On Thu, Jul 30, 2020 at 01:06:46PM -0400, Robbie Harwood wrote: > "Richard W.M. Jones" <rjones@xxxxxxxxxx> writes: > > > On Thu, Jul 30, 2020 at 11:46:08AM -0400, Robbie Harwood wrote: > >> Aleksandra Fedorova <alpha@xxxxxxxxxxxx> 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 :) This is sadly true for many :-( For nbdkit though, our test suite will use as many ‘make -j #cores’ as you can throw at it (I have tested 64) :-) Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-builder quickly builds VMs from scratch http://libguestfs.org/virt-builder.1.html _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
