jobs_execution_1.v

import time

type Task fn (data voidptr)
pub fn (t Task) str() string {
	return 'Task{ ${ptr_str(t)} }'
}

fn task_default(data voidptr){
	//	println('task_default: $data')
}

fn task_zero(data voidptr){
	mut i := &int(data)
	*i = 0
}
fn task_multiply_int(data voidptr){
	mut i := &int(data)
	*i = *i * 100
}

struct Job {
mut:
	task Task = task_default as Task
	data voidptr
}

fn (j Job) execute(){
	t := j.task
	if isnil(t){
		return
	}
	t( j.data )
}

fn (jobs []Job) execute(){
	for j in jobs {
		j.execute()
	}
}

fn main(){
	n := 1000*1000
	mut data := [0].repeat(n)
	mut jobs := [Job{ data:voidptr(0) }].repeat(n)
	for i:=0; i<jobs.len; i++{
		data[i] = i
		jobs[i].data = &data[i]
		match i % 3 {
			0 { jobs[i].task = task_zero as Task }
			1 { jobs[i].task = task_multiply_int as Task }
			else {}
		}
	}
	println('Before:  data[at start]:' + data[0..10].str() )
	println('Before:  data[at   end]:' + data[ data.len - 10 .. data.len].str() )
	sticks := time.ticks()
	jobs.execute()
	eticks := time.ticks()
	println('After :  data[at start]:' + data[0..10].str() )
	println('After :  data[at   end]:' + data[ data.len - 10 .. data.len].str() )
	println('Execution took: ${eticks-sticks}ms')
}

On my Intel(R) Core(TM) i3-3225 CPU @ 3.30GHz, I get:

0[10:53:56] /v/nv LINUX $ ./v -cc clang-7 -prod run /v/misc/jobs_execution_1.v
Before:  data[at start]:[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Before:  data[at   end]:[999990, 999991, 999992, 999993, 999994, 999995, 999996, 999997, 999998, 999999]
After :  data[at start]:[0, 100, 2, 0, 400, 5, 0, 700, 8, 0]
After :  data[at   end]:[0, 99999100, 999992, 0, 99999400, 999995, 0, 99999700, 999998, 0]
Execution took: 5ms
0[10:53:59] /v/nv LINUX $ ./v -cc gcc-9 -prod run /v/misc/jobs_execution_1.v
Before:  data[at start]:[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Before:  data[at   end]:[999990, 999991, 999992, 999993, 999994, 999995, 999996, 999997, 999998, 999999]
After :  data[at start]:[0, 100, 2, 0, 400, 5, 0, 700, 8, 0]
After :  data[at   end]:[0, 99999100, 999992, 0, 99999400, 999995, 0, 99999700, 999998, 0]
Execution took: 8ms
0[10:54:08] /v/nv LINUX $
0[10:54:10] /v/nv LINUX $
0[10:54:10] /v/nv LINUX $ ./v -cc clang-7 run /v/misc/jobs_execution_1.v
Before:  data[at start]:[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Before:  data[at   end]:[999990, 999991, 999992, 999993, 999994, 999995, 999996, 999997, 999998, 999999]
After :  data[at start]:[0, 100, 2, 0, 400, 5, 0, 700, 8, 0]
After :  data[at   end]:[0, 99999100, 999992, 0, 99999400, 999995, 0, 99999700, 999998, 0]
Execution took: 17ms
0[10:54:14] /v/nv LINUX $ ./v -cc gcc-9 run /v/misc/jobs_execution_1.v
Before:  data[at start]:[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Before:  data[at   end]:[999990, 999991, 999992, 999993, 999994, 999995, 999996, 999997, 999998, 999999]
After :  data[at start]:[0, 100, 2, 0, 400, 5, 0, 700, 8, 0]
After :  data[at   end]:[0, 99999100, 999992, 0, 99999400, 999995, 0, 99999700, 999998, 0]
Execution took: 22ms
0[10:54:19] /v/nv LINUX $