Excellent topic for a wiki page. On Wed, Apr 11, 2012 at 5:30 PM, Darren Hart <dvh...@linux.intel.com> wrote: > > > On 04/11/2012 01:42 PM, Chris Tapp wrote: >> Is there a page somewhere that gives a rough idea of how quickly a full >> build runs on various systems? >> >> I need a faster build platform, but want to get a reasonable price / >> performance balance ;-) >> >> I'm looking at something like an i7-2700K but am not yet tied... >> > > > We really do need to get some pages up on this as it comes up a lot. > > Currently Yocto Project builds scale well up to about 12 Cores, so first > step is to get as many cores as you can. Sacrifice some speed for cores > if you have to. If you can do dual-socket, do it. If not, try for a six > core. > > Next up is storage. We read and write a LOT of data. SSDs are one way to > go, but we've been known to chew through them and they aren't priced as > consumables. You can get about 66% of the performance of a single SSD > with a pair of good quality SATA2 or better drives configured in RAID0 > (no redundancy). Ideally, you would have your OS and sources on an SSD > and use a RAID0 array to build on. This data is all recreatable, so it's > "OK" if you lose a disk and therefor ALL of your build data. > > Now RAM, you will want about 2 GB of RAM per core, with a minimum of 4GB. > > Finally, software. Be sure to run a "server" kernel which is optimized > for throughput as opposed to interactivity (like Desktop kernels). This > implies CONFIG_PREEMPT_NONE=y. You'll want a 64-bit kernel to avoid the > performance penalty inherent with 32bit PAE kernels - and you will want > lots of memory. You can save some IO by mounting your > its-ok-if-i-lose-all-my-data build partition as follows: > > /dev/md0 /build ext4 > noauto,noatime,nodiratime,commit=6000 > > As well as drop the journal from it when you format it. Just don't power > off your machine without properly shutting down! > > That should get you some pretty good build times. > > I run on a beast with 12 cores, 48GB of RAM, OS and sources on a G2 > Intel SSD, with two Seagate Barracudas in a RAID0 array for my /build > partition. I run a headless Ubuntu 11.10 (x86_64) installation running > the 3.0.0-16-server kernel. I can build core-image-minimal in < 30 > minutes and core-image-sato in < 50 minutes from scratch. > > Hopefully that gives you some ideas to get started. > > -- > Darren Hart > Intel Open Source Technology Center > Yocto Project - Linux Kernel > _______________________________________________ > yocto mailing list > yocto@yoctoproject.org > https://lists.yoctoproject.org/listinfo/yocto
-- Jeff Osier-Mixon http://jefro.net/blog Yocto Project Community Manager @Intel http://yoctoproject.org _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto
