#include <stdio.h>
#include <math.h>
#include <omp.h>
#define N 1000000
int main() {
double sum = 0;
double tbegin = omp_get_wtime();
#pragma omp parallel for reduction( +: sum )
for ( int i = 0; i < N; i++ ) {
sum += cos( i );
}
...
program typical_loop
use omp_lib
implicit none
integer, parameter :: N = 1000000, kd = kind( 1.d0 )
real( kind = kd ) :: sum, tbegin, wtime
integer :: i
sum = 0
tbegin = omp_get_wtime()
!$omp parallel do reduction( +: sum )
do i = 1, N
sum = ...
On a 8 cores Linux machine using GCC version 4.4, the C codes can be compiled and run the following way:
$ gcc -std=c99 -O3 -fopenmp loop.c -o loopc -lm
$ OMP_NUM_THREADS=1 ./loopc
Computing 1000000 cosines and summing them with 1 threads took 0.095832s
$ OMP_NUM_THREADS=2 ./loopc
Computing 100...
The following MATLAB script shows how to define and call a basic function:
myFun.m:
function [out1] = myFun(arg0, arg1)
out1 = arg0 + arg1;
end
terminal:
>> res = myFun(10, 20)
res =
30
Expression trees represent code in a tree-like data structure, where each node is an expression
Expression Trees enables dynamic modification of executable code, the execution of LINQ queries in various databases, and the creation of dynamic queries. You can compile and run code represented by expr...
to check if the given path exists
path = '/home/john/temp'
os.path.exists(path)
#this returns false if path doesn't exist or if the path is a broken symbolic link
configuration EnableIISFeature
{
node localhost
{
WindowsFeature IIS
{
Ensure = “Present”
Name = “Web-Server”
}
}
}
If you run this configuration in Powershell (EnableIISFeature), it will produce a localho...
To change the execution policy for the default scope (LocalMachine), use:
Set-ExecutionPolicy AllSigned
To change the policy for a specific scope, use:
Set-ExecutionPolicy -Scope CurrentUser -ExecutionPolicy AllSigned
You can suppress the prompts by adding the -Force switch.
Often you might need to execute an unsigned script that doesn't comply with the current execution policy. An easy way to do this is by bypassing the execution policy for that single process. Example:
powershell.exe -ExecutionPolicy Bypass -File C:\MyUnsignedScript.ps1
Or you can use the shorthan...
Getting the effective execution policy for the current session:
PS> Get-ExecutionPolicy
RemoteSigned
List all effective execution policies for the current session:
PS> Get-ExecutionPolicy -List
Scope ExecutionPolicy
----- ---------------
MachinePolicy Undefined...
Adding tags to "describe" or "it" blocks allows you to run only those examples with a given tag. Use the --tag (or -t) option to run examples that match a specified tag. The tag can be a simple name or a name:value pair.
If a simple name is supplied, only examples with :name...
$ npm install -g parse-server mongodb-runner
$ mongodb-runner start
$ parse-server --appId APPLICATION_ID --masterKey MASTER_KEY --databaseURI mongodb://localhost/test
You can use any arbitrary string as your application id and master key. These will be used by your clients to authenticate with...
You can also create an instance of Parse Server, and mount it on a new or existing Express website:
var express = require('express');
var ParseServer = require('parse-server').ParseServer;
var app = express();
var api = new ParseServer({
databaseURI: 'mongodb://localhost:27017/dev', // Conn...
The following example uses expect and receive to mock an Order's call to a CreditCardService, so that the test passes only if the call is made without having to actually make it.
class Order
def cancel
CreditCardService.instance.refund transaction_id
end
end
describe Order do
des...
In greeter.rb (wherever that goes in your project):
class Greeter
def greet
"Hello, world!"
end
end
In spec/greeter_spec.rb:
require_relative '../greeter.rb'
RSpec.describe Greeter do
describe '#greet' do
it "says hello" do
expect(Greeter.new.gr...
On StackOverflow, we often see code like this in Answers:
public String joinStrings(String a, String b) {
if (a == null) {
a = "";
}
if (b == null) {
b = "";
}
return a + ": " + b;
}
Often, this is accompanied with an asse...
Use vectors to calculate incremental [x,y] from [startX,startY] to [endX,endY]
// dx is the total distance to move in the X direction
var dx = endX - startX;
// dy is the total distance to move in the Y direction
var dy = endY - startY;
// use a pct (percentage) to travel the total distance...
Some Java programmers have a general aversion to throwing or propagating exceptions. This leads to code like the following:
public Reader getReader(String pathname) {
try {
return new BufferedReader(FileReader(pathname));
} catch (IOException ex) {
System.out.println(&q...
Let's have a look at various options to wait for completion of tasks submitted to Executor
ExecutorService invokeAll()
Executes the given tasks, returning a list of Futures holding their status and results when everything is completed.
Example:
import java.util.concurrent.*;
import ja...
