jm + reference   29

'AWS Lambda cheatsheet' -- a quick ref card for Lambda users
aws  lambda  ops  serverless  reference  quick-references 
4 weeks ago by jm
'All the information you need while traveling including visa requirements, currency, electricity, communication info and more.'
travel  reference  visas  holidays 
september 2016 by jm
Visual Representation of SQL Joins
useful bookmark to have (via Nelson)
sql  joins  mysql  reference  database 
march 2016 by jm
"So you have a mess on your hands" [png]
Excellent flowchart of how to fix common git screwups (via ITC slack)
git  reference  flowchart  troubleshooting  help  coding  via:itc 
january 2016 by jm
The Algorithmist is a resource dedicated to anything algorithms - from the practical realm, to the theoretical realm. There are also links and explanation to problemsets.

A wiki for algorithms. Not sure if this is likely to improve on Wikipedia, which of course covers the same subject matter quite well, though
algorithms  reference  wikis  coding  data-structures 
september 2015 by jm
A strongly specified, highly compatible implementation of Markdown
reference  markdown  commonmark  specs  formatting  text  compatibility 
may 2015 by jm
You Cannot Have Exactly-Once Delivery
Cut out and keep:
Within the context of a distributed system, you cannot have exactly-once message delivery. Web browser and server? Distributed. Server and database? Distributed. Server and message queue? Distributed. You cannot have exactly-once delivery semantics in any of these situations.
distributed  distcomp  exactly-once-delivery  networking  outages  network-partitions  byzantine-generals  reference 
march 2015 by jm
An _extremely_ detailed resource about the bash bug
bash  hacking  security  shell  exploits  reference  shellshock 
october 2014 by jm's reference page for java.lang.OutOfMemoryError
With examples of each possible cause of a Java OOM, and suggested workarounds. succinct
reference  oom  java  memory  heap  ops 
june 2014 by jm
storage of structured data in a continuous block of memory. The memory can be allocated on the heap using a byte[] array or can be allocated off the java heap in native memory. [...] Use cases: store/cache huge amounts of data records without impact on GC duration; high performance data transfer in a cluster or in between processes

handy OSS from Ruediger Moeller
structs  java  jvm  memory  off-heap  storage  reference 
may 2014 by jm
The Stony Brook Algorithm Repository
This WWW page is intended to serve as a comprehensive collection of algorithm implementations for over seventy of the most fundamental problems in combinatorial algorithms. The problem taxonomy, implementations, and supporting material are all drawn from my [ie. Steven Skiena's] book 'The Algorithm Design Manual'. Since the practical person is more often looking for a program than an algorithm, we provide pointers to solid implementations of useful algorithms, when they are available.
algorithms  reference  coding  steven-skiena  combinatorial  cs 
march 2014 by jm
xkcd: Now
bookmarking as a future reference
timezones  time  world  clock  xkcd  images  midnight  reference 
february 2014 by jm
Making sense out of BDB-JE fast stats
good info on the system metrics recorded by BDB-JE's EnvironmentStats code, particularly where cache and cleaner activity are concerned. Particularly useful for Voldemort
voldemort  caching  bdb  bdb-je  storage  tuning  ops  metrics  reference 
may 2013 by jm
The useful JVM options
a good reference, with lots of sample output. Not clear if it takes 1.6/1.7 differences into account, though
jvm  reference  java  ops  hotspot  command-line 
april 2013 by jm
JPL Institutional Coding Standard for the Java Programming Language
From JPL's Laboratory for Reliable Software (LaRS). Great reference; there's some really useful recommendations here, and good explanations of familiar ones like "prefer composition over inheritance". Many are supported by FindBugs, too.

