jjb

sudo -u postgres pg_ctl -D /opt/local/var/db/postgresql12/defaultdb stop
sudo -u postgres pg_ctl -D /opt/local/var/db/postgresql12/defaultdb start

jjb

sudo port unload postgresql12-server
sudo port load postgresql12-server

jjb

raw = Rails.cache.redis.get( Rails.cache.redis.keys.first)
Marshal.load raw
Marshal.load(raw).instance_variable_get :@value
Zlib::Inflate.inflate Marshal.load(raw).instance_variable_get :@value



Marshal.load Zlib::Inflate.inflate Marshal.load(raw).instance_variable_get :@value

jjb

require 'socket'
Socket.tcp("example.com", 443, connect_timeout: 1).close

jjb

example program being monitored - sleep.sh

while [ 1 ]
do
  sleep 1
  echo hello
done

jjb

• runner does not use executor in <7, does use it in >=7
• console does not use executor in <7, not sure about >=7

jjb

1. hello
2. hello
   1. nested
   2. nested
      1. more
      2. more
         1. and again

            puts "hello"

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invoke with bin/jemalloc rails s

We weren’t using 3 before, but have been running 5 in prod for ~10 months now, we saw ~25% less memory usage compared to default malloc

see also https://gist.github.com/jjb/9ff0d3f622c8bbe904fe7a82e35152fc

jjb

For years, people have been using jemalloc with ruby. There were various benchmarks and discussions. Legend had it that Jemalloc 5 didn't work as well as Jemalloc 3.

Then, one day, hope appeared on the horizon. @wjordan offered a config for Jemalloc 5.

Ubuntu/Debian

FROM ruby:3.1.2-bullseye
RUN apt-get update ; \

jjb

old=`pbpaste`
`echo '#{ENV['THE_TEXT']}' | pbcopy`
3.downto(0) do |second|
  `osascript -e 'display notification "Reseting clipboard in #{second} seconds" with title "TMP Clipboard"'`
  sleep 1
end
`echo '#{old}' | pbcopy`