vincenz
Mar 13, 12:35 PM
Best wishes to the Japanese people. Hope they can get over this tragedy soon.
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gnasher729
Apr 9, 02:47 AM
You summed it up beautifully. You're not a gamer. You're what is called a time passer, which are what 99 percent of IOS games are, mind numbing time killers.
So what exactly is the difference between a "gamer" and a "time passer"?
So what exactly is the difference between a "gamer" and a "time passer"?
appleguy123
Mar 24, 07:40 PM
That doesn't take away from how utterly hypocritical that train of thought is.
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Pressure sores are caused
days) but pressure ulcers
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okboy
Apr 8, 11:21 PM
Not really impressed by the whole push into gaming-- gaming is what I use my iPT and iPad for the least. In fact, Game Center is in a folder marked "Undeletable Crap" on both devices, along with address book, FaceTime, calendar, and stocks (on the iPT). Really wish Apple allowed you to delete whatever you wanted-- but of course they know what I want better than I do.
Oh boo hoo, someone get this guy a tissue. How can it bother you that there is some game executive somewhere inside Apple HQ?
Oh boo hoo, someone get this guy a tissue. How can it bother you that there is some game executive somewhere inside Apple HQ?
vniow
Oct 9, 12:57 AM
Originally posted by Abercrombieboy
I don't understand you guys, you say that Windows XP is now stable and maybe you are right, and you say that PC's are faster and the hardware is the same quality for less money.
The dressing is coated with
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listed) Pressure ulcers
Pressure sores are preventable. Hospital staff need to focus on patients factors and take necessary steps to assure patients remain free from pressure sores
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listed) Pressure ulcers
pressure ulcers and simple
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Pressure sores
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Stages of Pressure Sores
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For use as a wound dressing to
pressure sores is .
including: Pressure Ulcers
The dressing fabric is also
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heel pressure sores are
for Pressure Sores at
2.0 cm heel pressure ulcer
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I don't understand you guys, you say that Windows XP is now stable and maybe you are right, and you say that PC's are faster and the hardware is the same quality for less money.
samcraig
Mar 18, 08:32 AM
I'm not a thief, I use my data responsible.
Its appalling that your so righteous to post such.
I have an unlimited plan, $30 a month, I use tether for a few things but do not go over 5gb a month, I have unlimited so it shouldn't matter, but I use much less then the one poster who claims 90gb a month to download movies.
Yes I think thats abuse.
I think anything over 10 to 20gb would be pure abuse.
but occasional tethering and under that 10gb abuse? No way.
I need to calm down because it bothers me that people are so brainwashed these days to accept what ever a company does.
It's just crap. No matter what a Contract says it can be challenged in court and we could be right and At&t wrong.
So you're saying that if you steal $10 vs $1 million - it's not stealing? No doubt different levels of crime - but both are illegal.
But see my post above. The long/short of it is - unlimited data is specific to the device as per the TOS. If you're breaking the TOS, you're breaking the TOS - no matter how you or anyone tries to justify it - and ATT can "retaliate" as it's within their right as per that TOS.
I do not support ATT doing anything to those who already have a metered (limited) data plan. THAT makes no sense.
Its appalling that your so righteous to post such.
I have an unlimited plan, $30 a month, I use tether for a few things but do not go over 5gb a month, I have unlimited so it shouldn't matter, but I use much less then the one poster who claims 90gb a month to download movies.
Yes I think thats abuse.
I think anything over 10 to 20gb would be pure abuse.
but occasional tethering and under that 10gb abuse? No way.
I need to calm down because it bothers me that people are so brainwashed these days to accept what ever a company does.
It's just crap. No matter what a Contract says it can be challenged in court and we could be right and At&t wrong.
So you're saying that if you steal $10 vs $1 million - it's not stealing? No doubt different levels of crime - but both are illegal.
