WCF performance issues - weird slowdown -

-

i have video-processing engine i've written while ago, combination of c# , c++, processes video file on disk @ 10 frames per second... c# part of spawns threads, , c++ bits of instantiate reader , video processing routines… there 1 main thread created when main c# object created, , main thread spawns off c++-based reader thread , video processing threads. threading verifiably correct. there no blocking or deadlock issues in it. code is/was stable.

now, if wrap whole thing inside wcf service, , use wcf set file process, tell (the video engine) “go”, individual frames process @ same speed, except once in while, every few seconds, threads stall out while, they're being suspended. it's weird!! doesn't happen when don't run through wcf.

this has nothing wcf calls themselves, because make few initialization calls wcf service running, don’t call wcf longer!!! service “persession”, concurrencymode = multiple, what’s going on not multithreading (locking/blocking) issue. main wcf interface has “connect” method, , in it, create main c# “background” thread, , thread, create more c++ based threads.

i put timer around 1 of video processing routines calls opencv (seriously) takes 1/10th of second, , logged it. i’ll similar this:

time: 100ms

time: 100ms

time: 100ms

time: 100ms

time: 100ms

time: 100ms

time: 100ms

time: 100ms

time: 2000ms <--- naughty! doesn't happen when running w/o wcf

time: 100ms

time: 100ms

time: 100ms

time: 100ms

time: 100ms

time: 100ms

there nothing in particular makes frame take longer, should 100ms others. since timer around block of code deep-down opencv routine didn’t write, seems me “somehow”, thread or iis process being suspended, horked, lowered in priority, or stalled out, because else going on.

i’m wcf newbie, no dummy programming , multithreading. don't know in wcf, i'm pretty savvy enough use tools slowdowns, if knew for.

again: not frequency of wcf calls!!! call 3 methods let rip (by itself)!!! runs many minutes w/o incoming wcf call!


Comments

Post a Comment

Popular posts from this blog

mysql - Dreamhost PyCharm Django Python 3 Launching a Site -

-
i'm new python/django , created simple django website using pycharm. site works fine running on computer, i'm lost when comes taking site onto host (dreamhost). i'm able upload files correct directories fine, , believe made correct changes database on mysql. i'm not sure go there though. right now, page shows files rather site. direction appreciated. much! you should not run django application using python manage.py runserver on production. how run application on django depends on server (apache, nginx) want use for apache - https://docs.djangoproject.com/en/1.10/howto/deployment/wsgi/modwsgi/ for nginx - https://www.digitalocean.com/community/tutorials/how-to-serve-django-applications-with-uwsgi-and-nginx-on-ubuntu-14-04 the mysql database should, of course, exist , have correct credentials. or, if choose use sqlite, file should accessible, readable , writable www-user (may different depending on linux distributive)
Read more

java - Sending SMS with SMSLib and Web Services -

-
i have made rest web service send smss using hsdpa usb modem. using smslib in java send smss. every time web service invoked, create gateway start service, send message, stop service , remove gateway. takes 20 seconds each message. found starting service takes lot of time. part of code use send smss service.getinstance().addgateway(gateway); service.getinstance().startservice(); outboundmessage msg = new outboundmessage(phonenumber, message); if (service.getinstance().sendmessage(msg)) { result = "message sent successfully!!"; } else { result = "could not send message."; } service.getinstance().stopservice(); service.getinstance().removegateway(gateway);//remove gateway is there way can start service once if not started , use send message when ever web service invoked? why dont group messages , send in 1 go? service.getinstance().sendmessages(messa...
Read more

java - How to resolve The method toString() in the type Object is not applicable for the arguments (InputStream) -

-
i'm trying read json file local machine. @path("/") public class jsonparsing { file f = new file("file.json"); if (f.exists()){ inputstream = new fileinputstream("file.json"); string jsontxt = ioutils.tostring(is); system.out.println(jsontxt); jsonobject json = new jsonobject(jsontxt); string = json.getstring("1000"); system.out.println(a); } } but i'm getting error in tostring() method. possible read .txt file containing json object local machine? if possible, how done? firstly: whenever ask question- add imports well. secondly: yes possible read .txt file containing json object. steps: 1. add maven dependency in pom.xml - <dependency> <groupid>com.googlecode.json-simple</groupid> <artifactid>json-simple</artifactid> <version>1.1.1</version> </dependency> or add jar of dependency. 2.import...
Read more