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高并发服务端分布式系统设计概要 - C/C++ - 清泛网 - 专注C/C++及内核技术
...好了，现在我们的“山推”系统设计完成了，但是要将它编码实现，还有很远的路要走，细枝末节的问题也会暴露更多。如果该系统用于线上计算，如有大量的Map-Reduce运行于group中，系统将会更复杂，因为此时不光考虑的数据的...
Real differences between “java -server” and “java -client”?
...tions. These two solutions share the Java HotSpot runtime environment code base, but use different compilers that are suited to the distinctly unique performance characteristics of clients and servers. These differences include the compilation inlining policy and heap defaults.
Although the Server a...
How to write a large buffer into a binary file in C++, fast?
...
std::vector<uint64_t> data = GenerateData(bytes);
std::ios_base::sync_with_stdio(false);
auto startTime = std::chrono::high_resolution_clock::now();
auto myfile = std::fstream("file.binary", std::ios::out | std::ios::binary);
myfile.write((char*)&data[0], bytes);
...
Converting between datetime, Timestamp and datetime64
How do I convert a numpy.datetime64 object to a datetime.datetime (or Timestamp )?
12 Answers
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node.js hash string?
...a) {
return crypto.createHash("sha256").update(data, "binary").digest("base64");
// ------ binary: hash the byte string
}
sha256("string or binary");
Documentation:
crypto.createHash(algorithm[, options]): The algorithm is dependent on the av...
How to use OpenSSL to encrypt/decrypt files?
... enc -ciphername [-in filename] [-out filename] [-pass arg]
[-e] [-d] [-a/-base64] [-A] [-k password] [-kfile filename]
[-K key] [-iv IV] [-S salt] [-salt] [-nosalt] [-z] [-md] [-p] [-P]
[-bufsize number] [-nopad] [-debug] [-none] [-engine id]
Explanation of most useful parameters with regards t...
What column type/length should I use for storing a Bcrypt hashed password in a Database?
I want to store a hashed password (using BCrypt) in a database. What would be a good type for this, and which would be the correct length? Are passwords hashed with BCrypt always of same length?
...
Is gcc std::unordered_map implementation slow? If so - why?
...ng the code on GCC.
My answer is just to establish some kind of knowledge base to other answers.
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How do you calculate log base 2 in Java for integers?
I use the following function to calculate log base 2 for integers:
10 Answers
10
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Retrieve list of tasks in a queue in Celery
...'re using Redis. To get the task counts:
redis-cli -h HOST -p PORT -n DATABASE_NUMBER llen QUEUE_NAME
But, prioritized tasks use a different key in redis, so the full picture is slightly more complicated. The full picture is that you need to query redis for every priority of task. In python (and ...