Domain: cam.ac.uk
Stories and comments across the archive that link to cam.ac.uk.
Comments · 1,846
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Re:breeding longer lifespans
Actually, if you will refer to Dr. Aubrey de Grey's work on Strategies for Engineered Negligible Senescence http://www.gen.cam.ac.uk/sens/ you will find that this is not entirely true. Also I feel that what everyone seems to be overlooking in this discussion is that evolution is merely the change in genes over time within a population. It is not inherently adventageous to the organism. That train of thought is called a "teleological assumption" which is a very nasty thing to make in the Biology community. "Evolution" doesn't necessarily make it any easier for an organism to survive, but it surely can. Deleterious mutations, while usually weeded out can and do get passed along, and that is evolution too.
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Mouse worth $3,312,296
The Methuselah Mouse Prize (MPrize), is the premiere effort of the Methuselah Foundation and is being offered to the scientific research team who develops the longest living Mus musculus, the breed of mouse most commonly used in scientific research. Developing interventions which work in mice are a critical precursor to the development of human anti-aging techniques, for once it is demonstrated that aging in mice can be effectively delayed or reversed, popular attitudes towards aging as 'inevitable' will no longer be possible. When aging in mice is shown to be 'treatable' the funding necessary for a full-line assault on the aging process will be made available. This is the true power of the Methuselah Mouse Prize, to demonstrate a proof of principle, and give hope to the world that decline in function and age-related disease are no longer guarantees, for us, or for future generations, if we work together now.
Methuselah Mouse Prize (MPrize)
SENS (Strategies for Engineered Negligible Senescence) -
Re:It needs one more room
charts and graphs are meant to be compiled --- use R. Seriously though, it's
got a bit of a steep learning curve, but overall, it's pretty useful. Generates
prettier graphs, too. The price is just as good as oo.o's, as well.
I noticed some folks have mentioned Edward Tufte's work with graphs too, and
there's some work done to generate Tufte-esque graphs from R. I've been playing
around with some myself after reading his books.
One of them is here:
http://www.cl.cam.ac.uk/users/sjm217/projects/grap hics/fancyaxis.html -
Re:Some contributions of Algol60
1. The Report on the language used a formal syntax specification, one of the first, if not the first, to do so. Semantics were specfied with prose, however.
Unfortunately this is the case with all programming languages (with the exception of standard ML).
Not all others -- for example, LISP 1.5 originally had its semantics defined in terms of actions taken by a LISP interpreter (written in LISP, of course).
There have been a few more with formally defined semantics as well. SPARK and the current Scheme spec (R5RS) both have formally defined semantics. A few others are open to some question -- for example, the VLISP project did a formal definition of the semantics of Scheme, and then did a verified implementation. Unless I'm badly mistaken, that's what led to the formal semantics in the current Scheme spec. Whether VLISP qualified as its own language or not is open to some question though.
Attempts have even been made for C. During the C standardization process, some work was done on a (non-normative) appendix defining its semantics formally as well, but this didn't make it into the standard. I don't know if the last version is still avaiable, but I believe it was based on this paper by Michael Norrish
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Re:Try SUSE, and a note about specsThat's cool, thanks for letting me know
:-) I'm glad you had some success.You may (or may not...) have some success getting her Windows install to run inside Xen (which is included in SuSE 10). Then she would have the best of both worlds. Xen is not an emulator like WINE, but more like a virtual PC environment like VMWare. (So, you would install Windows on the PC along with SuSE, and then have Xen boot into Windows from inside SuSE -- apparently you get nearly native speed, but I have a bucket of salt...)
I haven't played with Xen yet, so I can't recommend it, and it might be a fiddle to get it going, don't know. But it's something to keep in the back of your head for next time, maybe...
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Re:Replace unsupported hardware?
Universities don't tend to have bleeding edge workstations.
My college at Cambridge just got some new desktops. They're dual-P4 systems with a gig of RAM each, and they're primarily used for word-processing and surfing the net. Guess how long they take to go from Windows' login screen to a usable desktop?
FIVE GOD-DAMN MINUTES?!?!?!?!??!!
*beats head against desk*
This is while the Engineering department use Knoppix (well, MDP) workstations that take 5-10 seconds to log on to and are just as usable....
