Re: [opensuse] systemload / cpu's

Per Jessen said the following on 03/20/2010 12:43 PM:


Until you have enough load to use up more cores, there's no need to use
them.

Its not simply "load", its the nature of the load.

Multiple cores make sense for the big servers where there are many
simulates unblocked threads of execution.

For a desktop machine where there is, for the most part, 'just you'
running the foreground task, they offer little advantage.

Yes, you may be running a download in the background, but that's going
to be IO limited, not CPU limited.

In fact most of the time your computer is waiting for you to it a key.

Yes, there are situations where you might need more "cpu power", but
stop and think if the situation is really CPU-limited or IO-limited.

The example Hans gave got the right answer from Per.
The code for those applications is not multi-threaded.
It _could_ be, perhaps, but it isn't. Yes, 'rsync' could be written as
a producer-consumer pair of processes, but it would become more
complicated, more prone to design and logic errors and less 'general'.
Do you want to optimise it for two cores, and them repeat Hans' complain
when you are running a 4-core desktop?

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