So - if rsync could watch the load levels and pause every now and then to put a little space between disk access at high load levels it would make it a lot friendlier to the system. The reason nice doesn't work is that once the system call is made to access the disk - nice doesn't apply.
jw schultz wrote:
On Tue, Feb 17, 2004 at 03:16:32PM -0800, Marc Perkel wrote:
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.
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