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How can I shuffle the lines of a text file on the Unix command line or in a shell script?
...
Here is a first try that's easy on the coder but hard on the CPU which prepends a random number to each line, sorts them and then strips the random number from each line. In effect, the lines are sorted randomly:
cat myfile | awk 'BEGIN{srand();}{print rand()"\t"$0}' | sort -k1 -n | c...
Is “double hashing” a password less secure than just hashing it once?
...on the server if you had a large user base, because you are relying on the CPU load to slow down the number of requests. It means that if you add more CPU power, you are reducing the restriction on those brute force attackers. -- However, you are completely correct about the scalability, and the wid...
What is the volatile keyword useful for?
...So if Thread A is creating Singleton instance and just after creation, the CPU corrupts etc, all other threads will not be able to see the value of _instance as not null and they will believe it is still assigned null.
Why does this happen? Because reader threads are not doing any locking and unt...
How do I increase the RAM and set up host-only networking in Vagrant?
...
To increase the memory or CPU count when using Vagrant 2, add this to your Vagrantfile
Vagrant.configure("2") do |config|
# usual vagrant config here
config.vm.provider "virtualbox" do |v|
v.memory = 1024
v.cpus = 2
end
e...
jquery find closest previous sibling with class
...ling without having to get all. I had a particularly long set that was too CPU intensive using prevAll().
var category = $('li.current_sub').prev('li.par_cat');
if (category.length == 0){
category = $('li.current_sub').prevUntil('li.par_cat').last().prev();
}
category.show();
This gets the firs...
PostgreSQL: Difference between text and varchar (character varying)
... increased storage space when using the blank-padded type, and a few extra CPU cycles to check the length when storing into a length-constrained column. While character(n) has performance advantages in some other database systems, there is no such advantage in PostgreSQL; in fact character(n) is usu...
What data type to use for hashed password field and what length?
...le numerical value, others have more parameters there (for example to tune CPU usage and RAM usage separately).
The salt. Since the salt must be globally unique, it has to be stored for each account. The salt should be generated randomly on each password change.
The hash proper, i.e. the output of t...
`testl` eax against eax?
...and sometimes faster (can macro-fuse into a compare-and-branch uop on more CPUs in more cases than CMP). That makes test the preferred idiom for comparing a register against zero. It's a peephole optimization for cmp reg,0 that you can use regardless of the semantic meaning.
The only common reaso...
What does 'synchronized' mean?
...queue and starts executing. In the above example, THREAD 3 happened to get CPU before THREAD 2.
– Sahil J
Apr 7 '17 at 6:07
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show 2 more co...
What is difference between sjlj vs dwarf vs seh?
...looking for? Browse other questions tagged c++ compiler-construction mingw cpu-architecture mingw-w64 or ask your own question.