perfSONAR User Q&A and Other Discussion

[Andrew Lake <>]

All,

This is another reminder that in one week on April 17th we will be releasing the final version perfSONAR 4.0. We’d like to reiterate the important upgrade notes we shared last week below:

The release will be made available as an auto-update. The auto-update process we have in place will preserve all your existing data and measurements. It will also still allow you to test with people running versions of the code before 4.0 and vice versa. Our goal is that for most of you this should be a seamless transition in spite of the large changes “under-the-hood". 

One area we want to highlight though is that hardware requirements have shifted slightly in this release, especially pertaining to CPU, so for some disabling auto-updates of the perfSONAR packages may be the best course of action. We recommend you keep auto-updates of any non-perfSONAR packages enabled so you can still get important security updates. See http://docs.perfsonar.net/release_candidates/4.0rc3/manage_update.html#disabling-automatic-updates-for-perfsonar-packages for instructions on how to diable perfSONAR auto-updates. Our recommendations for deciding how to approach auto-updates are as follows:

 

- If you have a single-core CPU, we recommend disabling auto-updates. Our testing shows that the combination of running CPU intensive throughput tests and/or OWAMP tests with high write activity to the measurement archive on top of the new scheduling system does not perform as desired beyond more than a few tests. Such a setup may be fine if you plan to use it as an ad-hoc tester as opposed to for use with dedicated measurements.  It is worth noting here that this is below the minimum recommendations for 3.5.

- If your host has a CPU with two cores but the clock speed is below 2GHz or less than 4 GB of RAM, we recommend using your best judgement. If you are running a couple dozen tests or less you are likely fine with regards to CPU. 4GB has been the memory recommendation for many years on the toolkit, and if you are below that and running a bundle without the measurement archive you may be fine as well. If you are running on less than 4GB with a local measurement archive, we encourage you to add memory or disable auto-updates (and we would have recommended this the last few releases as well).

- If your host has a CPU with at least 2 cores, a clock speed of at least 2 GHz and 4GB memory, you should be good, no action is needed. We recommend keeping auto-updates on in this case.

 

If your hardware is up to specification, but you would be more comfortable disabling auto-updates for the time-being you are free to do so as well. Please feel free send us any questions in the meantime.

Thank you!

The perfSONAR Development Team