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Albert Yang albertnetymk

  • Uppsala, Sweden
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Region types in G1

Let's introduce the region types used in G1:

eden: for newly added objects from-survivor: for objects in to-survivor from previous young-GC to-survivor: live objects in eden/from-survivor are copied here if they have not lived long old: live objects in eden/from-survivor are copied here if they have lived long

#include <iostream>
#include <cassert>
using namespace std;
static int a, b, c;
int new_sum(int sum, bool& terminated)

Find the max and min of sum of all permutations of [1..9] satisfying the following condition:

    == a[1] + a[2] + a[3]
    == a[3] + a[4] + a[5]
    == a[5] + a[6] + a[7]
    == a[7] + a[8]
    where sum = a[0] + a[1]

Racket lab

0 Background



DrRacket provides rudimentary features for Racket programming, you could experiment them by launch DrRacket directly. Some particularly interesting/useful ones are highlighted here:


Haskell lab

0. Warmup


Hoogle is the search engine for Haskell functions. It supports searching by function names and types.

For example, you plan to use parMap, but forget its type. You could just type parMap in Hoogle, and the search result would look like:

View box.hs
{-# LANGUAGE NamedFieldPuns #-}
import Data.List ((\\))
type Grid = [[Char]]
third_d :: Int -> Int -> Int
third_d x y = head $ [1..3] \\ [x,y]
data Op = L | R | U | D deriving (Show)
data State = State {

Def of project:

specific goal specific time period specific resource unique work arrangement temporary organization

The line is optimized towards routine work. When one new problem arises, one specific request is given to a project group through a project charter trying to solve this problem. After the problem is solved, the result is implemented in the line, and initiates new work routine in the line.

diffs between project manager and line manager:

View color_blender.c
#define MIN(a,b) (((a)<(b))?(a):(b))
typedef unsigned int uint;
typedef struct {
uint red:5;
uint green:6;
uint blue:5;
} f_pixel;
View hello.stp
global gc_major
global gc_minor
global gc_major_count
global gc_minor_count
global stat
global count_stat
probe process("/home/albert/github/otp/bin/x86_64-unknown-linux-gnu/beam.smp").mark("gc_major__start")
gc_major[user_string($arg1)] = gettimeofday_ms() - gc_major[user_string($arg1)]
View cache.c
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
// copied from
void insertion_sort (int *a, int n) {
int i, j, t;
for (i = 1; i < n; i++) {
t = a[i];
for (j = i; j > 0 && t < a[j - 1]; j--) {