[CentOS] OT: systemd Poll

Wed Apr 12 02:40:21 UTC 2017
Valeri Galtsev <galtsev at kicp.uchicago.edu>

On Tue, April 11, 2017 9:09 pm, Keith Keller wrote:
> On 2017-04-11, Gordon Messmer <gordon.messmer at gmail.com> wrote:
>> You also don't have the flexibility to replace the kernel.  Or glibc.
> But you do, don't you?  It'll take you months to replace them, or years
> to rewrite, but you *can* do it.

I agree. We had once new machine with 32 bit CPUs and 8GB of RAM - that
time RAM was cheap, but amd664 architecture didn't exist yet,- and
standard kernel only supported 1 GB user space. Not changeable in kernel
config. It took me between one and two weeks to find hardcoded boundaries,
and change them; 3.5 GB for userspace was max I could squeeze leaving the
rest to kernel + stack + ... and still having stable solid system. That
was decent solution.

I wholeheartedly agree with Keith.


> That is the freedom that open source
> software provides that proprietary OSes do not; it does not come with
> the additional promise to provide exactly the software you specify.
> --keith
> --
> kkeller at wombat.san-francisco.ca.us
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Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247