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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...
Django templates: verbose version of a choice
...
yes, I know. It's not as general (universal), though - unless you know a way to iterate in a template over all get_FOO_display methods of a model object :) I'm a bit too lazy for writing non-generic templates ;) Moreover, the docs ...
Check if PHP session has already started
... really think about refactoring your session management code if you don't know whether or not a session is started...
That said, my opinion is subjective, and there are situations (examples of which are described in the comments below) where it may not be possible to know if the session is started....
Removing duplicates from a list of lists
...l names local to each function for speed) to put things on equal footing.
Now we can run checks on the tiny example list:
$ python -mtimeit -s'import nodup' 'nodup.doset(nodup.k)'
100000 loops, best of 3: 11.7 usec per loop
$ python -mtimeit -s'import nodup' 'nodup.dosort(nodup.k)'
100000 loops, b...
Check orientation on Android phone
...g ALWAYS. If you think about a moment, this is exactly what you want - to know if width is smaller than height (portrait), the opposite (landscape) or if they are the same (square).
Then it comes down to this simple code:
public int getScreenOrientation()
{
Display getOrient = getWindowManag...
Kill child process when parent process is killed
...nifest once again? Apparently there's a break in the clouds, as Windows 8 now allows a process to belong to multiple jobs. [3] So I haven't tested it yet, but I imagine that this madness will be over now if you simply include a manifest with the supportedOS information.
Tip 1: If you're developing...
browser sessionStorage. share between tabs?
...sionStorage', JSON.stringify(sessionStorage));
// the other tab should now have it, so we're done with it.
localStorage.removeItem('sessionStorage'); // <- could do short timeout as well.
} else if (event.key == 'sessionStorage' && !sessionStorage.length) {
// another tab se...
Are there any standard exit status codes in Linux?
...
Given the way the question now appears, this does not appear to be the most useful (and thus accepted) answer.
– David J.
Dec 9 '13 at 22:49
...
How to get the CPU Usage in C#?
...lue();
System.Threading.Thread.Sleep(1000);
// now matches task manager reading
dynamic secondValue = cpuCounter.NextValue();
return secondValue;
}
private void Timer1_Tick(Object sender, EventArgs e)
{
int cpuPercent = (int)getCPUC...
Hadoop “Unable to load native-hadoop library for your platform” warning
...y install, it is here:
/opt/hadoop/lib/native/libhadoop.so.1.0.0
And I know it is 64-bit:
[hadoop@VMWHADTEST01 native]$ ldd libhadoop.so.1.0.0
./libhadoop.so.1.0.0: /lib64/libc.so.6: version `GLIBC_2.14' not found (required by ./libhadoop.so.1.0.0)
linux-vdso.so.1 => (0x00007fff43510000)
lib...