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What does Docker add to lxc-tools (the userspace LXC tools)?
...
Provided with plain LXC.
2) Resource isolation: system resources like cpu and memory can be allocated differently to each process container, using cgroups.
Provided with plain LXC.
3) Network isolation: each process container runs in its own network namespace, with a virtual interface and...
Android destroying activities, killing processes
... persistent data, stop animations and other things that may be
consuming CPU, etc. Implementations of this method must be very quick
because the next activity will not be resumed until this method
returns. Followed by either onResume() if the activity returns back to
the front, or onStop() i...
What is an uninterruptible process?
... no non-sleeping process, it switches to a "dummy" process which tells the cpu to slow down a bit and sits in a loop — the idle loop).
If a signal is sent to a sleeping process, it has to be woken up before it will return to user space and thus process the pending signal. Here we have the differe...
Load and execution sequence of a web page?
...llision that causes a code crash.
Of the above steps the one that is most CPU intensive is the parsing of the DOM/CSS. If you want your page to be processed faster then write efficient CSS by eliminating redundent instructions and consolidating CSS instructions into the fewest possible element ref...
Evaluating a mathematical expression in a string
...rbitrary commands
eval("9**9**9**9**9**9**9**9", {'__builtins__': None}) # CPU, memory
Note: even if you use set __builtins__ to None it still might be possible to break out using introspection:
eval('(1).__class__.__bases__[0].__subclasses__()', {'__builtins__': None})
Evaluate arithmetic expr...
What does it mean to hydrate an object?
... for your current operations. So there's no reason to waste bandwidth and CPU cycles loading, transferring, and setting this data when it's not going to be used.
Additionally, there are some ORM's, such as Doctrine, which do not hydrate objects when they are instantiated, but only when the data is...
How do I replace NA values with zeros in an R dataframe?
...am running these tests on fully numeric dataframes.
Hardware Used
3.9 GHz CPU with 24 GB RAM
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How can I repeat a character in Bash?
...llowing are timings taken on a late-2012 iMac with a 3.2 GHz Intel Core i5 CPU and a Fusion Drive, running OSX 10.10.4 and bash 3.2.57, and are the average of 1000 runs.
The entries are:
listed in ascending order of execution duration (fastest first)
prefixed with:
M ... a potentially multi-cha...
Why is lock(this) {…} bad?
...t deciding what to lock. Be aware that taking a lock involves cache-flush CPU operations and is somewhat expensive. In other words: do not lock and update each individual integer. :)
– Zan Lynx
Oct 31 '08 at 0:12
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Java HashMap performance optimization / alternative
...hat does this accomplish? Adding a constant to every hash value just burns cpu cycles without accomplishing anything useful. Lesson here: Adding complexity to a hash function is not the goal. The goal is to get a broad range of different values, not just to add complexity for the sake of complexity....