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mongoose vs mongodb (nodejs modules/extensions), which better? and why?
...n assumption and guesswork when making vital systems. So here I can either test my assertion with code or dig much deeper into Google or their code. As a one off this isn't so bad but I find my self in this situation many times when reading their documentation. The difference can mean days spent on ...
How do emulators work and how are they written? [closed]
... etc., but that is doable.
In fact, many microchip and CPU manufacturers test programs against an emulator of the chip and then against the chip itself, which helps them find out if there are issues in the specifications of the chip, or in the actual implementation of the chip in hardware. For exa...
What's the difference between a temp table and table variable in SQL Server?
..."
:setvar tablescript "DECLARE @T TABLE"
/*
--Uncomment this section to test a #temp table
:setvar tablename "#T"
:setvar tablescript "CREATE TABLE #T"
*/
USE tempdb
GO
CHECKPOINT
DECLARE @LSN NVARCHAR(25)
SELECT @LSN = MAX([Current LSN])
FROM fn_dblog(null, null)
EXEC(N'BEGIN TRAN St...
C++ Dynamic Shared Library on Linux
... can try ldd:
LD_LIBRARY_PATH=. ldd main
Prints on my machine:
~/prj/test/shared$ LD_LIBRARY_PATH=. ldd main
linux-gate.so.1 => (0xb7f88000)
libshared.so => ./libshared.so (0xb7f85000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xb7e74000)
libm.so.6 => /lib/libm.so...
Lock, mutex, semaphore… what's the difference?
...uld be implemented as a simple 'boolean flag').
Busy waiting= Continuosly testing of a variable until some value appears.
Finally:
Spin-lock (aka Spinlock)= A lock which uses busy waiting. (The acquiring of the lock is made by xchg or similar atomic operations).
[No thread sleeping, mostly used ...
Why does Unicorn need to be deployed together with Nginx?
...ts creators made the decision to leverage existing software that is battle-tested and very well designed and to avoid wasting time and energy on problems already solved by other software.
But let's get technical and answer your question:
Why does Unicorn needs to be deployed together with nginx...
Why is C so fast, and why aren't other languages as fast or faster? [closed]
...be a pointer to an array of ASCII integers, which we call chars. In C, we test for character existence one at a time. In Delphi, I use Pos.
And this is just a small example. In a large program, a C programmer has to make these kinds of low-level decisions with every few lines of code. It adds u...
docker mounting volumes on host
...> /myvol/greeting
VOLUME /myvol
build the image:
$ docker build -t testing_volume .
Run the container, say container1:
$ docker run -it <image-id of above image> bash
Now run another container with volumes-from option as (say-container2)
$ docker run -it --volumes-from <id-o...
How do you validate a URL with a regular expression in Python?
... return url is not None and regex.search(url)
You can always check the latest version here: https://github.com/django/django/blob/master/django/core/validators.py#L74
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Is SHA-1 secure for password storage?
...ack is an attack where the attacker has all the data he needs in order to "test" passwords; e.g. the attacker could get a copy of the database holding the hashed passwords. In an offline attack, the attacker is limited only by his computational resources. Conversely, an online attack is an attack wh...