microsoft / microsoft/mimalloc
Can MIMALLOC_RESERVE_HUGE_OS_PAGES reduce memory?
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Description
Hi, here is my observation from Task Manager on Windows:
when `MIMALLOC_RESERVE_HUGE_OS_PAGES==0`, my program occupies 1200MB memory;
when `MIMALLOC_RESERVE_HUGE_OS_PAGES==2`, my program occupies 800MB memory;
2 questions here:
1. For `MIMALLOC_RESERVE_HUGE_OS_PAGES==2`, I think os need to reserve 2GB memory for my program, why only 800MB here?
2. Why `MIMALLOC_RESERVE_HUGE_OS_PAGES==2` need less memory than `MIMALLOC_RESERVE_HUGE_OS_PAGES==0`?
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Research direction
Start with the MIMALLOC_RESERVE_HUGE_OS_PAGES setting and the reported Windows Task Manager measurements. Determine why reserving two huge pages reports about 800 MB rather than 2 GB and why that setting changes the observed memory usage; done means answering both questions with evidence from the allocator’s documented behavior or implementation.
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Assessment
- Tech stack
- c
- Domain
- operating-systems, performance
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100