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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
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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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Troubleshooting BadImageFormatException
...renced a 64-bit assembly and the active build configuration was set to Any CPU but because of this "prefer 32-bit" setting assumably 32-bit was used running the application and caused the troubles.
– Bernoulli IT
Jun 30 '16 at 11:49
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What is the string length of a GUID?
...do here is to store it as uniqueidentifier - this is then fully indexable, etc. at the database. The next-best option would be a binary(16) column: standard GUIDs are exactly 16 bytes in length.
If you must store it as a string, the length really comes down to how you choose to encode it. As hex (A...
Attempted to read or write protected memory. This is often an indication that other memory is corrup
...out, the problem was that I changed the Platform for Build from x86 to Any CPU and that was enough to trigger this error. Changing it back to x86 did the trick. Might help someone.
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How to get the start time of a long-running Linux process?
...D
1 Mon Dec 23 00:31:43 2013 /sbin/init
# ps -p 1 -p $$ -wo user,pid,%cpu,%mem,vsz,rss,tty,stat,lstart,cmd
USER PID %CPU %MEM VSZ RSS TT STAT STARTED CMD
root 1 0.0 0.1 2800 1152 ? Ss Mon Dec 23 00:31:44 2013 /sbin/init
root 5151 0.3...
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...