On Mon, 2008-09-29 at 12:42 +0530, nidhi mittal wrote: > Hi all > its a very basic ques may be for many of you .but i have this > confusion from long that is. > when we say this application is 32 bit application or 64 bit what do > we mean by that > is it processor which is 32 bit or 64 bit Primarily it is that. > or the OS which is is 32 bit or 64 bit Secondarily that too. But x86_64/amd64/em64t/intel64 has x86 compatibility (and Sparc64 for Sparc perhaps too). So can install and run a 64bit kernel and run the whole userspace compiled for 64bit. Or you can run only 32bit apps/libs in userspace on 64bit kernel (because your apps do not need > 4GB address space but you have 64GB RAM in your hardware). > or what ? Basically yes. But x86/64/AMD64/EM64T/... can run x86 32bit apps too (if the necessary libs are installed). > 2. Does it have some relation that in windows in C language int size According to the C standard, sizeof(int) is the native register width. And that is basically defined by the CPU. So if sizeof(int) == 2, you probably have some 16bit microcontroller. And at least for WinNT and XP, sizeof(int) == 4 on "normal PCs" BTW. > is 2 bytes in linux gcc it is 4 bytes > i mean any relation of word size with it ?? Yup. Bernd -- Firmix Software GmbH http://www.firmix.at/ mobil: +43 664 4416156 fax: +43 1 7890849-55 Embedded Linux Development and Services -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
