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Subject: [OMPI users] questions about the openib component
From: ºî½Ü (hjieboy85_at_[hidden])
Date: 2010-12-08 10:59:01


Dear all,

Now I am studying the openib component, and I find it is really complicated. Here I have one question to ask, it is as follows:

In the initialization of openib component, the function named setup_qps() is used. In this function, the following code segments are written:
    mca_btl_openib_component.num_pp_qps = num_pp_qps;
    mca_btl_openib_component.num_srq_qps = num_srq_qps;
    mca_btl_openib_component.num_xrc_qps = num_xrc_qps;
    mca_btl_openib_component.num_qps = num_pp_qps + num_srq_qps + num_xrc_qps;
if you run the program in the step way, you will find that at last the value of mca_btl_openib_component.num_qps is 4( the value of num_pp_qps is 1, and the value of num_srq_qps is 3). Can someone explain me why 4 QPs(1 normal QP, 3 SRQ QPs) need to be created?

Have a nice day!
Thanks very much!

best regards,
Jie