Michael Finocchiaro. This white paper presents the basics of Java Performance
Tuning for large Application Servers. Summer 08. Java Performance Tuning ...
Use various tools and mechanisms for monitoring, profiling and tuning Java applications. Apply best practices for perfor
Jan 9, 2013 ... Version 10.8 Tuning Java DB i. Contents. Copyright. ... Performance tips and
tricks. .... Performance and optimization.
Sun Java System Web Server 6.1. SP12 Performance Tuning,. Sizing, and
Scaling Guide. Sun Microsystems, Inc. 4150 Network Circle. Santa Clara, CA
95054.
java performance tuning 2nd edition pdf download. java performance tuning 2nd edition pdf download. Open. Extract. Open
Honda Accord EX-L V-6 Coupe. Honda ... 1998 Honda Marine is the only marine
engine manufacturer offering over .... O2/LAF and Knock Sensors EXCLUSIVE.
Abstract. This paper presents an in-depth Design of Experiments. (DOE) methodology for the performance analysis of a stochastic heuris- tic. The heuristic under ...
than 16 · N2, we observe that the leading point in the stencil A[i,j+1] will eventually be .... formance bound based on the Roofline at said X-coordinate. Thus ...
Jul 7, 2015 - Sensitizers for Dye-Sensitized Solar Cells: A Joint Experimental and ... as an alternate renewable energy source due to the promising.
ETL Performance Tuning Tips .... Tips for Sizing Input Data to an ETL Flow . .....
Simple Tuning of ETL Flows Results in Immediate Gains.
The server refuses to start after a change: did you use the correct unit? ..... innodb_buffer_pool_size â if you have
emitted a blue haze from their tailpipes too, which appeared unsightly, long ..... To check that the machine shop recuts
Jul 7, 2015 - Theoretical Study of the Influence of ÏâSpacers. Mahalingavelar Paramasivam,. â ,â¡. Ramesh Kumar Chitumalla,. â . Surya Prakash Singh,. â .
Bonn Boston www.sap-press.com .... Contents. 3.3.8 Performance Trace —
SQL Trace (Transaction ST05) ........ 57 ... 3.4 Tips for the Performance Analysis .
Performance Tuning for the JDBCTM API. What Works, What Doesn't, and Why.
Mark Chamness. Sr. Java Engineer. Cacheware ...
databene GmbH in Gründung. Software Architect. & Performance Engineer.
JBoss User Group München. 2. April 2009. Hibernate. Performance Tuning ...
Kawasaki and Honda in the past (FIGURE 3.9). This type of port has very little
going for it as the sudden change in shape above the main transfers is very harsh
...
Jul 4, 2010 - remaindering can just be a plug-in in any integer computa- tion. We also ...... in a cheater homotopy for the cyclic 7-roots problem [4]. Although ...
Aug 26, 2013 - 4.4.1 Determine The Optimum Number of Interrupt Service CPUs . .... dimensions: Upon receiving data from
Kawasaki and Honda in the past (FIGURE 3.9). This type of port has very little
going for it as the sudden change in shape above the main transfers is very harsh
...
Overview. • What to look for in tuning. • How it relates to the graphics pipeline. •
Modern areas of interest. – Vertex Buffer Objects. – Shader performance ...
Apr 26, 2012 - Brought up the Global Database Group at Starwood Hotels, in White Plains, NY. ⢠Blog: arup.blogspot.com
Java-based version of my 1995 textbook The Art and Science of C. My hope is
that I can ..... programming language Java—a language developed by Sun
Microsystems ... are examples of what computer scientists call higher-level
languages.
Aug 7, 2012 ... Extreme (WLS/Java) Performance Workshop. WebLogic Server Performance
Tuning. Jonathan Leung. FMW APAC Performance Specialist.
May 14, 2013 ... Java Performance is Complex. • Write once run everywhere. – Java is slow
because it's interpreted. • No, there are Just In Time (JIT) compilers.
Where Does That Leave You? • Don’t worry • Be happy • Write sloppy code and place blame elsewhere – Java – The hardware – The platform – JVM – Poor tools 14/05/2013
Loop Invariants • Don’t do something in a loop you that can do outside the loop public NamedElement find(NamedElement namedElement){ for (NamedElement otherNamedElement : getNamedElements()) { if (namedElement.getName().equals(otherNamedElement.getName())) { return otherNamedElement; } } return null; }
Generics Hide Casting • Java 5 hides things in the source, but it doesn’t make that free at runtime public NamedElement find(NamedElement namedElement) { String name = namedElement.getName(); for (NamedElement otherNamedElement : getNamedElements()) { if (name.equals(otherNamedElement.getName())) { return otherNamedElement; } } return null; }
• Not just the casting is hidden but the iterator too 14/05/2013
Overriding Generic Methods • Overriding a generic method often results in calls through a bridge method – That bridge method does casting which isn’t free new HashMap() { @Override public Object put(String key, Object value) { return super.put(key == null ? null : key.intern(), value); } };
Accessing Private Fields • Accessing a private field of another class implies a method call public static class Context { private class Point { private int x; private int y; }
}
public void compute() { Point point = new Point(); point.x = 10; point.y = 10; }
External Measurements • Profiling – Tracing • Each and every (unfiltered) call in the process is carefully tracked and recorded • Detailed counts and times, but is slow, and intrusive, and doesn’t reliably reflect non-profiled performance
– Sampling • The running process is periodically sampled to give a statistical estimate of where the time is being spent • Fast and unintrusive, but unreliable beyond hot spot identification 14/05/2013
Micro Benchmarks • Measuring small bits of logic to draw conclusions about which approach performs best – These are fraught with problems – The same JIT will produce very different results in isolation from what it does in real life – The hardware may produce very different results in isolation from what it does in a real application – You simply can’t measure threading reliably 14/05/2013
Micro Benchmarks • The JIT will turn your code into a very cheap no-op – Your benchmark must compute a result visible to the harness
• Because the clocks are inaccurate you must execute for a long time – That typically implies doing something in a loop and then of course you’re measuring the loop overhead too 14/05/2013
Micro Benchmarks • Do as much as possible outside the benchmark and outside the loop • You want to know the performance of the compiled code, not the interpreted code – You need a warmup • Use -XX:+PrintCompilation
Micro Measurements • I wrote a small benchmark harness – http://git.eclipse.org/c/emf/org.eclipse.emf.git/tree/tests/org.eclipse. emf.test.core/src/org/eclipse/emf/test/core/BenchmarkHarness.java
– Write a class that extends Benchmark and implements run – The harness runs the benchmark to determine many times it must run to use approximately a minimum of one second – Then it runs it repeatedly, gathering statistics 14/05/2013
The Simplest Micro Measurement • This is the simplest thing you can measure public static class CountedLoop extends Benchmark { public CountedLoop() { super(1000000); } @Override
public int run() { int total = 0; for (int i = 0; i < count; ++i) { total += i; } return total; }
@Override
}
public String getLogic() { return "total += i;"; }
