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FTP Server CPU usage 90% when passive mode download file

Posted: 03/08/2016 04:55:41
by Peter Wu (Standard support level)
Joined: 12/02/2015
Posts: 8


I try to download file in FTP Passive mode from SecureBlackbox FTP Server.

Both my FTP Sewrver app and SecureBlackbox sample project, CPU usage up to 90%.

Is any way to control the CPU usage ?

PS: FTP Client is FileZilla
Posted: 03/08/2016 05:16:08
by Eugene Mayevski (Team)

The server provides the data as fast as it can, and on fast networks CPU load will be significant.

Did you do any profiling of your server to see, what processes / threads / operations take the most time?

Sincerely yours
Eugene Mayevski
Posted: 03/08/2016 20:46:09
by Peter Wu (Standard support level)
Joined: 12/02/2015
Posts: 8

Hi Eugene

The CPU usage is 0% when FTP SERVER stand-by.

4~10% when client login.

1~5% when browse folder.

10~20% when download file(1kb x 100) in avtive mode.

40~90% when download file(1kb x 100) in passive mode.

It will helpful if can control the CPU usage of passive mode download file.
Posted: 03/09/2016 02:46:01
by Eugene Mayevski (Team)

Thank you very much for your investigations. I have moved your question to the HelpDesk for further investigations. Maybe we need to do some socket tune-up.

Sincerely yours
Eugene Mayevski



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