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The EXTOLL network technology serves as a homogeneous high-performance interconnect network for both the Cluster and Booster part of the DEEP-ER system.


EXTOLL’s 65nm ASIC TOURMALET mounted on a PCI-express gen3 x16 plug-in card is the network interface controller (NIC). It enables high bandwidth, extremely low latency and ultra-high message rate. Furthermore, an efficient interface to the Network Attached Memory (NAM) devices developed in DEEP-ER is implemented.

Benefits of the EXTOLL network technology for the DEEP-ER architecture

The EXTOLL network is a direct network, i.e. no central switches are required. This reduces the total cost of ownership (TOC) and avoids performance degradation by such central components. Finally, EXTOLL networks scale linearly in terms of costs and allow scaling the network size by an increment of 1.

EXTOLL Hardware Architecture


The network interface provides six bi-directional links,  each yielding 100 Gbit/s per direction at an ultra-low MPI end-to-end latency of 0.8μs. On top, it offers a hardware message rate of more than 100 million messages/s, and highly efficient remote memory access functionality. The network supports point-to-point as well as multi-cast routing, each of which can be deterministic or adaptive


The network supports point-to-point as well as multi-cast routing, which may be deterministic or adaptive. Any network topology with a radix of 6 or less can be wired – in a co-design exercise with the applications, DEEP-ER decided to use a 6×3×4 torus with wrap-around in the X and Z directions. The Booster is connected to the Cluster side using nine connections.

More information about the EXTOLL network technology is available on the EXTOLL website: www.extoll.de