the
> commit limit).


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