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标题：[python-chinese] 如何测量一个变量或者常量在内存中的大小
2004年08月10日 星期二 16:38
gentoo.cn gentoo.cn at 126.com
Tue Aug 10 16:38:23 HKT 2004
[导入自Mailman归档：http://www.zeuux.org/pipermail/zeuux-python]
Tue Aug 10 16:38:23 HKT 2004
一般来说，使用python, java这样有gc的程序时不用关心内存分配（memory killer) 但是，有的应用场合可能你需要关心object的大小 比如：类似于Zope这样的Object容器里的Cache, 太大的Object不要放到Cache里来 抑或，有个叫pythonOS的东东里可能也需要哦。 limodou wrote: >Zoom.Quiet,您好！ > > 也不至于要细到要知道内存大小。 > >======= 2004-08-10 15:54:28 您在来信中写道：======= > > > >>Hollo limodou: >> >> 不能说不关心哪？！ >>Python 在嵌入设置中也有移植的！性能的追求是一切语言不能忽略的是也乎，不过 Python 以另外的方式来完成，当然也有提高的余地，有忐者可以开始探险哪！？ >> >> >>/******** [2004-08-10]15:52:50 ; limodou wrote: >> >>limodou> tocer,您好！ >> >>limodou> 因为使用Python根本不关心这个。不要总把C/C++里的概念在Python中使用，因为它们根本就不一样。 >> >>limodou> ======= 2004-08-10 15:33:00 您在来信中写道：======= >> >> >> >>>>没想到这么难解决 >>>> >>>>----- Original Message ----- >>>>From: "gentoo.cn" <gentoo.cn at 126.com> >>>>To: <python-chinese at lists.python.cn> >>>>Sent: Tuesday, August 10, 2004 12:53 PM >>>>Subject: Re: [python-chinese] 如何测量一个变量或者常量在内存中的大小 >>>> >>>> >>>> >>>> >>>>>找到一个相关的讨论 >>>>>http://www.egenix.com/mailman-archives/egenix-users/2002-November/000156.html >>>>> >>>>>gentoo.cn wrote: >>>>> >>>>> >>>>> >>>>>>我的意思是：是不是可以通过计算一个Object的Struct来猜测这个Object的大小？ >>>>>>比如c='a', string="abcd" >>>>>>那么c的类型是1c, string的类型是4c >>>>>>calcsize('c')=1 >>>>>>calcsize('L')=4 >>>>>>也就是说一个数值型的对象占用4Bytes内存空间，一个字符型对象占用1Bytes内存 >>>>>>空间？ >>>>>>对于string="abcd"这个对象，类型是4c所以占用4Bytes内存空间？ >>>>>>不知道Python如何考虑对齐的（也许他最小的单位是1Bytes所以都是8bit的倍数， >>>>>>这样就对齐了？） >>>>>> >>>>>>大家都来讨论讨论啊。 >>>>>> >>>>>> >>>>>> >>>>>>limodou wrote: >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>>>gentoo.cn,您好！ >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>那个不是内存的大小吧。而是对应的struct的大小。因为在python中都是对象，而不仅仅是数据结构。不知道:你想知道内存大小有什么用？ >>>>> >>>>> >>>>>>>======= 2004-08-10 11:05:42 您在来信中写道：======= >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>>>import struct >>>>>>>>struct.pack >>>>>>>>struct.calcsize ? >>>>>>>> >>>>>>>>难道使用这个方法吗？ >>>>>>>>我也想知道有什么方法来计算对象的size >>>>>>>> >>>>>>>>*calcsize*( fmt) >>>>>>>> >>>>>>>> Return the size of the struct (and hence of the string) >>>>>>>> corresponding to the given format. >>>>>>>> >>>>>>>>Format characters have the following meaning; the conversion between C >>>>>>>>and Python values should be obvious given their types: >>>>>>>> >>>>>>>>*Format* *C Type* *Python* *Notes* >>>>>>>>x pad byte no value >>>>>>>>c char string of length 1 >>>>>>>>b signed char integer >>>>>>>>B unsigned char integer >>>>>>>>h short integer >>>>>>>>H unsigned short integer >>>>>>>>i int integer >>>>>>>>I unsigned int long >>>>>>>>l long integer >>>>>>>>L unsigned long long >>>>>>>>q long long long (1) >>>>>>>>Q unsigned long long long (1) >>>>>>>>f float float >>>>>>>>d double float >>>>>>>>s char[] string >>>>>>>>p char[] string >>>>>>>>P void * integer >>>>>>>> >>>>>>>> >>>>>>>>tocer wrote: >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>>>比如： >>>>>>>>>a=[1,2,3] >>>>>>>>>测试 