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记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
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接着使用strace跟踪了一下PHP脚本，发现进程卡在了recvfrom操作上：
shell> strace -f -r -p <PID>
recvfrom(<FD>,
通过如下命令查询recvfrom操作的含义：
shell> apropos recvfrom
receive a message from a socket
或者按照下面的方式确认一下：
shell...
Clearing purchases from iOS in-app purchase sandbox for a test user
...t you don't really have to verify your test user email. you can simply put 123@123.com with specify password(that you are still going to use the password in sandbox mode) and it still work. I just tested last night.
– sooon
May 1 '14 at 12:24
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How do I create a URL shortener?
...on f. This is necessary so that you can find a inverse function g('abc') = 123 for your f(123) = 'abc' function. This means:
There must be no x1, x2 (with x1 ≠ x2) that will make f(x1) = f(x2),
and for every y you must be able to find an x so that f(x) = y.
How to convert the ID to a shortened...
JavaScript equivalent of jQuery's extend method
...42,
prop3: true,
prop4: 20.16,
};
const obj2 = {
prop4: 77.123,
propNew1: 'newVal1',
propNew2: 71,
};
assert.deepEqual(utils.extend(obj1, obj2), {
prop1: 'val1',
prop2: 42,
prop3: true,
prop4: 77.123,
propNew1: 'newVal1',
propNew2: 71,
});
});
i...
Get css top value as number not as string?
...css(prop)) || 0;
};
Usage:
$('#elem').cssInt('top'); // e.g. returns 123 as an int
$('#elem').cssFloat('top'); // e.g. Returns 123.45 as a float
Test fiddle on http://jsfiddle.net/TrueBlueAussie/E5LTu/
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常用快速产品原型设计工具推荐 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...和工具。它基于Adobe Air，能够流畅的在不同浏览器，不同操作系统平台下完美运行，可以在线使用，亦可以离线使用，能够很顺利地将其安装在Windows 7、FreeBSD、Ubuntu等平台中，高效率地完成每个原型设计任务。
产品原型设计软...
Logstash实践: 分布式系统的日志监控 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...rep命令。一方面这很被动。另一方面，效率非常低，数次操作下来，程序员的心情也会变糟（我还要去维护宇宙和平的好嘛）。
这篇文章讲的就是如何解决分布式系统的日志管理问题。先给大家看看最终的效果：
单个屏幕上...
JAVA线程池管理及分布式HADOOP调度框架搭建 - 人工智能(AI) - 清泛IT社区，...
...没有优先级的就等待执行。这三种算法都有优缺点，实际操作系统是结合多种算法，保证优先级的能够先处理，但是也不能一直处理优先级的任务。硬件方面为了提高效率也有多核cpu、多线程cpu等解决方案。目前看得出来线程增...
Why can't C# interfaces contain fields?
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How can I define a constant default value (like 123) to that automatic implementation of Year?
– lama12345
Aug 1 '17 at 1:39
1
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Is there any particular difference between intval and casting to int - `(int) X`?
...ould be used as a second parameter (base 10 by default) :
var_dump((int)"0123", intval("0123"), intval("0123", 8));
will get you :
int 123
int 123
int 83
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