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惨不忍睹：说一说你最穷的时候是什么样子 - 创意 - 清泛网 - 专注C/C++及内核技术
...话说，一分钱难倒英雄汉，有的时候没钱真的很难。那么问题来了，...
每个人的一生中都会和金钱打交道，每个人也都会遇到囊中羞涩的时候。俗话说，一分钱难倒英雄汉，有的时候没钱真的很难。那么问题来了，你最穷...
What's the best free C++ profiler for Windows? [closed]
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Here is the link for CodeAnalyst: developer.amd.com/CPU/CODEANALYST/Pages/default.aspx
– epotter
Feb 19 '09 at 17:19
1
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Microsecond timing in JavaScript
... above, until the numbers become ultra-stable (loading time, JIT compiler, etc). 4. NOTE: The stability of the number gives you your attainable precision on an idle system. You can calculate the variance, if you need to self-check the precision. The variances are bigger on some browsers, and smal...
Wi-Fi 是什么的缩写 - 创意 - 清泛网 - 专注C/C++及内核技术
...试产品是否符合标准，导致 802.11 产品间的互通频频出现问题，而联盟的成立就是为了填补这一空缺。联盟还将推广符合 802.11 标准的无线网络技术作为己任，因此他们认为需要一个朗朗上口的名字来代替拗口的专业术语（呃…...
How can I profile C++ code running on Linux?
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With clang/clang++, one might consider using gperftools's CPU profiler. Caveat: Have not done so myself.
– einpoklum
Oct 14 '19 at 14:27
add a comment
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What belongs in an educational tool to demonstrate the unwarranted assumptions people make in C/C++?
...orge.net) which allowed you to compile C into Lua, Javascript, Perl, LISP, etc. It ruthlessly exploited the undefined behaviour in the C standard to make pointers work. It may be interesting to try this test on it.
– David Given
Aug 11 '10 at 12:29
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Checking to see if one array's elements are in another array in PHP
... checked the performance of each. The interesting thing is that the total CPU time, i.e. user time + system time is the same for PHP5.6 and the memory also is the same. The total CPU time under PHP5.4 is less for in_array than array_intersect, albeit marginally so.
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Most efficient T-SQL way to pad a varchar on the left to a certain length?
...hZeros from Tally
SET STATISTICS TIME OFF
SQL Server Execution Times:
CPU time = 2157 ms, elapsed time = 2696 ms.
SET STATISTICS TIME ON
select right('0000000000'+ rtrim(cast(N as varchar(5))), 10) from Tally
SET STATISTICS TIME OFF
SQL Server Execution Times:
CPU time = 31 ms, elapsed...
理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...d. One could write something like this to get around this:
这里有两个问题。一是可能忘记关闭文件句柄；二是文件读取数据发生异常，没有进行任何处理。下面是处理异常的加强版本：
file = open("/tmp/foo.txt")
try:
data = file.read()
finally:
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What is the meaning and difference between subject, user and principal?
...s. They may represent human users, automation, applications, connections, etc.
User - A subset of principal usually referring to a human operator. The distinction is blurring over time because the words "user" or "user ID" are commonly interchanged with "account". However, when you need to make t...