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Boost.Asio的简单使用(Timer,Thread,Io_service类) - C/C++ - 清泛网 - 专注C/C++及内核技术
...建一个asio::ip::tcp::acceptor对象来监听新的连接.我们监听TCP端口13,IP版本为V4
tcp::acceptor acceptor(io_service, tcp::endpoint(tcp::v4(), 13));
这是一个iterative server,也就是说同一时间只能处理一个连接.建立一个socket来表示一个和客户...
MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...过MQTT over websocket来穿越防火墙，不需要开1883MQTT或8883MQTTS端口。三、MQTT发明人介绍Andrew Stanford-Clark拥有东英吉利大学计算机研究和数学学士学位，后来又获得了并行计算方向的博士学位。他于1991年加入IBM的“通信软件”小组。...
SQL Server: Make all UPPER case to Proper Case/Title Case
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All Upper Case and Some lower Ää Öö Üü Éé Øø Cc Ææ
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How to select rows from a DataFrame based on column values?
...imeit mask = df['A'].values == 'foo'
%timeit mask = df['A'] == 'foo'
5.84 µs ± 195 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
166 µs ± 4.45 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)
Evaluating the mask with the numpy array is ~ 30 times faster. This is pa...
Postfix发信的频率控制几个参数 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...果是一样.smtpd_client_connection_rate_limit是指连接到服务器25端口就开始计算,smtpd_client_message_rate_limit是发送邮件时计算.)
smtpd_client_recipient_rate_limit=10
rcpt to的频率控制,也就是说TO了多少个人.
smtpd_client_event_limit_exceptions = ${smtpd_client_...
How to calculate moving average using NumPy?
...an ± std. dev. of 7 runs, 1 loop each)
scipy.convolve :
1.07 ms ± 26.7 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)
scipy.convolve, edge handling :
4.68 ms ± 9.69 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
numpy.cumsum :
5.31 ms ± 5.11 µs per loop (mean ± s...
Set value for particular cell in pandas DataFrame using index
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In [18]: %timeit df.set_value('C', 'x', 10)
100000 loops, best of 3: 2.9 µs per loop
In [20]: %timeit df['x']['C'] = 10
100000 loops, best of 3: 6.31 µs per loop
In [81]: %timeit df.at['C', 'x'] = 10
100000 loops, best of 3: 9.2 µs per loop
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How can I get list of values from dict?
... ± std. dev. of 7 runs, 1000000 loops each)
Big Dict(str)
17.5 ms ± 142 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
16.5 ms ± 338 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
16.2 ms ± 19.7 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
Big Dict(float)
...
笨法玩电商网站秒杀 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...接的话，10G内存就没有了；另一方面大量的连接可能耗尽端口资源，具体取决于内核参数「net.ipv4.ip_local_port_range」。此时提高处理队列的速度是唯一的出路。
请求合并
把类似的请求合并起来是一件既简单又复杂的事情，介于...