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Creating a simple XML file using python
...performance, the benchmarks on the LXML site indicate that:
LXML clearly wins for serializing (generating) XML
As a side-effect of implementing proper parent traversal, LXML is a bit slower than cElementTree for parsing.
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Convert base64 string to ArrayBuffer
...d, first we decode the base64 string (atob), then we create new array of 8-bit unsigned integers with the same length as the decoded string. After that we iterate the string and populate the array with Unicode value of each character in the string.
– Goran.it
J...
How can you encode a string to Base64 in JavaScript?
...so…
btoa() accepts a “string” where each character represents an 8-bit byte – if you pass a string containing characters that can’t be represented in 8 bits, it will probably break. This isn’t a problem if you’re actually treating the string as a byte array, but if you’re trying to...
Why would introducing useless MOV instructions speed up a tight loop in x86_64 assembly?
...works well unless two important uncorrelated branches share the same lower bits. In that case, you end-up with aliasing which causes many mispredicted branches (which stalls the instruction pipeline and slowing your program).
If you want to understand how branch mispredictions affect performance, ...
Exotic architectures the standards committees care about
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@ybungalobill: On old Win16 compilers, regular pointers were near pointers and contained just a 16-bit offset, so sizeof(int*) == 2, but far pointers also had a 16-bit selector, so sizeof(void*) == 4.
– Adam Rosenfield
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Why do people say there is modulo bias when using a random number generator?
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I may be nitpicking, but if the goal is to reduce wasted bits we could improve this slightly for the edge condition where RAND_MAX (RM) is only 1 less than being equally divisible by N. In this scenario, no bits need to be wasted by doing X >= (RM - RM % N)) which is of little v...
Hash String via SHA-256 in Java
... this version has a bug (at least as of today and with java8@win7). try to hash '1234'. the result must start with '03ac67...' but it actually starts with '3ac67...'
– Chris
Sep 4 '14 at 9:31
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StringIO in Python3
...O should be applied instead. Tested myself on python 3.5 @ eclipse pyDev + win7 x64. Please let me know if I were wrong thanks.
– Bill Huang
Mar 5 '16 at 17:16
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How does a language expand itself? [closed]
... some of Qt 's capabilities to code GUI programs. I asked myself the following question:
15 Answers
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Hadoop “Unable to load native-hadoop library for your platform” warning
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I assume you're running Hadoop on 64bit CentOS. The reason you saw that warning is the native Hadoop library $HADOOP_HOME/lib/native/libhadoop.so.1.0.0 was actually compiled on 32 bit.
Anyway, it's just a warning, and won't impact Hadoop's functionalities.
H...