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Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
...t just eats up bytes for no reason and potentially increases cache misses, etc.
The noise it makes pretty much makes timing micro-optimizations
impossible.
How can I make sure that such accidental lucky / unlucky alignments
are not interfering when I do micro-optimizations (unrelated to...
How to execute a raw update sql with dynamic binding in rails
...ure if there are other ramifications to doing this (connections left open, etc). I would trace the Rails code for a normal update to see what it's doing aside from the actual query.
Using prepared queries can save you a small amount of time in the database, but unless you're doing this a million ti...
Linux C++ 单元测试与gcov代码覆盖率统计 - C/C++ - 清泛网 - 专注C/C++及内核技术
...cpp.gcov
lcov --rc lcov_branch_coverage=1 -c -d . -o demo_lcov_report
#all
#genhtml --rc genhtml_branch_coverage=1 demo_lcov_report -o out_report
#filter
lcov --rc lcov_branch_coverage=1 -r demo_lcov_report '/usr/include/*' '*lib/*' -o filtered_coverage
genhtml --rc genhtml_branch_coverage=1...
Regex to Match Symbols: !$%^&*()_+|~-=`{}[]:";'?,./
...er class exclusion route: match everything BUT alpha, digits, white space, etc.
– Pete Alvin
Apr 29 '15 at 13:00
1
...
Where to place AutoMapper.CreateMaps?
...
{
Mapper.CreateMap<User,UserViewModel>();
}
// ... etc
}
We create a method for each "aggregate" (User, Post), so things are separated nicely.
Then your Global.asax:
AutoMapperWebConfiguration.Configure();
AutoMapperServicesConfiguration.Configure();
AutoMapperDomainConfi...
How does python numpy.where() work?
... operation on a numpy array returns a boolean array. (i.e. __gt__, __lt__, etc all return boolean arrays where the given condition is true).
E.g.
x = np.arange(9).reshape(3,3)
print x > 5
yields:
array([[False, False, False],
[False, False, False],
[ True, True, True]], dtyp...
How do I get PyLint to recognize numpy members?
...-members=numpy.*
As another solution, add this option to ~/.pylintrc or /etc/pylintrc file:
[TYPECHECK]
# List of members which are set dynamically and missed by pylint inference
# system, and so shouldn't trigger E1101 when accessed. Python regular
# expressions are accepted.
generated-members=...
How to debug a Flask app
... well).
For Linux, Mac, Linux Subsystem for Windows, Git Bash on Windows, etc.:
export FLASK_APP=myapp
export FLASK_ENV=development
flask run
For Windows CMD, use set instead of export:
set FLASK_ENV=development
For PowerShell, use $env:
$env:FLASK_ENV = "development"
Prior to Flask 1.0, t...
Is arr.__len__() the preferred way to get the length of an array in Python?
...ents could still be length-checked. This includes strings, queues, trees, etc.
The functional nature of len() also lends itself well to functional styles of programming.
lengths = map(len, list_of_containers)
share
...
What is the meaning of the /dist directory in open source projects?
...lly located here.
assets/: static content like images, video, audio, fonts etc.
lib/: external dependencies (when included directly).
test/: the project's tests scripts, mocks, etc.
node_modules/: includes libraries and dependencies for JS packages, used by Npm.
vendor/: includes libraries and depen...