[Halld-offline] Software Meeting Minutes, July 6, 2021

[Mark Ito]

To Whom It May Concern,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Software_Meeting,_July_6,_2021#Minutes> 
and below.

   -- Mark

      _________________________________


    GlueX Software Meeting, July 6, 2021, Minutes

Present: Thomas Britton, Sean Dobbs, Mark Ito (chair), Igal Jaegle, 
Naomi Jarvis, Simon Taylor, Beni Zihlmann

There is a recording of this meeting 
<https://bluejeans.com/s/Jy05QsGESGb/>. Log into the BlueJeans site 
<https://jlab.bluejeans.com> first to gain access (use your JLab 
credentials).


      Announcements

 1. Small Cache File Report
    <https://mailman.jlab.org/pipermail/halld-offline/2021-July/008575.html>
    We went over the web page that Mark sent around last week. Thomas
    has started moving small files generated by MCwrapper off the cache
    disk. Sean requested finer-grained information on the location of
    the problematic files.
 2. new hdgeant4 ability to generate mu+mu- pairs in GlueX target
    <https://mailman.jlab.org/pipermail/halld-offline/2021-July/008574.html>
    Richard added this new feature to help with CPP simulations.
      * New version of hdgeant4: 2.25.0, new version set: 4.42.0
        <https://mailman.jlab.org/pipermail/halld-offline/2021-July/008576.html>
        This new version set contains a new tag of HDGeant4 with this
        feature.


      Review of Minutes from the Last Software Meeting

We went over the minutes from the meeting on June 22nd 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Software_Meeting,_June_22,_2021#Minutes>. 
There was some significant discussion on action items. Some were 
dropped. See the list list below for the survivors.


      Minutes from the Last HDGeant4 Meeting

We went over the minutes from the meeting on June 29th 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_June_29,_2021#Minutes>. 
On the version upgrade front, Mark has succeeded in building the 
following combination:

  * CentOS 7
  * Developer Toolset 8 (gives GCC 8.3.1)
  * ROOT 6.24.00
  * Geant4 10.06.p01

He is in the process of packaging the build and use instructions.


      Report from the July 1st SciComp Meeting

Mark went through the agenda of the meeting 
<https://halldweb.jlab.org/talks/2021/scicomp_agenda_2021-07-01.pdf>. 
Present at the meeting were Brad Sawatzky, Bryan Hess, Graham Heyes, 
Markus Diefenthaler, Mark Ito, David Lawrence, Amitoj Singh, Ole Hansen, 
Nathan Baltzell, and Chris Larrieu. Mark made some remarks about the 
discussion at the meeting:

  * Mark's clean up efforts on /work/halld have stopped with the hope
    that we have enough margin to make it to release of space on the new
    work file server. We are at 94% full right now.
  * For the last batch of tapes sent to IBM for recovery, uncorrupted
    files were re-written to tape before the damaged tape was shipped,
    vastly reducing the number of unavailable files.
  * The list of high-priority files missing from the tape library, given
    to SciComp, is moot at this late stage of recovery. We wait for the
    normal process to complete.
  * There was discussion of Rucio <https://rucio.cern.ch/> as a possible
    solution to tracking files generated by data taking and launches. A
    database of such files could help in deciding if a production effort
    is done by making it possible inventory the output files produced
    and determine if any files are missing.


      Work Disk Performance

Beni recalled that, some years ago, Alex Austregesilo had trouble 
merging files using the work disk. The method used at the time generated 
so much activity that the disk was rendered unusable for all. He 
wondered if this was a problem that is still with us.

Mark remarked that he is thinking about future guidance on what disk 
should be used for which purpose. Volatile: staging of large output 
files; cache: files to be written to tape; work: personal builds and 
tests. Beni commented that we stopped worrying about work disk space 
during 2020 because there was plenty of space available.


      Action Item Review

 1. Decide on needed tape volume sets. (Sean, Mark I.)
 2. Review disk usage when re-repatriating recon launch data. (Alex, Mark)
 3. Automatically make CCDB entries for selected RCDB items. (Mark I.)
 4. Modify the documentation on how to copy files from JLab. (Mark I.)
 5. Generate finer-grained info on small cache files. (Mark I.)

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  * This page was last modified on 8 July 2021, at 11:11.

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