I want to calculate the GPU load but have no idea which file contains that. Is it also stored somewhere like the CPU load in the /proc/loadavg file ?
For nVidia gpus see the thread: checking GPU load on nVidia hardware? [solved]
For intel chips just type:
su -c 'intel_gpu_top'
on the command line.
Related
I want to use a simple program to measure the number of cycles required by VMFUNC instruction in x86 architecture on a Linux Ubuntu 18.04 machine. Is there any fast and accurate method? Thanks!
I got a linux server with Intel(R) Xeon(R) Silver 4110 CPU # 2.10GHz process which is up to 3.00Ghz due to Intel Turbo Boost technology.
However, when im checking cpuinfo it says that are cores are working on 2095.078Mhz like always.
There are no up's and down's - no matter what (heavy process on server etc).
(im checking it by running cat /proc/cpuinfo | grep "MHz")
For example my laptop shows different MHz for every command run.
There is also no scaling_governor setting (i wanted to set performance mode).
Running cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor tells that cpufreq folder doesnt exists at all.
Im just curious if my processor is hitting these 3.0 Turbo cuz i dont feel like it does.
I feel like im lacking some kind of drivers for frequency scaling.
It seems likely that this is your answer. If you can get the cpufreq driver loaded, you can consult the kernel docs to experiment and get the performance you want: kernel.org cpufreq doc.
I am working on intel rangeley board. I want to measure the total time taken to boot the linux kernel. Is there any possible and proven way to achieve this on intel board?
Try using rdtsc. According to the Intel insn ref manual:
The processor monotonically increments the time-stamp counter MSR
every clock cycle and resets it to 0 whenever the processor is reset.
See “Time Stamp Counter” in Chapter 17 of the Intel® 64 and IA-32
Architectures Software Developer’s Manual, Volume 3B, for specific
details of the time stamp counter behavior.
(see the x86 tag wiki for links to manuals)
Normally the TSC is only used for relative measurements between two points in time, or as a timesource. The absolute value is apparently meaningful. It ticks at the CPU's rated clock speed, regardless of the power-saving clock speed it's actually running at.
You might need to make sure you read the TSC from the boot CPU on a multicore system. The other cores might not have started their TSCs until Linux sent them an inter-processor interrupt to start them up. Linux might sync their TSCs to the boot CPU's TSC, since gettimeofday() does use the TSC. IDK, I'm just writing down stuff I'd be sure to check on if I wanted to do this myself.
You may need to take precautions to avoid having the kernel modify the TSC when using it as a timesource. Probably via a boot option that forces Linux to use a different timesource.
I have a 2.6 GHz Intel Core i7 running Linux. I am wondering how many interrupts on average my CPU gets per second.
Does anyone have a suggestion?
If you are using Linux you can
cat /proc/interrupts
And read the info with this page:
http://www.thegeekstuff.com/2014/01/linux-interrupts/
cat the file every second to see how the counters have changed and then calculate an average.
I am trying to reserve 10MB out of the 2GB onboard RAM on an embedded single-board computer that uses the Canyonlands (PowerPC-460EX) CPU. By reserve RAM, I mean block out a chunk of RAM that Linux will not touch so it will retain data on a warm-reboot. I am using the U-Boot bootloader, and I have tried the following methods:
1) Set mem=2038M in the bootargs envinronment variable
2) Set the 'pram' environment variable in U-Boot and then set mem=\${mem} in bootargs
Both methods failed to change the RAM seen by Linux. I am looking at /proc/meminfo to figure out how much RAM Linux sees as available. In both cases, /proc/meminfo sees 2074876 kB of RAM available (just under 2GB).
Any ideas?
I don't have enough points to comment, but here are some clues:
1) Check that your mem parameter is being passed correctly to the kernel. You should be able to do this using cat /proc/cmdline after you boot as suggested here.
2) Try using quotes around your parameters like "mem=2038M".