[Halld-offline] Offline Software Meeting Minutes, March 30, 2016
marki at jlab.org
Wed Apr 6 21:32:38 EDT 2016
Please find the minutes below and at http://tinyurl.com/hjvnnko ,
GlueX Offline Meeting, March 30, 2016, Minutes
There is arecording of this meeting <https://bluejeans.com/s/9n7o/>on
the BlueJeans site.
* *CMU*: Mike Staib
* *FIU*: Mahmoud Kamel
* *FSU*: Brad Cannon
* *JLab*: Alex Barnes, Mark Ito (chair), David Lawrence, Paul
Mattione, Sandy Philpott, Dmitry Romanov, Nathan Sparks, Justin
Stevens, Simon Taylor
* *NU*: Sean Dobbs
1. sim-recon version 1.10.0 was released
2. Change to Farm Priority Scheme
The "exclusive" queue is now a thing of the past. Exclusive use of a
node is still available by requesting the requisite number of cores
in the Auger request. The change was made on March 10.
Review ofminutes from March 2
TheRCDB source code repository <https://github.com/JeffersonLab/rcdb>has
migrated to GitHub. The Subversion repository is no longer the
authoritative source of the code. Previously, only the wiki for the
GitHub repository was being used.
Paul presented slides on his study of the multi-thread scaling behavior
of the offline jobs. He looked at two cases: the loaded-with-32-plugin
offline monitoring jobs and a 2-plugin-rest-producing jobs. Each case
was tried with a range of threads. Clear memory saving is seen with
multiple threads. Scaling is generally good, but the curves turn over
when then number of threads gets comparable to the number of cores,
especially with the histogram-heavy offline monitoring jobs.
Please seehis slides
details and plots.
Sean described his experience with the March 18 Calibration Train
Journey. For the final pass, he is creating raw data skims for
calibration purposes. For this pass he sees a sweet spot at eight
threads. For details, please seehis slides
NSB not quite zero
Mike described the "feature" of the F250 firmware whereby a requested
value of the number of samples before the pulse (NSB) of zero was not
accepted. Instead a value of one is used. This was causing an error in
the pedestal subtraction; the number of samples was always one more than
expected. The change is explained inhis recent email
the Calibration Group.
A pull request will be submitted soon.
The configuration files have been changed to request NSB = 1, a request
that the firmware will honor.
Dmitry previewed changes coming with version 1.07 of the CCDB. Seehis
all of the details.
There was some discussion of a new scheme that allows a one-to-many
relation between calibration constants (the one) to run number
assignments (the many). In other words, one set of calibration constants
can be applied to different run ranges; the constants themselves need
not be duplicated in the database. The advantage of this feature is that
the equivalence of constants for one run range with those of another can
be tested by comparing the constant set references without h having to
compare the constants themselves. This feature also simplifies copying
constants from one range to another; one simply copies the reference.
This idea was described in the original design document of the CCDB.
Future Trends in Nuclear Physics Computing Workshop
We reviewed theagenda
workshop held two weeks ago. David gave a talk; Mark appeared on a panel.
There was a discussion with Amber and Frank Wuerthwein of the OSG on
exploring JLab enhancing our facility with the use of OSG resources.
This will be pursued initially through the GlueX VO with Richard, our
Access to Fairshare Information from JLab Farm
We agreed to ask SciComp for access to the priority information that
heretofore has only been available from occasional emails.
Nathan described the latest. Seehis slides
<https://halldweb.jlab.org/talks/2016/hdpm_03-30-16.pdf>for the details.
His second slide on recent changes:
1. Setup file can be sourced from any directory
2. Use hdpm commands from any directory
3. Option added for passing subdirectory of sim-recon to "build" command
4. Added "hdpm run" command
The last item allows users to run an arbitrary command in a target
environment set-up by HDPM.
* This page was last modified on 6 April 2016, at 21:28.
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