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

Figure 11.

Figure 11

Comparison of simulation times Tsim for excitatory-inhibitory networks with different implementations of the Urbanczik-Senn plasticity in NEST. The following implementations are shown: “stdp”: standard implementation of STDP synapse in NEST, “td”: time-driven implementation of Urbanczik-Senn synapse, “ed”: event-driven scheme, edc”: event-driven compression. (A) Network of size N = 3.84 · 105 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 = 3.84 · 104 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 the 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. Details on network parameters in Supplementary Table 5.