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@chilampoon
chilampoon / http_load_balancer_setup_gcp.sh
Created July 14, 2021 20:51
Set up an HTTP load balancer with a managed instance group of 2 nginx web servers on Google Cloud Platform (Qwiklab)
# setup
gcloud auth list
gcloud config set compute/zone us-east1-b
gcloud config set compute/region us-east1
# create an instance template
cat << EOF > startup.sh
#! /bin/bash
apt-get update
apt-get install -y nginx
@crisidev
crisidev / grafana-dashboard-exporter
Created October 7, 2015 20:35
Command to export all grafana 2 dashboard to JSON using curl
KEY=XXXXXXXXXXXX
HOST="https://metrics.crisidev.org"
mkdir -p dashboards && for dash in $(curl -k -H "Authorization: Bearer $KEY" $HOST/api/search\?query\=\& |tr ']' '\n' |cut -d "," -f 5 |grep slug |cut -d\" -f 4); do
curl -k -H "Authorization: Bearer $KEY" $HOST/api/dashboards/db/$dash > dashboards/$dash.json
done
@jboner
jboner / latency.txt
Last active October 26, 2025 02:11
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