IOGrind – the valgrind tool ...

• Records 'interesting' events:

• • ~all explicit I/O (a-la strace) in simplified form.
  • every 'first' page read
  • • allows simulation of mmap faulting
  • every first page-write
  • • allows real memory use estimation & potentially swap simulation
  • full stack frame information for every event
  • misc. other events:
  • • chdir, sbrk etc.

• Working set recording mode ...

• • Splits time into 'thunks'
  • • using a 0'th order I/O / time approximation
  • Tracks which pages are used across multiple thunks