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The Outing of Pranknet

jadel Re:these are not pranks! (543 comments)

Good point. Unfortunately I can't edit the post to correct the error.

about 5 years ago
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The Outing of Pranknet

jadel Re:these are not pranks! (543 comments)

Lenin and Stalin was also enamored with Lysenko. This lead to the imprisonment and execution of a number of Russian geneticists.

From the wikipedia article:
"In 1948, genetics was officially declared "a bourgeois pseudoscience"; all geneticists were fired from work (some were also arrested), and all genetic research was discontinued. Nikita Khrushchev, who claimed to be an expert in agricultural science, also valued Lysenko as a great scientist, and the taboo on genetics continued (but all geneticists were released or rehabilitated posthumously). The ban was only waived in the mid 1960s."

about 5 years ago
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Windows Server 2008 One Year On — Hit Or Miss?

jadel Re:No news is good news (386 comments)

* The Vista performance/health monitor is actually pretty good, and provides a really handy ntop-like interface for seeing which service is doing what with the network (not as fine grained as I'd like, but it's a good starting point).

You are referring to the performance monitor that appears in server manager? For some reason I can't leave that monitor running on our systems, because it slows the rest of the system down to a crawl.

more than 5 years ago
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Windows Server 2008 One Year On — Hit Or Miss?

jadel Re:whats it give us? (386 comments)

I can confirm that it handles AD quite effectively, having recently set one up. ACL support took a bit of fiddling to get setup how I wanted it, but once I got my head around the differences between the way POSIX, windows and Novell ACLs work I found it remarkably easy to operate. The UID issue was not a problem since I am only running a single server.

more than 5 years ago
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Why Use Virtual Memory In Modern Systems?

jadel Re:You mean physical memory right :-) (983 comments)

Those are two slightly different costs though - you can have virtual memory without necessarily using context switching and vice versa.

more than 5 years ago
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Why Use Virtual Memory In Modern Systems?

jadel Re:You mean physical memory right :-) (983 comments)

I just finished a sizable essay on this for my operating systems class, so its fairly fresh in my memory.

In modern processors, there is no penalty for using virtual memory, all translation from virtual to physical address space is done internal to the processor and you won't notice the difference.

No quite - Your thinking of the Translation Lookaside Buffer, it can do the conversion from real to virtual address within a clock cycle, but has a limited capacity. When an address is requested to a page not contained in the TLB a much longer operation is required to convert the address from scratch. Further requests to that page will be fast until it drops out again.
Many CPUs can populate the TLB in hardware, but no operating system seems to use this support - doing the conversion in software. The TLB works well right up until there is a context shift that requires the entire contents to be flushed. Then memory performance will be poor until the TLB is repopulated.

more than 5 years ago

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