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Re:Migration
He he he, nope, that's what you do with LV's. xen's para-virtualizing allows you to move them while they are still running, really
;). http://www.cl.cam.ac.uk/Research/SRG/netos/xen/rea dmes/user/user.html Check out the introduction "Live migration of running virtual machines between physical hosts." Xen is going to mess with your head. Can you pass me that freebsd server when your done with it? -
Trusted Computer another first for Apple?Can anyone imagine Steve Jobs giving one of his famous presentation explaining Apple's adoption of Trusted Computing? Would you be convinced? Why are Apple fans (of which I'm one) so unintested in Apple adopting this technology? What features of Trusted Computing does Apple's MacBookPro chipset support and how could they be utilized in future versions of OSX? Which Trusted Computing features does the current X86 port of OSX already use? This is not about tinfoil hats anymore - TC will be the end of hacking.
PS: This submission to
/. was rejected so I'm posting it here - f*ck them and f'u if you think it's 'off-topic'...Sincerely - Ransu, Finland
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Trusted Computer another first for Apple?Can anyone imagine Steve Jobs giving one of his famous presentation explaining Apple's adoption of Trusted Computing? Would you be convinced? Why are Apple fans (of which I'm one) so unintested in Apple adopting this technology? What features of Trusted Computing does Apple's MacBookPro chipset support and how could they be utilized in future versions of OSX? Which Trusted Computing features does the current X86 port of OSX already use? This is not about tinfoil hats anymore - TC will be the end of hacking.
PS: This submission to
/. was rejected so I'm posting it here - f*ck them and f'u if you think it's 'off-topic'...Sincerely - Ransu, Finland
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Re:Flipping the question around...
Perhaps a mechanical vote counter is the answer.
Let's hear it for Babbage !
Diebold can't make a robust ATM network
http://www.cl.cam.ac.uk/~mkb23/phantom/
And they are trusted to help decide on the govt. of the biggest war machine ever.
Try not to think of that one too much when you goto bed tonight. -
Re:*THIS* is what FOSS is all about.
You won't even be able to use your OSS tools on a "trusted computing" platform. That's the whole point.
Actually, that's completely wrong. Untrusted OSS tools simply wouldn't be able to access the the "trusted" memory pool or interact at all with "trusted" components. See this FAQ. -
Re:Biased article?
I was quite depressed reading an article like this, it seems we're on the slippery slope to all sorts of mischief, slowly as you say. eg1 eg2
Then again, we can always rely on organisations getting too greedy too quickly. If software piracy is greatly reduced (how many people have actually paid $600 for Photoshop to edit a couple of wedding photos?) this may mean a mass migration to F/OSS software, which could represent too large a userbase for vendor lock-in to be a viable prospect.
When Microsoft brought in Product Activation for Windows and Office how much of the savings on piracy was fed back to customers in the form of lower prices? (clue, the answer is negative!) -
Re:Universities and schools
Linux is ok for openoffice, internet, mail and programming, but if you actually want to *do* something with the computer that isn't programming there's no wealth of professional grade software out there for professionals who are reliant on computer technology.
There's a lot of professional grade software out there for professionals that runs as well or better on Linux than on any other operating system:
- Pro Engineer
- Various Cadence microcircuit design toolkits (schematic capture, mask layout, simulation)
- Xilinx FPGA design & synthesis tools
I could carry this list on for a long time, and that's just in my field. I keep on having to repeat myself: for high-end engineering research and development, people are upgrading to Linux all the time.
Cambridge University Engineering Department use Linux workstations for all undergraduate tuition -- they're based on a custom Knoppix distribution. More information at the CUED website.
Professional software for professionals: lots of it for Linux. Maybe you mean "professional" software for amateurs?
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Re:nonsense
It'd probably be easier to get the US using A4 paper first.
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Plausible deniability with StegFS for Linux
Anybody know if StegFS described in http://www.cl.cam.ac.uk/~mgk25/ih99-stegfs.pdf/ is actually available? Plausibility deniability of the knowledge of keys to unlock deeper levels of encyryption is an explicit goal of the project.
