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+====== htop ======
+  * [[Linux Memory and Processes]]
+htop is an alternative display for top, showing system processes.
+By default, htop will order the processes by PID.
+=== FreeBSD ===
+<code>
+echo linproc /compat/linux/proc linprocfs rw 0 0 >> /etc/fstab
+mkdir -p /usr/compat/linux/proc
+ln -s /usr/compat /compat
+mount linproc
+</code>
+=== Examples ===
+Show processes being run by user mysql:
+<code>
+htop -u mysql
+</code>
+Display threads for user apache, sorted by how long they have been running:
+<code>
+htop -u apache --sort-key TIME
+</code>
+See how much memory apache threads are really using, highest values first:
+<code>
+htop -u apache --sort-key M_RESIDENT
+</code>
+Watching the system to see what programs are using the most memory, the highest percentage of CPU, the highest percentage of memory, and then running the longest time:
+<code>
+htop -u apache --sort-key M_RESIDENT
+htop -u apache --sort-key PERCENT_CPU
+htop -u apache --sort-key PERCENT_MEM
+htop -u apache --sort-key TIME
+</code>
+=== Display Values ===
+The default values displayed are:
+  * PID
+  * USER
+  * PRIORITY
+  * NICE
+  * M_SIZE
+  * M_RESIDENT
+  * M_SHARE
+  * STATE
+  * PERCENT_CPU
+  * PERCENT_MEM
+  * TIME
+  * Command
+=== Gotchas ===
+htop's argument for sorting by keys is not consistent across versions, despite what the --help output may say.  To sort by a key, use ''--sort-key <value>'', which will work everywhere.