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Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...ou will have typically have 1-8 cache locations for all of these. Thus almost all of those accesses will trigger an L1 cache eviction, and fetching of data from a slower cache or main memory.
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How can I shuffle the lines of a text file on the Unix command line or in a shell script?
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You can use shuf. On some systems at least (doesn't appear to be in POSIX).
As jleedev pointed out: sort -R might also be an option. On some systems at least; well, you get the picture. It has been pointed out that sort -R doesn't really shuffle but instead sort items according to their hash ...
How do I create a new class in IntelliJ without using the mouse?
......).
You can also do it from the Navigation Bar, press Alt+Home, then choose package with arrow keys, then press Alt+Insert.
Another useful shortcut is View | Select In (Alt+F1), Project (1), then Alt+Insert to create a class near the existing one or use arrow keys to navigate through the package...
Python Requests and persistent sessions
...ests.Session()
After that, continue with your requests as you would:
s.post('https://localhost/login.py', login_data)
#logged in! cookies saved for future requests.
r2 = s.get('https://localhost/profile_data.json', ...)
#cookies sent automatically!
#do whatever, s will keep your cookies intact :)...
How does @synchronized lock/unlock in Objective-C?
...m is more complex and uses recursive locks, but it should get the point across.
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Provisioning Profiles menu item missing from Xcode 5
After spending a whole day installing a fresh copy of Mac OS X v10.8 (Mountain Lion), Xcode 5, fixing provisioning profiles, certificates, creating new ones, I finally managed to get my applications running on my iPad again. The problem is that in Xcode 5 I don't have a menu item for Library ...
In Docker, what's the difference between a container and an image? [duplicate]
...ated an instance from a Ubuntu image. So this Ubuntu is what people call "Host OS"? Let's say my system is running on CentOS. That's not the Host OS, correct? Also, will each container take copy of the Ubuntu image? I'm guessing no copy will be created because it will be heavy just like VMs.
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How can I read a whole file into a string variable
...buf := bytes.NewBuffer(nil)
for _, filename := range filenames {
f, _ := os.Open(filename) // Error handling elided for brevity.
io.Copy(buf, f) // Error handling elided for brevity.
f.Close()
}
s := string(buf.Bytes())
This opens each file, copies its contents into buf, then close...
Process escape sequences in a string in Python
...))
UnicodeEncodeError: 'latin-1' codec can't encode character '\u0151'
in position 3: ordinal not in range(256)
Adding a regular expression to solve the problem
(Surprisingly, we do not now have two problems.)
What we need to do is only apply the unicode_escape decoder to things that we are cert...
How do I run a node.js app as a background service?
Since this post has gotten a lot of attention over the years, I've listed the top solutions per platform at the bottom of this post.
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