Limit JIT tiering for one-shot CLI subcommands#432
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The gem, irb, and ruby subcommands boot a full JVM per invocation but
live only seconds. Their JRuby already runs with compile-mode :off (the
jruby-utils default, shared with the server pools), but the JVM itself
was untuned: ezbake's :java-args-cli defaults to an empty string, so
these one-shot processes paid full C2 JIT warm-up.
Set -XX:TieredStopAtLevel=1 as the packaged default for JAVA_ARGS_CLI.
Measured on an installed 4-core server with 'puppetserver gem list':
wall clock: 3.00s -> 2.48s (~17% faster)
CPU time: 7.34s -> 4.11s (~44% less)
max RSS: 420MB -> 298MB (~29% less)
The service path (JAVA_ARGS) is untouched and keeps full JIT. Operators
can still override JAVA_ARGS_CLI in the service defaults file, since
ezbake renders it as ${JAVA_ARGS_CLI:-<default>}. The ca and prune
subcommands run under the agent's MRI Ruby and are unaffected.
Suggested by @Sharpie in review of openvox-server#427.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Signed-off-by: Steven Pritchard <steven.pritchard@gmail.com>
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Pull Request (PR) description
The gem, irb, and ruby subcommands boot a full JVM per invocation but live only seconds. Their JRuby already runs with compile-mode :off (the jruby-utils default, shared with the server pools), but the JVM itself was untuned: ezbake's :java-args-cli defaults to an empty string, so these one-shot processes paid full C2 JIT warm-up.
Set -XX:TieredStopAtLevel=1 as the packaged default for JAVA_ARGS_CLI. Measured on an installed 4-core server with 'puppetserver gem list':
wall clock: 3.00s -> 2.48s (~17% faster)
CPU time: 7.34s -> 4.11s (~44% less)
max RSS: 420MB -> 298MB (~29% less)
The service path (JAVA_ARGS) is untouched and keeps full JIT. Operators can still override JAVA_ARGS_CLI in the service defaults file, since ezbake renders it as ${JAVA_ARGS_CLI:-}. The ca and prune subcommands run under the agent's MRI Ruby and are unaffected.
Suggested by @Sharpie in review of openvox-server#427.
Code generated by Claude Code.
This Pull Request (PR) fixes the following issues
N/A