【徹底討論】Java３Dの可能性について考える

【徹底討論】Java３Dの可能性について考える at TECH

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550:デフォルトの名無しさん
 04/10/17 23:23:18
 高速フーリエ変換もなぜかCを抜いて 
IBM製Java VMが高速

551:デフォルトの名無しさん
 04/10/17 23:25:09
Conclusions: Why is "Java is Slow" so Popular? 
Java is now nearly equal to (or faster than) C++ on low-level and numeric benchmarks.  
This should not be surprising: Java is a compiled language (albeit JIT compiled). 
 
Nevertheless, the idea that "java is slow" is widely believed. Why this is so is perhaps  
the most interesting aspect of this article. 
 
Let's look at several possible reasons:  
 
# Java circa 1995 was slow. The first incarnations of java did not java a JIT compiler,  
and hence were bytecode interpreted (like Python for example). JIT compilers appeared  
in JVMs from Microsoft, Symantec, and in Sun's java1.2. 
 
This explanation is implausible. Most "computer folk" are able to rattle off the exact speed  
in GHz of the latest processors, and they track this information as it changes each month  
(and have done so for years). Yet this explanation asks us to believe that they are not able to  
remember that a single and rather important language speed change occurred in 1996. 
# Java can be slow still. For example, programs written with the thread-safe Vector class are  
necessarily slower (on a single processor at least) than those written with the equivalent thread-unsafe ArrayList class.

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