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| technical:whitepaper:start [2021-02-12 16:01] – frey | technical:whitepaper:start [2022-06-17 12:25] (current) – [rJava: when compilers get too smart] frey |
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| {{ :technical:whitepaper:1344435822_27-edit_text.png?128|}}Some of the content in this area will be in PDF format and may need to be downloaded before being read. | {{ :technical:whitepaper:1344435822_27-edit_text.png?128|}}Some of the content in this area will be in PDF format and may need to be downloaded before being read. |
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| | ===== rJava: When Compilers Get Too Smart ===== |
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| | While installing all 16k (nearly 17k) CRAN packages on a recent R 4.1.3 build, many packages with a dependency on rJava would hang when being tested. [[technical:whitepaper:rJava-gcc-optimization|GDB debugging and analysis of both the C source and runtime assembly code]] revealed an interesting problem with GCC 11.2's compilation of the code. |
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| | ===== Open MPI, PSM2, and MPI_Comm_spawn() ===== |
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| | The MPI process-spawning API has not been frequently used on our clusters. A user reported an issue with the Rmpi library and example code that spawns R workers via MPI_Comm_spawn() on the Caviness cluster. The issue was debugged and addressed for all pertinent versions of Open MPI, and is [[technical:whitepaper:openmpi-psm2-spawn|summarized here]]. |
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| ===== Mellanox UCX and Open MPI on DARWIN ===== | ===== Mellanox UCX and Open MPI on DARWIN ===== |