post your build times and specs

[myga]

Hello,

***Disclaimer: this post is just to chat about packages' build time and collect information that might help others searching for it.***

I know that the wiki provide some hints about build times and RAM needed for them, but that info is not applicable to everyone and might be outdated. So, I starter searching around for anyone posting or blogging about any packages' build time and the specs used, but there is none. I was hesitant for awhile to build big packages, but today I decided to test my machine by building thunderbird and I expected it to take about 3 hrs. However, it took a lot less than that!

So, I'm hoping that you guys participate by posting your build times and specs for anyone seeking a general idea about their hardware and its capabilities.

Here are the build times of thunderbird & friends, and specs of my machine:

[rfx]

[eeckwrk99]

- CPU: Intel i7-5820K (12) @ 3.80 GHz
- RAM: 32 GB
- COMMON_FLAGS="-march=haswell -O2 -pipe"
- CPU_FLAGS_X86="aes avx avx2 f16c fma3 mmx mmxext pclmul popcnt rdrand sse sse2 sse3 sse4_1 sse4_2 ssse3"
-j12 -l10.8

[NeddySeagoon]

[apiaio]

[myga]

[gorg86]

It's always interesting to see compile times of big packages on different machines, but I'd suggest adding at least LTO and PGO useflags, too.

[NeddySeagoon]

myga,

It never goes over a CPU temp of 60C.

gorg86,

PGO will at least double the build time as the package will be built twice.
LTO will drive a lot more swapping as its a memory hog.

I do use LTO on my Pi4 build system (with 128G RAM) but it won't run code built for the Pi5 which makes building Pi5 optimised code a bit tedious.

All the Pi5 code on my binhost is actually built on the Pi5 just now.
distcc would help a bit, maybe, but that's a double edged sword.

The rest, is Pi4 optimised with LTO but not PGO.

[mss]

I used Gentoo for ~5 years, and it was the first OS I installed on my last computer: https://www.cpubenchmark.net/compare/4814vs1920/AMD-Ryzen-7-5700X-vs-AMD-A10-5750M-APU

That machine was my daily driver for ten years, up until last week. I had been using OpenBSD for awhile, but switched back to Linux for the hardware support, and so Gentoo is the first install on this machine as well. The specs:

Ryzen 7 5700X
32x2 GB @ 3600
Radeon RX 6600 (8 GB VRAM)

As for build times, my old machine took several hours to build Rust, Clang, GHC, etc. As the benchmark numbers suggest, builds are ~14 times faster on this machine.

I think the increases in build time are because I added the LTO and vectorization flags a few days ago.

[greyspoke]

[eccerr0r]

[myga]

[eccerr0r]

My Pentium-M 1.6GHz (1.5GiB RAM) and Atom N270 (2GiB RAM) haven't quite reached their Gentoo refresh cycle yet... For kicks I tend to update them (both 32 bit) to latest about once a year. The N270 with distcc help still takes 5 days 24h/day compiling, and the Pentium-M is not far behind - both building firefox and its dependencies...

Luckily I really don't need these machines up so they can just build in the background.

Incidentally I've had LTO going for rust and I had the rust RSS go to almost 7GiB.

My A6-3420 (quad core):

2023-11-04T02:48:08 >>> dev-lang/rust-1.71.1: 3:14:27

It only has 7.5GiB RAM because 512MB is swallowed up by the on-die graphics (wish I could reduce it, I don't do graphics that much on this machine. Can't wait until I could do open CL on it so that 512MB could actually be useful...) Again this is with distcc help... My dual core i5-3317 with 16GiB RAM actually was significantly faster (about 2 hours) probably because of the lack of need to swap, I figure.
_________________
Intel Core i7 2700K/Radeon R7 250/24GB DDR3/256GB SSD
What am I supposed watching?

[krumpf]

Last summer I changed CPU from a Ryzen 3600 (6C/12T - 3.6 to 4.2 GHz) to a Ryzen 5700X (8C/16T - 3.4 to 4.6 GHz), here are a few qlop stats :

Firefox (with USE=lto)
Ryzen 3600 (-j12)

[rfx]

@krumpf thank you, the comparison of the two CPU's with differenct Cores was very interesting, even if a different gcc and kernelversion also impact on build times.

Here my little workstation:

[Spanik]

The only ones I find that have already passed here:

[myga]

Today I realized that www-client/thunderbird was built with clang USE FLAG and caused a build error. I removed it and emerged again and it looks it took longer to build this time.

[eccerr0r]

More Atom 1.6GHz (N270 i686 1C2T, 2GiB RAM, mPCIe SSD):

2023-07-25T06:42:38 >>> sys-devel/gcc-12.3.1_p20230526: 17:44:15
2023-07-26T11:12:24 >>> dev-lang/rust-1.69.0-r1: 15:57:01
2022-08-30T02:50:57 >>> dev-util/cbindgen-0.24.3: 38′15″
2023-07-27T20:38:35 >>> gnome-base/librsvg-2.56.0: 1:15:42

I would hope these are not as corrupted by distcc but they may well still be due to --jobs ...
_________________
Intel Core i7 2700K/Radeon R7 250/24GB DDR3/256GB SSD
What am I supposed watching?

[sdauth]

A funny one (A106800K @ 4.1Ghz Piledriver)

[myga]

[superjaded]

[mid-kid]

I suggest using a command like:

[eeckwrk99]

[DavidF]

[pietinger]

DavidF,

do you have running many other tasks when you do your emerge world ?

I have also an i9-13900K - using only -j24 (instead of possible -j32 ... because of CPU heat) =>