Performance tuning Linux plotting

[ilyakooo0]

When plotting I would have expected the CPU usage to be more or less constant. In reality, it is really sporadic and spikey.

The only thing running on the machine is a chia full node, wallet, and two plotters. The node is fully synced and doesn't affect performance in any significant way.

The CPU usage of the two running plotters seems to spike at the exact same time leading me to suspect that it is related to some resource being released, and the two plotters racing to deplete it, but I couldn't figure out what.

The IO scheduler is already set to noop. I have already tried tweaking parameters like dirty_background_ratio and dirty_ratio, but it doesn't seem to help.

Am I doing something wrong? Do I have something set up in a suboptimal way? Any pointers would be welcome.

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Running Ubuntu 21.04
32 GB RAM
1 TB M.2 NVME SSD