晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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=== Simple user tips for improving power usage ===
* Use a properly dimensioned system for the job (no need for overpowered systems for simple Desktop use e.g.).
* For servers consolidate services on fewer systems to maximize efficiency of each system.
* For a server farm consolidating all physical machines on one bigger server and then using Virtualization.
* Enforce turning off machines that are not used (e.g. company policy).
* Try to establish a company culture that is Green "aware", including but not limited to the above point.
* Unplug and/or turn off peripherals that aren't used (e.g. external USB devices, monitors, printers, scanners).
* Turn off unused hardware already in BIOS.
* Disable power hungry features.
* Enable CPU scaling if supported for ondemand CPU governor. DO NOT use powersave governor, typically uses more power than ondemand
(race to idle).
* Put network card to 100 mbit/10 mbit:
** 10 mbit: ethtool -s eth0 advertise 0x002
** 100 mbit: ethtool -s eth0 advertise 0x008
** Doesn't work for every card
* Put harddisk to spindown fast and full power saving:
** hdparm -S240 /dev/sda (20m idle to spindown)
** hdparm -B1 /dev/sda (Max powersave mode)
* Make sure writes to hd don't wake it up too quickly:
** Set flushing to once per 5 minutes
** echo "3000" > /proc/sys/vm/dirty_writeback_centisecs
** Enable laptop mode
** echo "5" > /proc/sys/vm/laptop_mode
* Use relatime for your / partition
** mount -o remount,relatime / 
* Enable USB autosuspend by adding the following to the kernel boot commandline:
** usbcore.autosuspend=5 
* Screensaver needs to dpms off the screen, not just make colors black.  To turn off monitor after 120s when X is running:
** xset dpms 0 0 120

=== Simple programmer tips for improving power usage ===
* Avoid unnecessary work/computation
* Use efficient algorithms 
* Wake up only when necessary/real work is pending
* Do not actively poll in programs or use short regular timeouts, rather react to events 
* If you wake up, do everything at once (race to idle) and as fast as possible
* Use large buffers to avoid frequent disk access. Write one large block at a time
* Don't use [f]sync() if not necessary
* Group timers across applications if possible (even systems)

haha - 2025