cpu

What is the best way to find the cause of high cpu usage of javascript? I have a script that simply loads photos from flickr in a thumbnail gallery. After they're loaded, nothing is being done (waiting for you to click them to display in a lightbox), but the cpu usage is still 25% or more. I've opened firebug, clicked profile, waited a bit then clicked it again, but it says "No activity to report". If there was something going on, wouldn't it report? Or am I using this tool wrong? I am doing this after everything is loaded, just to see what might be causing that high cpu usage. Thanks, Wesley

I have performance critical code written for multiple CPUs. I detect CPU at run-time and based on that I use appropriate function for the detected CPU. So, now I have to use function pointers and call functions using these function pointers: void do_something_neon(void); void do_something_armv6(void); void (*do_something)(void); if(cpu == NEON) { do_something = do_something_neon; }else{ do_something = do_something_armv6; } //Use function pointer: do_something(); ... Not that it matters, but I'll mention that I have optimized functions for different cpu's: armv6 and armv7 with NEON support. The

I created test with JMeter to test performance of Ghost blogging platform. Ghost written in Node.js and was installed in cloud server with 1Gb RAM, 1 CPU. I noticed after 400 concurrent users JMeter getting errors. Till 400 concurrent users load is normal. I decide increase CPU and added 1 CPU. But errors reproduced and added 2 CPUs, totally 4 CPUs. The problem is occuring after 400 concurrent users. I don't understand why 1 CPU can handle 400 users and the same results with 4 CPUs. During monitoring I noticed that only one CPU is busy and 3 other CPUs idle. When I check JMeter summary in

I have created a window application in C#.Now I want to set the CPU affinity for this application.I may have 2 processors,4 processors,8 processors or may be more than 8 processors. I want to set the cpu affinity using input from interface. How can i achieve this? How can it is possible to set the affinity using Environment.ProcessorCount? Try this: Process.GetCurrentProcess().ProcessorAffinity = (System.IntPtr)2; Here 's more about it. ProcessorAffinity represents each processor as a bit. Bit 0 represents processor one, bit 1 represents processor two, and so on. The following table shows a

For sake of example, imagine i was building a virtual machine. I have a byte array and a while loop, how do i know how many bytes to read from the byte array for the next instruction to interpret a intel 8086 like instruction? EDIT: (commented) the cpu reads the opcode at the instruction pointer, with 8086 and CISC you have one byte and two byte instructions. How do i know if the next instruction is F or FF? EDIT: Found a ansew myself in this peice of text on http://www.swansontec.com/sintel.html The operation code, or opcode, comes after any optional prefixes. The opcode tells the processor

I have been reading Wikipedia's article on K programming language and this is what I saw: The small size of the interpreter and compact syntax of the language makes it possible for K applications to fit entirely within the level 1 cache of the processor. I am intrigued. How is it possible to have the whole program in L1 cache? Say, CPU has 256kb L1 cache. Say my program is way less than that and it needs a very little amount of memory (say, just for the call stack and such). Say, it doesn't need any libraries (although if a program is for an OS, it would need to include kernel32.dll or

I have an app with a WebView. When the Activity pauses (onPause) i call the appropiate webview.onPause and webview.stopTimers, these are balanced with the webview.onResume and webview.resumeTimers in the Activity.onResume method. Now when i load www.google.com in the webview, and then put the app in the background, it will still use up to 30% CPU! This is much too much. I performed method profiling and saw that the WebViewCoreThread was doing every 100ms something with MessageQueue.nativePollOnce -> WebViewCore.nativeSetScrollOffset, this caused a repaint of the webview (while in the bakground