Re: [PECL-DEV] ssh2 / performance issue

On 28.09.2024 at 16:30, [email protected] wrote:

> After I got ssh2 running, I'm struggling with performance issues.
>
> Same file, same server system (Ubuntu), same client system (Ubunut), sam=
e
> network connection, only difference is the transfer protocol - sftp vs.
> https.
>
>
>
> File to download:
>
> Size: 33.6 MB
>
> Type: Zip file
>
>
>
> Download time
>
>  with ssh2/sftp: 45 sec
>
> with wget/https: 1.6 sec
>
> with openssh-client/sftp: 6 sec
>
>
>
> That's quite a huge difference!
>
> I played around with the buffer_size of the input stream but no improvem=
ent
> was achived.
>
>
>
> $buffer_size =3D 64*1024;
>
> $j =3D 0;
>
> while ($data =3D fread($remote_stream, $buffer_size)) {
>
> ++$j;
>
> fwrite($local_stream, $data);
>
> }
>
> echo $j;
>
>
>
> The data is received in 4314 buffers, which indicates the chunk size the
> server is using to transfer data is 8k (33.6 * 1024 * 1024 / 4314). So
> setting buffersize on the client side or in ssh2 seems to have no effect=
.
>
>
>
> The results make me conclude the problem can't be sftp as such nor the
> server. So it's probably me :-) Is there anything performance-wise I'm
> missing? Something in need to tweak in the PHP configuration? .. ?

I suggest you open a ticket at
<https://github.com/php/pecl-networking-ssh2/issues>.  Or maybe ask on
<https://stackoverflow.com/>.

Christoph