On Tue, Jun 02, 2020 at 12:44:17PM +0200, Florian Weimer wrote: > * Panu Matilainen: > > > Lets start with the basics: > > - is sqlite even involved - it will only be used on rawhide builds if > > mock bootstrap is used > > - does it make a difference if you override _db_backend to bdb/sqlite > > from mock config / cli define > > - a reproducer please (eg, what package is considerably slower to > > build than before, and by how much) > > And: Does the difference reproduce when building on tmpfs?
Good time to say that you can use an NBD loopback to mock-build either on a userspace ramdisk or backed by a disk but discarding flush requests. The performance is indistinguishable from tmpfs (and much more flexible in other ways). I did some benchmarking a couple of weeks ago: https://www.redhat.com/archives/libguestfs/2020-May/msg00053.html https://www.redhat.com/archives/libguestfs/2020-May/msg00074.html Easy set up is: # rm -f /tmp/sock # nbdkit -U /tmp/sock memory 100G # nbd-client -b 512 -unix /tmp/sock /dev/nbd0 -connections 4 # mkfs.xfs /dev/nbd0 # mount /dev/nbd0 /var/lib/mock or using http://libguestfs.org/nbdkit-tmpdisk-plugin.1.html: # rm -f /tmp/sock # nbdkit -U /tmp/sock tmpdisk size=100G # nbd-client -b 512 -unix /tmp/sock /dev/nbd0 -connections 1 # mount /dev/nbd0 /var/lib/mock or (requires bleeding edge nbdkit): # rm -f /tmp/sock # lvcreate -L 100G -n tmp /dev/fedora # nbdkit -U /tmp/socket --filter=fua fuamode=discard file /dev/fedora/tmp # nbd-client -b 512 -unix /tmp/sock /dev/nbd0 -connections 4 # mkfs.xfs /dev/nbd0 # mount /dev/nbd0 /var/lib/mock Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org 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@lists.fedoraproject.org
