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4 GPUs, 2x speed: why PyTorch DDP stalled on a PCIe-only 4x RTX A6000, and two flags that took it to 3.6x

Four GPUs should train about four times faster than one. On a rented 4x RTX A6000 machine this morning (2026-10-26), plain PyTorch DDP gave me 2x. This is the notebook of finding out why, and the two flags that took it to 3.6x. Setup Machine: one Runcrate 4x RTX A6000 (48 GB each) VM, US Midwest, $…

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  1. 2026-10-26 09:22 · DEV Community — Machine Learning
    4 GPUs, 2x speed: why PyTorch DDP stalled on a PCIe-only 4x RTX A6000, and two flags that took it to 3.6x

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