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Attendees: Philippe, Jakob, Axel, Guilherme, Oksana.
Jakob: Spend time in Mainz. Talked about PhD student dram disk. Agreed in principle, need to write 2 pages project description. He has 2 candidates in mind. Dateline for submission is in October. Nice chat with Stefan, RooFit may be a customer for RTuple since it has a concept of interchangeable backend and also has some vector operations.
Jakob: Plan for summer: improvements for RTuple, focused on the storage side, memory management, storage access routines/interface. (one goal is to have asynchronous interface) … and benchmarks.
Chep2019: Jakob’s talk is accepted as oral. Oksana’s talk as poster.
Oksana: Introducing Alfonso the GSOC student working on compression.
Alfonso: Working on incorporating Zstd, cleaning up the existing PR. To take advantage of Zstd, we will need to update TBasket and the like.
Oksana: lz4 can use compression dictionary but it can not generate them … we need Zstd for that.
Axel: humm but lz4 in normal operation is creating a compression dictionary. Could we update the code so that we can capture it?
Axel: One thing we could do is to ‘capture’ the compression dictionary after the first basket and re-use for the the other basket. This might be a generic solution without needing Zstd.
Alfonso: We also need to understand the cases where the compression is not very successfull.
Oksana: In Kiev dealing with PhD bureaucracy.
Guilherme: RAS.
Philippe: TClonesArray streaming: add support for v5 TF1 and TFormula. Add support for changing the data type (user driven.
Axel: Trying to get the release done …. (And talked to Jakob about the RTuple code) … Will be working on asynchronous part of RTuple (still using TFile for now).
Meetings: Oksana will chair the I/O meeting for the next 6 weeks.