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Should I use multiplication or division?
...t=12341234234.234 * 0.5 end'
real 0m1.843s
user 0m1.676s
sys 0m0.000s
=>it's only 5% faster
conclusions: in Python it's faster to multiply than to divide, but as you get closer to the CPU using more advanced VMs or JITs, the advantage disappears. It's quite possible that a future Py...
Does MySQL included with MAMP not include a config file?
...ally adding the my.cnf file to Application/MAMP/conf/ solved ERROR 2006 (HY000) at line 1357: MySQL server has gone away. This post is old but still relevant for MAMP Version 3.0.2 (not pro)
– C13L0
Mar 16 '14 at 19:25
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How do I match any character across multiple lines in a regular expression?
...p prints the file after applying the script given by -e). Note that using -000pe will slurp the file and activate 'paragraph mode' where Perl uses consecutive newlines (\n\n) as the record separator.
gnu-grep - grep -Poz '(?si)abc\K.*?(?=<Foobar>)' file. Here, z enables file slurping, (?s) ena...
Virtual functions and performance - C++
...it in L1) and ran a loop that added them to one another (A.x = B.x + C.x) 1000 times. I ran this with the functions defined as inline, virtual, and regular function calls. Here are the results:
inline: 8ms (0.65ns per call)
direct: 68ms (5.53ns per call)
virtual: 160ms (13ns per call)
So, i...
SQL query to find record with ID not in another table
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When i have 20 datas, It works, but when i have 20000 datas, it not work, Iam confuse now.
– Frank
Nov 2 '16 at 3:25
1
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Why is \r a newline for Vim?
...a <Nul> with a search pattern you can just enter CTRL-@ or
"CTRL-V 000". This is probably just what you expect. Internally the
character is replaced with a <NL> in the search pattern. What is unusual is
that typing CTRL-V CTRL-J also inserts a <NL>, thus also searches for ...
从Code Review 谈如何做技术 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的描述——
卡珀斯·琼斯（Capers Jones）分析了超过12,000个软件开发项目，其中使用正式代码审查的项目，发现潜在缺陷率约在60-65%之间，若是非正式的代码审查，发现潜在缺陷率不到50%。大部份的测试，发现的潜在缺陷率会...
Is “double hashing” a password less secure than just hashing it once?
... list is less than three hours if only one iteration is used. But if just 2000 iterations are used, that time extends to almost 8 months. To defeat a more sophisticated attacker—one capable of downloading a program that can tap the power of their GPU, for example—you need more iterations.
How m...
Does anyone have benchmarks (code & results) comparing performance of Android apps written in Xamari
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GetAll: Retrieving all data from the database.
With databases having 10,000 records. All operations were processed internally on devices.
Xamarin Native (Xamarin.iOS/Xamarin.Android) show themselves as rather good alternatives to the native code, whereas Xamarin.Forms seems slow in a lot o...
CruiseControl [.Net] vs TeamCity for continuous integration?
...sed at larger companies. I've used Perforce and liked it but I was at a 1,000 developer company when I used it.
– Samuel Neff
May 18 '11 at 13:30
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