a 在内存中的所占的字节数 >>>>>>>>> >>>>>>>>>------------------------------------------------------------------------ >>>>>>>>> >>>>>>>>>_______________________________________________ >>>>>>>>>python-chinese list >>>>>>>>>python-chinese at lists.python.cn >>>>>>>>>http://python.cn/mailman/listinfo/python-chinese >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>_______________________________________________ >>>>>>>>python-chinese list >>>>>>>>python-chinese at lists.python.cn >>>>>>>>http://python.cn/mailman/listinfo/python-chinese >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>= = = = = = = = = = = = = = = = = = = = >>>>>>> >>>>>>> >>>>>>> 致 >>>>>>>礼！ >>>>>>> >>>>>>> >>>>>>> limodou >>>>>>> chatme at 263.net >>>>>>> 2004-08-10 >>>>>>> >>>>>>> >>>>>>> >>>>>>>------------------------------------------------------------------------ >>>>>>> >>>>>>>_______________________________________________ >>>>>>>python-chinese list >>>>>>>python-chinese at lists.python.cn >>>>>>>http://python.cn/mailman/listinfo/python-chinese >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>_______________________________________________ >>>>>>python-chinese list >>>>>>python-chinese at lists.python.cn >>>>>>http://python.cn/mailman/listinfo/python-chinese >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>_______________________________________________ >>>>>python-chinese list >>>>>python-chinese at lists.python.cn >>>>>http://python.cn/mailman/listinfo/python-chinese >>>>>_______________________________________________ >>>>> >>>>> >>>>python-chinese list >>>>python-chinese at lists.python.cn >>>>http://python.cn/mailman/listinfo/python-chinese >>>> >>>> >>>> >>limodou> = = = = = = = = = = = = = = = = = = = = >> >> >>limodou> 致 >>limodou> 礼！ >> >> >>limodou> limodou >>limodou> chatme at 263.net >>limodou> 2004-08-10 >> >> >> >>********************************************/ >> >>-- >>Free as in Freedom >> >>Zoom.Quiet >> >>#=========================================# >>]Time is unimportant, only life important![ >>#=========================================# >> >>sender is the Bat!2.12.00 >> >>_______________________________________________ >>python-chinese list >>python-chinese at lists.python.cn >>http://python.cn/mailman/listinfo/python-chinese >> >> >> > >= = = = = = = = = = = = = = = = = = = = > > > 致 >礼！ > > > limodou > chatme at 263.net > 2004-08-10 > > > >------------------------------------------------------------------------ > >_______________________________________________ >python-chinese list >python-chinese at lists.python.cn >http://python.cn/mailman/listinfo/python-chinese > >
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2004年08月10日 星期二 16:40
hoxide hoxide_dirac at yahoo.com.cn
Tue Aug 10 16:40:49 HKT 2004
[导入自Mailman归档：http://www.zeuux.org/pipermail/zeuux-python]
Tue Aug 10 16:40:49 HKT 2004
