From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Petazzoni Date: Sun, 5 Jul 2015 11:01:41 +0200 Subject: [Buildroot] [RFC v4 00/16] Add per-package staging feature In-Reply-To: References: <1435520570-20332-1-git-send-email-fabio.porcedda@gmail.com> Message-ID: <20150705110141.17803801@free-electrons.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Hello, On Sun, 5 Jul 2015 10:51:56 +0200, Fabio Porcedda wrote: > I've redone all the tests including the case of the patch set without > using top-level make. > > I've repeated the the test at least two times and taken the minimum value. How much variation did you had between the test builds for a given scenario? Taking the minimal value is a somewhat strange choice :) > defconfig-small: > | HW-HIGH | HW-MED | top-level make | patch set | > |----------------|----------------|-----------------------|---------------| > | 21m17s | 10m13s | no | no | > | 21m24s | 10m17s | no | yes | > | 7m57s | 5m25s | yes | no | > | 7m48s | 5m22s | yes | yes | > > defconfig-full: > | HW-HIGH | HW-MED | top-level make | patch set | > |----------------|----------------|-----------------------|---------------| > | 350m | 199m | no | no | > | 355m | 200m | no | yes | > | 74m | 99m | yes | no | > | 76m | 99m | yes | yes | > > In these tests the penalty of using pps is 0%-3%. > Also the reduction of build time using top-level make is 50%-78% > > I think they are nice numbers :) Yes, they are very good. I guess that if we implement per-package host dir there will be a small additional impact, but clearly the benefits of top-level parallel largely outweighs the impact of per-package staging/host directories. Thanks a lot for having done those additional tests, it clearly means we should progressively merge your work on this topic! Best regards, Thomas -- Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com