y1yang0

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

y1yang0

[Basic Information]
Version : (Alibaba Dragonwell Extended Edition 8.13.14) (1.8.0_352-b01) (25.352-b01)
Dump Reason : JCMD
MaxMetaspaceSize : 18446744073709547520 B
CompressedClassSpaceSize : 1073741824 B
Class Space Used : 309992 B
Class Space Capacity : 395264 B
Class Space Committed : 524288 B
Class Space Reserved : 1073741824 B
NonClass Spaces Used : 2638224 B

y1yang0

{
  "basic": {
    "version": "JDK11",
    "used": 1234,
    "max": 4567,
    "timestamp": 35783292
  },
  "symbols": [
    {
      "id": 123,

y1yang0

#include <iostream>
#include <vector>
#include <algorithm>
#include <memory>

bool permutation_std(int n);
bool permutation(int n);
static void permutation_impl(std::vector<int> arr, int n, int cur);

#ifdef _MSC_VER

y1yang0

/* Happy Valentine's Day
 * Built on vs2013
 * 2017.2.14
*/
#include <iostream>
#include <cassert>
template<int _letter_id>
struct CharWrapper{
	typedef void(CharWrapper::*FuncPtrType)(void);
	

y1yang0

REG ADD "HKCU\Control Panel\Desktop" /v DpiScalingVer /t REG_DWORD /d 0x00001018 /f
REG ADD "HKCU\Control Panel\Desktop" /v Win8DpiScaling /t REG_DWORD /d 0x00000001 /f
REG ADD "HKCU\Control Panel\Desktop" /v Logpixels /t REG_DWORD /d 0x00000078 /f