Logical Processor Index Meaning | Generated by AI
Question: What does “12 (AMD EPYC 7443 24-Core Processor)” mean?
Answer: That’s a line from /proc/cpuinfo or lscpu -e — 12 is the logical processor index (0-based), and the string is the model name field for that logical CPU.
# see it yourself
grep -A0 "^processor\|^model name" /proc/cpuinfo | head -30
# or cleaner
lscpu -e
Context on the EPYC 7443:
- 24 physical cores / 48 threads (SMT2) — Zen 3, 7nm
- Base clock 2.85 GHz, boost 4.0 GHz
- 128 MB L3 cache
- 8 CCDs disabled down to fewer… actually 7443 has 4 CCDs × 6 cores, 32MB L3 per CCD region shared
- TDP 200W, PCIe 4.0, 8-channel DDR4-3200
So processor index 12 is just the 13th logical CPU (thread) on that socket — with SMT on, cores 0–23 map to physical cores 0–23 and 24–47 are their sibling threads (or interleaved, depends on topology — check lscpu -e for the actual CORE column to see which physical core owns thread 12).
If you’re pinning training/inference workloads, useful command:
lscpu -e=CPU,CORE,SOCKET,ONLINE
numactl --hardware # check NUMA node mapping before pinning threads
7443 is a solid CPU for host-side dataloading / preprocessing alongside MI300X — just make sure you pin dataloader workers to cores on the same NUMA node as the GPU’s PCIe root complex to avoid cross-node memory traffic.
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