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Purpose of ESI & EDI registers?
...erations that work on a bunch of bytes at a time, and they kind of put the CPU in automatic. Because you're not explicitly coding loops, they do their thing more efficiently (usually) than a hand-coded loop.
Just in case you're wondering: Depending on how you set the operation up, repeated storing ...
How to see which flags -march=native will activate?
...ggest that this is suboptimal. The output of --help=target doesn't display CPU cache information, of which the methods both elias and 42n4 below have listed. Specifically, on gcc 4.9.2 on a Phenom, the output includes these: --param l1-cache-size=64 --param l1-cache-line-size=64 --param l2-cache-siz...
Why is ArrayDeque better than LinkedList
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Also, since the linked list nodes are allocated here and there, usage of CPU cache won't provide much benefit.
If it might be of interest, I have a proof that adding (appending) an element to ArrayList or ArrayDeque runs in amortized constant time; refer to this.
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How to measure time taken by a function to execute
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In Chrome, press F12 and select the Profiles tab, then Collect JavaScript CPU Profile.
In Firefox, install/open Firebug, and click on the Profile button.
In IE 9+, press F12, click on Script or Profiler (depending on your version of IE).
Alternatively, on your development machine, you can add i...
IN vs OR in the SQL WHERE Clause
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| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 8 | 1416 | 163 (2)| 00:00:02 |
|* 1 | TABLE ACCESS ...
Is there a generator version of `string.split()` in Python?
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This is because memory is slower than cpu and in this case, the list is loaded by chunks where as all the others are loaded element by element. On the same note, many academics will tell you linked lists are faster and have less complexity while your computer wil...
parseInt vs unary plus, when to use which?
...arseInt beats unary plus on iOS :) This is helpful for web apps with heavy CPU consumption only. As a rule-of-thumb I'd suggest JS opt-guys to consider any JS operator over another one from the mobile performance point of view nowadays.
So, go mobile-first ;)
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How to overload the operator++ in two different ways for postfix a++ and prefix ++a?
...erformance difference. If the object you are returning doesn't fit into a CPU register, then you are doing an expensive copy operation. This is fine if you need to use the pre-incremented value, but if you don't, postfix is much better. An example would be an iterator where you typically use: for...
What is the JavaScript convention for no operation?
...rs seem to do nothing to execute the noop defined this way (and hence save CPU cycles), there might be some performance issues associated with this (as is also mentioned by others in comments or in other answers).
However, that being said, you can easily define your own noop function and, infact, m...
Should I instantiate instance variables on declaration or in the constructor?
...ow it was him). Personal taste is personal taste; ultimately, neither the CPU nor the JRE care about syntactical style.
– Aquarelle
Sep 20 '13 at 22:38
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