玩gpio用andrinuo

ETA 至少要38个小时吧，出点钱换个牌子更好点的吧

决定在IT行业混的就应该自觉抵制任何一家外包公司，为了整个行业环境比价好

更多的是使用习惯和环境吧

drop_caches

Writing to this will cause the kernel to drop clean caches, as well as
reclaimable slab objects like dentries and inodes. Once dropped, their
memory becomes free.

To free pagecache:
echo 1 > /proc/sys/vm/drop_caches
To free reclaimable slab objects (includes dentries and inodes):
echo 2 > /proc/sys/vm/drop_caches
To free slab objects and pagecache:
echo 3 > /proc/sys/vm/drop_caches

This is a non-destructive operation and will not free any dirty objects.
To increase the number of objects freed by this operation, the user may run
`sync' prior to writing to /proc/sys/vm/drop_caches. This will minimize the
number of dirty objects on the system and create more candidates to be
dropped.

This file is not a means to control the growth of the various kernel caches
(inodes, dentries, pagecache, etc...) These objects are automatically
reclaimed by the kernel when memory is needed elsewhere on the system.

Use of this file can cause performance problems. Since it discards cached
objects, it may cost a significant amount of I/O and CPU to recreate the
dropped objects, especially if they were under heavy use. Because of this,
use outside of a testing or debugging environment is not recommended.

You may see informational messages in your kernel log when this file is
used:

cat (1234): drop_caches: 3

These are informational only. They do not mean that anything is wrong
with your system. To disable them, echo 4 (bit 3) into drop_caches.

呵呵，现实是很残酷的

@zsj950618 别的评价都行，唯独这句我会受不了的

@seki 但是没成功啊，这个是我觉得比较成功的

@typcn 那个实时取数据呢

@reeco
@pierrec
不好意思，手机请看 mobile.btcchina.com 这个，我是加入收藏的，没注意

那应该是我孤陋寡闻了。。。大家有什么好的要么拿出来看看