CMTIME(1)                         librdmacm                        CMTIME(1)

NAME         top

       cmtime - RDMA CM connection steps timing test.

SYNOPSIS         top

       cmtime [-s server_address] [-b bind_address]
                      [-c connections] [-p port_number]
                      [-r retries] [-t timeout_ms]

DESCRIPTION         top

       Determines min and max times for various "steps" in RDMA CM
       connection setup and teardown between a client and server

       "Steps" that are timed are: create id, bind address, resolve address,
       resolve route, create qp, connect, disconnect, and destroy.

OPTIONS         top

       -s server_address
              The network name or IP address of the server system listening
              for connections.  The used name or address must route over an
              RDMA device.  This option must be specified by the client.

       -b bind_address
              The local network address to bind to.

       -c connections
              The number of connections to establish between the client and
              server.  (default 100)

       -p port_number
              The server's port number.

       -r retries
              Number of retries when resolving address or route.  (default

       -t timeout_ms
              Timeout in millseconds (ms) when resolving address or route.
              (default 2000 - 2 seconds)

NOTES         top

       Basic usage is to start cmtime on a server system, then run cmtime -s
       server_name on a client system.

       Because this test maps RDMA resources to userspace, users must ensure
       that they have available system resources and permissions.  See the
       libibverbs README file for additional details.

SEE ALSO         top


COLOPHON         top

       This page is part of the rdma-core (RDMA Core Userspace Libraries and
       Daemons) project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug report
       for this manual page, send it to  This
       page was obtained from the project's upstream Git repository
       ⟨⟩ on 2020-02-08.  (At
       that time, the date of the most recent commit that was found in the
       repository was 2020-02-07.)  If you discover any rendering problems
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librdmacm                        2017-04-28                        CMTIME(1)