CPU-T | An open source CPU detection software

I am trying to understand the clock_t clock(void); function better and have following question:

Did I understand that correctly that clock measures the number of ticks of a process since it is actively running and sleep suspends the calling thread – in this case there is only one thread, namely the main-thread – and therefore suspends the whole process. Which means that clock does not measure the cpu-time (ticks) of the process, since it is not actively running?
If so what is the recommended way to measure the actual needed time?

"The clock() function returns an approximation of processor time used by the program." Source
"The CPU time (process time) is measured in clock ticks or seconds." Source
"The number of clock ticks per second can be obtained using: sysconf(_SC_CLK_TCK);" Source

In Vulkan:

1. Multiple VkDescriptorPools can be created.
2. From each single VkDescriptorPool multiple VkDescriptorSets can be allocated.

Is there any limit to the number of VkDescriptorPools you can create? (apart from available memory)

Is there any indication in the spec of the overhead (memory, cpu-time, gpu-time) of using many small VkDescriptorPools versus using a few large ones? Or doesn't it generally matter?

hello I'm a beginner for linux. This is the command I want to run with different parameters:

I'm trying to run my first full-system simulation in Gem5, but I got the following error

I have a full-year hourly series, that we may call "calendar":

I want use this code to get cpu temperature from my raspberry_pi and if the temperature is too high sending an warn email , the code show below:

I have page displayed using cards which shows threaddump information. Threaddump information are shown using v-for, the problem is when I copy , it copies only single loop of data with my current copyThreadInfoToClipboard method. So, my requests are,

1. How can I copy the entire loop of data?
2. How can I escape sub-element tags in the copied selection text like in this example and ...

I know that this question sounds like an easy question and a duplicate of former ones, in which boost.timer and the chrono facility of C++11 are given as answers.

But, what I have in mind is a bit different and I found no answer to it either on StackOverflow or elsewhere:

In my (C++11) program on Ubuntu Linux, I start several threads with std::async and the std::future mechanism.

Inside every thread I measure CPU-Time with boost.timer(). If I start only one thread I get a CPU time of (in my example) ~0.39 sec and an equal WC time of ~0.39 sec.

If I start several threads I get a longer WC time for each, say 0.8 sec for 16 threads and now the CPU-time for each is about 6.4 sec, that is 8 * 0.8 sec (I have a quad-core Xeon CPU).

So the CPU-Time of each thread is seemingly multiplied by the (number of CPU cores) * 2.

Of course(?) I would like to see a CPU-time near 0.39 sec for each thread, as this is probably still the time the thread uses the CPU for its purposes. The longer CPU time shown (multiplied with the "CPU number factor") is not so much of help in gauging the true CPU consumption of each thread separately.

For illustration I append my test program and its output, first for one thread, then for 16 threads.

So my question is: What can I do, which library, function or programming technique can I use, to get the true CPU usage of each thread which should not change much with the number of threads started?

I want to display a FHD live-stream (25 fps) and overlay some (changing) text. For this I essentially use the code below.

Basically it is

1. Load frame
2. (cv::putText skipped here)
3. Display frame if it's a multiple of delay

but the code is super super slow compared to e.g. mpv and consumes way to much cpu-time (cv::useOptimized() == true).

So far delay is my inconvenient fiddle-parameter to somehow make it feasible.

• delay == 1 results in 180 % CPU usage (full frame-rate)
• delay == 5 results in 80 % CPU usage

But delay == 5 or 5 fps is really sluggish and actually still too much cpu load.

How can I make this code faster or otherwise better or otherwise solve the task (I'm not bound to opencv)?

P.s. Without cv::imshow the CPU usage is less than 30 %, regardless of delay.