clock

I understand the need for vector clocks in terms of scalar logical clocks failing to provide enough information to tell whether there is an update conflict in a key value store update for example. But I am not sure what problem is still unsolved by vector clocks and then solved by the more bulky matrix clocks? In an eventual consistency environment all messages ever created by a system need to be kept until every peer has received the message (== eventual consistency). But you don't want to keep messages for ever, so you need to have a way to tell which messages were received by all nodes and

I'm drawing a non-traditional ring-clock in canvas. The time is represented by a second ring, second hand, minute ring, and hour ring. I am using webkit/mozRequestAnimationFrame to draw at the appropriate time. I would like to modify the second ring to animate to the next second quickly (125ms - 250ms) and with Quadratic easing (instead of that dreaded snap). Much like the Raphael JS Clock animates its second ring, except it uses different easing: http://raphaeljs.com/polar-clock.html JS Fiddle Links (must view in Chrome, Firefox, or Webkit Nightly): Fiddle: http://jsfiddle.net/thecrypticace

I want to show the current time(MM/DD/YY hh:mm:ss) in react native app like a clock, and get update every seconds, I tried using new Date() and set it in state, but the time don't update unless I refresh the page. I also tried using setInterval function in render(), it do got update but it's expensive for CPU. is there a good method to realise the function? state = { curTime: null, } render(){ setInterval(function(){this.setState({curTime: new Date().toLocaleString()});}.bind(this), 1000); return ( <View> <Text style={headerStyle.marginBottom15}>Date: {this.state.curTime}</Text> </View> ); }

Why doesn't the Android emulator's clock match the host system clock? It's not a time zone difference --it's always off by several minutes. Is there a way to synchronize them besides manually setting the emulator's time? Raykud I believe there is no way to synchronize the time. The default image of the emulator sets to UTC/GMT (+00:00). However you can change it to your own. Here is an image on how to do so: First un-check the "Automatic Time Zone" (red arrow) then click on the "Selected Time Zone" (green arrow) and finally select your time zone and it should match the one on your system

I am uploading my OpenCL and Cuda code to hgpu.org because I don't have a graphics card on my laptop. When I upload my code I get the following error: make: Warning: File `main.cu' has modification time 381 s in the future make: warning: Clock skew detected. Your build may be incomplete. I know that clock skew is due to difference in my machines clock time and the server's clock time, so I synchronized my time with the server's. The OpenCL and C++ code is running fine now but the Cuda code is still giving me this error. So my question is: Is there any other reason for clock skew error besides

Listen carefully, because this is specific. I'm trying to make an analog clock in iPhone SDK. I've been trying to accomplish this for three weeks now, I've asked five questions on SO, and I still have found almost NOTHING. I need help. I want to have a clock hand that simply rotates depending on the current time. I'm mostly focused on the second hand right now because it seems like the easiest. I don't necessarily care what is used to rotate the clock hand (CALayers, UIView, etc.), just as long as it does what it needs to do. Any sort of help is greatly, greatly appreciated. Thanks. EDIT: I

I just bought a nifty MBA 13" Core i7. I'm told the CPU speed varies automatically, and pretty wildly, too. I'd really like to be able to monitor this with a simple app. Are there any Cocoa or C calls to find the current clock speed, without actually affecting it? Edit: I'm OK with answers using Terminal calls, as well as programmatic. Thanks! Yevgeni Try this tool called "Intel Power Gadget". It displays IA frequency and IA power in real time. http://software.intel.com/sites/default/files/article/184535/intel-power-gadget-2.zip You can query the CPU speed easily via sysctl , either by command