Re: Does the Java compiler with Suns JDK supports multiprocessors in Linux

[Thomas Eichberger <we...@java.at>]

On Windows javac uses definitely only one processor.

Ciao

Thomas



At 05:40 30.01.2002 -0500, Sean Owen wrote:
>Yeah, I don't believe javac will benefit from multiple processors. 
>However, you can still take advantage of multiple processors, maybe, if 
>you can split up your compilation into two or more independent, parallel 
>compiles.
>
>For example I've organized my code on a J2EE project into three groups: 
>code for the web application, code for the EJBs, and code used by both 
>(common). Once the common code is compiled, the web app and EJBs can both 
>be compiled, but neither of the two depends on the other.
>
>So, you can use Ant's "parallel" tag to make the web app and EJB 
>compilation targets run in parallel, which will use two processors. The 
>Ant output gets mixed up, but it's not a big deal.
>
>Also, installing and using the jikes Java compiler will speed up your 
>compilation significantly.
>
>Sean
>
>
>On Tuesday, January 29, 2002, at 04:39  AM, Thorbjørn Ravn Andersen wrote:
>
>>
>>tirsdag januar 29 2002 kl. 02:53 AM skrev Antony Stace:
>>
>>>I have a Struts project with a number of files and want to compile the 
>>>source files quicker.
>>>Does anyone know if the java compilers and runtime environments included 
>>>with Suns JDK 1.3 and 1.4 systems
>>>take advantage of a multiprocessor linux system(Assume a fairly recent 
>>>stable kernel) or will they use(in a 2 processor
>>>system) just one processor.  I want to speed up compile times but am not 
>>>sure if a multiprocessor system will do it.
>>
>>If you use a JVM with native threads then the operative system manages 
>>the individual threads, and may schedule them on different processors (if 
>>you use green threads, then the JVM does the thread managing itself in a 
>>single process, which will therefore use one processor only).
>>
>>As far as I know, javac is single-threaded, so that you will not benefit 
>>in doing a single compile.  If you can initiate several javac-processes 
>>at the same time, you will benefit.
>>
>>You may also want to look into whether your web container provides for a 
>>command-line batch compiler for jsp-pages.
>>For code, you may need a suitable IDE, but I do not have any suggestions.
>>
>>--
>>   Thorbjørn Ravn Andersen
>>   Scandiatransplant, c/o Christian Mondrup
>>   89 49 53 01
>>   http://biobase.dk/~tra
>>
>>
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>
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