Reading time from multiple forcing netCDF files (> 2Gb) very slow

[verseve]

Reading the time variable from multiple forcing netCDF files (e.g.: "inmaps-er_*.nc">2 Gb) is very slow. During model initialization it hangs here:

Wflow.jl/src/Wflow.jl

Line 47 in d1dcbfe

nctimes = reader.dataset["time"][:]

A possible solution is to read the time variable in a for loop once, and to store nctimes (as part of NCReader). I did a small test (for loop) and this gives a significant speedup. @ahweerts did report the issue. Bit strange that until now no one else ran into this issue (Wflow runs have been made at the global scale, including multiple forcing files). @visr : perhaps you have some additional info/insights on this?

[verseve]

Not able to reproduce this issue with NCDatasets v0.12.3, with v0.12.4 Wflow initialization hangs, need to check differences between these two versions...

Reported the following issue: Alexander-Barth/NCDatasets.jl#194