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How do the likely/unlikely macros in the Linux kernel work and what is their benefit?
... As regards the fragment "[...]that it is being run in a tight loop", many CPUs have a branch predictor, thus using these macros only helps the first time code is executed or when the history table is overwritten by a different branch with the same index into the branching table. In a tight loop, a...
Node.js on multi-core machines
...ents and N processes doing heavy compute tasks and chewing up the other 15 CPUs.
For scaling throughput on a webservice, you should run multiple Node.js servers on one box, one per core and split request traffic between them. This provides excellent CPU-affinity and will scale throughput nearly line...
Mismatch Detected for 'RuntimeLibrary'
.... For example, many of the sources subtly depend upon the latest config.h, cpu.h and cpu.cpp. The "subtlety" is you won't realize you are getting an under-performing class.
An example of under-performing class is BLAKE2. config.h adds compile time ARM-32 and ARM-64 detection. cpu.h and cpu.cpp adds...
融资千万美元后的足记要如何应对“爆款后遗症”？ - 资讯 - 清泛网 - 专注C...
...作的一支短片，短片把3741位读者回答“我去何方”这个问题发来的图片和字幕连接起来，展现生活的不同可能性。
这是足记从图片出发延伸开去的路径：单张图片——多长图片——短视频——电影
“我们已经有几十部电影有...
Win32 创建控件风格不是Win XP的解决方案 - C/C++ - 清泛网 - 专注C/C++及内核技术
...="x86"，如果这个应用程序想在x64下面运行，就会导致一个问题：这个64位的程序链接的是32位的comctl32库，创建控件就会失败。所以最好的解决方案就是下面这种做法：
在头文件里面加入下面的语句：
#ifdef _UNICODE
#if defined _M_I...
Efficient evaluation of a function at every cell of a NumPy array
...ime generated C-function as ufunc
import numba as nb
@nb.vectorize(target="cpu")
def nb_vf(x):
return x+2*x*x+4*x*x*x
It easily beats np.vectorize but also when the same function would be performed as numpy-array multiplication/addition, i.e.
# numpy-functionality
def f(x):
return x+2*x*x...
Why is the JVM stack-based and the Dalvik VM register-based?
...ed design makes very few
assumptions about the target
hardware (registers, CPU features),
so it's easy to implement a VM on a
wide variety of hardware.
Since the operands for instructions
are largely implicit, the object
code will tend to be smaller. This
is important if you're going to be
downloadi...
Ora-00257 错误处理一列 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...$ echo $ORACLE_SID
空的
查看环境变量
vi .bash_profile 没有问题
查看权限
ll .bash_profile
-rw--rw--- 1 oracle oinstall 529 10鏈?24 20:18 /home/oracle/.bash_profile
有问题。修改权限
chmod 775 /home/oracle/.bash_profile
进入ORLACE
sqlplus /as sysd...
那些曾被追捧的90后创业男神女神，还好吗？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...果不言而喻，足足的曝光率使得安妮的团队赚尽了眼球，问题来了，接下来该如何走?如何不让流量流失?如何吸引更多的人进来?
这样的营销案例只能使用一次，保鲜期很短，长期高质量的内容输出很难做到，其实UGC是可以考虑...
Mysql ibdata 丢失或损坏如何通过frm&ibd 恢复数据 - 爬虫/数据库 - 清...
...需要注释掉，不然恢复模式不好操作。 这里有个关键的问题，就是innodb里的任何数据操作都是一个日志的记录点。也就是如果我们需要数据恢复，必须把之前的表的数据的日志记录点添加到一致。
a、建立一个数据库，根据上...