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Re:Tower
I recommend anyone who seriously thinks that engineering in nanotubes translates to macro-scale realisations of their THEORETICAL strengths needs to go right back to remedial materials engineering class. The sooner we stop pissing money at this doomed project and start looking at those materials which do exhibit the same mechanical properties in nano-scale and bulk samples, the better.
Probably the most succinct and easy to follow explanation of why carbon based materials for this application is areally, really bad idea is right here;
http://www.msm.cam.ac.uk/phase-trans/2005/MST7118. pdf/
It's really disheartening when otherwise sensible people wet themselves at the mere thought of how carbon nanotubes will shore up economies, end world hunger and bake a better pizza. -
Re:Why use the back door...?
Ross Anderson is one of the worlds leading security researchers, check his site.
This has surprised me actually, as he's not exactly pro TCPA. -
Re:Why use the back door...?
Ross Anderson is one of the worlds leading security researchers, check his site.
This has surprised me actually, as he's not exactly pro TCPA. -
Decide for yourself
Although I don't know the man, I just looked up what I think is his blog, and provided he's not lying through his teeth, the Politics and Public Policy section of his blog seems quite agreeable in spirit to me.
He also has some really interesting papers on there. (Check out the "Cocaine Auction Protocol" and "Programming Satan's Computer" -- the first is a methodology for creating an un-mediated auction house, the latter is about programming on untrusted networks.)
Of course, to each his own.
Here's the link:
http://www.cl.cam.ac.uk/~rja14/#Lib -
This sounds like misreporting to me
That article surprised me rather - because I know Ross Anderson to be one of the Good Guys. He is opposed to DRM, Trusted Computing, (see here) and ID cards. Furthermore, even if he has had a change of heart, he's far too smart to advocate a backdoor into encryption.
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Re:RFID != Smart Card
http://www.cl.cam.ac.uk/~gh275/ is worth a look too.
Describes attacks on contactless smartcards, a subset of RFID devices. -
RFID cloning and power consumption attacks
That cloning device only works on cheap RFID's that don't do cryptographic authentication. This is not the first time this has been done.
http://www.cl.cam.ac.uk/~gh275/relay.pdf
The method Shamir talked about is a little more interesting because the cards are leaking information wbout what they are doing internally. It is possible that a more detailed examination of the power consumption may reveal other detail of what the card is doing as well as when it things it has receive a bad bit.
Power analysis has been a known attack on smartcards for a long time. A few cards were vulnerable to an attacker looking for increase current draw just after a PIN/password attempt when the card tried to increment a count of the number of failures, cut the power when it tries to write to the fail count and you could attempt a brute force attack. I believe the most obvious way around the problem, to decrement the counter before checking the PIN and increment it after if the check passed, is patented.
It would be interesting to see if any RFID cards have that flaw. -
Re:Moore's "law"
It may be true that Moore's law became the industry expectation, but given the winner-take-all nature of semiconductor manufacturing I have a hard time believing that IBM/AMD/Intel etc are simplying "developing to the timeline".
Specifically they are developing to the International Technological Roadmap for Semiconductors (ITRS), which is produced by the Semiconductor Industry Association (SIA), of which Intel, AMD, IBM, etc are members. This is the little-known [by the public] pre-competitive stage of the semi-conductor industry in which they all get together and collaborate on developing a "best available industrial consensus" on the way that the industry should move forward (choice of semiconductor technologies, etc).
This lecture by Sir Maurice Wilkes http://www.cl.cam.ac.uk/~mvw1/Progress_in_Computer s_IEE_Cambridge_2004_web.pdf contains details. -
Stirmark
AFAIK all published image watermarking systems are not robust.
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Re:in the business
AFAIK all published watermarking systems are not robust. As for non-published methods, the video pirates enthusiastically applaud the use of 'security through obscurity.'
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Re:Human?StirMark is a GPL'd watermark destroyer.
As far as the watermarking tools themselves, all the ones I'm aware of are proprietary (patented and/or trademarked.) They are certainly not open source. If you think about it, that's the only way watermarking software can ever be made practical. Watermarking is 100% "security through obscurity." Once an attacker is aware of a watermark, that watermark can be tampered with and/or destroyed. But GPL'd code is not obscure: it is transparent by fiat. So anyone attacking an open source watermarked document would either completely undo the mark or completely and perfectly obscure the meaning of the mark.
