I had completely forgotten about that.
Reminds me of the std "blue sky" storage solutions where there is no distinction between cache/volative/persistent storage; each level is merely a faster cache for the next level down.
Has anyone made this work, on a performance basis, or is it inherently blue sky.
Erm. I take that back. Further reading hints that while the modification is performed at mount time, it is apparently performed once only and modifies the underlying disk. It is unclear whether this is reversible.
Really. You entrust your mission critical data to ReiserFS? I must admit I didn't think it was mature enough for that.
How are the version updates to the fs code? Do you just recompile the kernel, or do you have to buy a new disk and copy the data from one format to the other?
I'm constantly stepping on the powerstrip and flicking main cutoff switch (don't ask -- small appartment) and killing my fileserver. Fsck of 25 gigs is no fun. It's getting to the point where I'm about to repartition and use apmd just to avoid rechecking all of it.
I thought it was very cool how Tux2 is implemented as a mount-time upgrade over ext2. This really increases my confidence in the system, as presumably it reuses all the low-level integrity routines.
Furthermore, should others report a bug before I suffer data loss, I can revert to plain old boring ext2 by just editing my fstab. Now that is a feature you don't get with other journaling fs (ext3? I'm not sure).
Has anyone produced a file system that was essentially a version control system
This is what net app has, I think.
Here at CCS, I believe our NFS needs are served by a net app server. Whatever it is serving them, it does automatic snapshots every hour, so that at any point you can access the.snapshot directory and find the state of your files one, two, three, four hours ago, and one, two, or three days ago, or one week ago.
So not quite a version system, but mighty cool.
And really useful. It lets you dive in with exploratory programming (as long as you for the top-of-the-hour so the stable code is snapshotted), cause restoring your files is as easy as cp.
I agree it would be cooler if you could request a snapshot of this tree now please, but systems informs me that this is not possible/too much hassle.
Do you really need to be able to type? Or would a keyboardless but w/ hard drive heavyweight PDA be what you want?
The picture book is almost what I'd want, but I think that if you could shave a couple of hours more into the battery life, and perhaps lose the keyboard for a touch screen at maybe 600x800 [sic] (instead of 1024x480) and also offer it for sub $1k, then my ears would really perk up. Before then, tho, the picture book is neither fish nor fowl.
Too big for every day use, too pricy for casual carrying around, too crappy battery life for extended use, and too small for real data entry.
I'd like to see what modern tech could do for the newton, which is not far from what I'm babbling about.
Since the government is the lender of last resort, the prime interest rate defines how much money they make from lending. Higher interest rates -> higher gvmt earnings.
How feasable would it be to completely remove taxes and only charge (higher, obviously) interest? This would remove alot of shoe-leather costs from the system, and also make avoiding taxes very hard (c.f. the recent revelations that microsoft et ali pay very little to none).
1) He does have a point, if poorly expressed
2) Invoking religion is cause for an almost immediate mark-down as a Troll (I notice that in the time it took me to load the page and press reply, this has already happened. But you knew it would).
3) Bashing religion is cause for an almost immediate mark-up as insightful.
so why bring up the subject at all if you know that its value to the discussion is marginal at best?
In sweden, I believe it is possible to vote blank. Choosing "e) none of the above" is a way of expressing dipleasure with the process.
It actually harms the other parties (you vote for party, not person) because of how seats in parliament are distributed per percentage of votes of all votes counted. Thus, voting for "e)" could be seen as voting for unspecified third party candidate (or 6'th or so in sweden, I forget how many big parties there are these days).
Anyway, I like the idea that you can basically vote for "anyone but a republican or a democrat" and have it work. Mind you, this kinda does depend on party elections, not person elections.
Re:If you thought this was cool, check out the ROP
on
Illusionary LED clock
·
· Score: 2
For even more fun, instead of a line of LCDs, you can have a 2d array. Spin this to get a 3d display.
Probably would make an even more hellacious racket.
HGTG defines the speed "R" as the fastest speed a sane person would want to travel, given an acceptable speed and not getting there more than, say, 5 minutes late.
I love those markers. And then they start talking about jitter and shelling out loads of money for a great transport (read CD-ROM player). I guess it all stems from a basic misunderstanding of the nature of bit-dom, and the fact that a one bit cannot be of better quality than another.
What about phase? How do you differentiate between a wave that is out of phase with the samples (in the extreme looking like a zero-amplitude wave) from a low aplitude in-phase wave.
ascii-art (ignore ".", used 'cause crappy slashdot doesn't have pre tag or nbsp:
|...---...............
|.//...\\.............
|/.......\...........
+----A--B-\----A--B--.
|..........\......./..
|...........\\...//...
|.............---.....
If I sample at A I get back the original waveform, but if I sample at B, I get back one of only half the amplitude, when I really wanted a full waveform that was phase shifted -pi/4.
