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How do I measure separate CPU core usage for a process?
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Bojin Li
5,51322 gold badges2020 silver badges3333 bronze badges
answered Oct 11 '10 at 21:45
abdollarabdollar
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How to profile a bash shell script slow startup?
... you'd like to begin a trace in any Bash script):
PS4='+ $(date "+%s.%N")\011 '
exec 3>&2 2>/tmp/bashstart.$$.log
set -x
add
set +x
exec 2>&3 3>&-
at the end of ~/.bashrc (or at the end of the section of any Bash script you'd like tracing to stop). The \011 is an octal ...
Are +0 and -0 the same?
Reading through the ECMAScript 5.1 specification , +0 and -0 are distinguished.
9 Answers
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Swift Beta performance: sorting arrays
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tl;dr Swift 1.0 is now as fast as C by this benchmark using the default release optimisation level [-O].
Here is an in-place quicksort in Swift Beta:
func quicksort_swift(inout a:CInt[], start:Int, end:Int) {
if (end - start < 2...
Adding new column to existing DataFrame in Python pandas
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1091
Use the original df1 indexes to create the series:
df1['e'] = pd.Series(np.random.randn(sLeng...
Check if at least two out of three booleans are true
...the real world :)
– Juliet
Jun 19 '10 at 16:02
124
@Juliet: I don't know, I think if this was a r...
What killed my process and why?
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answered Apr 7 '09 at 17:23
dwcdwc
20.8k55 gold badges3939 silver badges5252 bronze badges
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What's the difference between tilde(~) and caret(^) in package.json?
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4053
See the NPM docs and semver docs:
~version “Approximately equivalent to version”, will up...
How to assign string to bytes array
...ices in Go is using a slice of bytes []byte and not a set array of bytes [20]byte when converting a string to bytes... Don't believe me? Check out Rob Pike's answer on this thread
– openwonk
Feb 14 '16 at 0:44
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What are bitwise operators?
...t's own bit in a bitset (byte, short, int, or long). For example:
Read: 00000001
Write: 00000010
So if you want to pass read AND write, you would pass (READ | WRITE) which then combines the two into
00000011
Which then can be decrypted on the other end like:
if ((flag & Read) != 0) { /...