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Linux bcc tools使用总结（持续更新） - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...后，手动Ctrl + C 结束统计，输出此段时间内各自耗时区间的IO事件个数。
默认微秒区间，-m 参数则是毫秒区间。
# /usr/share/bcc/tools/biolatency
Tracing block device I/O... Hit Ctrl-C to end.
^C
usecs : count distribution
...
Linux bcc tools使用总结（持续更新） - 操作系统(内核) - 清泛网移动版 - ...
...后，手动Ctrl + C 结束统计，输出此段时间内各自耗时区间的IO事件个数。
默认微秒区间，-m 参数则是毫秒区间。
# /usr/share/bcc/tools/biolatency
Tracing block device I/O... Hit Ctrl-C to end.
^C
usecs : count distribution
...
Linux bcc tools使用总结（持续更新） - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...后，手动Ctrl + C 结束统计，输出此段时间内各自耗时区间的IO事件个数。
默认微秒区间，-m 参数则是毫秒区间。
# /usr/share/bcc/tools/biolatency
Tracing block device I/O... Hit Ctrl-C to end.
^C
usecs : count distribution
...
Equals(=) vs. LIKE
...tify an example where these operators produce obviously different results. Allow me to quote from the MySQL manual:
Per the SQL standard, LIKE performs matching on a per-character basis, thus it can produce results different from the = comparison operator:
mysql> SELECT 'ä' LIKE 'ae' COLLA...
How to find memory leak in a C++ code/project?
...e software tools
1
Understand the operator basics. The C++ operator new allocates heap memory. The delete operator frees heap memory. For every new, you should use a delete so that you free the same memory you allocated:
char* str = new char [30]; // Allocate 30 bytes to house a string.
delete ...
What's the proper way to install pip, virtualenv, and distribute for Python?
...estion 4314376 , I recommended using ez_setup so that you could then install pip and virtualenv as follows:
15 Answer...
What is the copy-and-swap idiom?
...s arguably the most nuanced and difficult. How should it be done? What pitfalls need to be avoided?
The copy-and-swap idiom is the solution, and elegantly assists the assignment operator in achieving two things: avoiding code duplication, and providing a strong exception guarantee.
How does it wor...
Django in / not in query
...e(); Tbl2.objects.filter(id__in=IDs') This did not work because IDs is actually a QuerySet object. When I deleted the rows it originated from, it no longer worked with other queries. The solution is Tbl2.objects.filter(id__in=list(IDs)) -- turn it into a list
– Dakusan
...
Objective-C categories in static library
...roject as direct dependency (target -> general -> direct dependencies) and all works OK, but categories. A category defined in static library is not working in app.
...
What exactly is nullptr?
...constant can be converted to std::nullptr_t. The opposite direction is not allowed. This allows overloading a function for both pointers and integers, and passing nullptr to select the pointer version. Passing NULL or 0 would confusingly select the int version.
A cast of nullptr_t to an integral ty...