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Table 1 Memory requirements per particle

From: PKDGRAV3: beyond trillion particle cosmological simulations for the next era of galaxy surveys

Persistent 28 bytes Ephemeral 0-8 bytes Tree 25 bytes Buffers \({\sim}5~\mbox{bytes}\)
Buffers are \(\mathcal{O}(125~\mbox{MB})\) per thread. Here we assume 16 threads with \(\mathbf{5} \boldsymbol{\times} \mathbf{10}^{\mathbf{8}}\) particles on a 32 GB node.