What is PIM? 

General-purpose Machine 
PIM is an MIMD machine which can efficiently execute the KL1 general-
purpose high-level language. 

Parallel Machine with about 1000 Processors 
Scalable architecture consisting of high-performance processors 
Adequate speedup is obtained with about 1000 processors. 

Inference Machine 
Dedicated instructions and hardware for efficient implementation of the con-
current logic language KL1 (e.g., dereference instruction and tag architecture) 

Performance 
A processing element of PIM/p and PIM/m yields 300 - 600 KRPS (append). 
Thus, a full size system of PIM/p (512 PEs) achieves 250 MRPS (append) 
approximately. 
250 MRPS corresponds to about 3.6 GIPS. 

Five Modules 
In order to examine various PIM architectures, Five modules are being devel-
oped: PIM/p, PIM/m, PIM/c, PIM/i and PIM/k. 





PIM Architecture 


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