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Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
...ons=16 -falign-loops=16
Long answer:
The code will run slower if:
an XX byte boundary cuts add() in the middle (XX being machine dependent).
if the call to add() has to jump over an XX byte boundary and the target is not aligned.
if add() is not aligned.
if the loop is not aligned.
The firs...
Real differences between “java -server” and “java -client”?
...o a -server application. For instance, on my Linux system, I get:
$ java -XX:+PrintFlagsFinal -version 2>&1 | grep -i -E 'heapsize|permsize|version'
uintx AdaptivePermSizeWeight = 20 {product}
uintx ErgoHeapSizeLimit = 0 {product}...
Convert pem key to ssh-rsa format
...ey from the PEM formatted RSA pair
in PEM format:
openssl rsa -in dummy-xxx.pem -pubout
in OpenSSH v2 format see:
ssh-keygen -y -f dummy-xxx.pem
Notes
OS and software version:
[user@test1 ~]# cat /etc/redhat-release ; uname -a ; openssl version
CentOS release 6.5 (Final)
Linux test1.exampl...
Remove file from SVN repository without deleting local copy
...
When you want to remove one xxx.java file from SVN:
Go to workspace path where the file is located.
Delete that file from the folder (xxx.java)
Right click and commit, then a window will open.
Select the file you deleted (xxx.java) from the folder, a...
How do I reattach to a detached mosh session?
...etached session, use the PID number displayed in that message (that's the 'XXXX' part.) For example, if you see --
Mosh: You have a detached Mosh session on this server (mosh [12345]).
And can run this command:
kill 12345
Also, to close all mosh connections you can:
kill `pidof mosh-server`
...
How to split a long regular expression into multiple lines in JavaScript?
... second parameter
/regex/g => new RegExp('regex', 'g')
[Addition ES20xx (tagged template)]
In ES20xx you can use tagged templates. See the snippet.
Note:
Disadvantage here is that you can't use plain whitespace in the regular expression string (always use \s, \s+, \s{1,x}, \t, \n etc).
...
.a: error adding symbols: File format not recognized 原因 - 操作系统(...
...ng-symbols-file-format-not-recognizedlinux,gccLinux编译链接时报错：xxx a: error adding symbols: File format not recognized。也可能出现编译能通过，但ldd报链接失败不能运行。原因是：在低版本Linux GCC上编译工程 Linux编译链接时报错：xxx.a: error addin...
c++读注册表 - C/C++ - 清泛网 - 专注C/C++及内核技术
...mat(_T("Software Microsoft Windows CurrentVersion App Paths xxx"));HKEY hKey;LONG rc = R...直接上代码：
CString key;
key.Format(_T("Software\\Microsoft\\Windows\\CurrentVersion\\App Paths\\xxx"));
HKEY hKey;
LONG rc = RegOpenKey(HKEY_LOCAL_MACHINE, key, &hKey);
if (ERROR_...
C++ 智能指针shared_ptr,weak_ptr,shared_from_this实践 - C/C++ - 清泛网 - 专注C/C++及内核技术
C++ 智能指针shared_ptr,weak_ptr,shared_from_this实践new XXX(shared_from_this()) 如果用强指针去接，则增加引用计数；弱引用去接，不增加引用计数。auto去接等同强指针。weak_ptr 传给thread、timer回调，不能使用expired()判断
new XXX(shared_from_thi...
git拉取子模块的方法 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...以使用：git submodule update --init --recursive 更新单个子模块xxxgit su 如果首次克隆仓库及其模块，使用：
git clone --recursive 仓库地址
对于仓库首次拉取模块，可以使用：
git submodule update --init --recursive
# 更新单个子模块xxx
git...