- L1 cache reference
0.5 ns
- Branch mispredict
5 ns
(on a bad CPU architecture you're pretty much screwed) - L2 cache reference
7 ns
- Mutex lock/unlock
25 ns
- Main memory reference
100 ns
- Compress 1K bytes with Zippy
3,000 ns
- Send 2K bytes over 1 Gbps network
20,000 ns
- Read 1 MB sequentially from memory
250,000 ns
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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 |
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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 | |
Send 1K bytes over 1 Gbps network 10,000 ns 0.01 ms | |
Read 1 MB sequentially from memory 250,000 ns 0.25 ms | |
Round trip within same datacenter 500,000 ns 0.5 ms | |
Read 1 MB sequentially from SSD 1,000,000 ns 1 ms 4X memory |
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#!/bin/sh | |
# ------------------------------------------------------- | |
# Run this script to create SSL certificates and files. | |
# These will be generated into the "ssl" subdirectory of | |
# the folder where this script file is located. | |
# ------------------------------------------------------- | |
# |
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// c++ -o nanoexr nanoexr.cpp && ./nanoexr /tmp/foo.exr | |
#include <cstdio> | |
// writes a tiled OpenEXR file from a float RGB buffer | |
struct Exr { | |
FILE* f; enum{TS=64}; ~Exr() { fclose(f); } | |
void B(unsigned char i) { fputc(i,f); } | |
void I(unsigned int i) { fwrite(&i,1,4,f); } | |
void L(unsigned long long i) { fwrite(&i,1,8,f); } | |
void F(float x) { fwrite(&x,1,4,f); } |
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# wget https://raw.githubusercontent.com/bridgetkromhout/devops-against-humanity/b824d328392ea5c27026f917653e35da1b12b0f8/cards-DevOpsAgainstHumanity.csv | |
WHITE_CARDS = [] | |
BLACK_CARDS = [] | |
FILL_ME_IN = "_____" | |
from random import choice | |
def load(): | |
global WHITE_CARDS |
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# Grant-ComputerJoinPermission.ps1 | |
# Written by Bill Stewart (bstewart@iname.com) | |
# | |
# Grants an AD identity the ability to join one or more computers to the | |
# domain. | |
#requires -version 2 | |
<# | |
.SYNOPSIS |
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# ------------------------------------------------------------------------------------------------------------ # | |
# --------------------------------------------- Signal Library ----------------------------------------------- # | |
# ------------------------------------------------------------------------------------------------------------ # | |
import weakref | |
class Signal(object): | |
def __init__(self, *types): | |
self._call_types = types | |
self._connections = set() |
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def keep_signature(input_function): | |
def to(function): | |
f_name = input_function.func_code.co_name | |
args = input_function.func_code.co_varnames[:input_function.func_code.co_argcount] | |
kw_list = input_function.func_defaults or [] | |
kwargs = args[-len(kw_list):] if len(kw_list) else [] # because kwargs are last | |
args = args[:len(kw_list)] if len(kw_list) else args | |
d_kwargs = {} | |
for k, v in zip(kwargs, kw_list): | |
d_kwargs[k] = v |
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using UnityEngine; | |
using UnityEditor; | |
using UnityEditor.SceneManagement; | |
using System.Collections.Generic; | |
using System.IO; | |
// Scene selection |
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