Hi,

I have some good news.

I've been able to put together a platform for running the HPS recon in parallel from the ET system.

The module is here on the iss495 branch:

https://github.com/JeffersonLab/hps-java/tree/iss495

It works using a simple client-server architecture.  A server would run on each machine where the recon should be started.  A command-line client interface can be used to start/stop instances of the recon on each machine running the server.  This should allow us to run many instances of the recon in parallel on the new clon machines. 

I have tested the system locally on my laptop running 2-4 instances of the recon plus DQM, and I can confirm that events are being distributed in round-robin fashion between the different ET stations.  DQM plots are written incrementally every N events from each station and a simple server task combines them into a single ROOT output file.  I have not done this yet, but it should be straightforward to setup a JSROOT server in the counting house to monitor these combined plots in a browser.

Working test scripts for this framework can be found here:

https://github.com/JeremyMcCormick/hps-projects/tree/master/projects/online-recon-test

I know we are probably some time away from getting this into production in the counting house, but it would be good to start testing the system as soon as possible.  Likely some issues will crop up in the counting house computing environment.  We would need to setup the et2et component so that events are written to the secondary ET rings, for instance.

Who would like to take the lead in testing/running/managing this system in the counting house?

I am working remotely, and I believe this should be something that is administrated by someone who is local and working in Hall B.

Thanks!

--Jeremy

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