°Ë¸ö²½ÖèÐÞ¸ÄlinuxÊ±Çø
For ubuntu: [1]http://webonrails.com/2009/07/15/change-timezone-of-ubuntu-machine-from-command-line/
2
Logged in as root, check which timezone your machine is currently using by executing `date`. You'll see something like Mon 17 Jan 2005 12:15:08 PM PST, PST in this case is the current timezone.
3
Change to the directory /usr/share/zoneinfo here you will find a list of time zone regions.Choose the most appropriate region, if you live in Canada or the US this directory is the "America" directory.
4
If you wish, backup the previous timezone configuration by copying it to a different location. Such as
mv /etc/localtime /etc/localtime-old
5
Create a symbolic link to the appropriate timezone from /etc/localtime. Example:
ln -sf /usr/share/zoneinfo/Europe/Amsterdam /etc/localtime
6
If you have the utility rdate, update the current system time by executing
/usr/bin/rdate -s time-a.nist.gov
7
Set the ZONE entry in the file /etc/sysconfig/clock file (e.g. "America/Los_Angeles")
8
Set the hardware clock by executing:
/sbin/hwclock --systohc
2.ÐÞ¸ÄmysqlÊ±Çø
MySQL Ê±ÇøÄ¬ÈÏÊÇ·þÎñÆ÷µÄÊ±Çø¡£
¿ÉÒÔͨ¹ýÒÔÏÂÃüÁî²é¿´SQL´úÂëmysql> show variables like '%time_zone%'; +------------------+--------+ | Variable_name | Value | +------------------+--------+ | system_time_zone | CST | | time_zone | SYSTEM | +------------------+--------+ 2 rows in set (0.00 sec) ¿ÉÒÔͨ¹ýÐÞ¸Ämy.cnf
ÔÚ [mysqld] ֮ϼÓ
default-time-zone=timezone
À´ÐÞ¸ÄÊ±Çø¡£È磺
default-time-zone = '+8:00'
¸ÄÁ˼ǵÃÖØÆômsyqlà¸
×¢ÒâÒ»¶¨ÒªÔÚ [mysqld] Ö®ÏÂ¼Ó £¬·ñÔò»á³öÏÖ unknown variable 'default-time-zone=+8:00'
ÁíÍâÒ²¿ÉÒÔͨ¹ýÃüÁî set t
Ïà¹ØÎĵµ£º
Service Discovery Protocol(SDP)ÌṩһÖÖÄÜÁ¦£¬ÈÃÓ¦ÓóÌÐòÓз½·¨·¢ÏÖÄÄÖÖ·þÎñ¿ÉÓÃÒÔ¼°ÕâÖÖ·þÎñµÄÌØÐÔ¡£
·þÎñ·¢ÏÖÐÒé(SDP»òBluetooth SDP)ÔÚÀ¶ÑÀÐÒéÕ»ÖжÔÀ¶ÑÀ»·¾³ÖеÄÓ¦ÓóÌÐòÓÐÌØÊâµÄº¬Ò⣬·¢ÏÖÄĸö·þÎñÊÇ¿ÉÓõĺÍÈ·¶¨ÕâЩ¿ÉÓ÷þÎñµÄÌØÕ÷¡£SDP¶¨ÒåÁËbluetooth client·¢ÏÖ¿ÉÓÃbluetooth server·þÎñºÍËüÃǵÄÌØÕ÷µÄ·½·¨¡£ ......
