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--- glossary [2020/12/20 14:49] – senioradmin
+++ glossary [2021/01/16 22:24] (current) – senioradmin
@@ Line 1: / Line 1: @@
+===== PSS =====
+The “proportional set size” (PSS) the tool smem reports is the memory the program plus the "fair share" of each shared area to give a realistic measure. At simpletools.info the PSS is the crucial criterion to determine the memory footprint of a program. The unit is **kilobyte (kB)**.
+===== RSS =====
+Most standard Unix memory tools are reporting the “resident set size” (RSS) - which roughly is the memory usage of a program plus the shared libraries it needs. Because it includes the whole shared memory it shares with other programs this isn't a fair representation of memory a program really needs.
+===== USS =====
+The "unique set size" (USS) reports the memory needed by the program binary only, without any shared library it might need. This underestimates the programs memory footprint,unless it is a static linked binary.
 ===== dynamic window manager =====
 Dynamic window managers can dynamically switch between tiling or floating window layout. It means you can change the arrangement of windows at any time.