How fast is the Pouta network?

The network is a mix of 40 Gb/s and 10 Gb/s Ethernet. Machines launched using HPC flavors will have 40 Gb/s network access while standard flavors will have 10 Gb/s. For more information, see the chapter about virtual machine flavors: Virtual machine flavors and quotas

Some limitations are imposed by virtualisation:

• For intra node and external connectivity some overhead is introduced because of virtualization. This will impact latency and bandwidth, but we have no benchmark data to share at this time.
• Applications sensitive to network latency may perform significantly worse than using a cluster (like Puhti) natively.
• Overhead is introduced by the necessity to use Ethernet for virtual machine connectivity and compatibility.

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