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How dangerous is it to compare floating point values?
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High Performance MarkHigh Performance Mark
72.8k77 gold badges9595 silver badges144144 bronze badges
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Fastest hash for non-cryptographic uses?
...0731 0dbab6d0c841278d33be207f14eeab8b
sha1: 0.07331 417a9e5c9ac7c52e32727cfd25da99eca9339a80
xor: 0.65218 119
xor2: 0.29301 134217728
add: 0.57841 1105
And the code used to generate this is:
$loops = 100000;
$str = "ana are mere";
echo "<pre>";
$tss = microtime(true);...
SHA1 vs md5 vs SHA256: which to use for a PHP login?
...caveats of bcrypt
Bcrypt will silently truncate any password longer than 72 characters.
Bcrypt will truncate after any NUL characters.
(Proof of Concept for both caveats here.)
You might be tempted to resolve the first caveat by pre-hashing your passwords before running them through bcrypt, but...
std::vector performance regression when enabling C++11
... # 2.795 GHz ( +- 1.89% ) [77.53%]
50,721,061 stalled-cycles-frontend # 51.22% frontend cycles idle ( +- 3.74% ) [79.47%]
25,585,331 stalled-cycles-backend # 25.84% backend cycles idle ( +- 4.90% ) [73.07%]
141,947,224 instructi...
Sort JavaScript object by key
...lMatt Ball
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Is calculating an MD5 hash less CPU intensive than SHA family functions?
...es 1024 bytes 8192 bytes
md5 35391.50k 104905.27k 229872.93k 330506.91k 382791.75k
sha1 38054.09k 110332.44k 238198.72k 340007.12k 387137.77k
Third update: OS X 10.14 with LibreSSL is a lot faster (still on the same machine). SHA-1 still comes out on to...
正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...明作者以及来源。
正则表达式30分钟入门教程
版本：v2.31 (2009-4-11) 作者：deerchao 转载请注明来源
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Are arrays in PHP copied as value or as reference to new variables, and when passed to functions?
...o array variables (the original and the copy)?
– fede72bari
Sep 13 '19 at 8:18
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What GRANT USAGE ON SCHEMA exactly do?
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For a production system, you can use this configuration :
--ACCESS DB
REVOKE CONNECT ON DATABA...
Speed comparison with Project Euler: C vs Python vs Erlang vs Haskell
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Thomas Baruchel
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answered Aug 7 '11 at 20:04
zeekayzeekay
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