Xmx limited to 500m on JRuby 9.3.x with 2.x

Description

I've observed that jruby-launcher 2.0.1 is causing installations of JRuby 9.3.x.x to be limited to 500 MB of heap. This cannot be overridden with JAVA_OPTS or JRUBY_OPTS. Attempting to do wso will result in a ps aux like:

seanstory        70590   0.0  0.4 413864832 246672 s001  S+   12:51PM   0:04.51 java -Xmx1g -client -Xmx500m -Xss2048k -Djffi.boot.library.path=/opt/homebrew/Cellar/rbenv/1.3.2/versions/jruby-9.3.15.0/lib/jni -Dfile.encoding=UTF-8 -Xbootclasspath/a:/opt/homebrew/Cellar/rbenv/1.3.2/versions/jruby-9.3.15.0/lib/jruby.jar -classpath : -Djruby.home=/opt/homebrew/Cellar/rbenv/1.3.2/versions/jruby-9.3.15.0 -Djruby.lib=/opt/homebrew/Cellar/rbenv/1.3.2/versions/jruby-9.3.15.0/lib -Djruby.script=jruby -Djruby.shell=/bin/sh org.jruby.Main /opt/homebrew/opt/rbenv/versions/jruby-9.3.15.0/bin/irb

Note both the -Xmx1g (expected) and the -Xmx500m (unexpected).

This does not appear to be an issue with JRuby versions 9.4.x.x.

I found a reference to 500m here: https://github.com/jruby/jruby/blob/0db23ddd14b02c90f37c9161b0ca76aee57c6b35/bin/jruby.sh#L113-L115 which is present in the jruby.sh files in 9.3.x.x. I expect therefore that this bug is related to rbenv/ruby-build#2517

Reproduction Steps

brew install rbenv
rbenv install jruby-9.3.14.0
create a file, test.rb, with contents puts Java::JavaLangManagement::ManagementFactory.memory_mx_bean.heap_memory_usage.max / 1024 / 1024
run JAVA_OPTS="-Xmx1g" ruby test.rb, and see output ~500
install instead jruby-9.4.12.0
execute JAVA_OPTS="-Xmx1g" ruby test.rb, see expected default output of ~1024

Workarounds

uninstall jruby-launcher: gem uninstall jruby-launcher
replace jruby-launcher with an older verion: gem uninstall jruby-launcher -v 2.0.1 && gem install jruby-launcher -v 1.1.19
set heap instead with JAVA_MEM environment variable: export JAVA_MEM="-Xmx=1g"

@mrnoname1000

@mrnoname1000 maybe you can help me look into this? It's either an issue with the new native launcher or the shell script.

@seanstory

@seanstory Have not been able to reproduce outside of rbenv with the same script. Could you provide the output of jruby --environment with you env and setup?

heh. This is fun.

Seans-MacBook-Pro:ent-search seanstory$ jruby --environment
jruby: unknown option --environment
Seans-MacBook-Pro:ent-search seanstory$ jruby --version
jruby 9.3.14.0 (2.6.8) 2024-02-20 0db23ddd14 OpenJDK 64-Bit Server VM 11.0.25+9 on 11.0.25+9 +jit [arm64-darwin]
Seans-MacBook-Pro:ent-search seanstory$ which jruby
/opt/homebrew/opt/rbenv/shims/jruby
Seans-MacBook-Pro:ent-search seanstory$ jruby -h
Usage: jruby [switches] [--] [programfile] [arguments]
  -0[octal]         specify record separator (\0, if no argument)
  -a                autosplit mode with -n or -p (splits $_ into $F)
  -c                check syntax only
  -Cdirectory       cd to directory, before executing your script
  -d                set debugging flags (set $DEBUG to true)
  -e 'command'      one line of script. Several -e's allowed. Omit [programfile]
  -Eex[:in]         specify the default external and internal character encodings
  -Fpattern         split() pattern for autosplit (-a)
  -G                load a Bundler Gemspec before executing any user code
  -i[extension]     edit ARGV files in place (make backup if extension supplied)
  -Idirectory       specify $LOAD_PATH directory (may be used more than once)
  -J[java option]   pass an option on to the JVM (e.g. -J-Xmx512m)
                      use --properties to list JRuby properties
                      run 'java -help' for a list of other Java options
  -l                enable line ending processing
  -n                assume 'while gets(); ... end' loop around your script
  -p                assume loop like -n but print line also like sed
  -rlibrary         require the library, before executing your script
  -s                enable some switch parsing for switches after script name
  -S                look for the script in bin or using PATH environment variable
  -T[level]         turn on tainting checks
  -U                use UTF-8 as default internal encoding
  -v                print version number, then turn on verbose mode
  -w                turn warnings on for your script
  -W[level]         set warning level; 0=silence, 1=medium, 2=verbose (default)
  -x[directory]     strip off text before #!ruby line and perhaps cd to directory
  -X[option]        enable extended option (omit option to list)
  -y                enable parsing debug output
  --copyright       print the copyright
  --debug           sets the execution mode most suitable for debugger
                      functionality
  --jdb             runs JRuby process under JDB
  --properties      List all configuration Java properties
                      (prepend "jruby." when passing directly to Java)
  --environment     Log environment and command line flags but do not run JRuby
  --sample          run with profiling using the JVM's sampling profiler
  --profile         run with instrumented (timed) profiling, flat format
  --profile.api     activate Ruby profiler API
  --profile.flat    synonym for --profile
  --profile.graph   run with instrumented (timed) profiling, graph format
  --profile.html    run with instrumented (timed) profiling, graph format in HTML
  --profile.json    run with instrumented (timed) profiling, graph format in JSON
  --profile.out     [file]
  --profile.service <ProfilingService implementation classname>
                    output profile data to [file]
  --client          use the non-optimizing "client" JVM
                      (improves startup; default)
  --server          use the optimizing "server" JVM (improves perf)
  --headless        do not launch a GUI window, no matter what
  --dev             prioritize startup time over long term performance
  --manage          enable remote JMX management and monitoring of JVM and JRuby
  --bytecode        show the JVM bytecode produced by compiling specified code
  --version         print the version
  --disable-gems    do not load RubyGems on startup
  --enable=feature[,...], --disable=feature[,...]
                    enable or disable features
Features:
  gems                   rubygems (default: enabled)
  did_you_mean           did_you_mean (default: enabled)
  rubyopt                RUBYOPT environment variable (default: enabled)
  frozen-string-literal  freeze all string literals (default: disabled)
Seans-MacBook-Pro:ent-search seanstory$

