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+---
+tags:
+  - linux
+  - ostep
+---
+Process: running program.
+Program: lifeless, set of bytes stored on disk -> OS brings it into action -> it becomes a process.
+
+Basic technique: **time sharing**. Cost: **performance**. Processes are juggled running one at a time for a short duration.
+**Space sharing** divides space rather than time. E.g a disk is space shared.
+
+**Mechanisms** are low-level methods or protocols.
+A **contxt-switch**
+\ No newline at end of file