---
name: "ucmatose"
section: "1"
platform: "linux"
package: "rdma-core"
version: "65.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/ucmatose"
---

# ucmatose(1)

RDMA CM connection and simple ping-pong test.

## NAME

ucmatose - RDMA CM connection and simple ping-pong test.

## SYNOPSIS

```
ucmatose [-s server_address] [-b bind_address]
		[-f address_format] [-P port_space]
		[-c connections] [-C message_count] [-S message_size] [-a ack_timeout]
ucmatose -s server_address [-b bind_address]
		[-f address_format] [-P port_space]
		[-c connections] [-C message_count] [-S message_size] [-t tos] [-a ack_timeout]
```

## DESCRIPTION

Establishes a set of reliable RDMA connections between two nodes using the librdmacm, optionally transfers data between the nodes, then disconnects.

## OPTIONS

- \-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. To bind to any address with IPv6 use -b ::0 .

- \-f address\_format

  Specifies the format of the server and bind address.  Be default, the format is determined by getaddrinfo() as either being a hostname, an IPv4 address, or an IPv6 address.  This option may be used to indicate that a specific address format has been provided.  Supported address\_format values are: name, ip, ipv6, and gid.

- \-P port\_space

  Specifies the port space for the connection.  Be default, the port space is the RDMA TCP port space. (Note that the RDMA port space may be separate from that used for IP.)  Supported port\_space values are: tcp and ib.

- \-c connections

  The number of connections to establish between the client and server. (default 1)

- \-C message\_count

  The number of messages to transfer over each connection.  (default 10)

- \-S message\_size

  The size of each message transferred, in bytes.  (default 100)

- \-t tos

  Indicates the type of service used for the communication.  Type of service is implementation dependent based on subnet configuration.

- \-a ack\_timeout

  Indicates the QP ACK timeout value that should be used. The value calculated according to the formula 4.096 \* 2^(ack\_timeout) usec.

- \-m

  Tests event channel migration.  Migrates all communication identifiers to a different event channel for disconnect events.

## NOTES

Basic usage is to start ucmatose on a server system, then run ucmatose -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

[rdma\_cm(7)](/rdma_cm/7.md), [udaddy(1)](/udaddy/1.md), [mckey(1)](/mckey/1.md), [rping(1)](/rping/1.md)