I had a slightly similar issue with gzip. Assuming we want to decrease the CPU of a gzip process: gzip backup.tar & sleep 2 & cpulimit –limit 10 -e gzip -z Options: I found sleep useful as the cpulimit sometimes didn’t pick up the new gzip process immediately –limit 10 limits gzip CPU usage to … Read more
Yes, and no. CLZ (count leading zero) and BSR (bit-scan reverse) are related but different. CLZ equals (type bit width less one) – BSR. CTZ (count trailing zero), also know as FFS (find first set) is the same as BSF (bit-scan forward.) Note that all of these are undefined when operating on zero! In answer … Read more
You ask about C++, but the specifics of floating-point values and encodings are determined by a floating-point specification, notably IEEE 754, and not by C++. IEEE 754 is by far the most widely used floating-point specification, and I will answer using it. In IEEE 754, binary floating-point values are encoded with three parts: A sign … Read more
Truth to be told, it depends on the hardware. A library that works on most hardware is OpenHardwareMonitorLib. Unfortunately, it has no documentation and actually doesn’t really exist as an independent piece of software. It’s part of an open source software named “Open Hardware Monitor”. it’s done in .NET C Sharp and of course, only … Read more
It’s about locking the memory bus for that address. The Intel 64 and IA-32 Architectures Software Developer’s Manual – Volume 3A: System Programming Guide, Part 1 tells us: 7.1.4 Effects of a LOCK Operation on Internal Processor Caches. For the Intel486 and Pentium processors, the LOCK# signal is always asserted on the bus during a … Read more
CPU register is always faster than the L1 cache. It is the closest. The difference is roughly a factor of 3. Trying to make this as intuitive as possible without getting lost in the physics underlying the question: there is a simple correlation between speed and distance in electronics. The further you make a signal … Read more
in the local.properties file in my project I have org.gradle.daemon=true org.gradle.parallel=true org.gradle.configureondemand=true additionally you can specify org.gradle.parallel.threads which specifies the maximum number of threads to use for parallel execution. it needs org.gradle.parallel=true. Here you can find more information about it
I don’t think you will get any truly portable answers, so I will give a correct one. The correct* answer for Linux is len(os.sched_getaffinity(pid)), where pid may be 0 for the current process. This function is exposed in Python 3.3 and later; if you need it in earlier, you’ll have to do some fancy cffi … Read more
There is no standard Unix command, AFAIK. I haven’t used Sun OS, but on Linux, you can use this: cat /proc/cpuinfo Sorry that it is Linux, not Sun OS. There is probably something similar though for Sun OS.
I’ll expand on my comments here. This is too big and in-depth for me to fit in the comments. What you’re trying to do is very difficult – to the point of being impractical for the following reasons: There’s no portable way to get the processor frequency. rdtsc does NOT always give the correct frequency … Read more