Mobile and Desktop Memory Management

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Presentation transcript:

Mobile and Desktop Memory Management What did you see? Mobile and Desktop Memory Management

Virtual Memory When the programs do not all fit in RAM, pages of the program not currently being used are stored on disk If the system needs memory for an active program, it may page out parts of other programs

Page Faults When a program attempts to use a page that is not in RAM, a page fault interrupt occurs The operating system will suspend the program while it copies the needed page into RAM If there are lots of page faults, the program has little time to run and CPU utilization with drop

Execution Time vs. Program Size

Chart Explanation The following chart shows the execution time for programs of different size Multiple copies of the program were run at different sizes All programs, regardless of size, executed exactly same number of instructions, the same CPU processing Differences in time are caused by OS overhead managing the memory

Windows Memory Stress

Android Test Running the experiment on Android phones produces varying results on different phones Running the experiment on the Android emulator may take a very long time

Android Performance

Android Performance