The general answer is that it depends. Here I'm constraining my answer to released products.
What do you mean with mine? Are you trying to do some analysis directly via the data access options? What analysis?
For the more general answer:
If you are developing for the JVM, then you might want to consider the PI JDBC.
For a "wget url" approach, you might be able to work something out with PI WebServices.
Options other than out of the box:
You could also try a linked server approach via PI OLEDB and MS SQL if you have it somewhere. From that you could create various views, stored procedures etc. and hit them via regular ODBC.
Alternative, you could consider writing a web service on a Windows box and then hitting that from your Linux box. From the Windows box you would potentially have access to all data access options.
As far as I am currently aware of, the currently released data access options targeting Linux are the first two I just mentioned.
Which PI System Access tool would be the most performant to retrieve time-series compressed data from a tag in a Linux environment? Would the PI API also be an option if the application already exist on an OpenVMS and already uses the PI API, so that the conversion process would be easier?
@Louis-Philippe: PI API is pretty old and not open to use by everyone. In terms of solutions, you would have PI JDBC, or PI Web Services, or the new PI Web API (presented last week in a webinar).
Could you define the performance that would be needed for the Linux application?
The PI-API for Linux is not available for use in applications like these. Rather consider one of the supported PI Data Access components.
JDBC and OData would seem to be the best selection for Linux platform. Have you considered adapting your existing PI-API calling applications to use web services instead?
Here is also a KB article that goes into more specifics about the features of our PI Data Access Products.
Also, OData is actually an add-in to the PI Web API which is currently a CTP release. You can find more information here.