Hi,
If I'm using, say TCP, is 0MQ really able to guarantee zero-copy message
transmission? (As an anecdote, somebody once told me that the 0 in 0MQ
means zero-copy. I don't know if this is true or not.) I recall reading
from some article that an OS/kernel/driver internally copies (possibly
multiple times) whatever data is given to it through its TCP API.
Wouldn't a zero-copy messaging system need to bypass the OS TCP/IP
stack? I think if we're relying on an operating system, then zero-copy
at userland is the best we could hope for.
I see that there are some threads on RDMA. Wikipedia suggests that RDMA
might be able to deliver a true zero-copy solution. On the other hand,
I've been told that RDMA can be both a safety and a security risk not to
mention that it's hard to use right. Using RDMA might not be worth the
risk and effort for most applications. I'm not requesting RDMA support,
I'm just curious about the concept of zero-copy...
Cheers,
John
_______________________________________________
zeromq-dev mailing list
[email protected]
https://lists.zeromq.org/mailman/listinfo/zeromq-dev
