I want update my linux in one shell but by default wget or axel in updater use all the bandwidth.
How can I limit the speed in this shell?
I want other shells to have a fair share, and to limit everything in that shell – something like a proxy!
I use Zsh and Arch Linux.
This question focuses on process-wide or session-wide solutions. See How to limit network bandwidth? for system-wide or container-wide solutions on Linux.
Have a look at trickle a userspace bandwidth shaper. Just start your shell with trickle and specify the speed, e.g.:
trickle -d 100 zsh
which tries to limit the download speed to 100KB/s for all programs launched inside this shell.
As trickle uses LD_PRELOAD this won't work with static linked programs but this isn't a problem for most programs.
http://lartc.org/wondershaper/
It is in Ubuntu / Debian repositories, probably others too. It limits not just a single shell, but the whole machine. Never tried it myself though
The man page for wget provides the following information:
--limit-rate=amount
Limit the download speed to amount bytes per second. Amount may be expressed in bytes, kilobytes with the k suffix, or megabytes with the m suffix. For example, --limit-rate=20k will limit the retrieval rate to 20KB/s. This is useful when, for whatever reason, you don't want Wget to consume the entire available bandwidth.
The trickle solution did not work when I wanted to test https://github.com/myshell-ai/OpenVoice, it downloaded a lot of data with conda (miniforge) / pip which prevented me browsing Internet at the same time.
However I found another solution by limiting the bandwidth with Squid proxy, I had to add for example this data in /etc/squid/squid.conf for 128 kbps (16 kB/s) like explained on https://superuser.com/questions/66574/how-to-throttle-bandwidth-on-a-linux-network-interface/285721#285721 before restarting Squid (I later increased the values to half of my Internet connection speed):
delay_pools 1
delay_class 1 1
delay_access 1 allow all
delay_parameters 1 16000/16000
Then in the shell, I just had to use the proxy like this:
export http_proxy=http://localhost:3128; export https_proxy=$http_proxy
