How to make fastmap support more cpu cores than 32 or 80

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
c
Domain
operating-systems

Research direction

Start by reading the freelist and alloc_page_lock logic at the referenced locations in driver/mmap_buffer_hash_table.c, then inspect the related constants in shared_defines.h. Determine what changes are needed for a 256-core configuration and verify that FastMap no longer crashes with that configuration.

Written by the indexing model from the issue text.

Description

I tried to run FastMap on a server with 256 cores, and FastMap crashed at alloc_page_lock. I read the code and found that FastMap only supports 32 and 80 freelists (or cores) according to mmap_buffer_hash_table.c shown below. How to make it variable? I am also confused about setting constants in shared_defines.h? Could you show a correct setting with 256 cores? Thank you.

https://github.com/CARV-ICS-FORTH/FastMap/blob/06a2c9387ce6e8c280d7d01fee02b286e6954ef7/driver/mmap_buffer_hash_table.c#L135

https://github.com/CARV-ICS-FORTH/FastMap/blob/06a2c9387ce6e8c280d7d01fee02b286e6954ef7/driver/mmap_buffer_hash_table.c#L280

Dominant language
C
Stars
37
Forks
6
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