I just wanted to point out that GNU parallel has built-in options to do the same thing when running parallel processes that could possibly overwhelm the compute

I just wanted to point out that GNU parallel has built-in options to do the same thing when running parallel processes that could possibly overwhelm the computer. --memfree size Minimum memory free when starting another job. The size can be postfixed with K, M, G, T, P, k, m, g, t, or p (see UNIT PREFIX).