Re: Remote SFTP File Open (SSH_FXP_OPEN) speed optimisations

[Does Itwork <doesitwork@xxxxxxxxx>]

 Understood. To help rule out any client side causes, what's the best way to figure out where the libssh part of our client is spending time when sending & receiving the response to a file open request on the remote server?
Unfortunately we have no access to the server (it belongs to an external third party), though we believe it is an IBM product.
Many thanks.
    On Monday, 15 June 2020, 10:40:57 BST, Jakub Jelen <jjelen@xxxxxxxxxx> wrote:  
 
 On Fri, 2020-06-12 at 14:55 +0000, Does Itwork wrote:
> Hi, 
> 
> Are there any tricks or settings in libssh that could speed up slow
> file opens of a new file on a remote sftp server?
> When we retrieve files in a time sensitive application using libssh,
> the sftp file open command(SSH_FXP_OPEN) takes much longer to
> complete than the actual read(SSH_FXP_READ) of a small amount of data
> from the file (50-100 bytes)  - open: 16-60ms vs read: <2ms.
> Many thanks.

Hi,
this will probably depend on your sftp server implementation and will
certainly need some more investigation where the server (or client) is
spending time when processing (or sending) this request.

Regards,
-- 
Jakub Jelen
Senior Software Engineer
Security Technologies
Red Hat, Inc.