On 05/28/2015 03:41 PM, Jason L Tibbitts III wrote:
>>>>> "MS" == Miroslav Suchy
MS> The performance increase is huge and I believe Koji can do the same.
I have always done my local mock builds in tmpfs and indeed the
performance increase is huge. There were, however, odd problems in the
past with tmpfs not supporting some necessary features (like
capabilities, I think) which would get in the way of using it for
everything. I don't know if that's solved now, and particularly if it's
solved on whatever OS our builders run currently.
Also, some builders do not necessarily have a lot of ram. Some
buildroots are large, some sources are extremely large (e.g. texlive).
If we do this, it will need to be configurable, probably per-package or
size: The limit of allocated bytes for this tmpfs instance. The
default is half of your physical RAM without swap. If you
oversize your tmpfs instances the machine will deadlock
since the OOM handler will not be able to free that memory.
"machine will deadlock" does not sound promising
Note that it should be possible to enable the tmpfs plugin in
default.cfg on koji builders if folks want to play around with this. The
mock configs that koji writes do not say anything about the tmpfs plugin.