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Linux bpftrace学习笔记（持续更新） - 操作系统(内核) - 清泛网移动版 - ...
...ale/en_US.utf8/LC_CTYPE
tail /usr/lib64/gconv/gconv-modules.cache
[...]
2、列出与open系统调用相关的跟踪点函数名：
# bpftrace -l 'tracepoint:syscalls:sys_enter_open*'
tracepoint:syscalls:sys_enter_open_by_handle_at
tracepoint:syscalls:sys_enter_open
tracepoint:syscalls:sys_...
How do I read a text file of about 2 GB? [duplicate]
I have a .txt file whose memory is more than 2 GB. The problem is I cannot open it with Notepad, Notepad++ or any other editor programs.
...
Peak-finding algorithm for Python/SciPy
... matplotlib.pyplot as plt
from scipy.signal import find_peaks
x = np.sin(2*np.pi*(2**np.linspace(2,10,1000))*np.arange(1000)/48000) + np.random.normal(0, 1, 1000) * 0.15
peaks, _ = find_peaks(x, distance=20)
peaks2, _ = find_peaks(x, prominence=1) # BEST!
peaks3, _ = find_peaks(x, width=20)
p...
'uint32_t' identifier not found error
...Wikipedia page on the header, it hasn't shipped with Visual Studio until VS2010.
In the meantime, you could probably fake up your own version of the header by adding typedefs that map Microsoft's custom integer types to the types expected by C. For example:
typedef __int32 int32_t;
typedef unsign...
How to access the ith column of a NumPy multidimensional array?
...
724
>>> test[:,0]
array([1, 3, 5])
Similarly,
>>> test[1,:]
array([3, 4])
l...
Can't update Macports (with Mac OS X Mavericks)
...
282
Install the "Command Line Tools" first:
sudo xcode-select --install
(Explicitly agreeing to...
Python timedelta in years
...lace(year=from_date.year - years)
except ValueError:
# Must be 2/29!
assert from_date.month == 2 and from_date.day == 29 # can be removed
return from_date.replace(month=2, day=28,
year=from_date.year-years)
If it's 2/29, and 18 years ago...
Static variables in member functions
...etime of i will remain through out the program. To add an example:
A o1, o2, o3;
o1.foo(); // i = 1
o2.foo(); // i = 2
o3.foo(); // i = 3
o1.foo(); // i = 4
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Are there any standard exit status codes in Linux?
...f the killing signal are mixed into a single value on the return from wait(2) & co..
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <signal.h>
int main() {
int status;
pid_t child = f...
HTML5 Pre-resize images before uploading
...e.target.result}
reader.readAsDataURL(file);
var ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0);
var MAX_WIDTH = 800;
var MAX_HEIGHT = 600;
var width = img.width;
var height = img.height;
if (width > height) {
if (width > MAX_WIDTH) {
height *= MAX_WIDTH / width;
width = ...