low-latency

Question : 3 while loops below contain code that has been commented out. I search for ("TAG1", "TAG2", and "TAG3") for easy identification. I simply want the while loops to wait on the condition tested to become true before proceeding while minimizing CPU resources as much as possible. I first tried using Boost condition variables, but there's a race condition. Putting the thread to sleep for 'x' microseconds is inefficient because there is no way to precisely time the wakeup. Finally, boost::this_thread::yield() does not seem to do anything. Probably because I only have 2 active threads on a

I have tried an experiment where I built a simple Producer/Consumer program. They run in separate threads. The producer generates some data and the consumer picks it up in another thread. The messaging latency I achieved is approximately 100 nano seconds. Can anybody tell me if this is reasonable or are there significantly faster implementations out there? I'm not using locks ... just simple memory counters. My experiment is described here: http://tradexoft.wordpress.com/2012/10/22/how-to-move-data-between-threads-in-100-nanoseconds/ Basically the consumer waits on a counter to be incremented

The code below demonstrates the problem unequivocally , which is: The exact same block of code becomes slower after a busy spin pause. Note that of course I'm not using Thread.sleep . Also note that there are no conditionals leading to a HotSpot/JIT de-optimization as I'm changing the pause using a math operation, not an IF . There is a block of math operations that I want to time. First I time the block pausing 1 nanosecond before I start my measurement. I do that 20,000 times. Then I change the pause from 1 nanosecond to 5 seconds and proceed to measure the latency as usual. I do that 15

I have successfully installed icecast and darkice on my ubuntu machine and was able to stream live on my lan. but to my disappointment it has a 15sec to 20sec delay.This is very poor performance. I don't think it is because of my lan connection because even when i tried to listen in that same ubuntu machine there was still a delay! I have tried to configure icecast to have no burst-size which means there will be no buffering,this helped me reduce the delay to around 6sec to 8sec. So please if you have any suggestions or very good configuration values it would be of great help to me. P.S the

My application contains several latency-critical threads that "spin", i.e. never blocks. Such thread expected to take 100% of one CPU core. However it seems modern operation systems often transfer threads from one core to another. So, for example, with this Windows code: void Processor::ConnectionThread() { while (work) { Iterate(); } } I do not see "100% occupied" core in Task manager, overall system load is 36-40%. But if I change it to this: void Processor::ConnectionThread() { SetThreadAffinityMask(GetCurrentThread(), 2); while (work) { Iterate(); } } Then I do see that one of the CPU