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Number of processors/cores in command line
...
nproc is what you are looking for.
More here : http://www.cyberciti.biz/faq/linux-get-number-of-cpus-core-command/
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BLE（二）信道&数据包&协议栈格式 - 创客硬件开发 - 清泛IT社区，...
文章源自：https://www.gandalf.site/2018/11/ble_23.html
参考低功耗蓝牙（BLE）安全初探
0x1 信道BLE的物理通道即“频道，分别是‘f=2402+k*2 MHz, k=0, … ,39’，带宽为2MHz”的40个RF Channel。
其中，有3个信道是advertising channel（广播通道）...
Rails 3 - can't install pg gem
... have it, download typing this in your terminal:
ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"
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When to use PNG or JPG in iPhone development?
...ould consider crushing the PNGs on the server before the download.
http://www.cocoanetics.com/2011/10/avoiding-image-decompression-sickness/
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Location Services not working in iOS 8
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According to the Apple docs:
https://developer.apple.com/documentation/corelocation/requesting_permission_to_use_location_services
https://developer.apple.com/documentation/corelocation/cllocationmanager/1620562-requestwheninuseauthorization
As of iOS ...
Long vs Integer, long vs int, what to use and when?
...ent (even unclear) memory-sizes of the primitive types:
Java - all clear: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html
byte, char .. 1B .. 8b
short int .. 2B .. 16b
int .. .. .. .. 4B .. 32b
long int .. 8B .. 64b
C .. just mess: https://en.wikipedia.org/wiki/C_data_...
In-memory size of a Python structure
... "How big is this complex object in memory?"
There's a great answer here: https://goshippo.com/blog/measure-real-size-any-python-object/
The punchline:
import sys
def get_size(obj, seen=None):
"""Recursively finds size of objects"""
size = sys.getsizeof(obj)
if seen is None:
...
Verify if a point is Land or Water in Google Maps
...by adding pixels.
function isItWatter($lat,$lng) {
$GMAPStaticUrl = "https://maps.googleapis.com/maps/api/staticmap?center=".$lat.",".$lng."&size=40x40&maptype=roadmap&sensor=false&zoom=12&key=YOURAPIKEY";
//echo $GMAPStaticUrl;
$chuid = curl_init();
curl_seto...
How do you unit test a Celery task?
...import current_app
def send_task(name, args=(), kwargs={}, **opts):
# https://github.com/celery/celery/issues/581
task = current_app.tasks[name]
return task.apply(args, kwargs, **opts)
current_app.send_task = send_task
...
What does the [Flags] Enum Attribute mean in C#?
...
Combining answers https://stackoverflow.com/a/8462/1037948 (declaration via bit-shifting) and https://stackoverflow.com/a/9117/1037948 (using combinations in declaration) you can bit-shift previous values rather than using numbers. Not necess...