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Re: Quick question.
On Tue, 3 Aug 2004, Alexei Roudnev wrote:
That is not about reliability. That's to do with software performance.In theory, yes. On pracrtice, 2 CPU improve behavior dramatically.
I was purely picking a, admittedly pedantic, nit with the notion that SMP == more reliable. I'm not trying to argue that SMP does not have other benefits (eg performance).
Nah, the big jump in complexity appears to be from no-concurrency to concurrency. After that initial hurdle, 2 to 4 to 8 CPUs isnt as big a deal (making it scale is though).4 CPU makes system too complex (as you wrote beloow).
New P-IV with multi threading may be a good selection - behave as 2 CPU system but is not so complicated as SMP.
From the OS POV, the complication is the same. And yes, evensingle-processors are today capable of presenting multiple execution contexts to software, and it seems to be a trend we'll see more and more of.
In reality, applications are less reliable on 2 CPU systems (if they have some kinds of bugs, which make sense on SMP only), so I agree with you in some cases.
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