Bug 12942 - Traffic shaping: Make --bwlimit dynamic
Traffic shaping: Make --bwlimit dynamic
Status: NEW
Product: rsync
Classification: Unclassified
Component: core
3.1.3
All All
: P5 normal
: ---
Assigned To: Wayne Davison
Rsync QA Contact
:
Depends on:
Blocks:
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Reported: 2017-08-01 07:47 UTC by kapotuc
Modified: 2017-08-02 07:35 UTC (History)
0 users

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Description kapotuc 2017-08-01 07:47:28 UTC
It would be great to be able to modify the value of --bwlimit while rsync is already running. Perhaps with a signal sent to rsync?

Other idea:
--bwlimit-from-file=/tmp/bwlimitvalue.txt
$ echo "200K" > /tmp/bwlimitvalue.txt
Comment 1 roland 2017-08-01 11:05:24 UTC
see https://bugzilla.samba.org/show_bug.cgi?id=7120
Comment 2 kapotuc 2017-08-02 07:35:36 UTC
Hi Roland, thanks for your help. I looked at your solution:

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export RSYNC_RSH="sh -c 'pv -qL10k | ssh \"\$@\" | (pv -qL11k; kill \$\$)' ssh"

Of course using $$ was the lazy way out, should kill pv instead but how to obtain the pid in a oneliner?
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Two remarks:

(1) You can easily get the pids of pv with: pv --pidfile /tmp/foo; and then you will do: kill $(cat /tmp/foo).

(2) The solution does not work well. If I start a transfer at low speed and I raise the speed (with pv -R [pid] -L [speed]), it works. But if a network transfer runs with high speeds and if I decrease the speed afterwards, I don't see any immediate effect. Sometimes I see it 20 minutes later... So I cannot regard this as a good solution; a "dynamic" --bwlimit option is needed.