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4.096 μs×2timeout4.096\ \mu s \times 2^{\text{timeout}}

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NCCLAL_ALGO and NCCLPL_PROTO select which collective algorithm and wire protocol a given operation uses; NCCLIL_IBHB_HCA filters which InfiniBand host channel adapters, ports and rails are eligible for a job, in a format that can descend to individual rail and plane; NCCLSL_SOCKETIT_IFNAME performs the equivalent filtering for the out-of-band control interfaces [ 1 ] . On the InfiniBand transport specifically, NCCLIL_IBTB_TIMEOUT sets the retransmission timeout as 4.096\ μ\mu s ×\times 2^{timeout\text{timeout}} , with the library’s own default raised to 20 as of version 2.23, and NCCLIL_IBRB_RETRYCY_CNT defaults to seven retry attempts before a queue pair gives up [ 1 ] — both are tuned upward on fabrics with longer…

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μ\mu

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ss

Symbol s

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4.096 μs×2timeout4.096\ \mu s \times 2^{\text{timeout}}

Equation 1 · Datacenters

AI Datacenter Interconnects in Practice: An Advanced Technical Guide

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

NCCLAL_ALGO and NCCLPL_PROTO select which collective algorithm and wire protocol a given operation uses; NCCLIL_IBHB_HCA filters which InfiniBand host channel adapters, ports and rails are eligible for a job, in a format that can descend to individual rail and plane; NCCLSL_SOCKETIT_IFNAME performs the equivalent filtering for the out-of-band control interfaces [ 1 ] . On the InfiniBand transport specifically, NCCLIL_IBTB_TIMEOUT sets the retransmission timeout as 4.096\ μ\mu s ×\times 2^{timeout\text{timeout}} , with the library’s own default raised to 20 as of version 2.23, and NCCLIL_IBRB_RETRYCY_CNT defaults to seven retry attempts before a queue pair gives up [ 1 ] — both are tuned upward on fabrics with longer…

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