Re: Speed of C++ compared with speed of other languages (was: Exception Misconceptions: Exceptions are for unrecoverable errors.)

From:

tanix@mongo.net (tanix)

Newsgroups:

comp.lang.c++

Date:

Thu, 24 Dec 2009 19:25:06 GMT

Message-ID:

<hh0f6h$pko$1@news.eternal-september.org>

In article <Java-performance-20091224141824@ram.dialup.fu-berlin.de>, ram@zedat.fu-berlin.de (Stefan Ram) wrote:

Branimir Maksimovic <bmaxa@hotmail.com> writes:

Refcounts are negligible in comparison to what gc is doing.
GC cannot be efficient since it cannot access program

     ?[A]llocation in modern JVMs is far faster than the best
     performing malloc implementations. The common code path
     for new Object() in HotSpot 1.4.2 and later is
     approximately 10 machine instructions (data provided by
     Sun; see Resources), whereas the best performing malloc
     implementations in C require on average between 60 and 100
     instructions per call (Detlefs, et. al.; see Resources).
     And allocation performance is not a trivial component of
     overall performance -- benchmarks show that many
     real-world C and C++ programs, such as Perl and
     Ghostscript, spend 20 to 30 percent of their total
     execution time in malloc and free -- far more than the
     allocation and garbage collection overhead of a healthy
     Java application (Zorn; see Resources).?

http://www-128.ibm.com/developerworks/java/library/j-jtp09275.html?ca=dgr-jw22J
avaUrbanLegends

Good read.

I don;t want to discuss this, but it is obvious that nothing in java is
designed with performance in mind. Quite opposite....

This is just an insult and not only an insult to intelligence
of those, who designed the language, but total fiction.

Java 1.6 (aka ?Java 6?) is already one of the fastest languages:

http://shootout.alioth.debian.org/gp4/benchmark.php?test=all&lang=all

Yep, that is what I suspected.

And Java 1.7 (aka ?Java 7?) is reported to be even faster:

?Java 5 <=== 18% faster=== < Java 6 < ===46% faster===< Java 7?

http://www.taranfx.com/blog/java-7-whats-new-performance-benchmark-1-5-1-6-1-7

Cool. I like that. Helps me quite a bit.

See also:

http://www.stefankrause.net/wp/?p=9

http://paulbuchheit.blogspot.com/2007/06/java-is-faster-than-c.html

http://www.idiom.com/~zilla/Computer/javaCbenchmark.html

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