Pausing a sync appears to not stop I/O ?

[therube]

Pausing a sync appears to not stop I/O ?

13.0, Win7

File Content compare
Two Way sync
VerifyCopiedFiles enabled

1. Paused
2. Well after I Pause, but still I/O going on
3. After 'Stop', I/O went to nil
.

FreeFileSync13 Pause, but still going & going.png (58.99 KiB) Viewed 2298 times

[therube]

1. here I paused it (almost immediately).
2a. the 1st set of I/O (yellow & purple) shows that the actual I/O continued, & the sync actually finished (even though it was "Paused")
2b. as the sync finished, I/O dropped to 0
(we're still paused during this time)
Then I "un-paused" it.
2c. with that I/O again started (all yellow), & this is the VerifyCopiedFiles kicking in
3. sync had already finished (during the "Pause"), & then, once un-paused, VerifyCopiedFiles also finished.
(& all was done :-))
.

FreeFileSync13 Pause, but still going & going 2.png (22.49 KiB) Viewed 2287 times

[xCSxXenon]

Yeah, I think clicking pause will still finish the current file before actually stopping. It feels more like a 'pause request' and should maybe say "pausing" first

[Plerry]

Fully in line with zCSxXenon's reply:
if you pause an ongoing FFS sync, FFS will finish the sync of the file it was busy syncing before actually pausing. So, if FFS just started to sync a large file, it may take a while before FFS actually pauses.

[therube]

I hear what you're saying... but let me think about that for a bit... ?

So you're saying, once you've dropped the letter into the postbox, it is "sent" - unless you go dumpster (postbox) diving (hitting Stop).

So you can't actually "Pause" (let's call it a large file). So you can't say, "oh, I've transferred 1001 bytes of this four million byte file" - Pause - & with that I/O also [actually] pauses, & when you say, Resume, it says, "ah, I now start at byte 1002"?

Well, you (other software) certainly can "Pause" *and* have I/O - paused, & resume (at byte 1002) & complete successfully (all that had had been Paused).

So... why does FFS not do that?
Because... ? ... potentially if you're uploading to the "cloud", particular protocols... ?
.
pause, resume, pause, resume, pause, resume ... & during Pause, no I/O.

Salamander pause RESUME pause RESUME pause RESUME - no IO during pause.png (7.23 KiB) Viewed 2260 times

[Plerry]

> So... why does FFS not do that?

I am just describing my own experience.
I can't tell you why; you would need to ask Zenju.

[Zenju]

viewtopic.php?t=6562#p21664

[therube]

no way to use the VPN temporarily for other tasks as the link is fully saturated

Same sort of condition that brought it to light, for me.