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According to the Raspberry Pi 4 Model B specs the SoC used is BCM2711. The BCM2711 uses an ARM Cortex-A72 core. Does this have simultaneous multi-threading (SMT), like Intel cores with hyperthreading? I have read somewhere that some newer ARM processors do.
Related: software threads vs hardware threads
I'm putting together a Raspberry Pi 4 cluster and had the same question (I need a particular minimum of hardware threads). Although there was no answer here, the question was answered in the comments, so for future visitors I'll summarize it:
The Raspberry Pi 4 does not have simultaneous multithreading ("SMT") hardware. Each of its four cores can only run one thread at a time. That said, each core will switch between (software) threads hundreds or thousands of times a second, so like any Intel- or AMD-based system it can still handle many threads "at once," from a human perspective.
