synchronization

问题 I am trying to look for scenarios where Sync Objects can be used in OpenGL. My understanding is that a sync object once put in GL command stream ( using glFenceSync() ) will be signaled after all the GL commands are executed and realized. If the sync objects are synchronization primitives why can't we MANUALLY signal them ? Where exactly this functionality can help GL programmer ? Is the following scenario a correct one ? Thread 1 : Load model Draw() glFenceSync() Thread 2 : glWaitSync();

问题 I have a small test application that executes two threads simultaneously. One increments a static long _value , the other one decrements it. I've ensured with ProcessThread.ProcessorAffinity that the threads are associated with different physical (no HT) cores to force intra processor communication and I have ensured that they overlap in execution time for a significant amount of time. Of course, the following does not lead to zero: for (long i = 0; i < 10000000; i++) { _value += offset; } So

问题 I am using thread wrapper which checks if function which updates VCL (which also has some arguments) was called from main thread or not and then executes in within the context of Main thread always. It works but I want to make it simpler. The problem is that I have to repeat this code in every function which needs VCL synchronization which is prone to errors. Is there a way to make this wrapper simpler and more re-useable? Note that this particular wrapper only uses one parameter but there

问题 When calling MPI_BCAST, is there any implied synchronization? For example, if the sender process were to get to the MPI_BCAST before others could it do the BCAST and then continue without any acknowledgements? Some recent tests with code like: program test include 'mpif.h' integer ierr, tid, tmp call MPI_INIT(ierr) call MPI_COMM_RANK(MPI_COMM_WORLD, tid, ierr) tmp = tid if(tid.eq.0) then call MPI_BCAST(tmp,1,MPI_INTEGER,MPI_ROOT,MPI_COMM_WORLD, ierr) else endif write(*,*) tid,'done' call MPI

问题 I'm attempting to improve performance on a suite that tests against ElasticSearch. The tests take a long time because Elasticsearch does not update it's indexes immediately after updating. For instance, the following code runs without raising an assertion error. from elasticsearch import Elasticsearch elasticsearch = Elasticsearch('es.test') # Asumming that this is a clean and empty elasticsearch instance elasticsearch.update( index='blog', doc_type=,'blog' id=1, body={ .... } ) results =

问题 I would like to know if everyone knows how precise PTP synchronization can be guaranteed on Windows Server 2008. I know about this thread: What is the minimum guaranteed time for a process in windows? which discusses windows' native time and yes, this does not give any guarantees at all. But what when it comes to hardware solutions (PTP)? Are there any limitations preventing a guarantee of < 1ms? I know the processes depending on the time will be competing for CPU time but if the process DOES

问题 This question has already been asked, but has received no answers. My iOS app and my WatchKit extension share an App Group in which a Core Data store persists. The Core Data model (simplified) is a Person object that has an attribute for Age. Both the app and extension can change the age at will. If the value for a person changes on the watch, the app does not reflect it unless I close and rerun the app. Same going the opposite direction. If I try to change the age on the watch to 20, and

问题 I have separate development and production MongoDB servers and I want to keep actual data in development server for sometime. What I should use for it: mongodump, mongoimport or something else? Clarification: I want to copy data from production to development. 回答1: You can use the db.copyDatabase(...) or db.cloneDatabase(...) commands: http://www.mongodb.org/display/DOCS/Copy+Database+Commands This is faster than mongodump / mongorestore because it skips creating the bson representation on

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . We are implementing a warehouse management system atop an open source stack (Java, web services & friends). In this system, we want to integrate many mobile devices which should also be capable of adequate online/offline functionality, e.g. preparing database inserts while a mobile device is temporarily

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . We are implementing a warehouse management system atop an open source stack (Java, web services & friends). In this system, we want to integrate many mobile devices which should also be capable of adequate online/offline functionality, e.g. preparing database inserts while a mobile device is temporarily