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Redis 的性能幻想与残酷现实 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...久化需要。
- buffer：用作缓冲区，平滑后端数据库的写操作，根据数据重要性可能有持久化需求。
- db：替代数据库的用法，有持久化需求。
规避在单实例上放热点 key。
同一系统下的不同子应用或服务使用的 Redis 也要隔离...
Making the Android emulator run faster
...add: -qemu -m 512 -enable-kvm (click Run)
P.S. For Fedora, for Ubuntu
OS-X:
In Android SDK Manager, install Intel x86 Atom System Image
In Android SDK Manager, install Intel x86 Emulator Accelerator (HAXM)
In finder, go to the install location of the Intel Emulator Accelerator and install Int...
How to use subprocess popen Python
Since os.popen is being replaced by subprocess.popen, I was wondering how would I convert
3 Answers
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Why are dates calculated from January 1st, 1970?
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It is the standard of Unix time.
Unix time, or POSIX time, is a system for describing points in time, defined as the number of seconds elapsed since midnight proleptic Coordinated Universal Time (UTC) of January 1, 1970, not counting leap seconds.
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How do I run a node.js app as a background service?
Since this post has gotten a lot of attention over the years, I've listed the top solutions per platform at the bottom of this post.
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select、poll、epoll之间的区别总结[整理] - C/C++ - 清泛网 - 专注C/C++及内核技术
...般是读就绪或者写就绪），能够通知程序进行相应的读写操作。但select，poll，epoll本质上都是同步I/O，因为他们都需要在读写事件就绪后自己负责进行读写，也就是说这个读写过程是阻塞的，而异步I/O则无需自己负责进行读写，...
Daylight saving time and time zone best practices [closed]
...m UTC. Notice that UTC is also known as Zulu or Z time.)
If instead you choose to persist a time using a local time value, include the local time offset for this particular time from UTC (this offset may change throughout the year), such that the timestamp can later be interpreted unambiguously.
In...
Number of lines in a file in Java
...n (count == 0 && !empty) ? 1 : count;
} finally {
is.close();
}
}
EDIT, 9 1/2 years later: I have practically no java experience, but anyways I have tried to benchmark this code against the LineNumberReader solution below since it bothered me that nobody did it. It seems th...
“please check gdb is codesigned - see taskgated(8)” - How to get gdb installed with homebrew code si
I'm under osx 10.8.4 and have installed gdb 7.5.1 with homebrew (motivation get a new gdb with new features such as --with-python etc... )
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BSS段、数据段、代码段、堆与栈 剖析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...栈上分配空间。.bss 是不占用.exe 文件空间的，其内容由操作系统初始化（清零）；而.data 却需要占用，其内容由程序初始化，因此造成了上述情况。
【例二】
编译如下程序（test.cpp）：
#include <stdio.h>
#define LEN 1002000
int in...