What is the function of 'lock' in rehash_kernel_for_fast_mode?

[9syj]

HierarchicalKV/include/merlin/core_kernels.cuh

Line 539 in 9c197a9

lock<Mutex, TILE_SIZE>(g, table->locks[bkt_idx]);

I am reading the code for the reserve interface.
Under what circumstances might multiple threads compete for the same bucket lock?
It seems that there is no such lock contention within the same kernel. So, could there be scenarios where multiple rehash_kernel_for_fast_mode kernels run in parallel?

I can't figure out how it works. Could someone help me?

[jiashuy]

Hi @9syj , thanks for you question. I checked that and think its not necessary. Multiple rehash scenario was hanlded by API lock. So the lock to the bucket can be delete in my opinion.

[9syj]

Get it. Thanks for your help. @jiashuy