LogP machine

The LogP machine is a model for parallel computation.^[1] It aims at being more practical than the PRAM model while still allowing for easy analysis of computation. The name is not related to the mathematical logarithmic function: Instead, the machine is described by the four parameters $L$ , $o$ , $g$ and $P$ .

The LogP machine consists of arbitrarily many processing units with distributed memory. The processing units are connected through an abstract communication medium which allows point-to-point communication.

The machine is described by the four parameters:

$L$ , the latency of the communication medium.
$o$ , the overhead of sending and receiving a message.
$g$ , the gap required between two send/receive operations.
$P$ , the number of processing units. Each local operation on each machine takes the same time (``unit time). This time is called a processor cycle.

The units of the parameters $L$ , $o$ and $g$ are measured in multiples of processor cycles.

Notes

^ Culler et al. 1993

References

Culler, David; Karp, Richard; Patterson, David; Sahay, Abhijit; Schauser, Klaus Erik; Santos, Eunice; Subramonian, Ramesh; Von Eicken, Thorsten (July), "LogP: Towards a realistic model of parallel computation", ACM SIGPLAN Notices 28 (7): 1–12, doi:10.1145/173284.155333, http://www-static.cc.gatech.edu/~bader/COURSES/UNM/ece638-Fall2004/papers/CKP93.pdf

LogP machine

See also

Notes

References