ÔÚLinuxϵͳÖУ¬rootÓû§ÊÇÒ»¸öȨÏ޷dz£´óµÄÓû§£¬ÕýÒòΪÆäȨÏÞ´óµ½ÄÜΣ¼°²Ù×÷ϵͳµÄ°²È«£¬ËùÒÔÎÒÃÇÆ½Ê±²Ù×÷µçÄÔµÄʱºò¶¼ÊÇÓÃµÄÆÕͨÓû§
Ãû£¬Ö»ÓÐÔÚijЩ³¡ºÏÉèÖÃÐèÒª³¬¼¶Óû§È¨ÏÞµÄʱºòÔÙÁÙʱÓÃsuÃüÁîÇл»ÎªrootÓû§¡£²»¹ýÓÐʱºò²»ÏëÈÃÎÒµÄrootÃÜÂë¸æËß±ðÈË£¬µ«ÊÇÒ²Ïë±ðÈË×öһЩ³¬¹ý
ÆÕͨÓû§°²È«¼¶±ðµÄ²Ù×÷Ó¦¸ÃÔõô×öÄØ£ ......
LinuxÏÂÍøÂç±à³Ì¸ÅÊö
Ò»£®ÍøÂç֪ʶ¸ÅÊö
ÍøÂç³ÌÐòºÍÆÕͨ³ÌÐò×î´óµÄÇø±ðÊÇÍøÂç³ÌÐòÓÉÁ½²¿·Ö×é³É£º¿Í»§¶ËºÍ·þÎñÆ÷¶Ë¡£
¿Í»§¶Ë£ºÔÚÍøÂç³ÌÐòÖУ¬Èç¹ûÒ»¸ö³ÌÐòÖ÷¶¯ºÍÍâÃæµÄ³ÌÐòͨÐÅ£¬ÄÇôÎÒÃǾͰѸóÌÐò³ÆÎª¿Í»§¶Ë³ÌÐò¡£
·þÎñÆ÷¶Ë£ººÍ¿Í»§¶Ë¶ÔÓ¦µÄ³ÌÐò¼´Îª·þÎñÆ÷¶Ë£»±»¶¯µØµÈ´ýÍâÃæ³ÌÐòÀ´ºÍ×Ô¼ºÍ¨ÐŵijÌÐò¼´Îª·þÎñÆ÷¶Ë³ÌÐò¡ ......
Gcc¼ò½é
LinuxϵͳϵÄgcc£¨GNU C Compiler£©ÊÇGNUÍÆ³öµÄ¹¦ÄÜÇ¿´ó¡¢ÐÔÄÜÓÅÔ½µÄ¶àƽ̨±àÒëÆ÷£¬ÊÇGNUµÄ´ú±í×÷Æ·Ö®Ò»¡£gccÊÇ¿ÉÒÔÔÚ¶àÖÖÓ²ÌåÆ½Ì¨ÉϱàÒë³ö¿ÉÖ´ÐгÌÐòµÄ³¬¼¶±àÒëÆ÷£¬ÆäÖ´ÐÐЧÂÊÓëÒ»°ãµÄ±àÒëÆ÷Ïà±Èƽ¾ùЧÂÊÒª¸ß20%~30%¡£
gcc ±àÒëÆ÷Äܽ«C¡¢C++ÓïÑÔÔ´³ÌÐò¡¢»ã³Ìʽ»¯ÐòºÍÄ¿±ê³ÌÐò±àÒë¡¢Á¬½Ó³É¿ÉÖ´ÐÐÎļþ£¬Èç¹ûûÓи ......
Ò³ÉêÇëµÄºËÐĵ÷ÓÃÊÇ: __alloc_pages(). Ò³ÉêÇë˳ÐòÈçÏ£º
Ê×ÏÈÕÒ×î´óÄÜ·ûºÏµÄ¿é, Èç¹ûÒ»¸ö¿ÕÏп鲻ÄÜÂú×ã, ¸ü¸ßÒ»¼¶µÄ¿é½«·Ö¸î³É2¸öbuddy, Ò»¸ö±»Õ¼ÓÃ, Ò»¸ö·ÅÈëµÍÒ»¼¶µÄfreelist.
µ±¿é±»ÊÍ·Åʱ, ¼ì²éÿ¶Ôbuddy, Èç¹ûÁ½Õß¶¼¿ÕÏÐ, °ÑËûÃǺϲ¢µ½¸ü¸ßÒ»¼¶µÄ¿éÊý×é ......