threadpool

Maximum pool size when using ThreadPool Python

由 ⅰ亾dé卋堺 提交于 2019-12-08 00:08:04
问题 I am using ThreadPool to achieve multiprocessing. When using multiprocessing, pool size limit should be equivalent to number of CPU cores. My question- When using ThreadPool, should the pool size limit be number of CPU cores? This is my code from multiprocessing.pool import ThreadPool as Pool class Subject(): def __init__(self, url): #rest of the code def func1(self): #returns something if __name__=="__main__": pool_size= 11 pool= Pool(pool_size) objects= [Subject() for url in all_my_urls]

How to make the main thread wait for the other threads to complete in ThreadPoolExecutor

由 你离开我真会死。 提交于 2019-12-07 21:08:03
问题 I am using the ThreadPoolExecutor to implement threading in my Java Application. I have a XML which I need to parse and add each node of it to a thread to execute the completion. My implementation is like this: parse_tp is a threadpool object created & ParseQuotesXML is the class with the run method. try { List children = root.getChildren(); Iterator iter = children.iterator(); //Parsing the XML while(iter.hasNext()) { Element child = (Element) iter.next(); ParseQuotesXML quote = new

MVVM: Update view's control visibility after completion of threadpool worker item in WPF NET 3.5

由 雨燕双飞 提交于 2019-12-07 20:34:28
I have a WPF MVVM app under NET 3.5 and Visual Studio 2008. Some controls in the view are bound to properties on the view model, so when these properties changes it will be notified to the view through the implementation of INotifyPropertyChanged. I have some kind of splash saying "Loading..." that appears in the center of the window at the beginning, and it keeps visible while some data is being requested from database. Once data is requested from database, I want to hide this splash. This splash is bound to a propert, "IsSplashVisible" in view model so updating the property to true, notify

What happens with ASP.Net thread after Response.End ThreadAbortException?

由 落爺英雄遲暮 提交于 2019-12-07 15:52:15
问题 There are a few answers explaining Is Response.End() considered harmful? However I haven't find a clear confirmation, what would happen with ASP.Net thread after Response.End ThreadAbortException. Eric Lippert in his comment to Response.End () doesn't abort current thread noted that "thread is just going to go back in the thread pool.", but he admitted, that he had not worked on the threading model for more than 10 years. In CodeProject article Exploration of approaches to handle

How can I solve MongoWaitQueueFullException?

由 谁都会走 提交于 2019-12-07 15:48:52
问题 I run a java program which is a thread executor program that inserts thousands of documents to a table in mongodb. I get the following error Exception in thread "pool-1-thread-301" com.mongodb.MongoWaitQueueFullException: Too many threads are already waiting for a connection. Max number of threads (maxWaitQueueSize) of 500 has been exceeded. at com.mongodb.PooledConnectionProvider.get(PooledConnectionProvider.java:70) at com.mongodb.DefaultServer.getConnection(DefaultServer.java:73) at com

Limiting the number of threadpool threads

由 混江龙づ霸主 提交于 2019-12-07 14:49:54
问题 I am using ThreadPool in my application. I have first set the limit of the thread pool by using the following: ThreadPool.SetMaxThreads(m_iThreadPoolLimit,m_iThreadPoolLimit); m_Events = new ManualResetEvent(false); and then I have queued up the jobs using the following WaitCallback objWcb = new WaitCallback(abc); ThreadPool.QueueUserWorkItem(objWcb, m_objThreadData); Here abc is the name of the function that I am calling. After this I am doing the following so that all my threads come to 1

newFixedThreadPool() vs newCachedThreadPool() [duplicate]

由 倖福魔咒の 提交于 2019-12-07 14:37:26
问题 This question already has answers here : Executors.newCachedThreadPool() versus Executors.newFixedThreadPool() (8 answers) Closed 4 years ago . In case newCachedThreadPool() as per creates a thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available whereas in case of newFixedThreadPool(int size) specify size to create the thread pool with size specified. Why isn't newFixedThreadPool(int size) implemented in newCachedThreadPool()

Why does memory consumption increase dramatically in `Pool.map()` multiprocessing?

由 雨燕双飞 提交于 2019-12-07 11:41:53
问题 I am doing a multiprocessing on a pandas dataframe by splitting it into several dataframes, which are stored as list. And, using Pool.map() I am passing the dataframe to a defined function. My input file is about "300 mb", so small dataframes are roughly "75 mb". But, when the multiprocessing is running the memory consumption increases by 7 GB and each local process consumes about approx. 2 GB of memory. Why is this happening? def main(): my_df = pd.read_table("my_file.txt", sep="\t") my_df =

Is using thread local storage safe for this operation?

由 六眼飞鱼酱① 提交于 2019-12-07 10:10:44
问题 I have a ASP.NET web application that allows end users to upload a file. Once the file is on the server, I spawn a thread to process the file. The thread is passed data regarding the specific operation ( UserId , file path, various options, etc.). Most of the data is passed around via objects and method parameters but UserId needs to be available more globally so I put it in thread-local storage. The thread is lengthy but it just processes the file and aborts. Is my use of the named data slot

Limit number of processors used in ThreadPool

由 依然范特西╮ 提交于 2019-12-07 07:29:10
问题 Is there any way to limit the number of processors that the ThreadPool object will use? According to the docs, "You cannot set the number of worker threads or the number of I/O completion threads to a number smaller than the number of processors in the computer." So how can I limit my program to not consume all the processors? 回答1: After some experiments, I think I have just the thing. I've noticed that the ThreadPool considers the number of processors in the system as the number of
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