I am trying to figure if there is any justification for the continued mention of segmented addressing in the standard. Also, it is not clear to me that we have ever had any implementation experience that gives us the expertise to standardize features for it.
x86 real mode support was dropped in Windows 3.1. Linux never supported it because it was created for 386. I cannot find any evidence that anyone has ever supported MPI on a 286, or any operating system that supported 16-bit real mode. https://en.wikipedia.org/wiki/Coherent_(operating_system) ran on 286 but didn't support TCP/IP so it's not clear how MPI would have achieved parallelism. https://en.wikipedia.org/wiki/Xenix was discontinued in 1987. What operating system are we using as the reference for reasoning about how MPI works on such systems? https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=06e491ccb3ce9747ae4754b8bdd8c249c3276733 has some relevant history. Jeff -- Jeff Hammond jeff.scie...@gmail.com http://jeffhammond.github.io/
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