| # Jason Giedymin | |
| # jasong _-@-_ apache _dot_ org | |
| # Try these options for your 64bit JVM. | |
| # Aggressive collection, Large-ish Memory footprint | |
| -Xss1024k -Xms512m -Xmx1408m -XX:MaxPermSize=512m -XX:ReservedCodeCacheSize=1024m -XX:+AggressiveOpts -XX:ParallelGCThreads=16 -XX:+UseConcMarkSweepGC -XX:+ExplicitGCInvokesConcurrent -XX:+UseCompressedOops | |
| # Aggressive collection but use memory if needed | |
| -Xss1024k -Xms128m -Xmx1408m -XX:MaxPermSize=128m -XX:ReservedCodeCacheSize=1024m -XX:+AggressiveOpts -XX:ParallelGCThreads=4 -XX:+UseConcMarkSweepGC -XX:+ExplicitGCInvokesConcurrent -XX:+UseCompressedOops |
| 16GB | |
| -Xmx8G -Xms8G -Xmn3072m -XX:+DisableExplicitGC -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+UseNUMA -XX:+CMSParallelRemarkEnabled -XX:MaxGCPauseMillis=30 -XX:GCPauseIntervalMillis=150 -XX:+UseAdaptiveGCBoundary -XX:-UseGCOverheadLimit -XX:+UseBiasedLocking -XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=15 -Dfml.ignorePatchDiscrepancies=true -Dfml.ignoreInvalidMinecraftCertificates=true -XX:+UseFastAccessorMethods -XX:+UseCompressedOops -XX:+OptimizeStringConcat -XX:+AggressiveOpts -XX:ReservedCodeCacheSize=2048M -XX:+UseCodeCacheFlushing -XX:SoftRefLRUPolicyMSPerMB=20000 -XX:ParallelGCThreads=10 | |
| 8GB: | |
| -Xmx4G -Xms4G -Xmn4096m -XX:+DisableExplicitGC -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+UseNUMA -XX:+CMSParallelRemarkEnabled -XX:MaxGCPauseMillis=30 -XX:GCPauseIntervalMillis=150 -XX:+UseAdaptiveGCBoundary -XX:-UseGCOverheadLimit -XX:+UseBiasedLocking -XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=15 -Dfml.ignorePatchDiscrepancies=true -Dfml.ignoreI |
| Go to Bitbucket and create a new repository (its better to have an empty repo) | |
| git clone git@bitbucket.org:abc/myforkedrepo.git | |
| cd myforkedrepo | |
| Now add Github repo as a new remote in Bitbucket called "sync" | |
| git remote add sync git@github.com:def/originalrepo.git | |
| Verify what are the remotes currently being setup for "myforkedrepo". This following command should show "fetch" and "push" for two remotes i.e. "origin" and "sync" | |
| git remote -v |
NOTE: The Tree-sitter API and documentation has changed and improved since this guide was created. I can't guarantee this is up to date.
Tree-sitter is the new way Atom is providing language recognition features, such as syntax highlighting, code folding, autocomplete, and more. In contrast to TextMate grammars, which work by regex matching, Tree-sitter will generate an entire syntax tree. But more on that can be found in it's own docs.
Here, we look at making one from scratch.
| # Kernel sysctl configuration file for Linux | |
| # | |
| # Version 1.14 - 2019-04-05 | |
| # Michiel Klaver - IT Professional | |
| # http://klaver.it/linux/ for the latest version - http://klaver.it/bsd/ for a BSD variant | |
| # | |
| # This file should be saved as /etc/sysctl.conf and can be activated using the command: | |
| # sysctl -e -p /etc/sysctl.conf | |
| # | |
| # For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and sysctl.conf(5) for more details. |
I was talking to a coworker recently about general techniques that almost always form the core of any effort to write very fast, down-to-the-metal hot path code on the JVM, and they pointed out that there really isn't a particularly good place to go for this information. It occurred to me that, really, I had more or less picked up all of it by word of mouth and experience, and there just aren't any good reference sources on the topic. So… here's my word of mouth.
This is by no means a comprehensive gist. It's also important to understand that the techniques that I outline in here are not 100% absolute either. Performance on the JVM is an incredibly complicated subject, and while there are rules that almost always hold true, the "almost" remains very salient. Also, for many or even most applications, there will be other techniques that I'm not mentioning which will have a greater impact. JMH, Java Flight Recorder, and a good profiler are your very best friend! Mea
Disclaimer: This piece is written anonymously. The names of a few particular companies are mentioned, but as common examples only.
This is a short write-up on things that I wish I'd known and considered before joining a private company (aka startup, aka unicorn in some cases). I'm not trying to make the case that you should never join a private company, but the power imbalance between founder and employee is extreme, and that potential candidates would
###IAB1 Arts & Entertainment
IAB1-1 Books & Literature
IAB1-2 Celebrity Fan/Gossip
IAB1-3 Fine Art
IAB1-4 Humor
IAB1-5 Movies
IAB1-6 Music
IAB1-7 Television
###IAB2 Automotive
| // | |
| // Regular Expression for URL validation | |
| // | |
| // Author: Diego Perini | |
| // Updated: 2010/12/05 | |
| // License: MIT | |
| // | |
| // Copyright (c) 2010-2013 Diego Perini (http://www.iport.it) | |
| // | |
| // Permission is hereby granted, free of charge, to any person |
| • Node 1, 2, … X | |
| ○ sudo su -l | |
| ○ cd | |
| ○ apt-get update | |
| ○ apt-get upgrade | |
| ○ apt-get install git-core | |
| ○ apt-get install libyaml-dev | |
| ○ apt-get install erlang | |
| ○ apt-get install unzip | |
| ○ apt-get build-dep ejabberd |