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Apache Spark: The number of cores vs. the number of executors
I'm trying to understand the relationship of the number of cores and the number of executors when running a Spark job on YARN.
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Legality of COW std::string implementation in C++11
It had been my understanding that copy-on-write is not a viable way to implement a conforming std::string in C++11, but when it came up in discussion recently I found myself unable to directly support that statement.
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Linking R and Julia?
Julia looks very promising for fast and syntax-sane computation (e.g. here ), but I suspect it will not be anywhere near R in terms of overall statistics workflow for some time yet. So I'd like to use it where C++ is mainly used in R programs: to optimize slow portions of code. Before I invest th...
Find if variable is divisible by 2
...if a variable is divisible by 2? Furthermore I need do a function if it is and do a different function if it is not.
12 Ans...
When would I need a SecureString in .NET?
...to the Swap file or in core dumps. The encryption is more like obfuscation and won't stop a determined hacker, though, who would be able to find the symmetric key used to encrypt and decrypt it.
As others have said, the reason you have to create a SecureString character-by-character is because of t...
Eclipse error “ADB server didn't ACK, failed to start daemon”
...Step 1:
CTRL+Shift+Esc to open the task manager, which has adb.exe process and end (kill) that process
Step 2:
Now, close the eclipse, which is currently running on my computer.
Step 3:
Again, restart eclipse then solved that problem.
For those using OS X
killall adb
For those using Windows
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Working with README.md on github.com [closed]
...st your Markdown documents.
Update 2012-11-08: Efforts are underway to standardize the Markdown syntax. See The Future of Markdown - Jeff Atwood, Coding Horror and W3C Markdown Community Group.
Update 2014-09-09: CommonMark a markdown standard and spec has been released.
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Passing variables in remote ssh command
I want to be able to run a command from my machine using ssh and pass through the environment variable $BUILD_NUMBER
7 Ans...
Twitter Bootstrap CSS affecting Google Maps
I'm using Twitter Bootstrap, and have a Google map.
11 Answers
11
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String vs. StringBuilder
I understand the difference between String and StringBuilder ( StringBuilder being mutable) but is there a large performance difference between the two?
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