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bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...过滤条件，则只能探测每次read()调用的结束时间，而不是now-start。
delete(@start[tid]): 释放变量。.
8. 统计进程级别的事件
# bpftrace -e 'tracepoint:sched:sched* { @[probe] = count(); } interval:s:5 { exit(); }'
Attaching 25 probes...
@[tracepoint:sched:s...
demystify Flask app.secret_key
... the browser:
( 1 ) First a SECRET_KEY is established. It should only be known to the application and should be kept relatively constant during the application's life cycle, including through application restarts.
# choose a salt, a secret string of bytes
>>> SECRET_KEY = 'my super secret...
How are 3D games so efficient? [closed]
...
Eeeeek!
I know that this question is old, but its exciting that no one has mentioned VSync!!!???
You compared the CPU usage of the game at 60fps to CPU usage of the teapot demo at 60fps.
Isn't it apparent, that both run (more or less)...
Ruby off the rails
...imple script may often still be written directly for sh(1), a complex task now might be done in Ruby rather than Perl.
share
edited
Functional programming - is immutability expensive? [closed]
...ing, let’s consider this reference implementation in Haskell (I don’t know Scala …) from the Haskell introduction:
qsort [] = []
qsort (x:xs) = qsort lesser ++ [x] ++ qsort greater
where lesser = (filter (< x) xs)
greater = (filter (>= x) xs)
The first disadvantage...
NumPy: function for simultaneous max() and min()
...tine minmax2
Compile it via:
f2py -m untitled -c fortran_code.f90
And now we're in a place where we can test it:
import timeit
size = 100000
repeat = 10000
print timeit.timeit(
'np.min(a); np.max(a)',
setup='import numpy as np; a = np.arange(%d, dtype=np.float32)' % size,
number=...
How to make an OpenGL rendering context with transparent background?
...
I know this is possible with Windows 7, not sure about earlier versions.
To get rid of the window border you need to remove the WS_OVERLAPPEDWINDOW style from the window and add the WS_POPUP style:
DWORD style = ::GetWindowLon...
Auto Scale TextView Text to Fit within Bounds
...for Android and is marked as winner.
UPDATE 2: Support of maxlines added, now works fine before API level 16.
Update 3: Support for android:drawableLeft, android:drawableRight, android:drawableTop and android:drawableBottom tags added, thanks to MartinH's simple fix here.
My requirements were l...
In what order are Panels the most efficient in terms of render time and performance?
... when more than one panel would suitable for the layout I want, however I know there is a difference in render times for different panel types.
...
Log exception with traceback
...except:
logging.exception('Got exception on main handler')
raise
Now looking at the log file, /tmp/logging_example.out:
DEBUG:root:This message should go to the log file
ERROR:root:Got exception on main handler
Traceback (most recent call last):
File "/tmp/teste.py", line 9, in <modu...