Tier RAM budget by host size#752
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Use 25% of physical RAM on hosts with 16GB or less, 35% on 32GB or less, and 50% above. Expose cbm_mem_ram_fraction_for_total() for unit tests and call it from MCP/CLI startup instead of a fixed 50% fraction. Signed-off-by: Andy11-cpu <canada11@duck.com>
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Summary
cbm_mem_ram_fraction_for_total()with unit testsMotivation
Split from #625 — reduces default memory reservation on 16GB machines without changing indexing behavior.
Test plan
mem_ram_fraction_*tier tests intest_mem.cmake -f Makefile.cbm test(CI)Signed-off-by: Andy11-cpu canada11@duck.com