On Wed, 18 Mar 2020 at 13:01, Mikko Rapeli <[email protected]> wrote: > > On Wed, Mar 18, 2020 at 05:52:37AM -0700, Oliver Westermann wrote: > > Hey, > > > > We're currently using a VM on Windows and it's a lot slower than the native > > linux build (which is expected). > > We're looking into getting a dedicated build server for our team (basically > > a self-build tower PC). Any suggestions what to put in that build to get > > the most out of it? > > > > Currently we're looking at a big Ryzen, 64G of RAM and one or multiple SSDs > > on a "consumer grade" board like the X570. > > Drop all virtualization and go for Linux on bare metal. Then make sure there > is enough(tm) physical RAM for each CPU thread. For a "big Ryzen" the 64G of > RAM sounds > too little. I'd go higher there, but it all depends what kind of project > is being compiled. > > I would also setup CPU, RAM, disk IO and network IO monitoring on the build > machines > and review and monitor the build times and results when the project evolves. > There are > times when most CPUs will be idling and there will be times when IO to disk is > happening even when RAM is available. Linux kernel can be tuned to avoid disk > IO if > RAM is still available for example.
What Mikko said is excellent advice. I'd recommend NVMe drives if you can. My build machine has two large M.2 NVMe drives, one is used for the working directory and the other for sstate, downloads and source checkouts to make the best use of the available bandwidth. I find that XFS is a better fit than ext4 when you've got fast drives and highly parallel I/O workloads. Make sure you spread your RAM across the different memory channels on your motherboard as this increases memory bandwidth - this usually means either filling your RAM slots or half-filling them with RAM in every 2nd slot but you'll need to check the motherboard manual to confirm the channel layout. Let me know if you need a detailed review of your proposed setup. Thanks, Paul
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