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EDA software and libraries, license service, job scheduler and simulation farm. Chip designers submit simulation jobs to job scheduler. Job schedulers monitor each server’s resources in the simulation farm and allocate required resource to run simulation jobs.
Depending on the type of simulation and EDA software, digital simulation tends to favor server with high clock speed, large L3 cache and high memory for single-threaded performance to minimize license checkout time, analog simulation tends to favor server with high core counts for multi-core performance to minimize job run time. Some physical design software requires very high memory such as place and route. Physical design verification job tends to run very longer time.
So, simulation farm has different servers dedicated to specific software and job type. EDA engineering IT team need schedule each workload carefully to maximize simulation farm resources and minimize license checkout time.