But see my post above. The long/short of it is - unlimited data is specific to the device as per the TOS. If you're breaking the TOS, you're breaking the TOS - no matter how you or anyone tries to justify it - and ATT can "retaliate" as it's within their right as per that TOS.
I do not support ATT doing anything to those who already have a metered (limited) data plan. THAT makes no sense.
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alhedges
Mar 18, 02:55 PM
If this fails, and you have money to blow to prove a point, you can probably seek an injunction preventing AT&T from altering your contract, or a declaratory judgment that the contract permits you to get out of it without an ETF in this circumstance.
Odds are that AT&T would be unlikely to show up for any lawsuit filed by an individual over a few hundred bucks, which would entitle you to both the ETF and your legal fees.
Granted, I'm a student not yet a practitioner, so all of this should be taken with several grains of salt. Additionally, none of this should be construed to constitute legal advice.
There's a binding arbitration clause in the TOS.
Odds are that AT&T would be unlikely to show up for any lawsuit filed by an individual over a few hundred bucks, which would entitle you to both the ETF and your legal fees.
Granted, I'm a student not yet a practitioner, so all of this should be taken with several grains of salt. Additionally, none of this should be construed to constitute legal advice.
There's a binding arbitration clause in the TOS.
Bill McEnaney
Mar 26, 12:41 PM
I agree with you, brother. God bless you.
Is est a subcribo of contradictio frater
Is est a subcribo of contradictio frater
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neiltc13
Apr 9, 07:03 PM
I can't see how Apple making a Bluetooth controller, which, say looked a bit like a PS3/360 controller, and selling it as an optional accessory could be in any way a negative thing.
No-one would be forced to buy it, and no devs would be forced to support it.
Apple could insist every game have on screen controls for people who wanted to only use the touch screen for gaming.
But apps could support the external controller also.
This could only be win win for Apple and users.
It's adding additional functionality and adding the possibility for more advanced games to be developed for the device in the future, esp as the speed will only get better as new iPad's come out.
Not doing so, almost feels like they wish to cripple the device forever.
Why would anyone say they would not want Apple to give users and devs the "Option" of something like this? Not force people to use it, but sell it as an "Option"
If they do this then the iPad had a chance of becoming a genuine serious gaming device in the home in the long term. If they insist forever to only support touch screen, then the iPad will always remain that thing which plays cheap and simple games.
You raise an interesting point, but would holding an iPad with a gamepad around it really be that comfortable?
I can think of two reasons why it wouldn't be:
Device weight and the distance at which you'd have to hold it for it to be usable. iPad is 601g - holding that at arm's length or thereabouts while trying to concentrate on a game could be quite difficult, especially for younger users. It's almost three times the weight of a Nintendo DSi.
No-one would be forced to buy it, and no devs would be forced to support it.
Apple could insist every game have on screen controls for people who wanted to only use the touch screen for gaming.
But apps could support the external controller also.
This could only be win win for Apple and users.
It's adding additional functionality and adding the possibility for more advanced games to be developed for the device in the future, esp as the speed will only get better as new iPad's come out.
Not doing so, almost feels like they wish to cripple the device forever.
Why would anyone say they would not want Apple to give users and devs the "Option" of something like this? Not force people to use it, but sell it as an "Option"
If they do this then the iPad had a chance of becoming a genuine serious gaming device in the home in the long term. If they insist forever to only support touch screen, then the iPad will always remain that thing which plays cheap and simple games.
You raise an interesting point, but would holding an iPad with a gamepad around it really be that comfortable?
I can think of two reasons why it wouldn't be:
Device weight and the distance at which you'd have to hold it for it to be usable. iPad is 601g - holding that at arm's length or thereabouts while trying to concentrate on a game could be quite difficult, especially for younger users. It's almost three times the weight of a Nintendo DSi.
joepunk
Mar 13, 09:45 PM
There has been another quake, possible 6.2
0134: The tremor struck off-shore 140km (87 miles) north-east of Tokyo, shaking tall buildings in the capital but the authorities did not issue a tsunami alert, AFP reports. It had a depth of 18.8km, the US Geological Survey says.