I found it interesting that they had the balls to go to compaq and say "we've got a huge equation to solve. If you lend us some cycles, you can use us as a bragging point on how powerful the Alpha is."
Compaq was cool enough to take em up on it and lent them 13 days on a quad machine. That's alot of CPU that compaq donated for PR. mind you, I don't know if I think it necessarily qualifies as "normal", but still.
Maybe I should post this as a separate thread, but your post made me think about it, so here goes.
An old saying is that if you find a way to make an O(n^2) operation into an O(n lg n) one, the world will beat a path to your door finding ways to use it. It was originally said about FFT, which is used in any number of situations where you wouldn't expect it.
Anyways, I've been wondering about cellular simulations, like fluid dynamics or nuclear modelling.
How feasable would it be to make a special purpose SIMD chip that takes a simplish formula and applies it to each a large number of cells. The driving insight behind this proposition is that a cell has fairly predicable communication needs, so that you can hard wire efficient communications, and also that a n-way multicell (as would be expressed as a unit of silicon in my proposition) has comm needs that rise as n, but contains n^2 functional units. So the bigger you can make it, the cheaper communication becomes.
So this would be a very specialised peice of computing machinery. My question to you lot is how applicable the "beating a path to your door" would be. Can cellular computing be applied to much appart from the game of life?
The ever-sexy Connection Machine used bit serial processors. At least in the first generation, get-me-a-thesis version. Later versions that had to be applicable to more than fluid dynamics used commodity cpus, I believe.
Can anyone summarize why they went belly up? Too hard to program? What was their value-added, after they moved to Centinode commodity CPU systems. Doesn't everyone and their brother have huge systems? Or was CM special in that it had a good architecture for Shared memory busses (based on the hypercube, at least in mk 1)?
Re:Implications to Cryptography
on
Does P = NP?
·
· Score: 1
Slashdot Mirror
I had completely forgotten about that.
Reminds me of the std "blue sky" storage solutions where there is no distinction between cache/volative/persistent storage; each level is merely a faster cache for the next level down.
Has anyone made this work, on a performance basis, or is it inherently blue sky.
BTW, go ahead and mod up this parent (post #57).
Erm. I take that back. Further reading hints that while the modification is performed at mount time, it is apparently performed once only and modifies the underlying disk. It is unclear whether this is reversible.
Really. You entrust your mission critical data to ReiserFS? I must admit I didn't think it was mature enough for that.
How are the version updates to the fs code? Do you just recompile the kernel, or do you have to buy a new disk and copy the data from one format to the other?
I'm constantly stepping on the powerstrip and flicking main cutoff switch (don't ask -- small appartment) and killing my fileserver. Fsck of 25 gigs is no fun. It's getting to the point where I'm about to repartition and use apmd just to avoid rechecking all of it.
yet to have ext2 lose me any info, tho.
I thought it was very cool how Tux2 is implemented as a mount-time upgrade over ext2. This really increases my confidence in the system, as presumably it reuses all the low-level integrity routines.
Furthermore, should others report a bug before I suffer data loss, I can revert to plain old boring ext2 by just editing my fstab. Now that is a feature you don't get with other journaling fs (ext3? I'm not sure).
Has anyone produced a file system that was essentially a version control system
.snapshot directory and find the state of your files one, two, three, four hours ago, and one, two, or three days ago, or one week ago.
This is what net app has, I think.
Here at CCS, I believe our NFS needs are served by a net app server. Whatever it is serving them, it does automatic snapshots every hour, so that at any point you can access the
So not quite a version system, but mighty cool.
And really useful. It lets you dive in with exploratory programming (as long as you for the top-of-the-hour so the stable code is snapshotted), cause restoring your files is as easy as cp.
I agree it would be cooler if you could request a snapshot of this tree now please, but systems informs me that this is not possible/too much hassle.
Is it a TV sort of whine? Does it get better if you press at the side of the screen (not the glass itself, but the plastic frame around it).
My sharp laptop has this, tho the effect tends to go away after a few minute's use.
Do you really need to be able to type? Or would a keyboardless but w/ hard drive heavyweight PDA be what you want?
The picture book is almost what I'd want, but I think that if you could shave a couple of hours more into the battery life, and perhaps lose the keyboard for a touch screen at maybe 600x800 [sic] (instead of 1024x480) and also offer it for sub $1k, then my ears would really perk up. Before then, tho, the picture book is neither fish nor fowl.
Too big for every day use, too pricy for casual carrying around, too crappy battery life for extended use, and too small for real data entry.
I'd like to see what modern tech could do for the newton, which is not far from what I'm babbling about.
Since the government is the lender of last resort, the prime interest rate defines how much money they make from lending. Higher interest rates -> higher gvmt earnings.
