| Headlines |
| 2024-02-22 |
Red Hat testing x86-64-v3 for performance optimizations |
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Red Hat announced earlier this year the company was looking at upgrading the CPU requirements for their next major release of Red Hat Enterprise Linux, which would be version 10. At the time some testing was being done within CentOS to test performance differences between x86-64-v2 (which was already in use) and x86-64-v3. "The CentOS ISA SIG has produced rebuilds of CentOS 9 with x86-64-v2 and x86-64-v3 baselines, after upgrading the system compiler to GCC 12. As mentioned above, GCC 11, the RHEL 9 system compiler, does not support auto-vectorization at -O2, which is why we switched to GCC 12 for these rebuilds. For this experiment, GCC 12 is still reasonably close to GCC 11 in terms of bug-for-bug C++ compatibility, so that few packages needed fixing before they could be rebuilt. We hope that these builds can be used to show performance improvements for key packages and workloads. Even if we cannot show performance improvements for software included in RHEL, it may still make sense to go ahead with the switch. The reason is that if RHEL 10 requires the x86-64-v3 baseline, ISVs will be able to rely on it, too. This reduces maintenance cost for some ISVs because they no longer need to maintain (and test) AVX and non-AVX code paths in their manually tuned software." The proposal for updating to x86-64-v3 may be going ahead as at least one tester of CentOS Stream has found development snapshots now require a CPU which supports x86-64-v3, blocking older processors from running the distribution. |
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