# \#multiprocessing

**URL:** https://discourse.julialang.org/tag/multiprocessing/1702.md

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## [Parallel feeding of a dataframe](https://discourse.julialang.org/t/parallel-feeding-of-a-dataframe/127061)

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**Author:** [@Ju\_ska](https://discourse.julialang.org/u/Ju_ska)\
**Replies:** 17\
**Last updated:** [March 26, 2025, 12:39am UTC](https://discourse.julialang.org/t/parallel-feeding-of-a-dataframe/127061 "2025-03-26T00:39:12Z")

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Hi, this is my problem: I have files of the same type in year folders, e.g.: ./2024/file1.csv ./2024/file2.csv ./2023/file1.csv ./2023/file2.csv etc. I want to fill a dataframe with all this data. I already use read…

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## [Nested parallelization in MPI with small outer loop and large inner loop](https://discourse.julialang.org/t/nested-parallelization-in-mpi-with-small-outer-loop-and-large-inner-loop/123610)

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**Author:** [@pat-alt](https://discourse.julialang.org/u/pat-alt)\
**Replies:** 2\
**Last updated:** [December 17, 2024, 3:25pm UTC](https://discourse.julialang.org/t/nested-parallelization-in-mpi-with-small-outer-loop-and-large-inner-loop/123610 "2024-12-17T15:25:59Z")

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I’m trying to run a slurm job using MPI, that involves a nested loop, where the outer loop is over a smaller list of size m than the inner loop (size n). For the inner loop, I want to use as many processes as possible np…

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## [Why can Julia spawn new processes but not new threads?](https://discourse.julialang.org/t/why-can-julia-spawn-new-processes-but-not-new-threads/123267)

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**Author:** [@NonDairyNeutrino](https://discourse.julialang.org/u/NonDairyNeutrino)\
**Replies:** 1\
**Last updated:** [November 30, 2024, 5:10am UTC](https://discourse.julialang.org/t/why-can-julia-spawn-new-processes-but-not-new-threads/123267 "2024-11-30T05:10:57Z")

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With Distributed.jl, you can create new worker processes easily with addprocs (each of which can have multiple threads), but once a Julia process starts you can’t add more threads to that process; why?