osx - NSLog for debug only ? or to capture logs anyway? -

i new cocoa development. question if want keep application log file, when in production. use nslog or have create own file , write logs in ?

the purpose able identify problems when in production log file. nslog seem put log in console screen when debugging, happens nslog when released ? can nslog entries retrieved ?

nslog entries end in system log files. can view these in console.app in /applications/utilities.

nslog slow down app use when needed.