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构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...放资源给其他进程执行，这样系统的吞吐量不高。
需要把业务进行逻辑的分段，采用异步非阻塞的方式，提高系统的吞吐量。
随着数据量和并发量的增加，读写分离不能满足系统并发性能的要求，需要对数据进行切分，包括...
Should IBOutlets be strong or weak under ARC?
...ng pointer bug I've experienced:
A UIViewController has a UITextField for zip code. It uses CLLocationManager to reverse geocode the user's location and set the zip code. Here's the delegate callback:
-(void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocat...
Creating dataframe from a dictionary where entries have different lengths
...k]) for k, v in data.items()], axis=1)
Use pandas.DataFrame and itertools.zip_longest
For iterables of uneven length, zip_longest fills missing values with the fillvalue.
The zip generator needs to be unpacked, because the DataFrame constructor won't unpack it.
from itertools import zip_longest
...
Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
...
I'd just use zip:
In [1]: from pandas import *
In [2]: def calculate(x):
...: return x*2, x*3
...:
In [3]: df = DataFrame({'a': [1,2,3], 'b': [2,3,4]})
In [4]: df
Out[4]:
a b
0 1 2
1 2 3
2 3 4
In [5]: df["A1"], ...
Is there an easy way to attach source in Eclipse?
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Up until yesterday I was stuck painstakingly downloading source zips for tons of jars and attaching them manually for every project. Then a colleague turned me on to The Java Source Attacher. It does what eclipse should do - a right click context menu that says "Attach Java Source".
I...
Is there a quick way to delete a file from a Jar / war without having to extract the jar and recreat
...
zip -d file.jar unwanted_file.txt
jar is just a zip file after all. Definitely much faster than uncompressing/recompressing.
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How to perform better document version control on Excel files and SQL schema files
...sions.
The same is true for .xlsx if you decompress them. .xlsx files are zipped up directories of XML files (See How to properly assemble a valid xlsx file from its internal sub-components?). Git will view them as binary unless decompressed. It is possible to unzip the .xlsx and track the changes ...
Sorting an array of objects by property values
...by any field at will...
const homes=[{h_id:"3",city:"Dallas",state:"TX",zip:"75201",price:"162500"},{h_id:"4",city:"Bevery Hills",state:"CA",zip:"90210",price:"319250"},{h_id:"5",city:"New York",state:"NY",zip:"00010",price:"962500"}];
// Sort by price high to low
console.log(homes.sort(sort_...
Create nice column output in python
...... ]
...
>>> widths = [max(map(len, col)) for col in zip(*rows)]
>>> for row in rows:
... print " ".join((val.ljust(width) for val, width in zip(row, widths)))
...
a b c d
aaaaaaaaaa b c d
a bbbbbbbbbb c d
...
ATL CComPtr和CComQIPtr详解 - C/C++ - 清泛网 - 专注IT技能提升
...。而CComQIPtr不但实现了CComPtr的所有的功能，而且当我们把一个不同类型的接口指针赋值给CComQIPtr的时候，CComQIPtr会自动的调用接口指针的QueryInterface接口，来获得对应的正确的接口指针。CComPtr和CComQIPtr是智能接口指针类，它们...