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Multithreading: What is the point of more threads than cores?
...ore than 4 threads running at a time? Wouldn't they just be stealing time (CPU Resources) from each other?
17 Answers
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Static linking vs dynamic linking
...g it all before it can be used (emptying most of the caches, hitting TLBs) etc. There was a time when this was considered slow.
So you would not have any benefit anymore.
I do not recall what OS (Solaris or FreeBSD) gave me problems with my Unix build system because I just wasn't doing this and w...
PHP操作MongoDB时的整数问题及对策 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
PHP操作MongoDB时的整数问题及对策本文所说的整数问题，其实并不是MongoDB的问题，而是PHP驱动的问题：MongoDB本身有两种整数类型，分别是：32位整数和64位整数，但旧版的PHP...本文所说的整数问题，其实并不是MongoDB的问题，而是P...
Best approach to remove time part of datetime in SQL Server
...es on internal storage
it extends to work out first day of month, tomorrow etc by changing "0" base
Edit, Oct 2011
For SQL Server 2008+, you can CAST to date i.e. CAST(getdate() AS date). Or just use date datatype so no time to remove.
Edit, Jan 2012
A worked example of how flexible this is: Ne...
OS X10.9 环境下部署 QT5.3.1 常见的编译问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
OS X10.9 环境下部署 QT5.3.1 常见的编译问题出于本身对UNIX系统的好奇，以及身边一群对 Swift 语言各种推崇的苹果教徒的影响，这几天折腾起 MAC OS X来，体验下这个被无数开发者...
出于本身对UNIX系统的好奇，以及身边一群对 Swift ...
linux下iptables配置详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...成DROP的话)
允许loopback!(不然会导致DNS无法正常关闭等问题)
IPTABLES -A INPUT -i lo -p all -j ACCEPT (如果是INPUT DROP)
IPTABLES -A OUTPUT -o lo -p all -j ACCEPT(如果是OUTPUT DROP)
下面写OUTPUT链,OUTPUT链默认规则是ACCEPT,所以我们就写需要DROP(放弃)...
Groovy executing shell commands
...ommand with env vars: envVars = ["P4PORT=p4server:2222", "P4USER=user", "P4PASSWD=pass", "P4CLIENT=p4workspace"]; workDir = new File("path"); cmd = "bash -c \"p4 change -o 1234\""; proc = cmd.execute(envVars, workDir);
– Noam Manos
Nov 5 '13 at 9:39
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How to turn off INFO logging in Spark?
...rk 1.5. RHEL 6. CDH 5.5. Tried creating new file /opt/cloudera/parcels/CDH/etc/spark/conf.dist/log4j.properties and changing like explained above. And also tried editing existing file /etc/spark/conf/log4j.properties. No effect for pyspark shell nor for pyspark-shell.
– Tagar
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What does Python's eval() do?
... I have 8 cores so I would want a list [1, 8].
>>>from os import cpu_count
>>>eval('[1, cpu_count()]')
[1, 8]
Likewise all of __builtins__ is available.
>>>eval('abs(-1)')
1
Ok. So there we see one function we want exposed and an example of one (of many that can be m...
Difference between global and device functions
...
__global__ - Runs on the GPU, called from the CPU or the GPU*. Executed with <<<dim3>>> arguments.
__device__ - Runs on the GPU, called from the GPU. Can be used with variabiles too.
__host__ - Runs on the CPU, called from the CPU.
*) __global__ funct...