Re: [lockup] Re: objrmap-core-1 (rmap removal for file mappings to avoid 4:4 in <=16G machines)

[Ingo Molnar]

* Andrea Arcangeli <andrea@xxxxxxx> wrote:

> > or run the attached test-mmap2.c code, which simulates a very small DB
> > app using only 1800 vmas per process: it only maps 8 MB of shm and
> > spawns 32 processes. This has an even more lethal effect than the
> > previous code.
> 
> this use more cpu than the previous one, but no other differences.

how fast is the system you tried this on? If it's faster than the 500
MHz box i tried it on then please try the attached test-mmap3.c. (which
is still not doing anything extreme.)

	Ingo
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