How feasable would it be to completely remove taxes and only charge (higher, obviously) interest? This would remove alot of shoe-leather costs from the system, and also make avoiding taxes very hard (c.f. the recent revelations that microsoft et ali pay very little to none).
1) He does have a point, if poorly expressed
2) Invoking religion is cause for an almost immediate mark-down as a Troll (I notice that in the time it took me to load the page and press reply, this has already happened. But you knew it would).
3) Bashing religion is cause for an almost immediate mark-up as insightful.
so why bring up the subject at all if you know that its value to the discussion is marginal at best?
In sweden, I believe it is possible to vote blank. Choosing "e) none of the above" is a way of expressing dipleasure with the process.
It actually harms the other parties (you vote for party, not person) because of how seats in parliament are distributed per percentage of votes of all votes counted. Thus, voting for "e)" could be seen as voting for unspecified third party candidate (or 6'th or so in sweden, I forget how many big parties there are these days).
Anyway, I like the idea that you can basically vote for "anyone but a republican or a democrat" and have it work. Mind you, this kinda does depend on party elections, not person elections.
For even more fun, instead of a line of LCDs, you can have a 2d array. Spin this to get a 3d display.
Probably would make an even more hellacious racket.
acceptable risk I meant.
HGTG defines the speed "R" as the fastest speed a sane person would want to travel, given an acceptable speed and not getting there more than, say, 5 minutes late.
Arthur Dent thought that R17 was a bit too fast.
I love those markers. And then they start talking about jitter and shelling out loads of money for a great transport (read CD-ROM player). I guess it all stems from a basic misunderstanding of the nature of bit-dom, and the fact that a one bit cannot be of better quality than another.
What about phase? How do you differentiate between a wave that is out of phase with the samples (in the extreme looking like a zero-amplitude wave) from a low aplitude in-phase wave.
...........
ascii-art (ignore ".", used 'cause crappy slashdot doesn't have pre tag or nbsp:
|...---...............
|.//...\\.............
|/.......\
+----A--B-\----A--B--.
|..........\......./..
|...........\\...//...
|.............---.....
If I sample at A I get back the original waveform, but if I sample at B, I get back one of only half the amplitude, when I really wanted a full waveform that was phase shifted -pi/4.
2GB restriction? I dan't recall running into that.
Besides an unfortunate name, I never understood why wankel engines didn't catch on. Few moving parts, simple design... beautiful.
Ideas?
The onion had an article a long time ago about their advanced encraption technologies. Apparently really useful for pee-commerce.
yup. I grabbed the carrying case by one handle, knowing it was shut, and was rewarded by seeing my laptop do a triple rebound plummet down the stairs.
The impact did dent a corner of the laptop, but also woke up a hitherto sleeping pixel.
Taiwaneese no-name laptops may have crap battery, no power management, and weigh several tonnes, but they do build 'em solid. Ran pretty fast too.
I found it interesting that they had the balls to go to compaq and say "we've got a huge equation to solve. If you lend us some cycles, you can use us as a bragging point on how powerful the Alpha is."
Compaq was cool enough to take em up on it and lent them 13 days on a quad machine. That's alot of CPU that compaq donated for PR. mind you, I don't know if I think it necessarily qualifies as "normal", but still.
Maybe I should post this as a separate thread, but your post made me think about it, so here goes.
An old saying is that if you find a way to make an O(n^2) operation into an O(n lg n) one, the world will beat a path to your door finding ways to use it. It was originally said about FFT, which is used in any number of situations where you wouldn't expect it.
Anyways, I've been wondering about cellular simulations, like fluid dynamics or nuclear modelling.
How feasable would it be to make a special purpose SIMD chip that takes a simplish formula and applies it to each a large number of cells. The driving insight behind this proposition is that a cell has fairly predicable communication needs, so that you can hard wire efficient communications, and also that a n-way multicell (as would be expressed as a unit of silicon in my proposition) has comm needs that rise as n, but contains n^2 functional units. So the bigger you can make it, the cheaper communication becomes.
So this would be a very specialised peice of computing machinery. My question to you lot is how applicable the "beating a path to your door" would be. Can cellular computing be applied to much appart from the game of life?
The ever-sexy Connection Machine used bit serial processors. At least in the first generation, get-me-a-thesis version. Later versions that had to be applicable to more than fluid dynamics used commodity cpus, I believe.
Can anyone summarize why they went belly up? Too hard to program? What was their value-added, after they moved to Centinode commodity CPU systems. Doesn't everyone and their brother have huge systems? Or was CM special in that it had a good architecture for Shared memory busses (based on the hypercube, at least in mk 1)?
well, there we go. Thanks for the tip.
Will Taco flame me on IRC for this? Damn, I hope so!
To this day, I cannot understand why the powers that be feel that it is beneath them to participate in the discussion threads.
I just don't get it. Oh well, another item for the list.
heh. In unary representation, I believe composite is P. The trick is that the input is exponentially long...