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Is “IF” expensive?
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At the very lowest level (in the hardware), yes, ifs are expensive. In order to understand why, you have to understand how pipelines work.
The current instruction to be executed is stored in something typically called the instruction pointer (IP) or program counter (PC); these terms are synonym...
AWS Difference between a snapshot and AMI
... of specific EBS volume, it might be any volume (Root volume, data volume, etc.)
AMI (Amazon Machine Image) is a backup of Entire EC2 instance. For example, with proper configuration it's possible to create AMI which includes multiple EBS volumes.
Now, it might sound confusing, but they are both s...
How to increase the vertical split window size in Vim
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Another tip from my side:
In order to set the window's width to let's say exactly 80 columns, use
80 CTRL+W |
In order to set it to maximum width, just omit the preceding number:
CTRL+W |
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How to use sidebar with the keyboard in Sublime Text 2 and 3?
...trl + b will show/hide the sidebar. Make sure you hit K and B in the right order
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How to get first N elements of a list in C#?
...ften it's convenient to get the first five items according to some kind of order:
var firstFiveArrivals = myList.OrderBy(i => i.ArrivalTime).Take(5);
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Remove a JSON attribute [duplicate]
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@ggb667 you don't need to. Ordering doesn't matter for a JSON object. Without getting too deep in my explanation, it's like a Dictionary (or Map). Order matters if you are dealing with an array that contains objects or other values, since they don't ha...
Does Django scale? [closed]
...mance improvements, ordinary database design and implementation (indexing, etc.), ordinary firewall performance improvements, etc.
What we do measure is our load test laptops struggling under the insane workload of 15 processes running 16 concurrent threads of requests.
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Why does modern Perl avoid UTF-8 by default?
...gs a whole lot more than I think you have.
As just one example, canonical ordering is going to cause some real headaches. ????"\x{F5}" ‘õ’, "o\x{303}" ‘õ’, "o\x{303}\x{304}" ‘ȭ’, and "o\x{304}\x{303}" ‘ō̃’ should all match ‘õ’, but how in the world are you going to do that...
'IF' in 'SELECT' statement - choose output value based on column values
...HEN 'South America'
ELSE 'Europe' END AS Continent
FROM Suppliers
ORDER BY CompanyName;
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scp or sftp copy multiple files with single command
... Does this work if my destination is root and I'm doing the etc directory like for example: scp -r /backups/etc root@linuxbox:/ where my source is a very sparse directory with things like "hosts" and nginx/sites-available etc ?
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