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Re:Missing Something
There's a basic explanation of the known forces (Strong, Electronmagnetic, Weak and Gravity
There are quite a few ideas kicking about:
scalar-tensor-vector gravity (STVG)
Modified Newtonian Dynamics
General Relativity,
Quantum Gravity,
The http://www.halexandria.org/dward155.htm">Zero-poin t Field,
Superstring Theory,
M-theory,
Inflation/Cosmology,
Yilmaz gravitation, and
Membrane Gravity
Law of Universal Gravitation,
And there's also Intelligent Gravity
Unfortunately, there is no one simple experiment to prove any of these either true or false. -
Re:Missing Something
There's a basic explanation of the known forces (Strong, Electronmagnetic, Weak and Gravity
There are quite a few ideas kicking about:
scalar-tensor-vector gravity (STVG)
Modified Newtonian Dynamics
General Relativity,
Quantum Gravity,
The http://www.halexandria.org/dward155.htm">Zero-poin t Field,
Superstring Theory,
M-theory,
Inflation/Cosmology,
Yilmaz gravitation, and
Membrane Gravity
Law of Universal Gravitation,
And there's also Intelligent Gravity
Unfortunately, there is no one simple experiment to prove any of these either true or false. -
Re:Missing Something
There's a basic explanation of the known forces (Strong, Electronmagnetic, Weak and Gravity
There are quite a few ideas kicking about:
scalar-tensor-vector gravity (STVG)
Modified Newtonian Dynamics
General Relativity,
Quantum Gravity,
The http://www.halexandria.org/dward155.htm">Zero-poin t Field,
Superstring Theory,
M-theory,
Inflation/Cosmology,
Yilmaz gravitation, and
Membrane Gravity
Law of Universal Gravitation,
And there's also Intelligent Gravity
Unfortunately, there is no one simple experiment to prove any of these either true or false. -
Oh man......this should have been posted tomorrow for Troll Tuesday. It's a great troll.
Of course, he's right, but he's not taking into account that this won't matter in a few more years. Yes, people should back up. If they don't and they've been repeatedly warned then they only have themselves to blame for not heeding the warnings. It's still a tragedy though. One simple way to avoid it, is to make certain that you have a section of the file system that is NOT accesible to the user under normal circumstances. It is optimized for security and is impenetrable because it's not even connected to the net. Console access only. However, it has access to the user's files and is scheduled to do nightly backups. This should be a DEFAULT configuration for ALL OSes. And you know what? It will be. Thanks to full virtualization (Intel's VT AKA "Vanderpool" and AMD's "Pacifica"), this will happen in all future OSes. Security experts have predicted that future systems will run multiple VMs on top of a virtualization layer (VERY different from VMWare and Virtual PC as there is no guest OS) to provide secure environments and isolated environments. This stuff is coming fast and if you're not already up on it, you'd better be:
1. The Xen Project is the leader
2. Intel VT
3. AMD PacificaWake up! A big change is coming...
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Re:I'm Job Searching
Did you look at any universities outside the US?
Even then, the official syllabus can be rather misleading. For example, in the department where I studied CS a few years ago, Java is the language used for the kiddie introductory programming course. On the other hand, it's a good bet that 90% of the people who are taking that particular course for formality's sake already know pretty much everything in it and then some, and the more interesting courses use languages like ML, Prolog, etc.
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Re:Intel VT
I haven't seen any information that suggests shared storage is necessary. I skimmed this paper on the subject, and it appears that all that is necessary is a network connection so that the memory can be transferred.
Apparently they found it to be responsive enough to even work effectively with Quake 3 servers, taking about 60ms to get the new node operating. If you are talking about the data that must be accessed on disk, then how does VMWare skirt around the issue? Reliable shared storage may be expensive, but a virtualization cluster isn't exactly cheap either. -
Deal with it
Whether you believe humans are causing global warming, or don't effect it.
It's going to happen, so instead of bitching about it we can actually adapt to it.