Here's the full list:

compile with checks turned on;
apply static analysis;
document public elements;
write unit tests;
use the standard naming conventions;
do not override field or class names;
make imports explicit;
do not have cyclic package and class dependencies;
obey the contract for equals();
define both equals() and hashCode();
define equals when adding fields;
define equals with parameter type Object;
do not use finalizers;
do not implement the Cloneable interface;
do not call nonfinal methods in constructors;
select composition over inheritance;
make fields private;
do not use static mutable fields;
declare immutable fields final;
initialize fields before use;
use assertions;
use annotations;
restrict method overloading;
do not assign to parameters;
do not return null arrays or collections;
do not call System.exit;
have one concept per line;
use braces in control structures;
do not have empty blocks;
use breaks in switch statements;
end switch statements with default;
terminate if-else-if with else;
restrict side effects in expressions;
use named constants for non-trivial literals;
make operator precedence explicit;
do not use reference equality;
use only short-circuit logic operators;
do not use octal values;
do not use floating point equality;
use one result type in conditional expressions;
do not use string concatenation operator in loops;
do not drop exceptions;
do not abruptly exit a finally block;
use generics;
use interfaces as types when available;
use primitive types;
do not remove literals from collections;
restrict numeric conversions;
program against data races;
program against deadlocks;
do not rely on the scheduler for synchronization;
wait and notify safely;
reduce code complexity
nasa  java  reference  guidelines  coding-standards  jpl  reliability  software  coding  oo  concurrency  findbugs  bugs 
march 2013 by jm
OS X Lion tweaks
A bunch of magic command lines to set useful OS X prefs without pointy-clicky. at least some also seem to work on Mountain Lion
tweaks  lion  mac  reference  cli  mountain-lion  macosx 
march 2013 by jm
RFC 6585 - Additional HTTP Status Codes
includes "429 Too Many Requests", for rate limits
api  rfc  http  reference  standards  web  rest 
march 2013 by jm
"Security Engineering" now online in full
Ross Anderson says: 'I’m delighted to announce that my book Security Engineering – A Guide to Building Dependable Distributed Systems is now available free online in its entirety. You may download any or all of the chapters from the book’s web page.'
security  books  reference  coding  software  encryption  ross-anderson 
february 2013 by jm
Scala 2.8 Collections API -- Performance Characteristics
wow. Every library vending a set of collection types should have a page like this
collections  scala  performance  reference  complexity  big-o  coding 
january 2013 by jm
"The cost per element in major data structures offered by Java and Guava (r11)]." A very useful reference!

Ever wondered what's the cost of adding each entry to a HashMap? Or one new element in a TreeSet? Here are the answers: the cost per-entry for each well-known structure in Java and Guava. You can use this to estimate the cost of a structure, like this: if the per-entry cost of a structure is 32 bytes, and your structure contains 1024 elements, the structure's footprint will be around 32 kilobytes. Note that non-tree mutable structures are amortized (adding an element might trigger a resize, and be expensive, otherwise it would be cheap), making the measurement of the "average per element cost" measurement hard, but you can expect that the real answers are close to what is reported below.
java  coding  guava  reference  memory  cost  performance  data-structures 
october 2012 by jm
A few git tips you didn't know about
'git checkout -t' alone is worth the bookmark
git  tips  coding  unix  reference  tricks  via:proggit 
september 2011 by jm
Python Idioms and Efficiency Suggestions
will have to run this by our resident Pythonistas in work as a good set of guidelines
idioms  programming  python  reference  tips  via:hn 
june 2011 by jm
Nelson Minar on map tiles
quite a lot of detail into the prevailing state of the art in how online zoomable maps store their tiles
mapping  maps  google-maps  nelson  reference  tiling  storage 
april 2011 by jm
practical Linux commands quick-ref sheet
from Padraig Brady. lots of nice one-liners I wasn't familiar with
padraig-brady  bash  cli  linux  reference  sysadmin  tips  commands  from delicious
june 2010 by jm
Every Time Zone
"Never warp your brain with time zone math again." Quite a useful javascript TZ conversion tool, although it could be more intuitive still
conversion  javascript  reference  timezones  time  international  from delicious
april 2010 by jm

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