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动态追踪（Dynamic Tracing）技术漫谈 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...我估计这是因为他当时将之应用于多线程的程序，比如 MySQL，而多线程的程序因为线程同步方面的原因，off-CPU 图上会有很多噪音，容易掩盖真正有趣的那些部分。而我应用 off-CPU 火焰图的场景是像 Nginx 这样的单线程程序，所以...
A semantics for Bash scripts?
...(much of the shell's arithmetic syntax semantics comes from C).
The other root of the shell's syntax comes from its upbringing as a mishmash of individual UNIX utilities. Most of what are often builtins in the shell can actually be implemented as external commands. It throws many shell neophytes fo...
What is an intuitive explanation of the Expectation Maximization technique? [closed]
...n.
This is the estimate of the variance, take the positive square
root to find the standard deviation.
"""
variance = np.sum(weight * (data - mean)**2) / np.sum(weight)
return np.sqrt(variance)
# new estimates for standard deviation
blue_std_guess = estimate_std(both_colours, b...
Does PHP have threading?
... folder ([phpDirectory]/ext).
Copy pthreadVC2.dll into [phpDirectory] (the root folder - not the extension folder).
Edit [phpDirectory]/php.ini and insert the following line
extension=php_pthreads.dll
Test it with the script above with some sleep or something right there where the comment is.
An...
Multiple glibc libraries on a single host
..., not all is lost, but it gets trickier. One solution is to set a proper chroot environment for it. Another possibility is to use rtldi and a binary editor.
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What is an existential type?
...ction height which returns the furthest distance from any leaf node to the root node t.
Now, let's turn the above pseudo-code for height into proper Java syntax! (I'll keep on omitting some boilerplate for brevity's sake, such as object-orientation and accessibility modifiers.) I'm going to show t...
What is a NullReferenceException, and how do I fix it?
...se at once. Note: It does not matter which data provider you are using -- MySQL, SQL Server, OleDB, etc. -- the concepts are the same.
Example 1
Dim da As OleDbDataAdapter
Dim ds As DataSet
Dim MaxRows As Integer
con.Open()
Dim sql = "SELECT * FROM tblfoobar_List"
da = New OleDbDataAdapter(sql, co...
Google Maps Android API v2 - Interactive InfoWindow (like in original android google maps)
...where in your activity/fragment. Mine is within fragment. Also insure that root view in your infowindow layout is linearlayout (for some reason relativelayout was taking full width of screen in infowindow)
infoWindow = (ViewGroup) getActivity().getLayoutInflater().inflate(R.layout.info_window, null...
What is a NullPointerException, and how do I fix it?
...y JVM Dynamically
Now Java 14 has added a new language feature to show the root cause of NullPointerException. This language feature has been part of SAP commercial JVM since 2006. The following is 2 minutes read to understand this amazing language feature.
https://jfeatures.com/blog/NullPointerExce...
Using Java with Nvidia GPUs (CUDA)
...be executed in parallel, using a Thread Pool.
https://github.com/pcpratts/rootbeer1 : An open-source library for converting parts of Java into CUDA programs. It offers dedicated interfaces that may be implemented to indicate that a certain class should be executed on the GPU. In contrast to Aparapi...