Process Limitation with ssh

2 – InfiniPath Cluster Administration Performance and Management Tips

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Change the file to mode 600 when finished editing.

4.On each node, the system file /etc/ssh/sshd_config must be edited, so that the following four lines uncommented (no # at the start of the line) and are set to yes. Each of these lines is normally present, but commented out and set to no by default.

RhostsAuthentication yes RhostsRSAAuthentication yes HostbasedAuthentication yes PAMAuthenticationViaKbdInt yes

5.After creating or editing these three files in steps 2, 3 and 4, sshd must be restarted on each system. If you are already logged in via ssh (or any other user is logged in via ssh), their sessions or programs will be terminated, so do this only on idle nodes. Tell sshd to use the new configuration files by typing (as root):

# killall -HUP sshd

NOTE: This will terminate all ssh sessions into that system. Run from the console, or have a way to log into the console in case of any problem.

At this point, any user should be able to login to the ip-fefront end system, and then use ssh to login to any InfiniPath node without being prompted for a password or pass phrase.

2.9.1

MPI jobs that use more than 8 processes per node may encounter an SSH throttling mechanism that limits the amount of concurrent per-node connections to 10. If you need to use more processes, you or your system administrator should increase the value of ’MaxStartups’ in your sshd configurations. See appendix C.8.8 for an example of an error message associated with this limitation.

2.10

Performance and Management Tips

The following section gives some suggestions for improving performance and simplifying management of the cluster.

2.10.1

Remove Unneeded Services

An important step that the cluster administrator can take to enhance application performance is to minimize the set of system services running on the compute

IB6054601-00 D

2-17

IB6054601-00 D specifications

The Q-Logic IB6054601-00 D is a high-performance InfiniBand adapter card designed for data centers and enterprise applications requiring robust connectivity and low-latency communication. This adapter is part of QLogic's extensive portfolio of networking solutions, catering to the needs of high-performance computing (HPC), cloud computing, and virtualization environments.

One of the standout features of the IB6054601-00 D is its capability to support data transfer rates of up to 56 Gbps. This makes it ideal for applications demanding large bandwidth and quick data processing. The adapter is optimized for RDMA (Remote Direct Memory Access) technology, which allows data to be transferred directly between the memory of different computers without involving the CPU. This reduces latency and CPU overhead, leading to enhanced overall system performance.

The architecture of the IB6054601-00 D includes support for a dual-port design, which offers increased bandwidth, redundancy, and fault tolerance. This dual-port configuration is especially advantageous for environments that require high availability and reliability, such as financial services and mission-critical applications.

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Overall, the Q-Logic IB6054601-00 D stands out for its high throughput, low latency, and reliability. Its combination of advanced features and technologies positions it as an excellent choice for organizations looking to enhance their data center performance and maximize the efficiency of their network infrastructure. With the growing demands for faster and more efficient data transfer, solutions like the IB6054601-00 D are essential in meeting the evolving needs of modern enterprises.

Q-Logic IB6054601-00 D manual Process Limitation with ssh, Performance and Management Tips

Models: IB6054601-00 D

# killall -HUP sshd