What is erdma as illustrated by Coptic cartoon?

In a leading Alibaba Cloud Data Center , Hundreds of servers （ That is, large computers ） In crazy work and communication , They are working together to complete a large-scale big data processing task , Each server receives its own small task , After the calculation , We have to synchronize the results with each other , Calculate the next step .

There is also a small team in each server ,CPU、 Memory 、 network card , Each has its own division of labor .

But this seemingly perfect system , There seems to be some disharmony . Small server C I work very slowly , Like the short board of a barrel, it slows down the team , This causes the server to be small A The curious .

In small C In the world of （ Use the universal TCP/IP agreement ）： Data from a server , When it is transferred to another server , All of them are transferred to... Through memory CPU,CPU After packing , Forward to the network card , The other party will unpack .

RDMA Technology is a network acceleration technology , It transfers data directly from one computer's memory to another . This enables high throughput 、 Low latency network communication , Especially suitable for large-scale parallel computer cluster

. Due to different transmission protocols ,RDMA Special network cards, switches and other expensive equipment are required .

That's all , Small A Look back , Find the little C It's long gone , Small A Want to , May be small C Go to find its dragon architecture ……

finally , Entire data center , It's all in eRDMA The new age .

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