On 2025-Jun-25, Tomas Vondra wrote: > Not sure. I thought NUMA doesn't matter very much on 32-bit systems too, > exactly because those systems tend to use small amounts of memory. But > then while investigating this issue I realized even rpi5 has NUMA, in > fact it has a whopping 8 nodes: > > debian@raspberry-32:~ $ numactl --hardware > available: 8 nodes (0-7)
Interesting. Mine only shows a single node. alvherre@amras:~ $ uname -a Linux amras 6.12.25+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.12.25-1+rpt1 (2025-04-30) aarch64 GNU/Linux alvherre@amras:~ $ sudo numactl --hardware available: 1 nodes (0) node 0 cpus: 0 1 2 3 node 0 size: 8051 MB node 0 free: 202 MB node distances: node 0 0: 10 alvherre@amras:~ $ sudo lscpu Architecture: aarch64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 4 On-line CPU(s) list: 0-3 Vendor ID: ARM Model name: Cortex-A76 Model: 1 Thread(s) per core: 1 Core(s) per cluster: 4 Socket(s): - Cluster(s): 1 Stepping: r4p1 CPU(s) scaling MHz: 62% CPU max MHz: 2400.0000 CPU min MHz: 1500.0000 BogoMIPS: 108.00 Flags: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp [...] NUMA: NUMA node(s): 1 NUMA node0 CPU(s): 0-3 Did you enable something special on it maybe? ... Oh, I found this: https://www.jeffgeerling.com/blog/2024/numa-emulation-speeds-pi-5-and-other-improvements Sounds like you have this in your system and I don't in mine. -- Álvaro Herrera PostgreSQL Developer — https://www.EnterpriseDB.com/