how/where to set --profile.api option for jruby running inside jruby-rack/tomcat?

how/where 开发者_如何学Cto set --profile.api option for jruby running inside jruby-rack/tomcat?

This option is documented in how to profile a block of code here

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using JRUBY_OPTS won't work due how JRuby profiling is implemented - it only supported profiling a single "main" runtime ... now I was actually trying to make it work with an arbitrary runtime and my code got merged into 1.7 https://github.com/jruby/jruby/pull/96 but it still might require testing and work to be done.

for the record there's also a context paramater for setting arguments (command-line style) when using JRuby-Rack, thus if you had a JRuby version that can profile any runtime you will need to add the following code :

<context-param>
  <param-name>jruby.runtime.arguments</param-name>
  <param-value>--profile.api</param-value>
</context-param>

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add to $JRUBY_OPTS

Example:

JRUBY_OPTS="--profile.api"