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Thread context switch Vs. process context switch
...t when you switch address space, more memory access (paging, segmentation, etc) and you have to flush TLB when entering or exiting a new process...
.bashrc at ssh login
...ly container for persistent storage) - BUT you may also want to check /etc/passwd to check your login shell is /bin/bash & not /bin/sh -------> /bin/dash
– Stuart Cardall
May 15 '15 at 22:27
...
How many threads is too many?
...you reach some bottleneck be it CPU, database throughput, disk throughput, etc, adding more threads won't increase the overall performance. But until you hit that point, add more threads!
Note that this assumes the system(s) in question are dedicated to your app, and you don't have to play nicely ...
How to benchmark efficiency of PHP script
...ws to define steps in the code and reports time, memory usage, server load etc between two steps.
Something like:
$appgati->Step('1');
// Do some code ...
$appgati->Step('2');
$report = $appgati->Report('1', '2');
print_r($report);
Sample output array:
Array
(
...
Is non-blocking I/O really faster than multi-threaded blocking I/O? How?
...rrent connections if the scarce resource is a connection-limited database, etc.).
Another way to put it is: allowing the operating system to interleave the usage of a single resource for two tasks cannot be faster than merely letting one task use the resource while the other waits, then letting the...
What is the difference between Trap and Interrupt?
...ted by the hardware (devices like the hard disk, graphics card, I/O ports, etc). These are asynchronous (i.e. they don't happen at predictable places in the user code) or "passive" since the interrupt handler has to wait for them to happen eventually.
You can also see a trap as a kind of CPU-intern...
How to detect idle time in JavaScript elegantly?
...idle " time in JavaScript?
My primary use case probably would be to pre-fetch or preload content.
38 Answers
...
Execute and get the output of a shell command in node.js
...utput);
});
});
}
Usage
async function main() {
try {
const passwdContent = await execute("cat /etc/passwd");
console.log(passwdContent);
} catch (error) {
console.error(error.toString());
}
try {
const shadowContent = await execute("cat /etc/shadow");
console...
Nodejs Event Loop
...output asynchronously. It handles file descriptors, data handlers, sockets etc. You can read more about it here here.
LibUv is an abstraction layer on the top of libeio , libev, c-ares ( for DNS ) and iocp (for windows asynchronous-io). LibUv performs, maintains and manages all the io and events in ...
Context switches much slower in new linux kernels
...you can do this by adding them to the GRUB_CMDLINE_LINUX_DEFAULT entry in /etc/default/grub and then running update-grub. The boot parameters to add are:
intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll
Here are the gory details about what the three boot options do:
Setting intel_idle.ma...