Simple answer – it doesn’t. Machine code instructions are just binary numbers, as are data. More complicated answer – your processor may (or may not) provide segmentation of memory, meaning that attempting to execute what has been specified as data causes a trap of some sort. This is one of the the meaning of a … Read more
I don’t believe there’s anything within .NET to allow copying a section of a file without buffering it in memory. However, it strikes me that this is inefficient anyway, as it needs to open the input file and seek many times. If you’re just splitting up the file, why not open the input file once, … Read more
If you have a large array of numbers, then go with the smallest size that works. It will be more efficient to work with an array of 16 bit shorts than 32 bit ints since you get twice the cache density. The cost of any sign extension the CPU has to do to work with … Read more
I don’t think setInterval is inherently going to cause you significant performance problems. I suspect the reputation may come from an earlier era, when CPUs were less powerful. There are ways that you can improve the performance, however, and it’s probably wise to do them: Pass a function to setInterval, rather than a string. Have … Read more
To have frequency on Android, just read these special files in /sys directory: #cat “/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq” #cat “/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq” #cat “/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq” You will have current, min and max Frequency allowed.
The optimal number of threads to use depends on several factors, but mostly the number of available processors and how cpu-intensive your tasks are. Java Concurrency in Practice proposes the following formal formula to estimate the optimal number of threads: N_threads = N_cpu * U_cpu * (1 + W / C) Where: N_threads is the … Read more
The call stack could also be called a frame stack. The things that are stacked after the LIFO principle are not the local variables but the entire stack frames (“calls”) of the functions being called. The local variables are pushed and popped together with those frames in the so-called function prologue and epilogue, respectively. Inside … Read more
Yes there is. In fact, there are two separate ways to do it 🙂 Right now, the best way to accomplish what you want is to do the following: Add the parameter isolcpus=[cpu_number] to the Linux kernel command line from the boot loader during boot. This will instruct the Linux scheduler not to run any … Read more