And sea level has dropped five metres off Fukushima. Possibility of another Tsunami. There were two explosions (hydrogen explosion) at Reactor 3, the operator Tepco says - AFP. Reactor 3 withstood the explosion(s), its operator says.
Probably no tsunami though.
via BBC Twitter feed.
0134: The tremor struck off-shore 140km (87 miles) north-east of Tokyo, shaking tall buildings in the capital but the authorities did not issue a tsunami alert, AFP reports. It had a depth of 18.8km, the US Geological Survey says.
And sea level has dropped five metres off Fukushima. Possibility of another Tsunami. There were two explosions (hydrogen explosion) at Reactor 3, the operator Tepco says - AFP. Reactor 3 withstood the explosion(s), its operator says.
Probably no tsunami though.
via BBC Twitter feed.
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Rt&Dzine
Mar 24, 07:06 PM
"When they express their moral beliefs or beliefs about human nature ... they are stigmatised, and worse -- they are vilified, and prosecuted.
"These attacks are violations of fundamental human rights and cannot be justified under any circumstances," Tomasi said.
As soon as they quit trying to legislate and force their beliefs on the rest of us, the sooner they will be left alone to wallow in their archaic beliefs.
"These attacks are violations of fundamental human rights and cannot be justified under any circumstances," Tomasi said.
As soon as they quit trying to legislate and force their beliefs on the rest of us, the sooner they will be left alone to wallow in their archaic beliefs.
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bobsentell
Mar 18, 08:45 AM
I see nothing wrong with AT&T cracking down. You signed a contract that specifically said you had no interest in tethering. But if you use it, then you lied when you signed your contract which means AT&T has the right to modify it.
Hey, it's better then them blackballing you and making you pay the remainder of your phone's cost.
Hey, it's better then them blackballing you and making you pay the remainder of your phone's cost.
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Dr.Gargoyle
Sep 20, 09:47 AM
Since iTV most likely wont be a DVR device, I coughed up $700 today for a Sony DVR instead.
I am sure Apple has a brilliant plan for the iTV, but I fail to see it.
I am sure Apple has a brilliant plan for the iTV, but I fail to see it.
lifeinhd
Apr 8, 11:18 PM
Wirelessly posted (Mozilla/5.0 (iPod; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)
Not really impressed by the whole push into gaming-- gaming is what I use my iPT and iPad for the least. In fact, Game Center is in a folder marked "Undeletable Crap" on both devices, along with address book, FaceTime, calendar, and stocks (on the iPT). Really wish Apple allowed you to delete whatever you wanted-- but of course they know what I want better than I do.
Not really impressed by the whole push into gaming-- gaming is what I use my iPT and iPad for the least. In fact, Game Center is in a folder marked "Undeletable Crap" on both devices, along with address book, FaceTime, calendar, and stocks (on the iPT). Really wish Apple allowed you to delete whatever you wanted-- but of course they know what I want better than I do.
javajedi
Oct 8, 04:49 PM
Originally posted by WanaPBnow
Sadly the lack of a system bus faster than 133/167 and use of leading edge RAM technology is a major downside to Mac hardware. G4 with software optomized for it is still on par with P4, but when Altivec is not in the picture or MultiProcessor awareness, the Mac slips very fart behind. I still have faith that the G5 will make up for this gap.
As for OS X vs Windows 2000, I am not as technically aware as the above poster, however my own experience in a large office environment with heavy networking is that Windows 2000 has failed us. We are switching to Unix and Sun, because we can't afford the down time that windows 2000 is giving us, the cost advantage of windows not withstanding.
I have not come accross many large computer operations people that will tell me that Windows is a replacement for Unix. Not unless dealing with small size and limited budget.
