Performance degradation on write operations
--------------------------------------------
Key: JRUBY-3242
URL: http://jira.codehaus.org/browse/JRUBY-3242
Project: JRuby
Issue Type: Bug
Components: Performance
Affects Versions: JRuby 1.1.5, JRuby 1.1.4
Environment: solaris x86
Reporter: Eileen Loh
Rails application performance degrades with time. The degradation is
especially pronounced on database write operations. Preliminary profiles seem
to indicate that ConcurrentHashmap.lookup() may be an issue as well as jruby
method lookups.
Functions sorted by metric: Exclusive User CPU Time
Excl. Incl. Name
User CPU User CPU
sec. sec.
127.599 127.599 <Total>
8.016 8.826
java.util.concurrent.ConcurrentHashMap$Segment.get(java.lang.Object, int)
7.195 7.195 vtable stub
6.465 21.765 org.jruby.RubyModule.cacheHit(java.lang.String)
6.354 8.946
org.jruby.RubyString.op_equal(org.jruby.runtime.ThreadContext,
org.jruby.runtime.builtin.IRubyObject)
4.483 16.842
java.util.concurrent.ConcurrentHashMap.get(java.lang.Object)
4.173 4.173 org.jruby.RubyBasicObject.isTrue()
3.993 43.881
org.jruby.javasupport.util.RuntimeHelpers.invoke(org.jruby.runtime.ThreadContext,
org.jruby.runtime.builtin.IRubyObject, java.lang.String,
org.jruby.runtime.builtin.IRubyObject)
3.883 39.778
org.jruby.RubyClass.finvoke(org.jruby.runtime.ThreadContext,
org.jruby.runtime.builtin.IRubyObject, java.lang.String,
org.jruby.runtime.builtin.IRubyObject)
3.522 3.522 java.util.concurrent.ConcurrentHashMap.segmentFor(int)
3.022 49.154
org.jruby.RubyObject.equalInternal(org.jruby.runtime.ThreadContext,
org.jruby.runtime.builtin.IRubyObject, org.jruby.runtime.builtin.IRubyObject)
2.612 4.403
java.util.concurrent.ConcurrentHashMap.get(java.lang.Object)
2.582 11.428
org.jruby.RubyString$i_method_1_0$RUBYINVOKER$op_equal.call(org.jruby.runtime.ThreadContext,
org.jruby.runtime.builtin.IRubyObject, org.jruby.RubyModule, java.lang.String,
org.jruby.runtime.builtin.IRubyObject)
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