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- all benchmarks - binary-trees chameneos-redux fannkuch fasta k-nucleotide mandelbrot meteor-contest n-body pidigits regex-dna reverse-complement spectral-norm thread-ring - all languages - Ada 2005 GNAT ATS C GNU gcc C# Mono C++ GNU g++ Erlang HiPE F# Mono Fortran Intel Go 6g 8g Haskell GHC Java 6 -server Java 6 -Xint Java 6 steady state Lisp SBCL OCaml Pascal Free Pascal Perl PHP Python 3 Python CPython Ruby JRuby Scala

÷ Ada 2005 GNAT ATS C GNU gcc C# Mono C++ GNU g++ Erlang HiPE F# Mono Fortran Intel Go 6g 8g Haskell GHC Java 6 -server Java 6 -Xint Java 6 steady state Lisp SBCL OCaml Pascal Free Pascal Perl PHP Python 3 Python CPython Ruby JRuby Scala

 Step 1 : Are the Java 6 -server programs faster? At a glance.

This chart shows 3 comparisons - Time-used, Memory-used and Code-used ~ speed and size.

Each chart bar shows, for one unidentified benchmark, how much the fastest Java 6 -server program used compared to the fastest Python CPython program.

 Step 2 : Are the Java 6 -server programs faster? Approximately.

This table shows 3 comparisons - Time-used, Memory-used and Code-used ~ speed and size.

Each table row shows, for one named benchmark, how much the fastest Java 6 -server program used compared to the fastest Python CPython program.

Java 6 -server used what fraction? used how many times more?
Benchmark	Time	Memory	Code
fannkuch	1/180	5×	3×
mandelbrot	1/62	2×	2×
n-body	1/61	4×	±
spectral-norm	1/60	1/2	2×
chameneos-redux	1/31	4×	2×
fasta	1/27	4×	2×
binary-trees	1/24	±	±
k-nucleotide	1/6	±	3×
reverse-complement	1/2	±	2×
regex-dna	±	4×	3×
pidigits	±	67×	2×

± read the measurements and then read the program source code.

 Step 3 : Are the Java 6 -server programs faster? Measurements.

This table shows 5 measurements - CPU Time, Elapsed Time, Memory, Code and ≈ CPU Load ~ speed and size.

For each named benchmark, measurements of the fastest Java 6 -server program are shown for comparison against measurements of the fastest Python CPython program.

Program Source Code	CPU secs	Elapsed secs	Memory KB	Code B	≈ CPU Load
fannkuch
Java 6 -server	65.43	17.94	13,940	1150	99% 99% 99% 68%
Python CPython	3,232.09	3,231.90	2,852	387	36% 8% 48% 7%
mandelbrot
Java 6 -server	45.21	11.54	44,768	903	98% 98% 98% 99%
Python CPython	2,882.02	720.54	23,468	425	100% 100% 100% 100%
n-body
Java 6 -server	23.70	23.74	12,608	1424	0% 100% 0% 0%
Python CPython	1,443.10	1,443.02	2,932	1105	86% 7% 1% 7%
spectral-norm
Java 6 -server	15.93	4.07	12,736	950	97% 100% 98% 97%
Python CPython	942.71	242.94	23,632	428	98% 97% 98% 95%
chameneos-redux
Java 6 -server	13.67	5.82	12,952	1377	59% 50% 54% 60%
Python CPython	237.86	180.72	3,024	869	43% 32% 29% 27%
fasta
Java 6 -server	7.75	7.72	12,808	1240	1% 100% 0% 1%
Python CPython	208.55	208.54	2,928	779	61% 23% 4% 12%
binary-trees
Java 6 -server	14.13	11.68	460,636	603	28% 24% 55% 14%
Python CPython	980.23	279.06	674,024	626	86% 89% 85% 90%
k-nucleotide
Java 6 -server	46.28	13.60	476,316	1602	86% 92% 81% 81%
Python CPython	277.72	84.94	441,680	519	54% 94% 82% 96%
reverse-complement
Java 6 -server	3.38	3.32	473,716	592	0% 2% 1% 98%
Python CPython	6.78	6.78	561,860	288	0% 40% 61% 0%
regex-dna
Java 6 -server	29.50	11.81	694,708	929	87% 54% 54% 55%
Python CPython	11.73	11.73	196,492	314	0% 0% 100% 0%
pidigits
Java 6 -server	59.18	58.03	240,912	800	34% 23% 31% 14%
Python CPython	54.74	54.74	3,596	407	100% 0% 0% 0%

 Step 4 : Are there other Java 6 -server programs for these benchmarks?

Remember - those are just the fastest Java 6 -server and Python CPython programs measured on this OS/machine. Check if there are other implementations of these benchmark programs for Java 6 -server.

Ada 2005 GNAT ATS C GNU gcc C# Mono C++ GNU g++ Erlang HiPE F# Mono Fortran Intel Go 6g 8g Haskell GHC Java 6 -server Java 6 -Xint Java 6 steady state Lisp SBCL OCaml Pascal Free Pascal Perl PHP Python 3 Python CPython Ruby JRuby Scala

Maybe one of those other Java 6 -server programs is fastest on a different OS/machine.

 Step 5 : Are there other faster programs for these benchmarks?

Remember - those are just the fastest Java 6 -server and Python CPython programs measured on this OS/machine. Check if there are faster implementations of these benchmark programs for other programming languages.

binary-trees chameneos-redux fannkuch fasta k-nucleotide mandelbrot meteor-contest n-body pidigits regex-dna reverse-complement spectral-norm thread-ring

Maybe one of those other programs is fastest on a different OS/machine.

 Java 6 -server : ubiquitous jit server virtual machine 

java version "1.6.0_18"
Java(TM) SE Runtime Environment (build 1.6.0_18-b07)
Java HotSpot(TM) Server VM (build 16.0-b13, mixed mode)

Home Page: http://java.sun.com/j2se/

Download: http://java.sun.com/j2se/downloads/

"Remember how HotSpot works. It starts by running your program with an interpreter. When it discovers that some method is "hot" -- that is, executed a lot, either because it is called a lot or because it contains loops that loop a lot -- it sends that method off to be compiled. After that one of two things will happen, either the next time the method is called the compiled version will be invoked (instead of the interpreted version) or the currently long running loop will be replaced, while still running, with the compiled method. The latter is known as "on stack replacement" and exists in the 1.3/1.4 HotSpot based systems."

Benchmarking the Java HotSpot VM

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