cmp(1) has a bottleneck, but where?
dieterbsd at engineer.com
Tue Jan 3 01:29:30 UTC 2012
>> Task: cp(1) a several-GB file from one drive to another,
>> then run cmp(1) to verify. Cp runs as expected, but
>> cmp runs slower than expected. Neither the disks
>> nor the cpu is maxed out. Local drives, no network
>> involved. Machine is otherwise idle.
> 1. How are you running cmp?
> 2. Why do you claim cmp is the bottleneck? Is it spinning the CPU?
cmp big_file /other_disk/big_file
Cmp is running slower than it should. It isn't cpu bound ( 67.5%Idle )
but it isn't disk bound either. Seems like it should be one or the
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