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What is copy-on-write?
...ncurrency sorts of problems. In ZFS, for example, data blocks on disk are allocated copy-on-write; as long as there are no changes, you keep the original blocks; a change changed only the affected blocks. This means the minimum number of new blocks are allocated.
These changes are also usually im...
在 App Inventor 2 中使用图像 · App Inventor 2 中文网
...crashes[a] when they try to run it, with an error message like:
Failed to allocate a 25165836 byte allocation with 3395432 free bytes and 3MB until OOM
What’s happening here is that the app is is running out of memory (OOM). In the case of the message above, the phone is trying to allocate 25 m...
POST request send json data java HttpUrlConnection
...ey=AIzaSyAhONZJpMCBqCfQjFUj21cR2klf6JWbVSo"
+ "&access_token=" + access_token);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "appli...
How can I generate random alphanumeric strings?
...is unsuitable for anything security related, such as creating passwords or tokens. Use the RNGCryptoServiceProvider class if you need a strong random number generator.)
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How do I use NSTimer?
...stance variable hasn't been set to nil and the NSTimer instance has been deallocated, it will throw an exception).
Note also the point on Memory Management at the bottom of the article:
Because the run loop maintains the timer, from the perspective of memory management there's typically no need...
Are there any SHA-256 javascript implementations that are generally considered trustworthy?
... @Xenland All you're doing is creating a new password which is "token + password". All of the original problems still apply. For example, an attacker can replace the JavaScript with code to send them the token + password.
– Brendan Long
Nov 16 '16 at...
When would anyone use a union? Is it a remnant from the C-only days?
...te a heterogeneous collection of unrelated types which are not dynamically allocated (perhaps they are in-place constructed in a map, or members of an array).
And now, an example, with a UML class diagram:
The situation in plain English: an object of class A can have objects of any class among ...
What's the fastest way to read a text file line-by-line?
...n a 511 KB file), probably due to how String.Split is implemented. It also allocates an array for all the lines increasing the memory required compared to your solution.
using (var streamReader = File.OpenText(fileName)) {
var lines = streamReader.ReadToEnd().Split("\r\n".ToCharArray(), StringSpl...
SparseArray vs HashMap
...ypes, even though not all of them are publicly available.
Benefits are:
Allocation-free
No boxing
Drawbacks:
Generally slower, not indicated for large collections
They won't work in a non-Android project
HashMap can be replaced by the following:
SparseArray <Integer, Object>...
Performance - Date.now() vs Date.getTime()
...
Is this because Date(optional).getTime(); has to allocate space to get a new Date object before getting the current time?
– Charlie G
Sep 20 '12 at 17:07
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