====== Johannes Schlüter DTrace ======

[[http://en.wikipedia.org/wiki/DTrace|DTrace at Wikipedia]]

  * Debugger?
    * gdb
    * dbx
    * xdebug
    * ZendDebugger

    * not really suitable on live systems
    * who's to blame? php, mysql, server?
  
  * dtrace is a module to have a live peak what's happening on your system
  * developed by sun
  * no effect when deactivated
  * it has full data integrity
  * scalable 
  * script language to control dtrace
     * user defined Variables
 
  * 100% opensource cddl
     * Solaris 10
     * OpenSolaris
     * Freebsd
     * macos x
     * linux?
 
  * On Solaris you can use DTrace without Root Privileges

  * Probes
     * Provider (hook up to certain calls)
       * syscall (every system call)
       * function boundary tracing  
  
  * DTrace rewrites Programms at runtime in Memory, jumps to DTrace then back to ProgrammLogic
  * will come to PHP soon  
  * Gui? Chime [[http://opensolaris.org/os/project/dtrace-chime/]]