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What is a memory fence?
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For performance gains modern CPUs often execute instructions out of order to make maximum use of the available silicon (including memory read/writes). Because the hardware enforces instructions integrity you never notice this in a single thread of execution. However for multiple threads or en...
How can I do DNS lookups in Python, including referring to /etc/hosts?
...l do my DNS lookups very nicely, but it entirely ignores the contents of /etc/hosts .
6 Answers
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Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)
...use), not by record number. Discussions are
increasingly infinite-scroll ordered by date (again allowing index
use), not by paginated by post number. And so on.
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Is there a way to 'uniq' by column?
...sort's manpage says: "-u, --unique with -c, check for strict ordering; without -c, output only the first of an equal run." So, it is indeed "the first occurrence of the duplicate before sorting."
– Geremia
Apr 15 '16 at 17:32
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logger configuration to log to file and print to stdout
... this module to also print the strings out to stdout. How do I do this? In order to log my strings to a file I use following code:
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Xcode 4.5 Storyboard 'Exit'
...ed view controller, as opposed to all the work you had to do previously in order to hand info back and forth (the stuff in the template with a delegate and a protocol, all of which can now be deleted).
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How do I run a spring boot executable jar in a Production environment?
...r use a systemd script.
init.d example:
$ln -s /var/yourapp/yourapp.jar /etc/init.d/yourapp
This allows you to start, stop and restart your application like:
$/etc/init.d/yourapp start|stop|restart
Or use a systemd script:
[Unit]
Description=yourapp
After=syslog.target
[Service]
ExecStart=/...
How to delete an item in a list if it exists?
...ing)
The removemethod will remove only the first occurrence of thing, in order to remove all occurrences you can use while instead of if.
while thing in some_list: some_list.remove(thing)
Simple enough, probably my choice.for small lists (can't resist one-liners)
2) Duck-typed, EAFP styl...
Shuffle an array with python, randomize array item order with python
What's the easiest way to shuffle an array with python?
11 Answers
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How to disable HTML links
...al" function (for example using knockoutjs) In that case the event handler ordering can cause some troubles. Hence I implemented disabled links by binding a return false handler to the link's touchstart, mousedown and keydown events. It has some drawbacks (it will prevent touch scrolling started on ...