On 3/11/07, Jerry Xue <buuker在gmail.com> wrote:
>
> ironpython


IronPythonÊÇÓÃC#ʵÏÖµÄpython½âÊÍÆ÷°É

ÔÚ07-3-11£¬wentrue <guozhuwen在gmail.com> дµÀ£º
> >
> > MSҲѡÔñÁËpythonÂð£¿ÏÖÔÚMSÓÐЩʲô¶«Î÷ÊÇÓÃpython×öµÄ£¿
> >
> > ÔÚ07-3-11£¬Jerry Xue < buuker在gmail.com> дµÀ£º
> > >
> > >
> > > ²»´í£¬JITÊǽű¾ºÍ¿çƽ̨ÓïÑÔÌá¸ßЧÂʵÄ×îºÃ£¬¿ÉÄÜÒ²ÊÇ×îÖյİ취ÁË£¬ÆäʵÈç¹ûÄÜÈÃJVM°ÑPYTHONÖ±½Ó±àÒë³É×Ö½ÚÂ룬Ȼºó¶¼½»¸øJVMÒ²ÊÇÒ»¸öºÃ°ì·¨£¬¶ø²»ÊÇJYTHONµÄ½âÊÍ·½Ê½¡£¿Éϧ£¬sunºÃÏñ¶ÔRUBY¸ü¸ÐÐËȤ¡£Òà»òÊǽö½öÒòΪMSÑ¡ÔñÁËPYTHON£¬ËùÒÔsunÒ»¶¨ÒªÑ¡ÔñÒ»¸ö²»Ò»ÑùµÄ
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-- 
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My Blog: http://blog.daviesliu.net/
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用linux的time命令来测试了上面的程序，python2.5 vs JDK 1.6，结果如下：
------------------------------------Python---------------------------------------------
-------- ConsoleTest --------
0.14user 0.01system 0:00.24elapsed 63%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+717minor)pagefaults 0swaps

-------- HashTest --------
0.66user 0.00system 0:00.71elapsed 95%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+721minor)pagefaults 0swaps

-------- IOTest --------
2.00user 0.04system 0:03.17elapsed 64%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+718minor)pagefaults 0swaps

-------- ListTest --------
0.68user 0.01system 0:00.79elapsed 88%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+716minor)pagefaults 0swaps

-------- ObjectTest --------
1.22user 0.00system 0:01.31elapsed 92%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+715minor)pagefaults 0swaps

-------- SpeedTest --------
1.54user 0.01system 0:01.59elapsed 97%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+714minor)pagefaults 0swaps

-----------------------------------------------Java--------------------------------------------
-------- ConsoleTest --------
0.46user 0.08system 0:00.64elapsed 84%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1major+2788minor)pagefaults 0swaps

-------- HashTest --------
0.35user 0.02system 0:00.50elapsed 75%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1major+2757minor)pagefaults 0swaps

-------- IOTest --------
0.65user 0.06system 0:00.86elapsed 83%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1major+2799minor)pagefaults 0swaps

-------- ListTest --------
0.22user 0.02system 0:00.47elapsed 52%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1major+2777minor)pagefaults 0swaps

-------- ObjectTest --------
0.07user 0.03system 0:00.59elapsed 17%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1major+2750minor)pagefaults 0swaps

-------- SpeedTest --------
0.14user 0.02system 0:00.82elapsed 20%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1major+2496minor)pagefaults 0swaps

-------------------------------------------------------------------------------------------------
总的来说，时间上除了ConsoleTest之外，其他都是java占优（即使是用时间*cpu占用率也是这样）；
但从pagefaults来看，python比java少，说明python的footprint比较少。

打个比喻就是：JAVA开发是常规战，PYTHON的开发是游击战：），不知道这个说法是否合适。
PS：我爱游击战！
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Python的内存回收是基于引用计数（也有mark&sweep;对付一些循环引用的情况），java的不是很清楚，但肯定不是引用计数。

