So is it possible for me to do A and B using cURL?
On Wed, May 22, 2013 at 6:49 PM, Daniel Stenberg <[email protected]> wrote: > On Wed, 22 May 2013, Ben Thomas wrote: > >> Does anyone know of any ways I can speed up cURL, preferably without >> having to upgrade to a new version as I really struggled to get my version >> upgrading when I tried a while ago! But obviously I will if I have to to get >> it working. > > > This is because SFTP is a tricky protocol in combination with how libssh2's > API for SFTP works. In order to get the best possible speed out of SFTP > transfers with libssh2 an application needs to: > > A) use really larger buffers, like several hundred KBs at least > > and > > B) use a sliding buffer technique instead of letting the existing buffer > drain completely before it gets refilled > > (I'll explain why _this_ is necessary some other time. I blogged about some > SFTP and libssh2 details back in the day here: > http://daniel.haxx.se/blog/2010/12/08/making-sftp-transfers-fast/) > > If you use libssh2 directly and do the above two adjustments, you can > achieve SFTP transfer speeds close to OpenSSH's sftp tool. > > None of these things are made within libcurl, that instead use a mere 16KB > buffer and a draining-buffer technique so it has no chance of reaching high > speeds with the current libssh2. > > -- > > / daniel.haxx.se > > ------------------------------------------------------------------- > List admin: http://cool.haxx.se/list/listinfo/curl-library > Etiquette: http://curl.haxx.se/mail/etiquette.html ------------------------------------------------------------------- List admin: http://cool.haxx.se/list/listinfo/curl-library Etiquette: http://curl.haxx.se/mail/etiquette.html
