Network stress test. Post: 303027026

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Top Forums UNIX for Beginners Questions & Answers Network stress test. Post 303027026 by MuntyScrunt on Friday 7th of December 2018 07:51:36 AM

12-07-2018

Registered User

Network stress test.

Hi there.

First things first, this is nothing to do with the internet or ISP speed, I know what that is, I know what it's doing.

I have a cluster of 128 single board computers running a branch of Debian. I want to run some kind of stress test to ensure they can transfer data (a) to each other and (b) to NAS drives efficiently. These nodes are connected by stacked switches with fibre and lag trunks.

I've tried using the various 'tops available, but there's nothing that will give me (without a load of work) stats from each node point to point.

I could write some python and test the timing of file transfers, socket transfers etc, but I'll end up with a bunch of numbers without any reference.

Can anyone suggest a known 'top, software or service that can stress test the network and give me stats, bottlenecks and where there may be unused bandwidth?

The major caveat, this has to be free or very low cost.

Thanks folks.

MuntyScrunt

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LEARN ABOUT CENTOS

ucmatose

UCMATOSE(1)							     librdmacm							       UCMATOSE(1)

NAME

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

SYNOPSIS

       ucmatose [-s server_address] [-b bind_address] [-c connections]
		 [-C message_count] [-S message_size]
       ucmatose -s server_address [-b bind_address] [-c connections]
		 [-C message_count] [-S message_size] [-t tos]

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.

       -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 configura-
	      tion.

       -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), udaddy(1), mckey(1), rping(1)

librdmacm							    2007-05-15							       UCMATOSE(1)