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Why is the speed less than half of what i get in FileZilla? Why is WinSCP only downloading one file at a time (in both client and script)? What am i missing, what am i doing wrong? #FILEZILLA VS WINSCP SPEED WINDOWS#I thought this might be in scripting/shell mode only, but the WinSCP windows client has the same (slow) performance. Yes, speed depends on internet connection, but i'm comparing both on the same connection of course :) In WinSCP, only one file at at time is downloaded, and at a slower speed. So i downloaded two files totalling 50MB. In the default settings (i never played with any settings), FileZilla downloads two files at the same time! and it's showing a much faster speed. now, i can't script in that, but it's FAST. #FILEZILLA VS WINSCP SPEED DOWNLOAD#It works very well so far, BUT i only noticed now (now that i download more files more frequently for a task in my job): it's very slow #FILEZILLA VS WINSCP SPEED FREE#I came across WinSCP when i searched for a scriptable free SFTP download client. Once this limit is reached, no further chunks a read-ahead until a pending read is completed.I'm comparing the download speed of WinSCP (both script and client) vs FileZilla. If the file size cannot be determined, the maximum pending reads is set to 3. Maximum pending reads = MIN(10, ROUNDUP(file size / maximum chunk size) + 1) #FILEZILLA VS WINSCP SPEED PLUS#The maximum number of pending reads is the total size of the file to download divided by the maximum chunk size, plus 1 limited to 10: The definition for a pending read is a read-ahead that either the server has not yet responsed to, or for which the response has not been consumed. If we requested 16 KB of data, then the SSH_FXP_DATA payload of the SSH_MSG_CHANNEL_DATA message would be too big ( 16 KB + 13 bytes) to fit a single SSH_MSG_CHANNEL_DATA response.Īs a result, the SSH server would split the SSH_FXP_DATA over two SSH_MSG_CHANNEL_DATA responses: one containing 16384 bytes ( 13 bytes header, and 16371 bytes file data), and one with the remaining 13 bytes of file data. This a technique we generally apply because most SSH servers limit the size of the payload of a SSH_MSG_CHANNEL_DATA message to 16 KB. Maximum chunk size = MAX(buffer size, maximum packet size) - 13 The maximum size of a chunk that we read ahead is the configured buffer size (default is 32 KB) limited to the maximum packet size (which currently is 64 KB) minus 13 bytes (which is the protocol overhead of a SSH_FXP_DATA message): Here's some more info on the read-ahead implementation Maximum shunk size Reply to this email directly, view it on GitHub, or mute the thread. You are receiving this because you commented. If you can debug or instrument the code, it would be great to learn if much time is spent in KeyExchangeDiffieHellman.PopulateClientExchangeValue(). The "read-ahead" has more effect on slower servers and/or connections.īut even with these changes, I doubt throughput will increase in such a way that downloading a 28 MB file will go from 2+ minutes to 8 seconds. In case of the original issue reported by, I got around 250 KB/s against the server he used before my changes (while he claimed 70 KB/s).Īfter my changes - and based on preliminary tests - I got around 850 KB/s. I went from around 30 MB to 56 MB/s with my local SSH server.ĭo note that these changes are not yet available (not in beta1, and not even in the develop branch). This greatly improves performance, even up to a point where we're fasten than WS_FTP. I modified DownloadFile to read-ahead 10 chunks asynchronously. On Jan 19, 2017, at 3:16 PM, Gert Driesen wrote: tLog("Download concluido para pasta: " + strLcGz) SesConnection.GetFiles(strRmPath, strLcGz, false, toptStreamSettings) ToptStreamSettings.TransferMode = TransferMode.Binary TransferOptions toptStreamSettings = new TransferOptions() Using (WinSCP.Session sesConnection = new WinSCP.Session()) soptSettings.SshHostKeyFingerprint = "XXXXXXXX" SessionOptions soptSettings = new SessionOptions() tLog("Demorou " + timespan + " ms para baixar!") Var speed = size / timespan.TotalSeconds Var size = (new FileInfo(strLcGz).Length / 1024) / 1024 Var timespan = TimeSpan.FromSeconds((DateTime.Now - startTime).TotalSeconds) Using (Stream stream = File.OpenWrite(strLcGz)) tLog("Baixando: " + client.WorkingDirectory + strRmPath) tLog("Demorou " + TimeSpan.FromSeconds((DateTime.Now - startTime).TotalSeconds) + " ms para conectar!") Using (var client = new SftpClient("XXXXX", "XXXX", "XXXX")) I'm using the last versions of Both and VS2015 Nugget Plugins With WinScp plugin i have 1,6MB/s download speed, with SSH.NET my download is 70 KBPs or lesss, how i can fix this? ![]()
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