To clarify, I was referring to Windows XP and Mac OS X on the desktop, not server. I have had excellent experiences with both in terms of stability. As far as the Windows platform on the server side, again, the magic is in the software. I work for a modest sized isp, and we recently transitioned all of our production servers to bsd and linux blades. All of our web/dns/mx/mail/mrtg/etc machines are Unix. The result has been they are more reliable, and easier to maintain, not to mention the substantial less total cost of ownership.
Sadly the lack of a system bus faster than 133/167 and use of leading edge RAM technology is a major downside to Mac hardware. G4 with software optomized for it is still on par with P4, but when Altivec is not in the picture or MultiProcessor awareness, the Mac slips very fart behind. I still have faith that the G5 will make up for this gap.
As for OS X vs Windows 2000, I am not as technically aware as the above poster, however my own experience in a large office environment with heavy networking is that Windows 2000 has failed us. We are switching to Unix and Sun, because we can't afford the down time that windows 2000 is giving us, the cost advantage of windows not withstanding.
I have not come accross many large computer operations people that will tell me that Windows is a replacement for Unix. Not unless dealing with small size and limited budget.
To clarify, I was referring to Windows XP and Mac OS X on the desktop, not server. I have had excellent experiences with both in terms of stability. As far as the Windows platform on the server side, again, the magic is in the software. I work for a modest sized isp, and we recently transitioned all of our production servers to bsd and linux blades. All of our web/dns/mx/mail/mrtg/etc machines are Unix. The result has been they are more reliable, and easier to maintain, not to mention the substantial less total cost of ownership.
EricNau
Mar 15, 01:53 AM
Seems very serious to me:
http://www.nytimes.com/2011/03/15/world/asia/15nuclear.html?pagewanted=1&_r=1&hp
It depends on who you want to believe. The situation is serious, yes, but is that quote truly representative of the situation? Professor Josef Oehmen, MIT:
There was and will not be any significant release of radioactivity. By 'significant,' I mean a level of radiation of more than what you would receive on, say, a long distance flight, or drinking a glass of beer that comes from certain areas with high levels of natural background radiation.
Link (http://mitnse.com/2011/03/13/why-i-am-not-worried-about-japans-nuclear-reactors/)
http://www.nytimes.com/2011/03/15/world/asia/15nuclear.html?pagewanted=1&_r=1&hp
It depends on who you want to believe. The situation is serious, yes, but is that quote truly representative of the situation? Professor Josef Oehmen, MIT:
There was and will not be any significant release of radioactivity. By 'significant,' I mean a level of radiation of more than what you would receive on, say, a long distance flight, or drinking a glass of beer that comes from certain areas with high levels of natural background radiation.
Link (http://mitnse.com/2011/03/13/why-i-am-not-worried-about-japans-nuclear-reactors/)
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jellybean
Apr 24, 08:06 PM
And an almost fanatical devotion to the Pope...
I didn't expect some sort of Spanish inquisition :eek:
I didn't expect some sort of Spanish inquisition :eek:
odedia
Sep 20, 06:11 AM
For 300$, it'll only have a tiny hard drive for caching large h.264 videos on the iTV itself instead of continuesly streaming it over the Wi-Fi.
I am pretty darn sure that iTV will be able to play ANY quicktime video. Meaning - in order to playback other formats, like DivX, just download the quicktime Codec.
I am pretty darn sure that iTV will be able to play ANY quicktime video. Meaning - in order to playback other formats, like DivX, just download the quicktime Codec.
Ugg
Mar 13, 12:21 PM
What is the alternative to nuclear power? These green ways of producing electricity cost a lot more and what I've heard, they can't provide enough power. Plus they don't work everywhere (not enough sun or wind in here for example).
Whether it's a good move to build nuclear plants near tectonic plate joints, that's another question. We don't have seismic activity in here so such natural catastrophes aren't a concern.
Of course you would say that, Finland gets ~30% of its energy from nuclear. Olkiluoto isn't exactly coming in under budget, is it?
