Topic "Multiple connections to server in single WinSCP session....."

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jefe
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Joined: 2009-07-19
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Location: Northport, Long Island, NY
In uploading to my server on the west coast of the U.S. I typically see upstream speeds of 330 kB/s. My ISP provides me with an upstream bandwidth of 20+ mb/s. I like to be able to use more of the upstream pipe I have available to shorten file transfers.

If I have multiple files to transfer I can do so by opening multiple sessions of WinSCP and starting one (or several) transfers in each session. By doing that I see ~330 kB/s in each of the sessions, until I saturate my upstream pipe.

It would be great if WinSCP offered the option to connect X times to a server, thus allowing multiple files to transfer simultaneously.
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martin
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jefe wrote:
It would be great if WinSCP offered the option to connect X times to a server, thus allowing multiple files to transfer simultaneously.

Well, it does. You can use up to nine background transfers.
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Martin Prikryl
jefe
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Location: Northport, Long Island, NY
Wow. Yes it does...and that works great!

Disregard my request for a feature that's already in place...and thank you for the heads up.
steveinor

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Is it possible to increase the limit of 9 simultaneous transfers? I have a high speed uplink, my target ftp server has a high speed inbound link. The limitation on transfer speeds is the latency across the net (from the West Coast to India). when I manually "execute now" more than 9, I see a significant improvement in utilized bandwidth. (I know that going too high will cause a drop in throughput... but 9 doesn't saturate any of the system or network resources involved.)

Thanks for the great work on winSCP!
martin
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steveinor wrote:
Is it possible to increase the limit of 9 simultaneous transfers? I have a high speed uplink, my target ftp server has a high speed inbound link. The limitation on transfer speeds is the latency across the net (from the West Coast to India). when I manually "execute now" more than 9, I see a significant improvement in utilized bandwidth. (I know that going too high will cause a drop in throughput... but 9 doesn't saturate any of the system or network resources involved.)

I 'm not sure if I want to allow users to make more than 10 connections to single server that easily. Moreover most FTP server wouldn't allow you anyway.
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Martin Prikryl
steveinor
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Joined: 2009-08-12
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Location: Oregon
Well, in my case, it works fine on both the sending and receiving ends. This provides a huge improvement in throughput for me. It would be great to have this happen "automatically" based on the settings rather than forcing it to happen with a series of "execute now" steps on each transfer. I suspect that this is just a constant change in the code, right?

Thanks!
martin
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steveinor wrote:
I suspect that this is just a constant change in the code, right?

Right. Though I have just tried to set the limit higher. Unfortunately, WinSCP became instable then.
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Martin Prikryl
steveinor
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Joined: 2009-08-12
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Location: Oregon
Thanks for checking into it, Martin.
Varun Raj

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prikryl wrote:
steveinor wrote:
I suspect that this is just a constant change in the code, right?

Right. Though I have just tried to set the limit higher. Unfortunately, WinSCP became instable then.


would it be possible to add an option somewhere that we could check or uncheck while downloading/uploading stuff from an SFTP/ftp server?

If we are allowed around 4 connections per file it should help a lot
martin
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Varun Raj wrote:
would it be possible to add an option somewhere that we could check or uncheck while downloading/uploading stuff from an SFTP/ftp server?

If we are allowed around 4 connections per file it should help a lot

This request has been added to tracker.
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Martin Prikryl
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