Volcanic venting releases more than 130 million tonnes of CO2 into the atmosphere every year http://volcanoes.usgs.gov/Hazards/What/VolGas/volg as.html
We can begin to breed crops that are more resistant to drought and heat (which we already do anyhow http://www-saps.plantsci.cam.ac.uk/articles/broad_ biotec.htm)
Of course plants being more resistant to drought and heat would happen naturally because the plants that weren't would die leaving room for the ones that were to take over the land (natural selection :p), but we as humans can and have been speeding up the process.
Also no massive tidal wave is going to just overtake our coastal cities; we will have plenty of time to move out of the way of the raising water.
One street that can be looked at as well is with higher global temps, there will be higher global evaporation, which in turn will raise global precipitation. -
Re:Already true in the UK.
There is an article from FIPR which discusses this case, and some problems it introduces.
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Date format
Grrr, stupid date format, grumble, grumble. Why not use 2006-01-23? Here are all the reasons why you should.
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Re:What about switching the root cert?
The relevant keys may be stored in a "trusted platform module", a hardware device that is designed to wall off its contents from the owner of the computer. The TPM requirement (?) for Vista is one of the first steps in the so-called "trusted computing" scheme. TC is deceitfully promoted as "security", but is in fact a vast DRM and remote-control system. When ISPs start requiring it to be present and turned on as a condition of internet access, computers will be "trustworthy" from the viewpoint of the commercial software vendors and copyright cartel, but complete, treacherous trojans from the viewpoint of their owners, not only for music and movies but for communication as well.
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What about 'Trusted Computing'?Perhaps they're trying to prevent GPL'd software being modified to include TC features. According to this article: http://www.cl.cam.ac.uk/~rja14/tcpa-faq.html, such things could still stay within the letter of GPL as it currently stands:
"IBM and HP have apparently started work on a TC-enhanced version of GNU/linux. This will involve tidying up the code and removing a number of features. [...] Although the modified program will be covered by the GPL, and the source code will be free to everyone, it will not work in the TC ecosystem unless you have a certificate for it that is specific to the Fritz chip on your own machine. That is what will cost you money (if not at first, then eventually)."
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Perspective
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Re:Phase Change and ComplexityThe article says
:"This is the first time a computer program could simulate a phase transition because the computers would always bog down at what's known as the 'critical slowdown.' We figured out a way to perform a kind of end-run around that critical point slowdown and the results allow us to calculate certain critical point properties for the first time."
There have been previous methods to look at systems arbitrarily close to the critical point in phase transitions, and the article is misleading when it says this area has been off-limits to computers. I haven't read the actual Physical Review Letters article, but it appears the authors have come up with a novel algorithm, perhaps more ideally suited for fluids, to overcome critical slowdown. But this is not the first such algorithm, and there has been loads of prior computer simulation of phase transitions and critical phenomena to boot.For example, in the Ising Model or the Potts Model, one can examine system parameters arbitrarily close to the critical point, in finite time, using a Cluster Algorithm. This page gives some information on how the cluster algorithm. The page has a java applet graphically depicting the system for a variety of algorithms.
Just for completeness, here's an Ising model applet that I wrote, which doesn't just have a system animation, but allows you to calculate and plot data (specific heat, magnetization, etc) as the system passes through the critical point. This applet uses the Metropolis algorithm for time advancement, hence it is subject to critical slowdown. In that respect, the applet is flawed because close to the critical point I don't generate enough Metropolis iterations to ensure the subsequent frame is sufficiently thermally indepdent from the previous state. However, the cluster algorithm would remove these limitations. This applet has actually been used in graduate physics classes at Johns Hopkins to demonstrate magnetic phase transitions.
And also for completeness, here's a Potts model applet, but it doesn't acquire data for plotting like the Ising model. The Potts applet actually uses the Microcanonical ensemble, whereby the energy of the system is conserved, but the Ising applet uses the Canonical ensemble, where the system is in contact with a heat bath at some settable temperature.
And in case anyone's curious, these applets (except for the first one) are part of the Java Virtual Physics Lab , which contains a few different physics java simulations I wrote to help with conceptual understanding.
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Re:Thinking a bit more about this...
That's why computer programming is difficult, especially security-related computer programming: you have to deal with people doing unexpected things.
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Re:Windows?
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Re:What Can We Do ???
I highly encourage everyone to listen to a speech given by Richard Stallman on Software Patents.
