If I understand correctly, performance-wise, flipping the sign of Z and the depth test is nothing but changing a < comparison to a > comparison. So, if I understand correctly and the author isn’t lying or making things up, then changing < to > used to be a vital optimization for many games. I didn’t … Read more
I use stress for this kind of thing, you can tell it how many cores to max out.. it allows for stressing memory and disk as well. Example to stress 2 cores for 60 seconds stress –cpu 2 –timeout 60
If your threads don’t do I/O, synchronization, etc., and there’s nothing else running, 1 thread per core will get you the best performance. However that very likely not the case. Adding more threads usually helps, but after some point, they cause some performance degradation. Not long ago, I was doing performance testing on a 2 … Read more
The psutil library gives you information about CPU, RAM, etc., on a variety of platforms: psutil is a module providing an interface for retrieving information on running processes and system utilization (CPU, memory) in a portable way by using Python, implementing many functionalities offered by tools like ps, top and Windows task manager. It currently … Read more
grep -c ^processor /proc/cpuinfo will count the number of lines starting with “processor” in /proc/cpuinfo For systems with hyper-threading, you can use grep ^cpu\\scores /proc/cpuinfo | uniq | awk ‘{print $4}’ which should return (for example) 8 (whereas the command above would return 16)
Windows Some of the above values are easily available from the appropriate Win32 API, I just list them here for completeness. Others, however, need to be obtained from the Performance Data Helper library (PDH), which is a bit “unintuitive” and takes a lot of painful trial and error to get to work. (At least it … Read more
What is this warning about? Modern CPUs provide a lot of low-level instructions, besides the usual arithmetic and logic, known as extensions, e.g. SSE2, SSE4, AVX, etc. From the Wikipedia: Advanced Vector Extensions (AVX) are extensions to the x86 instruction set architecture for microprocessors from Intel and AMD proposed by Intel in March 2008 and … Read more