Call the Doctor - Weekly HDF Clinic


Hi all, just a reminder Call the Doctor is starting shortly, on the hour. (1pm central)

We hope to see you in the session!


We had another sub for Call the Doctor this past Tuesday. Scot Breitenfeld stepped in with a presentation on a really key foundational topic, the HDF5 data model and how to structure your data to achieve your goals. Highly recommend for anyone getting started in HDF5 or struggling with some performance concerns.

Call the Doctor is every Tuesday at 1pm central, although it will be held next week (10/12) in conjunction with the HDF5 Users Group (register here) then after that back to it’s own zoom meeting (register here).


Don’t forget, Call the Doctor is happening tomorrow, Tuesday, at 1:00 p.m. central with Gerd Heber @gheber) as our regular host.


Greetings everyone,

Just a quick announcement, there will be no Call the Doctor HDF5 help session held tomorrow, Tuesday, December 28. We will resume sessions in 2022, starting on Tuesday, January 4.

You can catch up on past sessions with this youtube playlist:

If you’d like to make learning more about HDF5 your New Year’s Resolution, or maybe just attend every once in awhile, please register. You only need to register once and you can jump in on any future session.


Don’t forget to join us for Call the Doctor, the free HDF5 help session tomorrow, Tuesday, February 1 at 1:00 p.m. central time. Just register to join us.

@gheber frequently addresses recent forum posts to provide a little more insight. Bring your question to the session, or put it in this google doc to be addressed. You can also catch up on past sessions with this youtube playlist.


Call the Doctor will be tomorrow (Tuesday 3/15) at 1:00 p.m. central with Gerd Heber (@gheber). We welcome any new questions you may have. Tomorrow’s planned content is to continue discussing HDF5 applications and clients in Cloud-based environments.

Register to join us or check out the last session on youtube.


The Call the Doctor session scheduled for Tuesday, May 3 has been cancelled as many staff members and associates of The HDF Group are busy with the Exascale Computing Project (ECP) annual meeting taking place this week.

Feel like you’re missing out on content? Check out the HDF5 VOL Status Report, or the slide deck prepared for the Parallel I/O with HDF5 and Performance Tuning Techniques presentation. And of course, don’t forget to register for the European HDF5 Users Group meeting, taking place in-person at ITER in France and remotely on Zoom.


When is the next Call the Doctor session scheduled to take place?.


Tomorrow, May 24 at 1:00 PM (CDT). Feel free to leave a question. G.


When is the next Call the Doctor session scheduled to take place.



Our next Call the Doctor session will be Tuesday, 9/6 at 1:00 pm. Central time (US/Canada). Over the next few weeks several different HDF Group employees will be taking over the hosting gig and presenting content and answering questions in their areas of expertise:

  • Sept 6, 1:00 p.m. central - Scot Breitenfeld (@brtnfld) - HPC, Fortran
  • Sept 13, 1:00 p.m. central - John Readey (@jreadey) - Cloud services, HSDS Principal Architect
  • Sept 20, 1:00 p.m. central - Aleksandar Jelenak (@ajelenak) - Python, h5py contributor

As always, feel free to bring any HDF-related question (put it in the google doc ahead of time if you can), but this is a great chance to get in front of an engineer who may have the expertise you need for your project, for free.

Register to join us:

Upload 55 Gb hdf5 file to Kita Lab server
Fastest way to read arbitrary rows from big h5 file

2 posts were split to a new topic: HDF5 for scientists: h5py, HDF5/JSON, and storing linked data in HDF5 files - Call the Doctor September 20, 2023