Very slow data transfer even with multiple threads

Discuss new features and functions
Axel
Posts: 2
Joined: 11 Oct 2019

Post by Axel • 11 Oct 2019, 10:46

Hi,

I'm using the donation version and want to sync (mirror) data from an FTP to my local harddrive. Just copy the data with FileZilla I get about 100MB/s of data transfer. Using FreeFileSync with 10 threads I end up at about 100KB/s. I tried to mirror the data to an empty folder to have - more or less - the same condition like copying.

Are there any options to increase the speed?

Regards,
Axel

User avatar
Zenju
Site Admin
Posts: 5125
Joined: 9 Dec 2007

Post by Zenju • 11 Oct 2019, 11:02

Which FFS version are you using?

Axel
Posts: 2
Joined: 11 Oct 2019

Post by Axel • 11 Oct 2019, 11:16

10.16

User avatar
Zenju
Site Admin
Posts: 5125
Joined: 9 Dec 2007

Post by Zenju • 14 Oct 2019, 21:10

"Fail-safe file copy" increases the number of FTP accesses, something Filezilla probably doesn't do when copying files. Other than that, there shouldn't be a significant difference. If the difference is really that large, you might want to run Wireshark and have a look at what is happening at the network level. It's also possible that some external program (AV!) is messing with FreeFileSync.

xCSxXenon
Posts: 160
Joined: 11 Jun 2019

Post by xCSxXenon • 07 Nov 2019, 20:54

more threads does not mean faster. Sometimes a single thread is faster. Multi thread is ONLY better when the remote location limits the speed on a single connection.