It's not just a matter whether it is safe in your country, it's also a matter of whether it's safe for your neighbors. If I remember correctly, y'all had to throw away a lot of caribou meat after Chernobyl.
Whether it's a good move to build nuclear plants near tectonic plate joints, that's another question. We don't have seismic activity in here so such natural catastrophes aren't a concern.
Of course you would say that, Finland gets ~30% of its energy from nuclear. Olkiluoto isn't exactly coming in under budget, is it?
It's not just a matter whether it is safe in your country, it's also a matter of whether it's safe for your neighbors. If I remember correctly, y'all had to throw away a lot of caribou meat after Chernobyl.
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Rodimus Prime
Mar 14, 12:21 AM
The small ones, like satellites dishes. You can buy them at Jaycar.
http://www.jaycar.com.au/productResults.asp?whichpage=3&pagesize=10&keywords=wind&form=KEYWORD
Pretty much like a weather vein or TV aerial. Provides a couple of hundred watts at 24V or 12V. I was thinking about one for if there is ever a blackout (ie a drunk hitting a power pole, it's happened) instead of needing a petrol generator.
Every home generating 500W of their own wind power with one of these little things on their roof in a city of Los Angeles with a million homes = 500,000,000 watts. As well as a solar panel at 500W too is up to a billion watts not required from any central power source.
idea time only. Wind produces the most power during the night (not during peak load times) and again I would not want the noise from the wind turbines all over hte place.
http://www.jaycar.com.au/productResults.asp?whichpage=3&pagesize=10&keywords=wind&form=KEYWORD
Pretty much like a weather vein or TV aerial. Provides a couple of hundred watts at 24V or 12V. I was thinking about one for if there is ever a blackout (ie a drunk hitting a power pole, it's happened) instead of needing a petrol generator.
Every home generating 500W of their own wind power with one of these little things on their roof in a city of Los Angeles with a million homes = 500,000,000 watts. As well as a solar panel at 500W too is up to a billion watts not required from any central power source.
idea time only. Wind produces the most power during the night (not during peak load times) and again I would not want the noise from the wind turbines all over hte place.
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alex_ant
Oct 9, 08:08 PM
Originally posted by gopher
Maybe we have, but nobody has provided compelling evidence to the contrary.
You must be joking. Reference after reference has been provided and you simply break from the thread, only to re-emerge in another thread later. This has happened at least twice now that I can remember.
The Mac hardware is capable of 18 billion floating calculations a second. Whether the software takes advantage of it that's another issue entirely.
My arse is capable of making 8-pound turds, but whether or not I eat enough baked beans to take advantage of that is another issue entirely. In other words,
18 gigaflops = about as likely as an 8-pound turd in my toilet. Possible, yes (under the most severely ridiculous condtions). Real-world, no.
If someone is going to argue that Macs don't have good floating point performance, just look at the specs.
For the - what is this, fifth? - time now: AltiVec is incapable of double precision, and is capable of accelerating only that code which is written specifically to take advantage of it. Which is some of it. Which means any high "gigaflops" performance quotes deserve large asterisks next to them.
If they really want good performance and aren't getting it they need to contact their favorite developer to work with the specs and Apple's developer relations.
Exactly, this is the whole problem - if a developer wants good performance and can't get it, they have to jump through hoops and waste time and money that they shouldn't have to waste.
Apple provides the hardware, it is up to developer companies to utilize the hardware the best way they can. If they can't utilize Apple's hardware to its most efficient mode, then they should find better developers.
Way to encourage Mac development, huh? "Hey guys, come develop for our platform! We've got a 3.5% national desktop market share and a 2% world desktop market share, and we have an uncertain future! We want YOU to spend time and money porting your software to OUR platform, and on top of that, we want YOU to go the extra mile to waste time and money that you shouldn't have to waste just to ensure that your code doesn't run like a dog on our ancient wack-job hack of a processor!"
If you are going to complain that Apple doesn't have good floating point performance, don't use a PC biased spec like Specfp.
