Re: Curl's network performance is slower than IDM.

Daniel Stenberg <daniel_at_haxx.se> 于2020年6月16日周二 上午5:44写道：
>
> On Sun, 14 Jun 2020, Hongyi Zhao via curl-users wrote:
>
> > On Ubuntu 20.04
>
> I presume that's curl 7.68.0 ?

$ curl --version
curl 7.68.0 (x86_64-pc-linux-gnu) libcurl/7.68.0 OpenSSL/1.1.1f
zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.2.0)
libssh/0.9.3/openssl/zlib nghttp2/1.40.0 librtmp/2.3
Release-Date: 2020-01-08
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps
pop3 pop3s rtmp rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: AsynchDNS brotli GSS-API HTTP2 HTTPS-proxy IDN IPv6 Kerberos
Largefile libz NTLM NTLM_WB PSL SPNEGO SSL TLS-SRP UnixSockets

>
> > $ curl -L -x socks5h://127.0.0.1:10119
> > http://speedtest-ny.turnkeyinternet.net/1000mb.bin >/dev/null
> > % Total % Received % Xferd Average Speed Time Time Time Current
> > Dload Upload Total Spent Left Speed
> > 46 1024M 46 475M 0 0 9.7M 0 0:01:44 0:00:48 0:00:56 11.1M^C
> >
> > The IDM gives around 16 ~ 20 MB/s speed.
>
> Are these transfer speeds somewhat stable and reliable in repeated tests?
>
> Do the same symptoms reproduce even if you don't use a SOCKS proxy? What's the
> theoretical maximum speed for you against this URL? From my dev machine in
> Sweden, my curl reached 30MB/s from this URL.
>
> > I'm confused on the above results. Why IDM shows a higher network
> > performance than curl? Are there some bottlenecks/glitches/bugs in curl's
> > network transfer algorithms?
>
> I'm not aware of any. Reading on the IDM site, it seems very content about its
> use of multiple connections and ranges to download data. Have you verified
> that your test case with that actually only uses a single TCP stream? Just so
> that we compare the same things.
>
> --
>
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-- 
Hongyi Zhao <hongyi.zhao_at_gmail.com>
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