Audio TranscriptI know RMS may not be too popular because of his stern disposition, but I find that he chooses his words very carefully and is very articulate. Note that he does reference "Society" quite often and many people mis-understand him because of this. To actually get where he is "coming from" you may want to read the first section of "Common Sense".
On the origin an design of Government in General -
Treacherous Computing
Don't be deceived by the headline! To see how ugly this beast really is, take a look at Ross Anderson's excellent TC FAQ http://www.cl.cam.ac.uk/~rja14/tcpa-faq.html. It's the best investment you can make (20 minutes) to get informed on computer ethics, and now is the time to be informed.
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Re:The hard way
You might be joking, but the US actually does want to abolish leap seconds. As a compromise to keep UTC somewhat in sync with UT1 (time as measured by astronomical observations), a leap hour would be inserted every 500-700 years.
I wish I were making this up. -
Re:Microsoft's involvementActually, I have read a lot of the facts--and opinions on what TPM can/will do. Here's a couple of links, if you care to look further at both sides of the question:
FAQ and Stallman's view at News Forge, and EFF and finally the Trusted home page here. So I have informed myself a little. Actually, the most recent MS EULA I had to read sugests that MS and 3rd parties they trust have the right to add and delete programs and files to my computer. Presumably, only for my benefit. Uh huh. The TPM chip takes this to the hardware level and is the real foundation of "Trusted Computing" or as some see it, "Treacherous Computing." Believe what you want to believe.
Like AC pointed out--and BTW, thanks AC, for standing up for my post, I've never been rated a troll before (that I'm aware of) & I'm chalking it up as another experience--ultimately if the TC roadmap is followed, it may be impossible to connect to the internet without a fully TC-compliant box. It may be impossible to share files--and I'm not talking about trivial rubbish like music or video, but important files like text documents, spreadsheets and other data--unless they were produced by a TC box and are opened on a TC box. If that's OK by you, then so be it--for you.
I'm not interested. I have been off & on the net for ten years, in fact I only got a confuser at home 10yrs ago, which isn't much over >50yrs. I can live without the net or a computer at home. Why would I want to use a computer that considers ME the enemy? Why would I even have such a device in my house??! I don't fear it, because TC has nothing to offer me or theaten me with:He is the master who has power over things which others wish to have or to avoid, the power to take these things away or bestow them: the power to inflict or to withhold. Whoever then wishes to be free, let him neither wish to have anything nor wish to avoid anything which depends on others. Who does not observe this rule, he must be a slave.--Epictetus
Your mileage may vary. -
XEN
xen is the king. ( http://www.cl.cam.ac.uk/Research/SRG/netos/xen/ ) Many ISP who prowide virtual hosting provide you a xen machine instead - you have a full root access in a chmod jail, they have several VMs w/o perf penalty. Not your case though...
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Funny...
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Regarding the power tangentWe've been using virtualization technology for some time, but not on production server systems. We are considering doing that now for a variety of reasons (not the least of which include facilitating software upgrades and disaster recovery by leveraging the hardware abstraction layer). Because we run a [un?]healthy mix of operating systems, we are currently looking at VMware, but perhaps OSDN is in a position for considering Xen? It might well help your power needs scale much better.
Isn't there some Computer Science adage about solving problems by adding another layer of abstraction?
--
Do we need more fiber to keep our network regular? -
Re:My Theory of Keyboard Design
http://www.msm.cam.ac.uk/phase-trans/2004/HIT4/HI
T 4.html/
search for "chinese typewriter" on that page. click the thumbnail for a larger image. it's frightening. -
Re:One word anwser
1) A vheclie epxledod at a plocie cehckipont near the UN haduqertares in Bagahdd on Mnoday kilinlg the bmober and an Irqai polcie offceir
2) Big ccunoil tax ineesacrs tihs yaer hvae seezueqd the inmcoes of mnay pneosenirs
3) A dootcr has aimttded the magltheuansr of a tageene ceacnr pintaet who deid aetfr a hatospil durg blendur
Sinrlrsigpuy, it's slitl pttrey rdlaaebe rhgit? All words are scrambled according to the rule of keeping the first and last letter fixed.
http://www.mrc-cbu.cam.ac.uk/~mattd/Cmabrigde/