Trying to provide any extra info

`gems list`

Seans-MacBook-Pro:ent-search seanstory$ gem list

*** LOCAL GEMS ***

bundler (default: 2.2.33)
cmath (default: 1.0.0)
csv (default: 3.2.5)
did_you_mean (1.3.0)
e2mmap (default: 0.1.0)
ffi (default: 1.15.4 java)
fileutils (default: 1.4.1)
forwardable (default: 1.2.0)
io-console (default: 0.5.9 java)
ipaddr (default: 1.2.2)
irb (default: 1.0.0)
jar-dependencies (default: 0.4.1)
jruby-launcher (2.0.1 java)
jruby-openssl (default: 0.14.2 java)
jruby-readline (default: 1.3.7 java)
json (default: 2.5.1 java)
logger (default: 1.5.1)
matrix (default: 0.3.0)
minitest (5.11.3)
mutex_m (default: 0.1.0)
net-telnet (0.1.1)
ostruct (default: 0.5.5)
power_assert (1.1.3)
prime (default: 0.1.0)
psych (default: 3.3.4 java)
racc (default: 1.5.2 java)
rake (12.3.3)
rake-ant (default: 1.0.4)
rdoc (default: 6.3.3)
rexml (default: 3.2.5)
rss (default: 0.2.7)
rubygems-update (default: 3.2.33)
scanf (default: 1.0.0)
shell (default: 0.7)
sync (default: 0.5.0)
test-unit (3.2.9)
thwait (default: 0.1.0)
tracer (default: 0.1.0)
webrick (default: 1.7.0)
xmlrpc (0.3.0)

`env` (secure bits removed)

Seans-MacBook-Pro:ent-search seanstory$ env
NVM_INC=/Users/seanstory/.nvm/versions/node/v16.19.1/include/node
TERM_PROGRAM=Apple_Terminal
NVM_CD_FLAGS=
PYENV_ROOT=/Users/seanstory/.pyenv
TERM=xterm-256color
SHELL=/bin/bash
HOMEBREW_REPOSITORY=/opt/homebrew
TMPDIR=/var/folders/2t/bkqn7m1j7j3fcrwrxblms92r0000gn/T/
TERM_PROGRAM_VERSION=455.1
TERM_SESSION_ID=7559AB27-E76D-4E74-A67A-E369B989C038
NVM_DIR=/Users/seanstory/.nvm
USER=seanstory
RBENV_ROOT=/opt/homebrew/opt/rbenv
MAVEN_OPTS=-Xmx3g
LSCOLORS=exfxcxdxbxegedabagacad
PATH=/Users/seanstory/.asdf/shims/:/opt/homebrew/opt/curl/bin:/Users/seanstory/.jenv/shims:/Users/seanstory/.jenv/bin:/Users/seanstory/.nvm/versions/node/v16.19.1/bin:/Users/seanstory/.cargo/bin:/Users/seanstory/.pyenv/shims:/opt/homebrew/opt/rbenv/shims:/opt/homebrew/opt/rbenv/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/Users/seanstory/bin
LaunchInstanceID=EC3B42AB-95A6-48B7-A82D-1B7EAB935C40
__CFBundleIdentifier=com.apple.Terminal
JENV_LOADED=1
PWD=/Users/seanstory/Desktop/Dev/ent-search
LANG=en_US.UTF-8
XPC_FLAGS=0x0
RBENV_SHELL=bash
XPC_SERVICE_NAME=0
PYENV_SHELL=bash
HOME=/Users/seanstory
SHLVL=1
HOMEBREW_PREFIX=/opt/homebrew
LOGNAME=seanstory
JENV_SHELL=bash
NVM_BIN=/Users/seanstory/.nvm/versions/node/v16.19.1/bin
INFOPATH=/opt/homebrew/share/info:
HOMEBREW_CELLAR=/opt/homebrew/Cellar
_=/usr/bin/env

fwiw, I can reproduce from a clean environment with just a few steps of:

brew install rbenv
rbenv install jruby-9.3.14.0
rbenv local jruby-9.3.14.0

echo '#! /bin/ruby
puts Java::JavaLangManagement::ManagementFactory.memory_mx_bean.heap_memory_usage.max / 1024 / 1024' > test.rb

JAVA_OPTS="-Xmx1g" ruby test.rb

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Xmx limited to 500m on JRuby 9.3.x with 2.x #52

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Xmx limited to 500m on JRuby 9.3.x with 2.x #52

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headius commented on Apr 22, 2025

headius commented on Apr 23, 2025

seanstory commented on Apr 25, 2025

seanstory commented on Apr 25, 2025

seanstory commented on Apr 25, 2025

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