"Richard W.M. Jones" <rjones(a)redhat.com> writes:
On Thu, Jul 30, 2020 at 11:46:08AM -0400, Robbie Harwood wrote:
> Aleksandra Fedorova <alpha(a)bookwar.info> writes:
>
>> As COPR has recently got support for s390 builds, the question is:
>> if emulation is good enough for building packages, can we use it for
>> testing? What are the limitations there? Is it worth it?
>
> Cross-architecture emulation is unbelievably slow in the general
> case. While it helps for some specific use cases, it's not a
> substitute for actually getting hardware.
Since qemu TCG now supports host thread per vCPU you can usually throw
lots of vCPUs at the problem, assuming your builds can be parallelised
and your x86 hardware has plenty of cores.
That's good to know, and definitely I could see that helping with builds
themselves, but won't help with many (most?) test suites :)
Thanks,
--Robbie