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What is causing “Unable to allocate memory for pool” in PHP?
...accessed all of the time like you want and have a big spike where a lot of extra infrequent files get added all at once), you are going to get errors thrown for TTL seconds. The cache is full, and you told APC that it shouldn't clear these entries so it complains. If you have TTL for 5 hours, you en...
Creating an instance of class
... new Bar ( Foo::Foo() ); is not usual. It's usually new Bar ( (Foo()) ); - extra parenthesis account for most-vexing parse. (corrected)
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print call stack in C or C++
...tdio.h>
#include <execinfo.h>
void print_trace(void) {
char **strings;
size_t i, size;
enum Constexpr { MAX_SIZE = 1024 };
void *array[MAX_SIZE];
size = backtrace(array, MAX_SIZE);
strings = backtrace_symbols(array, size);
for (i = 0; i < size; i++)
pr...
Does Redis persist data?
...operation can only be performed if you have enough free RAM (the amount of extra RAM is equal to the size of redis DB)
N.B.: BGSAVE RAM requirement is a real problem, because redis continues to work up until there is no more RAM to run in, but it stops saving data to HDD much earlier (at approx. ...
When to use pip requirements file versus install_requires in setup.py?
...
yeah this worked for me until a critical --extra-index-url in in the requirements was required and this blew up in my face. Thanks @RomainHardouin
– Tommy
Feb 8 '16 at 20:10
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Why are my balls disappearing? [closed]
...tyX);
ball2.nextY = (ball2.nextY += ball2.velocityY);
You don't need the extra assignments, and can just use the += operator alone:
ball1.nextX += ball1.velocityX;
ball1.nextY += ball1.velocityY;
ball2.nextX += ball2.velocityX;
ball2.nextY += ball2.velocityY;
...
Should I use “hasClass” before “addClass”? [duplicate]
...l because jQuery will also always check from within .addClass(). It's just extra work.
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How do I enable TODO/FIXME/XXX task tags in Eclipse?
...uld be enough to have them appear in the Task list (or the Markers view).
Extra note: reinstalling Eclipse won't change anything most of the time if you work on the same workspace. Most settings used by Eclipse are stored in the .metadata folder, in your workspace folder.
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How does Django's Meta class work?
I am using Django which allows people to add extra parameters to a class by using class Meta .
6 Answers
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Need to understand the usage of SemaphoreSlim
...n (i.e., no FIFO priorities).
When a teacher is around, she "releases" an extra row of 5 footprints on the other side of the corridor such that 5 more kids can play in the room at the same time.
It also has the same "pitfalls" of SemaphoreSlim...
If a kid finishes playing and leaves the room with...