"PC biased spec like SPECfp?" Yes, the reason PPC does so poorly in SPEC is because SPECfp is biased towards Intel, AMD, Sun, MIPS, HP/Compaq, and IBM (all of whose chips blow the G4 out of the water, and not only the x86 chips - the workstation and server chips too, literally ALL of them), and Apple's miserable performance is a conspiracy engineered by The Man, right?
Go by actual floating point calculations a second.
Why? FLOPS is as dumb a benchmark as MIPS. That's the reason cross-platform benchmarks exist.
Nobody has shown anything to say that PCs can do more floating point calculations a second. And until someone does I stand by my claim.
An Athlon 1700+ scores about what, 575 in SPECfp2000 (depending on the system)? Results for the 1.25GHz G4 are unavailable (because Apple is ashamed to publish them), but the 1GHz does about 175. Let's be very gracious and assume the new GCC has got the 1.25GHz G4 up to 300. That's STILL terrible. So how about an accurate summary of the G4's floating point performance:
On the whole, poor.******
* Very strong on applications well-suited to AltiVec and optimized to take advantage of it.
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Maybe we have, but nobody has provided compelling evidence to the contrary.
You must be joking. Reference after reference has been provided and you simply break from the thread, only to re-emerge in another thread later. This has happened at least twice now that I can remember.
The Mac hardware is capable of 18 billion floating calculations a second. Whether the software takes advantage of it that's another issue entirely.
My arse is capable of making 8-pound turds, but whether or not I eat enough baked beans to take advantage of that is another issue entirely. In other words,
18 gigaflops = about as likely as an 8-pound turd in my toilet. Possible, yes (under the most severely ridiculous condtions). Real-world, no.
If someone is going to argue that Macs don't have good floating point performance, just look at the specs.
For the - what is this, fifth? - time now: AltiVec is incapable of double precision, and is capable of accelerating only that code which is written specifically to take advantage of it. Which is some of it. Which means any high "gigaflops" performance quotes deserve large asterisks next to them.
If they really want good performance and aren't getting it they need to contact their favorite developer to work with the specs and Apple's developer relations.
Exactly, this is the whole problem - if a developer wants good performance and can't get it, they have to jump through hoops and waste time and money that they shouldn't have to waste.
Apple provides the hardware, it is up to developer companies to utilize the hardware the best way they can. If they can't utilize Apple's hardware to its most efficient mode, then they should find better developers.
Way to encourage Mac development, huh? "Hey guys, come develop for our platform! We've got a 3.5% national desktop market share and a 2% world desktop market share, and we have an uncertain future! We want YOU to spend time and money porting your software to OUR platform, and on top of that, we want YOU to go the extra mile to waste time and money that you shouldn't have to waste just to ensure that your code doesn't run like a dog on our ancient wack-job hack of a processor!"
If you are going to complain that Apple doesn't have good floating point performance, don't use a PC biased spec like Specfp.
"PC biased spec like SPECfp?" Yes, the reason PPC does so poorly in SPEC is because SPECfp is biased towards Intel, AMD, Sun, MIPS, HP/Compaq, and IBM (all of whose chips blow the G4 out of the water, and not only the x86 chips - the workstation and server chips too, literally ALL of them), and Apple's miserable performance is a conspiracy engineered by The Man, right?
Go by actual floating point calculations a second.
Why? FLOPS is as dumb a benchmark as MIPS. That's the reason cross-platform benchmarks exist.
Nobody has shown anything to say that PCs can do more floating point calculations a second. And until someone does I stand by my claim.
An Athlon 1700+ scores about what, 575 in SPECfp2000 (depending on the system)? Results for the 1.25GHz G4 are unavailable (because Apple is ashamed to publish them), but the 1GHz does about 175. Let's be very gracious and assume the new GCC has got the 1.25GHz G4 up to 300. That's STILL terrible. So how about an accurate summary of the G4's floating point performance:
On the whole, poor.******
* Very strong on applications well-suited to AltiVec and optimized to take advantage of it.
