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Python 3: ImportError “No Module named Setuptools”
...ols. Some Python packages used to use distutils for distribution, but most now use setuptools, a more complete package. Here is a question about the differences between them.
To install setuptools on Debian:
sudo apt-get install python3-setuptools
For an older version of Python (Python 2.x):
su...
(13: Permission denied) while connecting to upstream:[nginx]
...onf
Change ownership to user.
sudo chown -R nginx:nginx /var/lib/nginx
Now see the magic.
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Virtual Memory Usage from Java under Linux, too much memory used
...te segment that contains global per-process data for the library (I don't know what the segment with no permissions is; I've only seen it on x64 Linux). The read-only portion of the library can be shared between all processes that use the library; for example, libc has 1.5M of virtual memory space t...
Is “IF” expensive?
... what exactly our teacher said that day and I'm hoping you would probably know.
16 Answers
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Context switches much slower in new linux kernels
...om intel_idle to acpi_idle with just the first boot option, please let me know if the second option, processor.max_cstate did what it was documented to do in the comments so that I can update this answer.
Finally, the last of the three parameters, idle=poll is a real power hog. It will disable C1/C...
UICollectionView Set number of columns
I just started learning about UICollectionViews. I'm wondering if anyone knows how to specify the number of columns in a collectionview. The default is set to 3 (iPhone/portrait). I've looked at the documentation and can't seem to find a concise answer.
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What is the garbage collector in Java?
...ated in the previous iteration is not being used anymore -- that object is now considered "garbage".
Eventually, we'll start getting a lot of garbage, and memory will be used for objects which aren't being used anymore. If this keeps going on, eventually the Java Virtual Machine will run out of spa...
How can I make a JPA OneToOne relation lazy
...t bytecode instrumentation. The reason for this is that owner entity MUST know whether association property should contain a proxy object or NULL and it can't determine that by looking at its base table's columns due to one-to-one normally being mapped via shared PK, so it has to be eagerly fetched ...
PHP parse/syntax errors; and how to solve them
...d all that other time wasting crap, when I'm just hoping for a quick edit. Now, if you're developing new features or starting from scratch, then, yes, do it in an IDE. You won't regret taking that bit of extra time at the start to set it up.
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Mar 6 '17...
How to use OpenSSL to encrypt/decrypt files?
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NOTE: PBKDF2 is now part of the openssl enc (finally). However the iteration count is extrememly low, and needs to be set to a much higher level. If that count is randomised, then you also get a extra level of 'saltiness' to your encryption...