However, for our purposes, Windows Subsystem for Linux is too complex.Īnother possibility is Cygwin : an open-source project that provides a compatibility layer, allowing virtually all Linux applications to be compiled to run natively on Windows. WSL runs most native Linux utilities directly within your Windows environment. Microsoft provides a Linux compatibility option called Windows Subsystem for Linux, ( WSL ), a relatively complex Windows add-on used to emulate Linux within a Windows environment.
It's a little-known fact that virtually everything that runs on Linux can also be run on Windows. Since none of the free, native Windows FTP clients support segmented downloading, we decided to borrow an FTP client from Linux. The offset makes it easy to resume an interrupted download - and also makes it possible to split a file into multiple parts, downloading each in parallel, starting with a different offset position within the file. The FTP protocol supports specifying an offset into the file when starting a download. Each piece is downloaded in parallel, simultaneously (just like a multi-threaded download.) The difference is that a segmented download applies multiple threads to a single file, which accelerates download performance. Segmented download occurs when a single large file is broken into multiple pieces. Each file download runs in its own CPU process thread, independently of other downloads in progress. Multi-threaded vs segmented downloads Multi-threaded download involves multiple files being downloaded in parallel, simultaneously. Several commercial FTP clients are available (CuteFTP) but these are relatively expensive. Unfortunately, there aren’t any reliable, high performance FTP clients for Windows that are free to use. But if there’s a big discrepancy between the bandwidth and the network delay, even that 1 MB can be too small to saturate the bandwidth.FTP is the fastest method for downloading large files (such as virtual disk exports) from the cloud. For example WinSCP can request up to 32 chunks for 32 KB each at once, totaling 1 MB (these are defaults which can be altered with SFTPDownloadQueue and SFTPUploadQueue raw session settings).
Most SFTP clients (including WinSCP) overcome the problem by both requesting/sending a large chunk of the file in each single read/write request and by sending (queuing) multiple requests without waiting for a response to previous. If the client spends this time uselessly waiting, your transfer speed will be low. When transferring, the SFTP client (WinSCP) sends a read/write request to the SFTP server, waits for a response and repeats, until the end of the file.Įven if your connection is fast, if the server is far away (or slow), it takes a time for the response to arrive back.
Network delay/latency affects particularly SFTP, as it is a packet oriented-protocol.
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