Enhanced virtual channel switching

A non-transitory computer-readable storage medium storing instructions that when executed by a computer cause the computer to perform a method, the method comprising:

• allocating, from a node of a distributed computing environment, flow control credits for a first virtual channel to an upstream node in the distributed computing environment;
• receiving, via a message path comprising the upstream node, a message on the first virtual channel based on the allocated flow control credits;
• storing the message in a queue associated with an input port at which the message has been received;
• determining whether the message is a candidate for changing the first virtual channel to a different channel at the node based on a mapping rule associated with the input port;
• in response to the message being a candidate, selecting a second virtual channel for the message based on the mapping rule and the first virtual channel;
• associating the message with the second virtual channel in the queue;
• determining that the first virtual channel is an ingress virtual channel for the message based on metadata stored in the queue in association with the message;
• and
• sending the message from the queue on the second virtual channel based on flow control credits for the second virtual channel.

A computer system, comprising:

• a processor;
• an egress logic block to allocate, from the computer system, flow control credits for a first virtual channel to an upstream node in the distributed computing environment;
• an ingress logic block to:
• receive, via a message path comprising the upstream node, a message on the first virtual channel based on the allocated flow control credits;
• and
• store the message in a queue associated with an input port at which the message has been received;
• a remapping logic block to:
• determine whether the message is a candidate for changing the first virtual channel to a different channel at the node based on a mapping rule associated with the input port;
• in response to the message being a candidate, select a second virtual channel for the message based on the mapping rule and the first virtual channel;
• associate the message with the second virtual channel in the queue;
• and
• determine that the first virtual channel is an ingress virtual channel for the message based on metadata stored in the queue in association with the message;
• and
• wherein the egress logic block is further to send the message from the queue on the second virtual channel based on flow control credits for the second virtual channel.