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What is the difference between concurrency, parallelism and asynchronous methods?
...ay that parallel tasks should be truly multitasking, executed "at the same time" whereas concurrent could mean that the tasks are sharing the execution thread while still appearing to be executing in parallel.
Asynchronous methods aren't directly related to the previous two concepts, asynchrony is ...
How to find all combinations of coins when given some dollar value
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I looked into this once a long time ago, and you can read my little write-up on it. Here’s the Mathematica source.
By using generating functions, you can get a closed-form constant-time solution to the problem. Graham, Knuth, and Patashnik’s Concrete ...
How to debug Lock wait timeout exceeded on MySQL?
...in set, 1 warning (0.00 sec)
You should consider increasing the lock wait timeout value for InnoDB by setting the innodb_lock_wait_timeout, default is 50 sec
mysql> show variables like 'innodb_lock_wait_timeout';
+--------------------------+-------+
| Variable_name | Value |
+--------...
Extract substring using regexp in plain bash
I'm trying to extract the time from a string using bash, and I'm having a hard time figuring it out.
4 Answers
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tcp端口状态ESTABLISHED、TIME_WAIT、CLOSE_WAIT 、SYN_RECV等详解 - C/C++...
tcp端口状态ESTABLISHED、TIME_WAIT、CLOSE_WAIT 、SYN_RECV等详解TCP状态转移要点TCP协议规定，对于已经建立的连接，网络双方要进行四次握手才能成功断开连接，如果缺少了其中某个步骤，将会使连接处于假死 TCP状态转移要点
TCP协议...
What is the optimal Jewish toenail cutting algorithm?
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Randomly pick two different sequences. Remember which ones you used last time.
EDIT: If this isn't really about toes, but about some random problem where the set can be much larger than 5, the sequence space becomes very large and the chance of repeating the same sequence on the second foot beco...
How can I “pretty print” a Duration in Java?
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Joda Time has a pretty good way to do this using a PeriodFormatterBuilder.
Quick Win: PeriodFormat.getDefault().print(duration.toPeriod());
e.g.
//import org.joda.time.format.PeriodFormatter;
//import org.joda.time.format.Perio...
Is it possible to use argsort in descending order?
... elements:
avgDists.argsort()[::-1][:n]
Both methods are O(n log n) in time complexity, because the argsort call is the dominant term here. But the second approach has a nice advantage: it replaces an O(n) negation of the array with an O(1) slice. If you're working with small arrays inside loo...
Executing periodic actions in Python [duplicate]
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At the end of foo(), create a Timer which calls foo() itself after 10 seconds.
Because, Timer create a new thread to call foo().
You can do other stuff without being blocked.
import time, threading
def foo():
print(time.ctime())
threading.Timer(...
Sleeping in a batch file
...onds (usually in a test/wait loop, waiting for a process to start). At the time, the best solution I could find uses ping (I kid you not) to achieve the desired effect. I've found a better write-up of it here , which describes a callable "wait.bat", implemented as follows:
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