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crazy number of allocations on file read #273

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tiemvanderdeure opened this issue Jan 8, 2025 · 0 comments
Open

crazy number of allocations on file read #273

tiemvanderdeure opened this issue Jan 8, 2025 · 0 comments

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@tiemvanderdeure
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I'm trying to read the E-OBS weather dataset and reading in the data is extremely slow and generates millions of allocations.

For this file I am getting:

ds = NCDataset(path)
@time ds["hu"][:,:,1:20];

0.800117 seconds (8.29 M allocations: 182.748 MiB, 26.05% gc time)

There seems to be some type instability in CFtransformdata! in CommonDataModel, but just nc_get_vars! also takes half the time.

This is on NCDatasets 0.14.6 and CommonDataModel 0.3.7

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@tiemvanderdeure