Re: lang/rust is super slow to build

On Dec 12, 2022, at 2:27 PM, Pat Maddox <pat@patmaddox.com> wrote:


> Using poudriere, lang/rust is at 2 hours and counting on my 10-core i9 w/ 128 gigs of RAM.
> 
> Does that sound right? It seems extremely slow to me, but this is my first time building it.
> 
> How long does it take others to build? What options are you using, or any other suggestions for shortening the time?


It used to take much longer than that on my 6-core AMD system with 16 GB RAM---about 9 hours, from memory.  It's what led me to install and set up ports-mgmt/sccache-overlay to speed up subsequent builds, which it did (but which brought its own problems).

Because I use them just as ports build dependencies, latterly, I've been experimenting with using poudriere-devel to download dependencies like rust, gcc*, and llvm* from the FreeBSD.org package repositories rather than build them locally.  It's been hit and miss, with options conflicts sometimes causing a refusal to download the FreeBSD.org version of the package.

Finally, I agree this seems extremely slow---not just lang/rust but other compilers like gcc* and llvm*.  It's a mystery to me that I can rebuild the entire FreeBSD source tree (which includes some flavour of llvm) in at least half the time (or less) it takes to build just a single llvm* port. =:-O

I guess the OS build includes various build-time optimisations, so I, too, would be interested in knowing if there is some way of speeding up ports builds of rust, gcc*, and llvm*.

Cheers,

Paul.