[Interest] QFile copy and sync/fsync

[Thiago Macieira]

On quinta-feira, 3 de janeiro de 2013 23.25.54, Nikos Chantziaras wrote:
> > That has nothing to do with it. Unbuffered mode means that QFile will not
> > buffer (and will not use buffered stdio either). Instead, it will use
> > directly the low-level POSIX API like open(2) and write(2).
> > 
> > The OS may still buffer.
> 
> In synchronous mode?  I assume that the usual "cp -a this /mnt/there" is 
> a good test for this.  In synchronous mode, the files are written out 
> immediately.

Synchronous mode is what makes the OS write immediately to disk after 
write(2).

As I said, that's got nothing to do with Unbuffered mode. Since the buffer is 
just 16 kB, it will not make things faster or slower in a file copy.
-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
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