jyang1997/krr-stack-algorithm

Fast K-LRU Variable Object Size MRC Generation

KRR Stack Algorithm

This is a new probabilistic stack algorithm named KRR which can be used to accurately model random sampling based-LRU under arbitrary sampling size K (K-LRU).

The KRR model is first described in:

Efficient Modeling of Random Sampling-Based LRU(ICPP'21)

The directory src/basic_version contains the basic model described in ICPP'21 paper.

The (src/KRR_mult_ops.c, inc/KRR_mult_ops.h) is the extended version of the original KRR model:

• The new version support variable object size miss ratio curve generation while maintain same asymptotic complexity.
• The new version support multiple different software cache commands includes: GET, SET, UPDATE, DELETE. (In contrast, the old version follows the original stack(cache) access definition).

compile and run example

create variable object size aware KRR

make

create logic(uniform) object size KRR

make UNIFORM=yes

How to use KRR for mrc generation

{
  //k = k-lru's sampling size K
  //stack init
  KRR_Stack_t* stack = stackInit(k);


  while (workload_not_finished)
  {

      key = //key of current kv pair
      size = //size of current kv pair
      command = //"GET", "SET", "UPDATE", "DELETE" 
      stack_distance = KRR_access(stack, key, size, command);

      //record stack distance
  }

  stackFree(stack);

  //generate MRC using stack distance distribution
}

lib/src/spatial_sampling.c shows examples of how to feed spatially filtered traces to KRR model.