Data flow                         <ul><li>Application to library buffer </li><ul><li>fwrite(), fprintf() and ...
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    1. 1. Data flow <ul><li>Application to library buffer </li><ul><li>fwrite(), fprintf() and friends </li></ul><li>Library to OS buffer </li><ul><li>write(2) </li></ul><li>OS buffer to disk </li><ul><li>paged out, periodic flushing (5 or 30secs usually) </li><ul>– <li>Can be very delayed with laptop mode </li></ul><li>fsync(2), fdatasync(2), sync(2) </li><ul>– <li>with caveats! </li></ul></ul></ul>
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