gentoo.cn,您好！ 如果把python嵌入到便携设备,比如手机之类的,可能就需要严格控制内存了. 好像有人在做这个,或者是用jython吧.我不太清楚.另外用python做deamon也很需要严格监控内存. ======= 2004-08-10 16:38:23 您在来信中写道：======= >一般来说，使用python, java这样有gc的程序时不用关心内存分配（memory killer) >但是，有的应用场合可能你需要关心object的大小 >比如：类似于Zope这样的Object容器里的Cache, 太大的Object不要放到Cache里来 > >抑或，有个叫pythonOS的东东里可能也需要哦。 > >limodou wrote: > >>Zoom.Quiet,您好！ >> >> 也不至于要细到要知道内存大小。 >> >>======= 2004-08-10 15:54:28 您在来信中写道：======= >> >> >> >>>Hollo limodou: >>> >>> 不能说不关心哪？！ >>>Python 在嵌入设置中也有移植的！性能的追求是一切语言不能忽略的是也乎，不过 Python 以另外的方式来完成，当然也有提高的余地，有忐者可以开始探险哪！？ >>> >>> >>>/******** [2004-08-10]15:52:50 ; limodou wrote: >>> >>>limodou> tocer,您好！ >>> >>>limodou> 因为使用Python根本不关心这个。不要总把C/C++里的概念在Python中使用，因为它们根本就不一样。 >>> >>>limodou> ======= 2004-08-10 15:33:00 您在来信中写道：======= >>> >>> >>> >>>>>没想到这么难解决 >>>>> >>>>>----- Original Message ----- >>>>>From: "gentoo.cn" <gentoo.cn at 126.com> >>>>>To: <python-chinese at lists.python.cn> >>>>>Sent: Tuesday, August 10, 2004 12:53 PM >>>>>Subject: Re: [python-chinese] 如何测量一个变量或者常量在内存中的大小 >>>>> >>>>> >>>>> >>>>> >>>>>>找到一个相关的讨论 >>>>>>http://www.egenix.com/mailman-archives/egenix-users/2002-November/000156.html >>>>>> >>>>>>gentoo.cn wrote: >>>>>> >>>>>> >>>>>> >>>>>>>我的意思是：是不是可以通过计算一个Object的Struct来猜测这个Object的大小？ >>>>>>>比如c='a', string="abcd" >>>>>>>那么c的类型是1c, string的类型是4c >>>>>>>calcsize('c')=1 >>>>>>>calcsize('L')=4 >>>>>>>也就是说一个数值型的对象占用4Bytes内存空间，一个字符型对象占用1Bytes内存 >>>>>>>空间？ >>>>>>>对于string="abcd"这个对象，类型是4c所以占用4Bytes内存空间？ >>>>>>>不知道Python如何考虑对齐的（也许他最小的单位是1Bytes所以都是8bit的倍数， >>>>>>>这样就对齐了？） >>>>>>> >>>>>>>大家都来讨论讨论啊。 >>>>>>> >>>>>>> >>>>>>> >>>>>>>limodou wrote: >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>>>gentoo.cn,您好！ >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>那个不是内存的大小吧。而是对应的struct的大小。因为在python中都是对象，而不仅仅是数据结构。不知道:你想知道内存大小有什么用？ >>>>>> >>>>>> >>>>>>>>======= 2004-08-10 11:05:42 您在来信中写道：======= >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>>>import struct >>>>>>>>>struct.pack >>>>>>>>>struct.calcsize ? >>>>>>>>> >>>>>>>>>难道使用这个方法吗？ >>>>>>>>>我也想知道有什么方法来计算对象的size >>>>>>>>> >>>>>>>>>*calcsize*( fmt) >>>>>>>>> >>>>>>>>> Return the size of the struct (and hence of the string) >>>>>>>>> corresponding to the given format. >>>>>>>>> >>>>>>>>>Format characters have the following meaning; the conversion between C >>>>>>>>>and Python values should be obvious given their types: >>>>>>>>> >>>>>>>>>*Format* *C Type* *Python* *Notes* >>>>>>>>>x pad byte no value >>>>>>>>>c char string of length 1 >>>>>>>>>b signed char integer >>>>>>>>>B unsigned char integer >>>>>>>>>h short integer >>>>>>>>>H unsigned short integer >>>>>>>>>i int integer >>>>>>>>>I unsigned int long >>>>>>>>>l long integer >>>>>>>>>L unsigned long long >>>>>>>>>q long long long (1) >>>>>>>>>Q unsigned long long long (1) >>>>>>>>>f float float >>>>>>>>>d double float >>>>>>>>>s char[] string >>>>>>>>>p char[] string >>>>>>>>>P void * integer >>>>>>>>> >>>>>>>>> >>>>>>>>>tocer wrote: >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>>>比如： >>>>>>>>>>a=[1,2,3] >>>>>>>>>>测试 a 在内存中的所占的字节数 >>>>>>>>>> >>>>>>>>>>------------------------------------------------------------------------ >>>>>>>>>> >>>>>>>>>>_______________________________________________ >>>>>>>>>>python-chinese list >>>>>>>>>>python-chinese at lists.python.cn >>>>>>>>>>http://python.cn/mailman/listinfo/python-chinese >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>_______________________________________________ >>>>>>>>>python-chinese list >>>>>>>>>python-chinese at lists.python.cn >>>>>>>>>http://python.cn/mailman/listinfo/python-chinese >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>= = = = = = = = = = = = = = = = = = = = >>>>>>>> >>>>>>>> >>>>>>>> 致 >>>>>>>>礼！ >>>>>>>> >>>>>>>> >>>>>>>> limodou >>>>>>>> chatme at 263.net >>>>>>>> 2004-08-10 >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>>------------------------------------------------------------------------ >>>>>>>> >>>>>>>>_______________________________________________ >>>>>>>>python-chinese list >>>>>>>>python-chinese at lists.python.cn >>>>>>>>http://python.cn/mailman/listinfo/python-chinese >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>_______________________________________________ >>>>>>>python-chinese list >>>>>>>python-chinese at lists.python.cn >>>>>>>http://python.cn/mailman/listinfo/python-chinese >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>_______________________________________________ >>>>>>python-chinese list >>>>>>python-chinese at lists.python.cn >>>>>>http://python.cn/mailman/listinfo/python-chinese >>>>>>_______________________________________________ >>>>>> >>>>>> >>>>>python-chinese list >>>>>python-chinese at lists.python.cn >>>>>http://python.cn/mailman/listinfo/python-chinese >>>>> >>>>> >>>>> >>>limodou> = = = = = = = = = = = = = = = = = = = = >>> >>> >>>limodou> 致 >>>limodou> 礼！ >>> >>> >>>limodou> limodou >>>limodou> chatme at 263.net >>>limodou> 2004-08-10 >>> >>> >>> >>>********************************************/ >>> >>>-- >>>Free as in Freedom >>> >>>Zoom.Quiet >>> >>>#=========================================# >>>]Time is unimportant, only life important![ >>>#=========================================# >>> >>>sender is the Bat!2.12.00 >>> >>>_______________________________________________ >>>python-chinese list >>>python-chinese at lists.python.cn >>>http://python.cn/mailman/listinfo/python-chinese >>> >>> >>> >> >>= = = = = = = = = = = = = = = = = = = = >> >> >> 致 >>礼！ >> >> >> limodou >> chatme at 263.net >> 2004-08-10 >> >> >> >>------------------------------------------------------------------------ >> >>_______________________________________________ >>python-chinese list >>python-chinese at lists.python.cn >>http://python.cn/mailman/listinfo/python-chinese >> >> > >_______________________________________________ >python-chinese list >python-chinese at lists.python.cn >http://python.cn/mailman/listinfo/python-chinese = = = = = = = = = = = = = = = = = = = = 致 礼！ hoxide hoxide_dirac at yahoo.com.cn 2004-08-10
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