cpu - w3toppers.com

Detecting the number of processors

System.Environment.ProcessorCount returns the number of logical processors http://msdn.microsoft.com/en-us/library/system.environment.processorcount.aspx For physical processor count you’d probably need to use WMI – the following metadata is supported in XP/Win2k3 upwards (Functionality enabled in SP’s prior to Vista/Win2k8). Win32_ComputerSystem.NumberOfProcessors returns physical count Win32_ComputerSystem.NumberOfLogicalProcessors returns logical (duh!) Be cautious that HyperThreaded CPUs appear identical to multicore’d CPU’s yet the performance … Read more

How does the CPU do subtraction?

The whole reason we use 2’s-complement is that addition is the same whether the numbers are positive or negative – there are no special cases to consider, like there are with 1’s-complement or signed-magnitude representations. So to find A-B, we can just negate B and add; that is, we find A + (-B), and because … Read more

Identifying the CPU architecture type using C#

You could also try (only works if it’s not manipulated): System.Environment.GetEnvironmentVariable(“PROCESSOR_ARCHITECTURE”)

Getting CPU temperature using Python?

There is a newer “sysfs thermal zone” API (see also LWN article and Linux kernel doc) showing temperatures under e.g. /sys/class/thermal/thermal_zone0/temp Readings are in thousandths of degrees Celcius (although in older kernels, it may have just been degrees C).

Tensorflow: executing an ops with a specific core of a CPU

There’s no API for pinning ops to a particular core at present, though this would make a good feature request. You could approximate this functionality by creating multiple CPU devices, each with a single-threaded threadpool, but this isn’t guaranteed to maintain the locality of a core-pinning solution: with tf.device(“/cpu:4”): # … with tf.device(“/cpu:7”): # … … Read more

Finding out the CPU clock frequency (per core, per processor)

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

x86 LOCK question on multi-core CPUs

Accurate calculation of CPU usage given in percentage in Linux?

According the htop source code, my assumptions looks like they are valid: (see static inline double LinuxProcessList_scanCPUTime(LinuxProcessList* this) function at LinuxProcessList.c) // Guest time is already accounted in usertime usertime = usertime – guest; # As you see here, it subtracts guest from user time nicetime = nicetime – guestnice; # and guest_nice from nice … Read more

How to create a CPU spike with a bash command

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

Difference between core and processor

A core is usually the basic computation unit of the CPU – it can run a single program context (or multiple ones if it supports hardware threads such as hyperthreading on Intel CPUs), maintaining the correct program state, registers, and correct execution order, and performing the operations through ALUs. For optimization purposes, a core can … Read more