引用计数的特征是将回收动作分散在程序运行期间，总的CPU消耗会比其他的回收技术多，但出现程序暂时中断的情况会很少。

java写的GUI程序不知道大家会不会感觉到，就是运行了一段时间后会出现挂起几秒的情况，这是由于内存回收程序暂时把程序中断了。

ObjectTest那个程序我是把循环从10000改到1000后测试的，原来的情况python运行了112秒！

我的看法是，做GUI的话Python比Java更合适，而Python在做后台服务的优势在于开发效率而不是运行效率。


在07-4-6，John fractal <johnfractal在gmail.com> 写道：
>
> 用linux的time命令来测试了上面的程序，python2.5 vs JDK 1.6，结果如下：
>
> ------------------------------------Python---------------------------------------------
> -------- ConsoleTest --------
> 0.14user 0.01system 0:00.24elapsed 63%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (0major+717minor)pagefaults 0swaps
>
> -------- HashTest --------
> 0.66user 0.00system 0:00.71elapsed 95%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (0major+721minor)pagefaults 0swaps
>
> -------- IOTest --------
> 2.00user 0.04system 0:03.17elapsed 64%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (0major+718minor)pagefaults 0swaps
>
> -------- ListTest --------
> 0.68user 0.01system 0:00.79elapsed 88%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (0major+716minor)pagefaults 0swaps
>
> -------- ObjectTest --------
> 1.22user 0.00system 0:01.31elapsed 92%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (0major+715minor)pagefaults 0swaps
>
> -------- SpeedTest --------
> 1.54user 0.01system 0:01.59elapsed 97%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (0major+714minor)pagefaults 0swaps
>
>
> -----------------------------------------------Java--------------------------------------------
> -------- ConsoleTest --------
> 0.46user 0.08system 0:00.64elapsed 84%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (1major+2788minor)pagefaults 0swaps
>
> -------- HashTest --------
> 0.35user 0.02system 0:00.50elapsed 75%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (1major+2757minor)pagefaults 0swaps
>
> -------- IOTest --------
> 0.65user 0.06system 0:00.86elapsed 83%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (1major+2799minor)pagefaults 0swaps
>
> -------- ListTest --------
> 0.22user 0.02system 0:00.47elapsed 52%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (1major+2777minor)pagefaults 0swaps
>
> -------- ObjectTest --------
> 0.07user 0.03system 0:00.59elapsed 17%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (1major+2750minor)pagefaults 0swaps
>
> -------- SpeedTest --------
> 0.14user 0.02system 0:00.82elapsed 20%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (1major+2496minor)pagefaults 0swaps
>
> -------------------------------------------------------------------------------------------------
>
> 总的来说，时间上除了ConsoleTest之外，其他都是java占优（即使是用时间*cpu占用率也是这样）；
> 但从pagefaults来看，python比java少，说明python的footprint比较少。
>
> 打个比喻就是：JAVA开发是常规战，PYTHON的开发是游击战：），不知道这个说法是否合适。
> PS：我爱游击战！
>
>
>
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On 4/6/07, John fractal <johnfractal在gmail.com> wrote:
>
> PythonµÄÄÚ´æ»ØÊÕÊÇ»ùÓÚÒýÓüÆÊý£¨Ò²ÓÐmark&sweep;¶Ô¸¶Ò»Ð©Ñ­»·ÒýÓõÄÇé¿ö£©£¬javaµÄ²»ÊǺÜÇå³þ£¬µ«¿Ï¶¨²»ÊÇÒýÓüÆÊý¡£
>
> ÒýÓüÆÊýµÄÌØÕ÷Êǽ«»ØÊÕ¶¯×÷·ÖÉ¢ÔÚ³ÌÐòÔËÐÐÆڼ䣬×ܵÄCPUÏûºÄ»á±ÈÆäËûµÄ»ØÊÕ¼¼Êõ¶à£¬µ«³öÏÖ³ÌÐòÔÝʱÖжϵÄÇé¿ö»áºÜÉÙ¡£
>
> javaдµÄGUI³ÌÐò²»ÖªµÀ´ó¼Ò»á²»»á¸Ð¾õµ½£¬¾ÍÊÇÔËÐÐÁËÒ»¶Îʱ¼äºó»á³öÏÖ¹ÒÆð¼¸ÃëµÄÇé¿ö£¬ÕâÊÇÓÉÓÚÄÚ´æ»ØÊÕ³ÌÐòÔÝʱ°Ñ³ÌÐòÖжÏÁË¡£
>
> ObjectTestÄǸö³ÌÐòÎÒÊÇ°ÑÑ­»·´Ó10000¸Äµ½1000ºó²âÊԵģ¬Ô­À´µÄÇé¿öpythonÔËÐÐÁË112Ã룡
>
