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In Visual Studio C++, what are the memory allocation representations?
...e the instruction pointer lands (except perhaps the last filled byte), the CPU can resume executing a valid two-byte x86 instruction CD CD, in this case for generating software interrupt 205 (0xCD).
Weirder still, whereas CD CC CD CC is 100% interpretable--giving either INT 3 or INT 204--the sequen...
Why does Google prepend while(1); to their JSON responses?
...phic evaluation server-side. At Google scale, that would require a lot of CPU. This sort of offloads it to the client.
– bluesmoon
Feb 5 '13 at 6:10
98
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How do I replace NA values with zeros in an R dataframe?
...am running these tests on fully numeric dataframes.
Hardware Used
3.9 GHz CPU with 24 GB RAM
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Bash tool to get nth line from a file
...huge, you'd better exit after reading the required line. This way you save CPU time See time comparison at the end of the answer.
awk 'NR == num_line {print; exit}' file
If you want to give the line number from a bash variable you can use:
awk 'NR == n' n=$num file
awk -v n=$num 'NR == n' file ...
How can I repeat a character in Bash?
...llowing are timings taken on a late-2012 iMac with a 3.2 GHz Intel Core i5 CPU and a Fusion Drive, running OSX 10.10.4 and bash 3.2.57, and are the average of 1000 runs.
The entries are:
listed in ascending order of execution duration (fastest first)
prefixed with:
M ... a potentially multi-cha...
What is exactly the base pointer and stack pointer? To what do they point?
...egisters stay where they are, only their value is sent to the RAM from the CPU. In the amd64 mode, this gets a bit more complex, but leave that to another question.
– wigy
Jan 20 '17 at 10:42
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Explain the use of a bit vector for determining if all characters are unique
...cause operations with bits are very low level and can be executed as-is by CPU. BitVector allows writing a little bit less cryptic code instead plus it can store more flags.
For future reference: bit vector is also known as bitSet or bitArray. Here are some links to this data structure for differen...
Building and running app via Gradle and Android Studio is slower than via Eclipse
...ject with gradle files and indexing tasks). Measure build time and process CPU with and without antivirus enabled to see if it is related.
Profiling a build
Gradle has built-in support for profiling projects. Different projects are using a different combination of plugins and custom scripts. Usin...
What is the volatile keyword useful for?
...So if Thread A is creating Singleton instance and just after creation, the CPU corrupts etc, all other threads will not be able to see the value of _instance as not null and they will believe it is still assigned null.
Why does this happen? Because reader threads are not doing any locking and unt...
PostgreSQL: Difference between text and varchar (character varying)
... increased storage space when using the blank-padded type, and a few extra CPU cycles to check the length when storing into a length-constrained column. While character(n) has performance advantages in some other database systems, there is no such advantage in PostgreSQL; in fact character(n) is usu...