Habitat-Sim only utilizes first 64 logical CPUs

[yichenzeng24]

Habitat-Sim version

v0.2.2

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Docs and Tutorials

Did you read the docs? https://aihabitat.org/docs/habitat-sim/

Did you check out the tutorials? https://aihabitat.org/tutorial/2020/

Perhaps your question is answered there. If not, carry on!

❓ Questions and Help

I'm using habitat-sim==v0.2.2 to perform audio simulations (using the integrated acoustic simulation in SoundSpaces pipeline). However, the simulation is very CPU-intensive, and I want to accelerate it using all available CPU threads on my server.

No matter what I try, Habitat-Sim never uses more than 50% CPU. I opened htop and observed that the process only uses logical CPUs 0-63. The other half (64-127) is completely idle.

I tried the following:
taskset -c 0-127 python my_script.py
taskset -c 64-127 python my_script.py
numactl --physcpubind=0-127 --interleave=all python my_script.py
But Habitat-Sim still only utilizes cores 0–63. Even when I restrict it to 64-127 via taskset, it still spawns threads on 0–63 only.

Platform: Dual-socket server, 2 CPUs, each with 32 cores / 64 threads (total 128 logical cores)
NUMA layout:
NUMA node(s): 2
NUMA node0 CPU(s): 0-31,64-95
NUMA node1 CPU(s): 32-63,96-127

How can I configure Habitat-Sim to utilize all 128 logical CPUs (0–127) across both NUMA nodes for audio simulation?