> ÎҵĿ´·¨ÊÇ£¬×öGUIµÄ»°Python±ÈJava¸üºÏÊÊ£¬¶øPythonÔÚ×öºǫ́·þÎñµÄÓÅÊÆÔÚÓÚ¿ª·¢Ð§Âʶø²»ÊÇÔËÐÐЧÂÊ¡£
>
>
> ÔÚ07-4-6£¬John fractal <johnfractal在gmail.com > дµÀ£º
> >
> > ÓÃlinuxµÄtimeÃüÁîÀ´²âÊÔÁËÉÏÃæµÄ³ÌÐò£¬python2.5 vs JDK 1.6£¬½á¹ûÈçÏ£º
> > ------------------------------------Python---------------------------------------------
> >
> > -------- ConsoleTest --------
> > 0.14user 0.01system 0:00.24elapsed 63%CPU (0avgtext+0avgdata
> > 0maxresident)k
> > 0inputs+0outputs (0major+717minor)pagefaults 0swaps
> >
> > -------- HashTest --------
> > 0.66user 0.00system 0:00.71elapsed 95%CPU (0avgtext+0avgdata
> > 0maxresident)k
> > 0inputs+0outputs (0major+721minor)pagefaults 0swaps
> >
> > -------- IOTest --------
> > 2.00user 0.04system 0:03.17elapsed 64%CPU (0avgtext+0avgdata
> > 0maxresident)k
> > 0inputs+0outputs (0major+718minor)pagefaults 0swaps
> >
> > -------- ListTest --------
> > 0.68user 0.01system 0:00.79elapsed 88%CPU (0avgtext+0avgdata
> > 0maxresident)k
> > 0inputs+0outputs (0major+716minor)pagefaults 0swaps
> >
> > -------- ObjectTest --------
> > 1.22user 0.00system 0:01.31elapsed 92%CPU (0avgtext+0avgdata
> > 0maxresident)k
> > 0inputs+0outputs (0major+715minor)pagefaults 0swaps
> >
> > -------- SpeedTest --------
> > 1.54user 0.01system 0:01.59elapsed 97%CPU (0avgtext+0avgdata
> > 0maxresident)k
> > 0inputs+0outputs (0major+714minor)pagefaults 0swaps
> >
> >
> > -----------------------------------------------Java--------------------------------------------
> > -------- ConsoleTest --------
> > 0.46user 0.08system 0:00.64elapsed 84%CPU (0avgtext+0avgdata
> > 0maxresident)k
> > 0inputs+0outputs (1major+2788minor)pagefaults 0swaps
> >
> > -------- HashTest --------
> > 0.35user 0.02system 0:00.50elapsed 75%CPU (0avgtext+0avgdata
> > 0maxresident)k
> > 0inputs+0outputs (1major+2757minor)pagefaults 0swaps
> >
> > -------- IOTest --------
> > 0.65user 0.06system 0:00.86elapsed 83%CPU (0avgtext+0avgdata
> > 0maxresident)k
> > 0inputs+0outputs (1major+2799minor)pagefaults 0swaps
> >
> > -------- ListTest --------
> > 0.22user 0.02system 0:00.47elapsed 52%CPU (0avgtext+0avgdata
> > 0maxresident)k
> > 0inputs+0outputs (1major+2777minor)pagefaults 0swaps
> >
> > -------- ObjectTest --------
> > 0.07user 0.03system 0:00.59elapsed 17%CPU (0avgtext+0avgdata
> > 0maxresident)k
> > 0inputs+0outputs (1major+2750minor)pagefaults 0swaps
> >
> > -------- SpeedTest --------
> > 0.14user 0.02system 0:00.82elapsed 20%CPU (0avgtext+0avgdata
> > 0maxresident)k
> > 0inputs+0outputs (1major+2496minor)pagefaults 0swaps
> >
> > -------------------------------------------------------------------------------------------------
> >
> > ×ܵÄÀ´Ëµ£¬Ê±¼äÉϳýÁËConsoleTestÖ®Í⣬ÆäËû¶¼ÊÇjavaÕ¼ÓÅ£¨¼´Ê¹ÊÇÓÃʱ¼ä*cpuÕ¼ÓÃÂÊÒ²ÊÇÕâÑù£©£»
> > µ«´ÓpagefaultsÀ´¿´£¬python±ÈjavaÉÙ£¬ËµÃ÷pythonµÄfootprint±È½ÏÉÙ¡£
> >
> > ´ò¸ö±ÈÓ÷¾ÍÊÇ£ºJAVA¿ª·¢Êdz£¹æÕ½£¬PYTHONµÄ¿ª·¢ÊÇÓλ÷Õ½£º£©£¬²»ÖªµÀÕâ¸ö˵·¨ÊÇ·ñºÏÊÊ¡£
> > PS£ºÎÒ°®Óλ÷Õ½£¡
> >
> >
> >
>
> _______________________________________________
> python-chinese
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-- 
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http://www.nirvanastudio.org
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On 4/6/07, Nicholas Ding <nicholasdsj在gmail.com> wrote:
>
> PS£º±È½ÏÄĸöÓïÑÔ¿ì²»¿ìÕæµÄûÒâ˼£¬ÎÒÊÇÒ»¸ö"Õýͳ"µÄ Java ¿ª·¢Õߣ¬µ«ÊÇÎÒºÜÀÁ£¬ÓÚÊÇÎÒÄ¿Ç°×ÜÊÇÓà Python ÔÚ䶫Î÷......


