Re: What exactly is our CRC algorithm?

On Fri, Dec 26, 2014 at 04:52:58PM +0100, Andres Freund wrote:
> >Uh, what if the system is compiled on a different CPU that it
> >is
> >run on?  Seems we would need a run-time CPU test.
> 
> That's the cpuid thing mentioned above.

Is this something that could potentially change the data stored on disk?
Does pg_upgrade need to check for changes in this area?  Is the
detection exposed by pg_controldata?  Could this affect running the data
directory on a different CPU?

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