Modeling multiprogramming tting Systems c Suppose a computer has 32MB of memory, with the os taking up 16MB and each user program taking up 4MB H These sizes allow 4 programs to be in memory at once. With an 80% average lO wait. we have a cPu utilization of 1-0.8460% H Adding another 1 6MB of memory allow 8 programs, thus raising the CPU utilization to 83% w Adding yet another 1 6MB of memory allow 12 programs, only increase CPU utilization to 93% ..97 Gao Haichang, Software School, Xidian UniversityOperating Systems Gao Haichang , Software School, Xidian University 9 Modeling Multiprogramming  Suppose a computer has 32MB of memory, with the OS taking up 16MB and each user program taking up 4MB.  These sizes allow 4 programs to be in memory at once. With an 80% average I/O wait, we have a CPU utilization of 1-0.8^4≈60%.  Adding another 16MB of memory allow 8 programs, thus raising the CPU utilization to 83%.  Adding yet another 16MB of memory allow 12 programs, only increase CPU utilization to 93%.  …97%  …