vm.swap_reserved toooooo large?

[Kostik Belousov]

On Wed, Dec 15, 2010 at 03:43:56PM +0200, George Mamalakis wrote:
> On 15/12/2010 13:26, Trond Endrest??l wrote:
> >On Wed, 15 Dec 2010 13:04+0200, George Mamalakis wrote:
> >
> >>I was testing a program that would exhaust all my memory (in C++),
> >>and when this would happen, it would call set_new_handler() along
> >>with one of my functions that would inform the user about the lack
> >>of memory and then it would exit the program. Instead, the program
> >>was force-killed by the kernel (signal 9) and I was informed that:
> >If all your process' memory is exhausted, then there is no memory left
> >for the runtime system for doing I/O and the other stuff you want.
> >Next, unless I'm on drugs, maybe you should call set_new_handler()
> >before you actually run out of memory. Just my $0.02.
> >
> >
> >Trond.
> >
> >
> >
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> Trond,
> 
> My problem was not that the program was force-killed, my problem was 
> that the system reserved 500G+ of swap, even though the total size is 4G.

Read tuning(7), in particular, the description of vm.overcommit sysctl.
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