Ç¿ÁÒͬÒâÄãÕâÒ»µã£¬ÏÖÔÚÒѾ­²»ÊǶÔËٶȺÍÄÚ´æÕ¼ÓÃÁ¿½ï½ï¼Æ½ÏµÄʱºòÁË£¬¸üÖØÒªµÄÊÇÈçºÎ¿ìËٵıí´ïÏë·¨£¬×·Ç󿪷¢µÄЧÂʺͿÉά»¤ÐÔ¡£

Davies
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Davies Liu 写道:
> 强烈同意你这一点，现在已经不是对速度和内存占用量斤斤计较的时候了，更重
> 要的是如何快速的表达想法，追求开发的效率和可维护性。
>
我觉得，用Python是一种很爽的事，用它写的代码很优雅，但是不敢在公司项目中
使用。

jythonÓëpythonÖ»ÊǽâÊÍÆ÷ÉϵIJ»Í¬£¿»¹ÊÇÒ»ÖÖȫеÄÓïÑÔ£¿

On 4/6/07, ÁÖ½Ü½Ü <limkatkat在gmail.com> wrote:
>
> Davies Liu дµÀ:
> > Ç¿ÁÒͬÒâÄãÕâÒ»µã£¬ÏÖÔÚÒѾ­²»ÊǶÔËٶȺÍÄÚ´æÕ¼ÓÃÁ¿½ï½ï¼Æ½ÏµÄʱºòÁË£¬¸üÖØ
> > ÒªµÄÊÇÈçºÎ¿ìËٵıí´ïÏë·¨£¬×·Ç󿪷¢µÄЧÂʺͿÉά»¤ÐÔ¡£
> >
> ÎÒ¾õµÃ£¬ÓÃPythonÊÇÒ»ÖÖºÜˬµÄÊ£¬ÓÃËüдµÄ´úÂëºÜÓÅÑÅ£¬µ«ÊDz»¸ÒÔÚ¹«Ë¾ÏîÄ¿ÖÐ
> ʹÓá£
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