Feature Request - Load Throttling

jw schultz jw at pegasys.ws
Wed Feb 18 01:54:58 GMT 2004

On Tue, Feb 17, 2004 at 03:16:32PM -0800, Marc Perkel wrote:
> If you aleady are doing this - then thanks. But here's a feature I'd 
> like to see.
> Rsync often puts a lot of load on the system because of high disk 
> access. I'd like to see rsync become "load aware" and to slow itself 
> down under high load levels. Seems to me that it could be something 
> fairly easy to add to have it check the load levels and back down so as 
> not to slow down the system.

This is what process and i/o schedulars are for.

In most cases rsync is i/o bound.  Either disk or network.
That means it spends most of its time sleeping already.
This becomes increasingly true as the performance gulf grows
between CPU and that of memory, disk and network.

Perhaps you have a suggestion for defining what constitutes
high load and how to determine that on all the different
platforms?  Hint: load average is meaningless.

	J.W. Schultz            Pegasystems Technologies
	email address:		jw at pegasys.ws

		Remember Cernan and Schmitt

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