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. 2021 Jun 10;15:609147. doi: 10.3389/fninf.2021.609147

Figure 9.

Figure 9

Comparison of simulation times Tsim for excitatory-inhibitory networks with different implementations of the Clopath plasticity in NEST. Simulation times exclude network building and only account for updates of the dynamical state of the system. The following implementations are shown: “stdp”: standard implementation of STDP synapse, “td”: time-driven implementation of Clopath synapse, “ed”: event-driven scheme as included in NEST 2.20.1, “edc”: event-driven compression. (A) Network of size N = 1.92 · 106 with small in-degree K = 100 and all synapses having a delay d equal to the resolution of the simulation h = 0.1 ms. (B) Network of size N = 1.54 · 105 with large in-degree K = 5, 000 and d = h. (C) Same network as in (B) but d = 1.5 ms (for d > h “edc” not compatible with NEST, see section 3.1.3). In (A–C) both “ed” and “edc” use linear search of the history and access counters, see Appendix Section 5.3. (D) Comparison between “ed”-implementations using linear search and direct computation of the position, see Appendix Section 5.3.0.2. All simulations use 768 threads distributed over 32 compute nodes each running one MPI process. Further parameters as in Supplementary Table 5.