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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 |
- What do Etcd, Consul, and Zookeeper do?
- Service Registration:
- Host, port number, and sometimes authentication credentials, protocols, versions numbers, and/or environment details.
- Service Discovery:
- Ability for client application to query the central registry to learn of service location.
- Consistent and durable general-purpose K/V store across distributed system.
- Some solutions support this better than others.
- Based on Paxos or some derivative (i.e. Raft) algorithm to quickly converge to a consistent state.
- Service Registration:
- Centralized locking can be based on this K/V store.
To remove a submodule you need to:
- Delete the relevant section from the .gitmodules file.
- Stage the .gitmodules changes git add .gitmodules
- Delete the relevant section from .git/config.
- Run git rm --cached path_to_submodule (no trailing slash).
- Run rm -rf .git/modules/path_to_submodule (no trailing slash).
- Commit git commit -m "Removed submodule "
- Delete the now untracked submodule files rm -rf path_to_submodule
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#!/bin/bash | |
GFWLIST=https://autoproxy-gfwlist.googlecode.com/svn/trunk/gfwlist.txt | |
PROXY=127.0.0.1:7070 | |
cd `dirname "${BASH_SOURCE[0]}"` | |
echo "Downloading gfwlist from $GFWLIST" | |
curl "$GFWLIST" --socks5-hostname "$PROXY" > /tmp/gfwlist.txt | |
/usr/local/bin/gfwlist2pac \ | |
--input /tmp/gfwlist.txt \ |
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#!/usr/bin/env python | |
# Author: Chris Eberle <[email protected]> | |
# Watch for any changes in a module or package, and reload it automatically | |
import pyinotify | |
import imp | |
import os | |
class ModuleWatcher(pyinotify.ProcessEvent): | |
""" |
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import sys | |
import win32com.client | |
openedDoc = win32com.client.Dispatch("Excel.Application") | |
filename= sys.argv[1] | |
password_file = open ( 'wordlist.lst', 'r' ) | |
passwords = password_file.readlines() | |
password_file.close() | |
passwords = [item.rstrip('\n') for item in passwords] |
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// Use Gists to store code you would like to remember later on | |
console.log(window); // log the "window" object to the console |