Howdr
Mar 18, 01:14 PM
It's not deceptive. It's just that people don't read it until they want to prove/disprove something.
People are more concerned with shortening their wait time/shopping experience online or in the store to get their hands on their devices more so than reading the terms and usage regarding those devices.
But that's not deceptive. You're confusing deceptive with laziness
No in the TOS it states there is a limit to unlimited (5gb), deceptive.
As far as the tethering issue, at&t does not know whos tethering.
they are guessing............so yes its wrong for them they should have proof and its possible for them to have the proof but they are the lazy ones.
"I think you are guilty, but to have the proof takes too much time, just execute them"
We live in a time of reason ( I question this at times myself) and you cannot condemn people based on a belief you need the proof.
People are more concerned with shortening their wait time/shopping experience online or in the store to get their hands on their devices more so than reading the terms and usage regarding those devices.
But that's not deceptive. You're confusing deceptive with laziness
No in the TOS it states there is a limit to unlimited (5gb), deceptive.
As far as the tethering issue, at&t does not know whos tethering.
they are guessing............so yes its wrong for them they should have proof and its possible for them to have the proof but they are the lazy ones.
"I think you are guilty, but to have the proof takes too much time, just execute them"
We live in a time of reason ( I question this at times myself) and you cannot condemn people based on a belief you need the proof.
Liquorpuki
Mar 13, 08:11 PM
did you actually read my post? Centralized solar would just be one part.
Yeah I did. Everything you mentioned except tidal is intermittent, cannot be used for base load, and is subject to the grid energy storage problem that I mentioned and you said an 8 hour "battery" will solve (which it won't). Tidal can be used for base load but has a crappy generating capacity, no way could it cover the base load for the entire US.
So basically your plan would cause a lot of blackouts and upset a lot of people.
Yeah I did. Everything you mentioned except tidal is intermittent, cannot be used for base load, and is subject to the grid energy storage problem that I mentioned and you said an 8 hour "battery" will solve (which it won't). Tidal can be used for base load but has a crappy generating capacity, no way could it cover the base load for the entire US.
So basically your plan would cause a lot of blackouts and upset a lot of people.
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ddtlm
Oct 12, 03:30 PM
Wow I missed a lot by spending all of Friday away from this board. I am way behind in posts here, and I'm sure I'll miss a lot of things worth comment. But anyway, the code fragment:
int x1,x2,x3;
for (x1=1; x1<=20000; x1++) {
for(x2=1; x2<=20000; x2++) {
x3 = x1*x2;
}
}
Is a very poor benchmark. Compilers may be able to really dig into that and make the resulting executable perform the calculate radically different. In fact, I can tell you the answer outright: x1=20000, x2=20000, x3 = 400000000. It took me 2 seconds or so. Does this mean that I am a better computer than a G4 and a P4? No, it means I realized that the loop can be reduced to simple data assignments. I have a better compiler, thats it.
Anyway, lets pretend that for whatever reason compilers did not simplify that loop AT ALL. Note that this would be a stupid stupid compiler. At each stage, x1 is something, we ++x2, and we set x3 = x1 * x2. Now notice that we cannot set x3 until the result of X2++ is known. On a pipelined processor that cannot execute instructions out of order, this means that I have a big "bubble" in the pipeline as I wait for the new x2 before I can multiply. However, after the x3 is started into the pipe, the next instruction is just another x2++ which does not depend on x3, so I can do it immediately. On a 7-stage in-order chip like a G4, this means that I fill two stages of the pipe and then have to wait for the results on the other end before I can continue. You see that this is very inefficient (28% or so). However, the G3 is a 4-stage design and so 2/4 of the stages can stay busy, resulting in a 50% efficientcy (so a 700mhz G3 is "the same as" a 350mhz G3 at 100% and a 800mhz G4 is "the same as" a 210mhz G4 at 100%). These are of course simplified cases, the actual result may very a bit for some obscure reason.
