bdha

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superjamie

The 8-Byte Two-Step Redux

This post has migrated to:

https://superjamie.github.io/2014/09/21/the-8-byte-two-step-redux

slfritchie

Purpose: To prevent scheduler collapse by disabling scheduler sleep periods.
This patch is relative to R16B01 pre-release but may be applied (with "fuzz")
on R15B01 and R15B03-1 without difficulty.

The new flag, "+zdss", must be used with "+scl false" flag to be successful.
See the erl.xml document for a description.  Example use:

  erl +scl false +zdss 500:500

Note that this flag used to be called "+zdnfgtse"

kevsmith

-module(bench).

-export([run_suite/3, run/1]).

run_suite(Name, Passes, Messages) ->
    Results = run_suite1(Passes, Messages, []),
    Avg = lists:sum(Results) / Passes,
    StdDev = math:sqrt(lists:sum([math:pow(X - Avg, 2) || X <- Results]) / Passes),
    Summary = [{avg, Avg}, {stddev, StdDev}, {min, lists:min(Results)},
               {max, lists:max(Results)}],

vinoski

When you build Erlang/OTP on OS X, it unfortunately defaults to handling a maximum of 1024 file descriptors. You can get around this limitation with the right combination of configuration options and manual changes to a generated config file.

First, go into your unpacked Erlang/OTP source directory and run the following command, replacing the value 10000 with whatever value you want for max file descriptors:

perl -i -pe 's/(define\s+FD_SETSIZE\s+)\d+/\1 10000/' erts/config.h.in 

Next, when you run configure in your Erlang/OTP source directory, be sure to include the right CFLAGS setting, as shown below:

CFLAGS='-DREDEFINE_FD_SETSIZE -DFD_SETSIZE=15000 -D_DARWIN_UNLIMITED_SELECT' ./configure --enable-kernel-poll <other options>

amitchhajer

git ls-files -z | xargs -0n1 git blame -w | perl -n -e '/^.*\((.*?)\s*[\d]{4}/; print $1,"\n"' | sort -f | uniq -c | sort -n

serby

projdel node
projadd -c "node settings" -U admin -G staff -K "process.max-file-descriptor=(basic,65535,deny)" node


svccfg -s node-nodestack-service setprop 'method_context/project=node'
svcadm disable node-nodestack-service
svcadm enable node-nodestack-service

pgrep node

ferd

%%% Run with 'escript app_deps.erl'
%%% Change the path in filelib:wildcard/1 as required to capture all
%%% your dependencies.
%%%
%%% Rectangular nodes will represent library apps (no processes involved)
%%% and the circular nodes will represent regular apps. An arrow going from
%%% 'A -> B' means 'A depends on B'.
%%%
%%% This script depends on graphviz being present on the system.
-module(app_deps).

reiddraper

on the guest SmartOS VM

pkg_add http://pkgsrc.joyent.com/sdc6/2012Q1/i386/All/smtools
# note this is going to shut down the VM
sm-prepare-image

on the global zone

reiddraper

I've been playing more with this Erlang factoring technique. As an exercise, I've been trying to force myself to adopt the method, by writing functions that are 3 or less lines long (function clauses actually, so multiple pattern-matched claues are OK).

Death to receive expressions

One place I noticed was causing myself