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--- tech:unix:start [2015/03/28 14:35]
rk4n3
+++ tech:unix:start [2018/11/25 16:11] (current)
rk4n3
@@ Line 1: / Line 1: @@
-====== Technical UNIX Topics ======
+<typo fs:xx-large; fw:bold>UNIX Topics</typo>
-A {{:tech:unix:dot-kshrc-sample.txt|sample ''.kshrc'' file}}
+[[tech:unix:solaris:start|Solaris topics]]
+====== Troubleshooting Topics ======
+===== Troubleshooting SSH =====
+Start an SSH daemon in debug mode:<code>/usr/sbin/sshd -d -p 2222</code>
+Connect with client in verbose mode:<code>ssh -vv -p 2222 ServerIP</code>
+------
+====== AIX Topics ======
+==== AIX Kernel Lock Table - Front-Loading Overhead ====
+If fcntl is used to aquire locks on files without utilization of the range/region parameters, file locks are aquired without an offset, which has the side-effect of the lock entry being inserted at the beginning of the kernel's lock table.
+Interestingly, if an application relies on intensive utilization of such file locking, the overhead of unconditional traversal of the potentially over-sized set of lock entries crowded into the front of the lock table can be quite impactful.
+In one particular application, file locks acquired via fcntl was used for IPC-oriented synchronization in addition to actual concurrent file access, which introduced the overhead from kernel lock table front-loading to the application's multi-threaded processing concurrency - and the problem was also aggrevated by the addition IPC-oriented lock volume, as well.
+One mitigation technique would be to utilize the region/range parameters for fcntl, locking a region at an arbitrarily-high position, which has the side-effect of the lock entry being located away from the front of the lock table.
+------
+====== Sample config files ======
+==== .kshrc ====
+This sample ''.kshrc'' {{:tech:unix:dot-kshrc-sample.txt|file}} is typically paired with a ''.profile'' containing simply:<code sh>export ENV=${HOME}/.kshrc</code>
+==== .twmrc ====
+<code>
+# A .twmrc file personalized by rk4n3
+UsePPosition on
+RandomPlacement
+NoGrabServer
+OpaqueMove
+RestartPreviousState
+DecorateTransients
+#ClientBorderWidth
+#NoDefaults
+TitleFont			"-*-fixed-medium-r-*-*-12-*-*-*-*-*-*-*"
+ResizeFont			"-*-fixed-medium-r-*-*-12-*-*-*-*-*-*-*"
+MenuFont				"-*-fixed-medium-r-*-*-12-*-*-*-*-*-*-*"
+IconFont				"-*-fixed-medium-r-*-*-12-*-*-*-*-*-*-*"
+IconManagerFont		"-*-fixed-medium-r-*-*-12-*-*-*-*-*-*-*"
+Color {
+   DefaultBackground     "rgb:0/0/0"
+   DefaultForeground     "rgb:F/F/F"
+   BorderColor           "rgb:C/C/4"
+   TitleBackground       "rgb:3/3/3"
+   TitleForeground       "rgb:C/A/0"
+   MenuBackground        "rgb:2/2/2"
+   MenuForeground        "rgb:C/A/0"
+   MenuBorderColor       "rgb:F/F/0"
+   MenuTitleBackground   "rgb:4/4/4"
+   MenuTitleForeground   "rgb:F/F/0"
+   IconBackground        "rgb:4/4/4"
+   IconForeground        "rgb:C/A/0"
+   IconBorderColor       "rgb:4/4/4"
+   IconManagerBackground "rgb:4/4/4"
+   IconManagerForeground "rgb:C/C/4"
+}
+NoTitle { "stalonetray" }
+# Define some useful functions for motion-based actions.
+MoveDelta 3
+Function "move-or-lower" { f.move f.deltastop f.lower }
+Function "move-or-raise" { f.move f.deltastop f.raise }
+Function "move-or-iconify" { f.move f.deltastop f.iconify }
+# Set some useful bindings.  Sort of uwm-ish, sort of simple-button-ish
+#LeftTitleButton ":iconify" = f.iconify
+#RightTitleButton ":resize" = f.resize
+Button1 =   : root        : f.menu "MainMenu"
+Button1 = m : window|icon : f.function "move-or-lower"
+Button2 = m : window|icon : f.iconify
+Button3 = m : window|icon : f.function "move-or-raise"
+Button1 =   : title       : f.function "move-or-raise"
+Button2 =   : title       : f.raiselower
+Button3 =   : title       : f.menu "simplewinops"
+Button1 =   : icon        : f.function "move-or-iconify"
+Button2 =   : icon        : f.iconify
+Button1 =   : iconmgr     : f.iconify
+Button2 =   : iconmgr     : f.iconify
+#
+# And a menus with the usual things
+#
+menu "winops" {
+"Iconify"				f.iconify
+"Resize"					f.resize
+"Move"					f.move
+"Raise"					f.raise
+"Lower"					f.lower
+"-------------"		f.nop
+"Focus"					f.focus
+"Unfocus"				f.unfocus
+"Show Iconmgr"			f.showiconmgr
+"Hide Iconmgr"			f.hideiconmgr
+"-------------"		f.nop
+"Kill"					f.destroy
+"Delete"					f.delete
+"Lower"					f.lower
+}
+menu "simplewinops" {
+"Lower"					f.lower
+"Close"					f.delete
+"Kill"					f.destroy
+}
+menu "tools" {
+"Edit .twmrc"			f.exec "exec gvim ~/.twmrc &"
+"Restart TWM"			f.restart
+"-------------"		f.nop
+"Window..."				f.menu "winops"
+"============="		f.nop
+"Exit TWM"				f.quit
+}
+menu "MainMenu" {
+"rk4n3@darkstar"		f.title
+"Terminal"				f.exec "exec terminator &"
+"File Manager"			f.exec "exec xfe &"
+"-------------"		f.nop
+"Tools"					f.menu "tools"
+"Close window..."		f.delete
+"-------------"		f.nop
+"Geeqie"					f.exec "exec geeqie &"
+"Open Office"			f.exec "exec soffice &"
+"Firefox"				f.exec "firefox &"
+}
+</code>

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