Actually the above stuff is inaccurate. The G3 sports 2 integer units AFAIK, so it can do x3 = x1*x2 at the same time as it is doing x2++ (for the next loop of course, not this one). This means that both pipes start one bit of work, then wait for it to get out the other end, then do one bit of work again. So this is 25% efficientcy. A hypothetical single-pipe G3 would do x3 = x1*x3 and then do x2++, however it could not do x3 = x1 * x2 again until the x2++ was out the other end, which takes 4 cycles and started one after the previos x3 = x1*x2, which should mean 3 "bubble" stages and an efficientcy of 20%.
Actually, it may be worse than that. Remember that this is in a loop. The loop means a compare instruction (are we done yet?) followed by a jump depending on the results of the compare. We therefore have 4 instructions in PPC I think per loop, and we can't compare x2 to 20000 until x2++ has gone through all the pipe stages. (Oh no!) And we can't jump until we know r]the result of the compare (oh no!). Seeing the pattern? Wanna guess what the efficientcy is for a really stupid compiled version of this "benchmark"? A: really freaking low.
I'll see about adding more thoughts later.
int x1,x2,x3;
for (x1=1; x1<=20000; x1++) {
for(x2=1; x2<=20000; x2++) {
x3 = x1*x2;
}
}
Is a very poor benchmark. Compilers may be able to really dig into that and make the resulting executable perform the calculate radically different. In fact, I can tell you the answer outright: x1=20000, x2=20000, x3 = 400000000. It took me 2 seconds or so. Does this mean that I am a better computer than a G4 and a P4? No, it means I realized that the loop can be reduced to simple data assignments. I have a better compiler, thats it.
Anyway, lets pretend that for whatever reason compilers did not simplify that loop AT ALL. Note that this would be a stupid stupid compiler. At each stage, x1 is something, we ++x2, and we set x3 = x1 * x2. Now notice that we cannot set x3 until the result of X2++ is known. On a pipelined processor that cannot execute instructions out of order, this means that I have a big "bubble" in the pipeline as I wait for the new x2 before I can multiply. However, after the x3 is started into the pipe, the next instruction is just another x2++ which does not depend on x3, so I can do it immediately. On a 7-stage in-order chip like a G4, this means that I fill two stages of the pipe and then have to wait for the results on the other end before I can continue. You see that this is very inefficient (28% or so). However, the G3 is a 4-stage design and so 2/4 of the stages can stay busy, resulting in a 50% efficientcy (so a 700mhz G3 is "the same as" a 350mhz G3 at 100% and a 800mhz G4 is "the same as" a 210mhz G4 at 100%). These are of course simplified cases, the actual result may very a bit for some obscure reason.
Actually the above stuff is inaccurate. The G3 sports 2 integer units AFAIK, so it can do x3 = x1*x2 at the same time as it is doing x2++ (for the next loop of course, not this one). This means that both pipes start one bit of work, then wait for it to get out the other end, then do one bit of work again. So this is 25% efficientcy. A hypothetical single-pipe G3 would do x3 = x1*x3 and then do x2++, however it could not do x3 = x1 * x2 again until the x2++ was out the other end, which takes 4 cycles and started one after the previos x3 = x1*x2, which should mean 3 "bubble" stages and an efficientcy of 20%.
Actually, it may be worse than that. Remember that this is in a loop. The loop means a compare instruction (are we done yet?) followed by a jump depending on the results of the compare. We therefore have 4 instructions in PPC I think per loop, and we can't compare x2 to 20000 until x2++ has gone through all the pipe stages. (Oh no!) And we can't jump until we know r]the result of the compare (oh no!). Seeing the pattern? Wanna guess what the efficientcy is for a really stupid compiled version of this "benchmark"? A: really freaking low.
I'll see about adding more thoughts later.
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