A specific editor has 200 K of program text, 15 K of initial stack, 50 K of initialized data, and 70 K of bootstrap code. If five editors are started simultaneously, how much physical memory is needed if shared text is used ?
875 K
With shared text, only one copy of the program text (the read-only code) is kept in memory and all running instances of the editor use it; every instance still needs its own stack, initialized data and bootstrap code.
Private part of one editor: \(15 + 50 + 70 = 135\) K.
Private parts of five editors: \(5 imes 135 = 675\) K.
Total physical memory: \(200 + 675 = 875\) K (without sharing it would be \(5 imes 335 = 1675\) K).
Hence, the answer is 875 K.
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