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How to implement the activity stream in a social network
...he records as compact as you can. Structure so that you can quickly grab a batch of activities by activity ID or by using a set of friend IDs with time constraints.
Publish the activity IDs to Redis whenever an activity record is created, adding the ID to an "activity stream" list for every user who...
What is a good pattern for using a Global Mutex in C#?
...aitOne(Timeout.Infinite, false);
hasHandle = mutex.WaitOne(5000, false);
if (hasHandle == false)
throw new TimeoutException("Timeout waiting for exclusive access");
}
catch (AbandonedMutexException)
{
...
Batch Renaming of Files in a Directory
Is there an easy way to rename a group of files already contained in a directory, using Python?
13 Answers
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How can I use PowerShell with the Visual Studio Command Prompt?
...onment variables, but those variables appear to be initialized by the very batch file we're trying to extract variables from. I would be happy to see evidence to the contrary. I have a clean Windows 10 install with a clean Visual Studio 2017 install and no VS150COMNTOOLS environment variable until I...
How to add a WiX custom action that happens only on uninstall (via MSI)?
...trouble of using something like C++ program to do the action, instead of a batch script because of the power and control it provides -- and you can prevent the "cmd prompt" window from flashing while your installer runs.
sha...
When NOT to use Cassandra?
...
That stuff is all COBOL and batch processing, and not nearly as well designed/stable as you might think. ATMs do not connect to any sort of unified data store, so are hardly a suitable example. It's like saying SQL isn't suitable for web apps because yo...
How to do a batch insert in MySQL
... Please note that while the question is labelled "How to do batch inserts" this answer is actually bulk insert. Bulk is usually faster, see this question
– Mike Demenok
Dec 17 '13 at 3:51
...
How do you add an in-app purchase to an iOS application?
...apsRemoveAds{
NSLog(@"User requests to remove ads");
if([SKPaymentQueue canMakePayments]){
NSLog(@"User can make payments");
//If you have more than one in-app purchase, and would like
//to have the user purchase a different product, simply define
//ano...
IF… OR IF… in a windows batch file
Is there a way to write an IF OR IF conditional statement in a windows batch-file?
14 Answers
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海量数据相似度计算之simhash短文本查找 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...算量还是蛮大，普通PC 比较1000w次海明距离需要 300ms ，和5000w数据比较需要1.8 s。看起来相似度计算不是很慢，还在秒级别。给大家算一笔账就知道了：
随着业务增长需要一个小时处理100w次，一个小时为3600 *1000 = 360w毫秒，计算...