tomaswolf commented on issue #485:
URL: https://github.com/apache/mina-sshd/issues/485#issuecomment-2059918256
Thank you for this test case. It appears that there is indeed something
wrong with the `FileChannel`s. The following is in my tests much faster (and on
par with OpenSSH or Jsch):
```
SftpClient sftpClient =
SftpClientFactory.instance().createSftpClient(session);
try (OutputStream out = sftpClient.write("largeFile")) {
Files.copy(new File(largeFile).toPath(), out);
}
```
or also
```
try (SftpFileSystem fs =
SftpClientFactory.instance().createSftpFileSystem(session)) {
Path remoteFile = fs.getPath("largeFile");
Files.copy(new File(largeFile).toPath(), remoteFile,
StandardCopyOption.REPLACE_EXISTING);
}
```
With the channels and `transferTo` I see uploads (to localhost, so no
network latency) about 4 times (400%) slower, and downloads about 25% slower.
We'll have to investigate what's going on there...
What is the JSCHED library?
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