大约有 15,000 项符合查询结果（耗时：0.0504秒） [XML]
When NOT to use yield (return) [duplicate]
...results show how long it took (in milliseconds) to perform the operation 1,000,000 times. Smaller numbers are better.
In revisiting this, the performance difference isn't significant enough to worry about, so you should go with whatever is the easiest to read and maintain.
Update 2
I'm pretty sur...
Best way to display decimal without trailing zeroes
...g[] args)
{
var dList = new decimal[] { 20, 20.00m, 20.5m, 20.5000m, 20.125m, 20.12500m, 0.000m };
foreach (var d in dList)
Console.WriteLine(d.ToString("0.#####"));
}
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What's the “average” requests per second for a production web application?
...
OpenStreetMap seems to have 10-20 per second
Wikipedia seems to be 30000 to 70000 per second spread over 300 servers (100 to 200 requests per second per machine, most of which is caches)
Geograph is getting 7000 images per week (1 upload per 95 seconds)
...
How to find time complexity of an algorithm
... // O(1)
a = 10; // O(1)
a = 1.000.000.000.000.000.000 // O(1)
2 - If then else statement: Only taking the maximum running time from two or more possible statements.
Example:
age = read(x) // (1+1) = 2
if age < ...
PHP Fatal error: Cannot redeclare class
...y be a noticeable difference of about 1 second if you have a file with 100,000 include_once's. You would be better off optimizing your DB access or other logic than prematurely optimizing your file includes using substandard techniques like master include files. The autoload feature doesn't perfor...
Cosmic Rays: what is the probability they will affect a program?
...ors in the Wild: A Large-Scale Field Study" says that there can be up to 25000-75000 one-bit FIT per Mbit (failures in time per billion hours), which is equal to 1 - 5 bit errors per hour for 8GB of RAM after my calculations. Paper says the same: "mean correctable error rates of 2000–6000 per GB p...
Guid.NewGuid() vs. new Guid()
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new Guid() makes an "empty" all-0 guid (00000000-0000-0000-0000-000000000000 is not very useful).
Guid.NewGuid() makes an actual guid with a unique value, what you probably want.
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Two color borders
... just takes a little CSS trickery!
div.border {
border: 1px solid #000;
position: relative;
}
div.border:before {
position: absolute;
display: block;
content: '';
border: 1px solid red;
height: 100%;
width: 100%;
box-sizing: border-box;
-moz-box-sizing: border-...
Should I use a data.frame or a matrix?
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@Michal: Matrices aren't really more memory efficient:
m <- matrix(1:400000, 200000, 2)
d <- data.frame(m)
object.size(m)
# 1600200 bytes
object.size(d)
# 1600776 bytes
... unless you have a large number of columns:
m <- matrix(1:400000, 2, 200000)
d <- data.frame(m)
object.size(m)
...
What is the length of the access_token in Facebook OAuth2?
...requires an upper-bound on this. Please give a realistic upperbound. e.g. 1000 characters, 10,000 characters, 1,000,000,000 characters? Having no upper-bound is just unreasonable.
– Yahya Uddin
Feb 7 '17 at 14:36
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