Johannes Schlüter 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/