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ByteBuffer.allocate() vs. ByteBuffer.allocateDirect()
...ually the
best choice for I/O operations. By
design, they support the most
efficient I/O mechanism available to
the JVM. Nondirect byte buffers can be
passed to channels, but doing so may
incur a performance penalty. It's
usually not possible for a nondirect
buffer to be the target o...
Why are elementwise additions much faster in separate loops than in a combined loop?
Suppose a1 , b1 , c1 , and d1 point to heap memory and my numerical code has the following core loop.
10 Answers
...
How to assign a Git SHA1's to a file without Git?
...ding.ASCII.GetBytes
|> (new System.Security.Cryptography.SHA1CryptoServiceProvider()).ComputeHash
|> Array.fold (fun acc e ->
let t = System.Convert.ToString(e, 16)
if t.Length = 1 then acc + "0" + t else acc + t)
""
/// Calculates the SHA1 lik...
Invalid default value for 'create_date' timestamp field
...
Using OS X, install mysql from Homebrew, System Variables based on its compiled-in defaults.
Solution is to remove "NO_ZERO_DATE" from System Variables "sql_mode".
Just please keep in mind that scope involve.
If you want to affe...
How to install the current version of Go in Ubuntu Precise
...
sudo apt-get install python-software-properties # 12.04
sudo add-apt-repository ppa:duh/golang
sudo apt-get update
sudo apt-get install golang
To confirm:
go version
which outputs in my case (Ubuntu precise)
go version go1.1.1 linux/amd64
From there just export the settings you're gonna n...
How to split a file into equal parts, without breaking individual lines? [duplicate]
I was wondering if it was possible to split a file into equal parts ( edit: = all equal except for the last), without breaking the line? Using the split command in Unix, lines may be broken in half. Is there a way to, say, split up a file in 5 equal parts, but have it still only consist of whole li...
Can't install RMagick 2.13.1. Can't find MagickWand.h.
...tps://superuser.com/questions/361435/i-have-compiled-imagemagick-on-my-centos-and-rmagick-wont-install
I exported the imagemagick path by adding
$ export PKG_CONFIG_PATH="/opt/local/lib/pkgconfig:$PKG_CONFIG_PATH"
to my ~/.bash_profile, sourcing the new profile, then running:
gem install rmagic...
Is calculating an MD5 hash less CPU intensive than SHA family functions?
...w 60 MB/s. Even though SHA-256 appears "slow" here, it is fast enough for most purposes.
Note that OpenSSL includes a 32-bit implementation of SHA-512 which is quite faster than my code (but not as fast as the 64-bit SHA-512), because the OpenSSL implementation is in assembly and uses SSE2 register...
What's the best visual merge tool for Git? [closed]
...
Meld is a free, open-source, and cross-platform (UNIX/Linux, OSX, Windows) diff/merge tool.
Here's how to install it on:
Ubuntu
Mac
Windows: "The recommended version of Meld for Windows is the most recent release, available as an MSI from https://meldmerge....
How can I beautify JavaScript code using Command Line?
...ything, place js.jar in your Java classpath (or Library/Java/Extensions on OS X). You can then run scripts with an invocation similar to this
java -cp js.jar org.mozilla.javascript.tools.shell.Main name-of-script.js
Use the Pretty Print/Beautifier from step 1 to write a small shell script that ...