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Can linux cat command be used for writing text to file?
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I use the following code to write raw text to files, to update my CPU-settings. Hope this helps out!
Script:
#!/bin/sh
cat > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor <<EOF
performance
EOF
cat > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor <<EOF
pe...
Is there an equivalent to CTRL+C in IPython Notebook in Firefox to break cells that are running?
...it useful. This python script will find any jupyter kernel using more than cpu_threshold CPU and prompts the user to send a SIGINT to the kernel (KeyboardInterrupt). It will keep sending SIGINT until the kernel's cpu usage goes below cpu_threshold. If there are multiple misbehaving kernels it will p...
When should one use a spinlock instead of mutex?
...r, the operating system will forcefully switch to another thread, once the CPU runtime quantum of the current thread has been exceeded, of course).
The Problem
The problem with mutexes is that putting threads to sleep and waking them up again are both rather expensive operations, they'll need quit...
Is PHP compiled or interpreted?
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"object code" is just bytecode for the CPU's instruction decoder. (You don't think that CPUs actually have native instructions like "CMPSB", right?)
– jrockway
Oct 3 '09 at 20:58
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How to determine whether a given Linux is 32 bit or 64 bit?
... ==> 32-bit kernel
Otherwise, not for the Linux kernel, but for the CPU, you type:
cat /proc/cpuinfo
or:
grep flags /proc/cpuinfo
Under "flags" parameter, you will see various values: see "What do the flags in /proc/cpuinfo mean?"
Among them, one is named lm: Long Mode (x86-64: amd64, a...
What are the differences between the threading and multiprocessing modules?
...cores, and change your code to use 8 threads, it won't be able to use 800% CPU and run 8x faster; it'll use the same 100% CPU and run at the same speed. (In reality, it'll run a little slower, because there's extra overhead from threading, even if you don't have any shared data, but ignore that for ...
Approximate cost to access various caches and main memory?
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Numbers everyone should know
0.5 ns - CPU L1 dCACHE reference
1 ns - speed-of-light (a photon) travel a 1 ft (30.5cm) distance
5 ns - CPU L1 iCACHE Branch mispredict
7 ns - CPU L2 CACHE reference
71 ns - CPU cro...
Is gettimeofday() guaranteed to be of microsecond resolution?
... for Intel Processors
If you're on Intel hardware, here's how to read the CPU real-time instruction counter. It will tell you the number of CPU cycles executed since the processor was booted. This is probably the finest-grained counter you can get for performance measurement.
Note that this is t...
How to get current CPU and RAM usage in Python?
What's your preferred way of getting current system status (current CPU, RAM, free disk space, etc.) in Python? Bonus points for *nix and Windows platforms.
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Lock-free multi-threading is for real threading experts
...e from ensuring correct load/store ordering.
Contrary to one's intuitions, CPUs are free to reorder memory reads/writes - they are very smart, by the way: you will have a hard time observing this from a single thread. You will, however run into issues when you start to do multi-threading on multiple...