Domain: blogspot.pt
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Comments · 10
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Re:Windows...
Actually, you can. The Linux CPU scheduler is pluggable by design, and several schedulers are available to choose from in the stock kernel. Con Kolivas was an active kernel developer for many years with a vested interest in improving kernel latency. He was one of the prime motivators behind a redesign of the scheduler to make it more suited for desktop use. And even after he stopped working on the main kernel, he maintained a few of his own out-of-tree patches, including the infamous Brain Fuck Scheduler (BFS). You can read about it here,
http://ck.kolivas.org/patches/...The main argument between CK and the rest of the kernel team was that CK wanted extremely good latency in the linux kernel, and he wanted to set it up in a way to be configurable, so you could purpose a machine for a specific task (desktop or server) with different priorities. The main kernel team (Linus, Alan Cox, Greg Kroah-Hartman, Ingo Molnar, etc) wanted a more elegant solution. They wanted an intelligent CPU scheduler that could scale well depending on the load and hardware capabilities, with the idea being that a sysadmin should not have to think too much about it. A mainframe has very different hardware, but it also is used for a very different purpose, from a desktop machine, so the kernel should be able to realize that and figure out what it needed to prioritize. There were a few tuning variables exposed, but it was not supposed to require an extensive configuration. Also, they specifically had the developer workstation in mind when they were working on the scheduler. That is, they were considering situations where a user likely wanted both interactivity and throughput performance. The best of both worlds as best they could manage. They went back and forth a few times until CK finally got frustrated and left, because he didn't think it was possible.
So, there is BFS, and it probably still can be used to patch the stock kernel, but CK didn't design it to be pluggable. So if you patch your kernel with it, you will lose the other options, like the Completely Fair Scheduler (CFS). However, this thread on Stack Overflow might be a good resource if you are either interested in writing a new scheduler, or you want to modify BFS to be pluggable.
https://stackoverflow.com/ques...And, I was Googling a bit and found that CK is apparently working on another scheduler (MuQSS) which he is intending to be the successor to BFS,
http://ck-hack.blogspot.pt/201...In the end, though, while CFS is not as good as BFS at latency, it strikes a pretty good balance. And GKH has been working on soft realtime patches to the kernel for a number of years that are slowly getting incorporated into the main branch. So Linux is pretty good in general; much better than it was when CK first started his work. Here is an old, but nice, comparison of the two schedulers,
http://cs.unm.edu/~eschulte/cl... -
Standard deviation
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Best of management
This is the best book about management: http://booksliteraryreviews.bl...
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Obelix & Co
I suggest http://booksliteraryreviews.bl...
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Boolean search
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Boolean search
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Re:LOL...Python
I showed you how you were incorrect when describing languages as "performant", which was all I wanted to point out.
But in any case: http://morepypy.blogspot.pt/2013/05/pypy-20-alpha-for-arm.html
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Re:Crap
You are still thinking in a big and central power generation system. you need weaker ones, but close to those how need it.
As for "enough power", hydraulic have enough power in many countries (who have big rivers), but those without rivers and mountains might be hard...
... but wind have enough power output is most places... Portugal and Spain already went above 50% wind generation of all power produced, using big and improved wind mills (check this and this ). Most places in the world have windy spots that can be "farmed"
If you have dams "near" you can use the excess wind to pump upstream water, that will be used later when there is a need for more power of the wind is weaker.yes, its possible that there is no win, but its also possible that the clouds break the solar power output. Nuclear and biofuel/biomass can be used on that time
finally, the current batteries arent the future. Unless there is a big change, biofuel and Hydrogen/ ("manufactured") Metane will be the future for cars. Batteries right now are very expensive, heavy and die too fast. they are good enough for a hybrid car, but not so much for a 100% electric car
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the bilderberg boy was arrested?
too bad!
it's just another color revolution attempt by the CIA boys and girls....
http://landdestroyer.blogspot.pt/2012/08/russian-punkers-get-2-years-jail-for-us.html
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Re:Looks good for testing
I see your point, but I disagree. I consider it better to have the webserver running slowly than having it crash because it ran out of memory. To do that might be a choice, but you could just go here ( http://unixfoo.blogspot.pt/2007/11/linux-performance-tuning.html ).