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ActiveMQ or RabbitMQ or ZeroMQ or [closed]
...oducts:
have client apis for the most common languages (C++, Java, .Net, Python, Php, Ruby, …)
have strong documentation
are actively supported
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Select first row in each GROUP BY group?
...ates the need for more:
Configuration parameter work_mem in PostgreSQL on Linux
Optimize simple query using ORDER BY date and text
For many rows per customer (low cardinality in column customer), a loose index scan (a.k.a. "skip scan") would be (much) more efficient, but that's not implemented up ...
Difference between filter and filter_by in SQLAlchemy
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filter_by uses keyword arguments, whereas filter allows pythonic filtering arguments like filter(User.name=="john")
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Is gcc 4.8 or earlier buggy about regular expressions?
...ersion
clang version 3.9.0 (tags/RELEASE_390/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
$ ./a.out # compiled with 'clang -lstdc++'
<regex> works, look: true
Here be Dragons
This is totally unsupported and relies on the detection of private macros t...
Matplotlib scatterplot; colour as a function of a third variable
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How to find a Java Memory Leak
... to your application classes. This will give a pretty good hint. Here is a pythons script that can help you compare two jmap histogram dumps. histogramparser.py
Finally tools like JConolse and VisualVm are essential to see the memory growth over time, and see if there is a memory leak. Finally som...
Difference between web reference and service reference?
... only ASMX, but Web References can also talk to Java-based Web Services or Python-based or Ruby so long as they all talk WSDL and conform to the WS-I interoperability standard).
A Service Reference will create a client proxy class that communicates with a WCF-based service : regardless of whether t...
Vagrant reverse port forwarding?
...ning on port 8000 on your host machine...
echo 'Hello, guest!' > hello
python -m SimpleHTTPServer 8000
You can access it from inside the Vagrant VM at 10.0.2.2:8000 (provided 10.0.2.2 is the ip of the guest's default gateway):
vagrant ssh
curl http://10.0.2.2:8000/hello # Outputs: Hello, gues...
Can't escape the backslash with regex?
...t parse escape sequences to avoid having to use as many - for instance, in Python:
re.compile(r'\\')
The r in front of the quotes makes it a raw string which doesn't parse backslash escapes.
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Using OR in SQLAlchemy
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