ch4/xpmem: Support disabling mapped segment cache #7349
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We use this CVAR to control the initialization of XPMEM, so move it where it is most appropriate.
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Use initialized state when deciding whether to use XPMEM. Avoid overwriting the value MPIR_CVAR_CH4_XPMEM_ENABLE, which could be modified during runtime by MPI_T.
Make init and finalize symmetrical. Avoid calling GAVL utilities directly in finalize.
These functions are closely related. Combine them in a single file for ease of maintenance. Make segment register and free private static functions.
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Implement search and insert functions for mapped cache segments. These will be used by the handle mapping function, and will make for easier targets when adding the ability to disable the segment cache.
There may situations where disabling the mapped segment cache is desirable. Allow a way to control usage at runtime.
When the mapped segment cache is disabled, unmap segments once we are done copying from them. Since we need access to the actual attached address, we store it in the handle during mapping. To achieve this, we pass the handle to map/unmap by reference rather than value to allow modification of its contents.
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Pull Request Description
Cleanup and refactor portions of the XPMEM code to support disabling the mapped segment cache. The goal is to aid experimentation on systems with XPMEM to better understand the impact of the cache on application performance.
Author Checklist
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