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spf=pass (aspmx1.migadu.com: domain of bug-guix-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=bug-guix-bounces@gnu.org X-Migadu-Queue-Id: AEDB84A71 X-Spam-Score: -1.96 X-Migadu-Scanner: scn0.migadu.com X-TUID: sIPo8pI9BUFz Hi Maxim, On Mon, 1 Nov 2021 at 04:08, Maxim Cournoyer wrote: > Our OpenBLAS package uses DYNAMIC_ARCH=1 to provide optimizations for > all supported targets, at least of x86 and x86_64. In theory that seems > OK, but in practice the builds differ depending on the host CPU. > > I've made a build on an old Core2 CPU (Q6700), and another one on > Berlin. I've run diffoscope on the result, and got tons of differences; > here's the tail of the diffoscope output: Well, it rings this bell [1] and this one [2] too. ;-) Maybe I am wrong, but speaking about HPC, it seems expected that the builds differ depending on the host CPU and I am not convinced we can do better than DYNAMIC_ARCH=1 for performances which somehow sacrifice reproducibility, IIUC. 1: 2: Cheers, simon