On Mon, Jan 31, 2022 at 10:17:59AM -0500, cyg...@kosowsky.org wrote: > Eliot Moss wrote at about 09:59:17 -0500 on Monday, January 31, 2022: > > On 1/31/2022 9:52 AM, cyg...@kosowsky.org wrote: > > > I tried renaming some very large files (20-40 GB) using: > > > mv <oldname> <newname> > > > without changing the directory of course. > > > > > > The process took about 10-20 minutes with Task Manager showing disk > > > activity of 100+ MB/s. > > > > > > Is there something about such large 'renaming' that actually results > > > in the file being really moved (aka copied) rather than just renamed? > > > > The two places are probably on different volumes (loosely, different > disks). > > That requires a physical move, even under Linux. > > No my point is I am just *renaming*, not physically moving the file!! > i.e., I am not changing the directory location of the file, let alone > the volume/disk location. > (I am well aware that 'mv' does a copy when changing volumes/disks). > > I literally am typing something like: > mv foo bar > > In Linux, that just edits the file system table & inode... > > UPDATE... > I just tried a second 'mv' and it was near instantaneous. > (and similarly with subsequent renaming of the same file) > So perhaps not a 'Cygwin' thing but something going on within Windows. > > Could it be that the first 'mv' triggered an anti-virus read of the file since > perhaps it detects it as a new/changed file? > > But if so, would 'mv' (under Task Manager) be showing the 100+ MB/s disk > activity?
That definitely seems plausible; there's a reason a significant number of the applications that are known to interfere with Cygwin operation (see [0]) are antivirus applications. But what would trigger your antivirus to want to scan a file, and how much work is required to do that, is something you'll need to take up with your antivirus vendor, I'm afraid. [0]: https://cygwin.com/faq/faq.html#faq.using.bloda -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
