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@posener
posener / go-shebang-story.md
Last active July 13, 2024 16:35
Story: Writing Scripts with Go

Story: Writing Scripts with Go

This is a story about how I tried to use Go for scripting. In this story, I’ll discuss the need for a Go script, how we would expect it to behave and the possible implementations; During the discussion I’ll deep dive to scripts, shells, and shebangs. Finally, we’ll discuss solutions that will make Go scripts work.

Why Go is good for scripting?

While python and bash are popular scripting languages, C, C++ and Java are not used for scripts at all, and some languages are somewhere in between.

@ryan-lane
ryan-lane / gist:e3f3bd08b75942107e52
Last active August 29, 2015 14:04
Load pillar files in the top file based on the grain
base:
# For each directory that can have pillar files
{% for root in opts['pillar_roots']['base'] -%}
# Set a variable to the path to check
{% set mygrain_sls = '{0}/{1}.sls'.format(root, grains['mygrain']) -%}
# Check to see if the file exists, if so, include that pillar file.
{% if salt['file.file_exists'](mygrain_sls) %}
'service_group:{{ grains["mygrain"] }}':
- match: grain
- {{ grains['mygrain'] }}

Glad you're here!

PuppetConf 2013 Presentation (fryman)

but!

let's keep this our secret. If the talk hasn't started yet, please don't tell those around you about this page. sure, hint and all... but it's more fun if they find it themselves. Also, don't tweet about this until I ask you to (and yes, I'll ask you to. Pretty please? can you? oh, you're the best. I knew you would.).

I do promise I'll tell everyone eventually, but for now you can feel good you found this page before your friend Bob.

@rgreenjr
rgreenjr / postgres_queries_and_commands.sql
Last active July 16, 2024 15:14
Useful PostgreSQL Queries and Commands
-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
FROM pg_stat_activity
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
ORDER BY query_start desc;
-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query
FROM pg_stat_activity
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'
@jboner
jboner / latency.txt
Last active July 17, 2024 03:12
Latency Numbers Every Programmer Should Know
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