Hi, Thank you for reply! My numbers are different may be because I am executing MPJ Express (pure Java MPJ) over SDP. However now I need to implement code in C now (natively). Any documentation that I may be able to use for programming MPI using C Sockets and SDP?
Thanks On Thu, Jun 11, 2009 at 11:22 AM, Amir Vadai <[email protected]> wrote: > Hi Zafar, > > I am the maintainer of SDP in OFED. > > The current SDP implementation does not have ZCopy. What we have is BCopy > and something that we call BZcopy. > Small packets (<=32k) are sent using BCopy - meaning the SEND verb is in > use and data is not zero copied. > Packets bigger than 32K are sent using BZcopy - they are also sent using > the SEND verb but they are zero copied on the sender side. on the RX side > packets are memcpy'ed. > When we implement ZCopy it will be automatic too - when sending packets > bigger than a threshold the driver will automatically use RDMA verb instead > of the SEND. > > BTW, your numbers are different that what we measured. See attached. Was > measured on a high end host using QDR IB PCI gen 2 and Mellanox ofed 1.4. > > - Amir > Zafar
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