In computing, $$ is a technique employed to achieve parallelism. $q,$ The processors are all connected to a "globally available" memory, via either software or hardware means. Even distributed MIMD machines require synchronization to operate together on single programs.

$$ SIMD $($Single instruction, multiple data$)$

MIMD $($multiple instruction, multiple data$)$

NIMD $($null instruction, multiple data$)$

$$ XIMD $($mixed instruction, multiple data$)$