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Recommendation for compressing JPG files with ImageMagick
...accurate floating point discrete cosine transform, rather than the default fast integer version.
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Search text in fields in every table of a MySQL database
...ables to search
I have used this on up to 250 table/10GB databases (on a fast server) and the response time is nothing short of amazing.
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How efficient is locking an unlocked mutex? What is the cost of a mutex?
... a syscall to wake up one of the waiting processes. (On some systems cheap/fast syscalls are used to implement the mutexes, they become slow (normal) system calls only in case of contention.)
Locking unlocked mutex is really cheap. Unlocking mutex w/o contention is cheap too.
How much does a mu...
Git for beginners: The definitive practical guide
...nd drop).
It is far better integrated into OS X than git-gui/gitk, and is fast and stable even with exceptionally large repositories.
The original git repository pieter has not updated recently (over a year at time of writing). A more actively maintained branch is available at brotherbard/gitx - i...
ASP.NET MVC Performance
I found some wild remarks that ASP.NET MVC is 30x faster than ASP.NET WebForms. What real performance difference is there, has this been measured and what are the performance benefits.
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No grammar constraints (DTD or XML schema) detected for the document
I have this dtd : http://fast-code.sourceforge.net/template.dtd
But when I include in an xml I get the warning :
No grammar constraints (DTD or XML schema) detected for the document.
The xml is :
...
Best design for a changelog / auditing database table? [closed]
...know who made a change and when, but when a bad change happens, you want a fast way to put the data back.
While you are designing, you should write the code to recover data. When you need to recover, it is usually in a hurry, best to already be prepared.
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How can I get file extensions with JavaScript?
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The following solution is fast and short enough to use in bulk operations and save extra bytes:
return fname.slice((fname.lastIndexOf(".") - 1 >>> 0) + 2);
Here is another one-line non-regexp universal solution:
return fname.slice((Math...
How can I check if a Perl array contains a particular value?
...value in the array matches. This is true, however grep is still extremely fast for most cases. If you're talking about short arrays (less than 1000 items) then most algorithms are going to be pretty fast anyway. If you're talking about very long arrays (1,000,000 items) grep is acceptably quick r...
Why am I not getting a java.util.ConcurrentModificationException in this example?
...tors returned by this class's iterator and listIterator
methods are fail-fast: if the list is structurally modified at any
time after the iterator is created, in any way except through the
iterator's own remove or add methods, the iterator will throw a
ConcurrentModificationException.
This...