http://blog.gmane.org/gmane.comp.python.simpy.user hourly 1 1901-01-01T00:00+00:00 http://gmane.org/img/gmane-25t.png http://gmane.org http://comments.gmane.org/gmane.comp.python.simpy.user/1528 <pre>Hello SimPy community, here’s another SimPy 3 status update: We were finally happy with Ontje’s resource refactoring branch [1| and merged it into the default repository. The resource API does not change very much (the most important aspects stayed the same), but all resources now inherit from a single *BaseResource* and, as with the *Environment*, events now play a more important role in the implementation. We also added two new resource types, so we now have: - Resource: The good old resource. It implements the basis functionality from SimPy 2’s counterpart and has a much leaner implementation. - PriorityResource: Processes requesting the resource are sorted by priority, which they can pass to each *request()* - PreemptiveResource: Like PriorotiyResource, but processes can also preempt users of the resource if their priority is high enough. - Container: The one you know from SimPy 2. Stores an abstract, homogeneous amount of something (e.g., a bottle of milk or a basket of apples). Pr</pre> Stefan Scherfke 2013-05-19T18:21:53 http://comments.gmane.org/gmane.comp.python.simpy.user/1519 <pre>Here's an unexpected behavior in SimPy 3. Sorry if it sounds a bit too much like a bad horror movie. I have a large simulation (thousands of processes), and was measuring several things about it, including the event queue length (len(env._events)). After the simulation ran for a while, the event queue length was growing much larger than I could account for just based on how many processes exist. I then measured both the length of the event queue and the number of events on it that have callbacks. Interestingly, the number of events with callbacks never grows very high, but the number without callbacks - which I'll refer to as zombie events (since they won't do anything but die when step finally gets to them) - grows very high. Further investigation shows that all the zombies are timeout events (type simpy.core.Timeout). This simulation makes heavy use of interrupts. That's probably the source of the zombies. Unfortunately, it would be very hard to change the simulation design to use subs</pre> Jonathan Leivent 2013-05-12T00:35:18 http://comments.gmane.org/gmane.comp.python.simpy.user/1515 <pre>Hi, I'm trying to figure out how I can use SimPy for my problem. I need to modify the priorities of entities in resource.waitQ each time one of the servers start service to an entities. I read the documents on priorityQ and at some point it is suggested to delete entity and re-introduce it to the queue. However, I could not implement it to waitQ. I really appreciate any help on updating and resorting entities in waitQ somehow. Bests, Mercedeh </pre> Mercedeh TariVerdi 2013-05-02T16:07:04 http://comments.gmane.org/gmane.comp.python.simpy.user/1514 <pre>I'm amazed at how hard it is to get a python program - a simpy simulation - to run deterministically. I'd like to do this to help debug my simulation, and am having a very hard time. I'm using simpy 3 with pseudo-random number generators from numpy, careful to initialize the numpy.random.seed to the same value very early in each run (prior to importing anything other than numpy). I am not using set or dict, since these create non-deterministic iterators. Instead, I'm using collections.OrderedDict - even though the specific order doesn't matter to me when iterating over such dictionaries, that there is a specific deterministic order is sufficient. I don't call sorted on things that contain unordered object references - since that can also create nondeterminism. I have examined all uses of "&lt;" and "&gt;" to make sure none do comparisons on unordered object references. I didn't see any obvious sources of non-determinism in the simpy sources, either. The simulation iterates over tens of thousands</pre> Jonathan Leivent 2013-05-03T02:26:30 http://comments.gmane.org/gmane.comp.python.simpy.user/1509 <pre>Hi everybody, first of all, thank you for your work on Simpy, I just discovered it and it really intrigued me! I would like to use it to model agent-based systems, however, it's not clear to me how big the models can be. AFAIG simpy achieves concurrency through corutines. Is that correct? How can I run a model on multiple processors? Thanks and regards, Mario ------------------------------------------------------------------------------ Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with &lt;2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1 </pre> Mario Ceresa 2013-05-01T23:16:01 http://comments.gmane.org/gmane.comp.python.simpy.user/1508 <pre>It’s been a while since our last status update and we have to admit that not much happened in the default branch during that time. The most visible changes are improved stacktraces for Python 2, better "__repr__" implementations and that events now store their "value"---it can now be accessed at any time via a property of that name. In the background, we have been working on a new implementation of SimPy’s resources and implemented a first draft for the monitoring capabilities. Cheers, Ontje &amp; Stefan------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis &amp; visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter_______________________________________________ Simpy-users mailing list Simpy-users&lt; at &gt;lists.sour</pre> Stefan Scherfke 2013-04-19T06:27:57 http://comments.gmane.org/gmane.comp.python.simpy.user/1506 <pre>Hi All, I am quite new to SimPy, but I love it so much. It's very powerful and easy to implement. I am working on a shuttle service simulation problem. Several vehicles are available to transport passengers waiting at multiple hotels to several tour centers. I formulate each vehicle as a moving server providing batch service. The service time is travel time from hotel to tour center. After transporting passengers to tour center, the vehicle will return empty. Then the server (vehicle) becomes available again. I have known three classes of congestion points, Resource, Level and Store. I just think that none of them are suitable to model a server with batch service. I think there must be some way to tackle this. Or someone has encountered similar problems before. I am just expecting any idea on that. Sorry if this is a duplicate mail. Thanks, Yanshuo ------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of adv</pre> Yanshuo Sun 2013-04-17T13:43:32 http://comments.gmane.org/gmane.comp.python.simpy.user/1505 <pre>Dear Klaus Muller, Tony Vignaux and other friends, I am quite new to SimPy, but I love it so much. It's very powerful and easy to implement. I am working on a shuttle service simulation problem. Several vehicles are available to transport passengers waiting at multiple hotels to several tour centers. I formulate each vehicle as a moving server providing batch service. The service time is travel time from hotel to tour center. After transporting passengers to tour center, the vehicle will return empty. Then the server (vehicle) becomes available again. I have known three classes of congestion points, Resource, Level and Store. I just think that none of them are suitable to model a server with batch service. I think there must be some way to tackle this. Or someone has encountered similar problems before. I am just expecting any idea on that. Thanks a lot, Yanshuo </pre> Yanshuo Sun 2013-04-17T13:27:55 http://comments.gmane.org/gmane.comp.python.simpy.user/1503 <pre>Hi All, I am quite new to SimPy, but I love it so much. It's very powerful and easy to implement. I am working on a shuttle service simulation problem. Several vehicles are available to transport passengers waiting at multiple hotels to several tour centers. I formulate each vehicle as a moving server providing batch service. The service time is travel time from hotel to tour center. After transporting passengers to tour center, the vehicle will return empty. Then the server (vehicle) becomes available again. I have known three classes of congestion points, Resource, Level and Store. I just think that none of them are suitable to model a server with batch service. I think there must be some way to tackle this. Or someone has encountered similar problems before. I am just expecting any idea on that. Thanks, Yanshuo </pre> Yanshuo Sun 2013-04-16T17:11:42 http://comments.gmane.org/gmane.comp.python.simpy.user/1496 <pre>Hi, I am learning simpy to simulate our processes in bank. So far, resources about bank examples were very useful. However now i need a dynamic priority system. In our bank, each customer segment has a service level agreement (SLA) and prioritization is done with earliest deadline first method and i want to simulate this. Can u give an example about dynamic prioritization is it possible with current simpy module? If not, can u suggest me another method (maybe another language). Since i am not an IT worker, i cant dive deeply in programming language so i need some examples to compare. Thank you for your help Sincerely Baran Toppare ------------------------------------------------------------------------------ Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html________________________________</pre> barantoppare< at >gmail.com 2013-04-03T17:33:17 http://comments.gmane.org/gmane.comp.python.simpy.user/1495 <pre>Hi, I am learning simpy to simulate our processes in bank. So far, resources about bank examples were very useful. However now i need a dynamic priority system. In our bank, each customer segment has a service level agreement (SLA) and prioritization is done with earliest deadline first method and i want to simulate this. Can u give an example about dynamic prioritization is it possible with current simpy module? If not, can u suggest me another method (maybe another language). Since i am not an IT worker, i cant dive deeply in programming language so i need some examples to compare. Thank you for your help Sincerely Baran Toppare ------------------------------------------------------------------------------ Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html________________________________</pre> barantoppare< at >gmail.com 2013-04-03T17:47:30 http://comments.gmane.org/gmane.comp.python.simpy.user/1493 <pre>Hi, Will there/is there support of get filters from stores in Simpy 3.0. There does'nt seem to be any mention in the docs. I find them extremely useful in Simpy 2.0 Regards, Neill ------------------------------------------------------------------------------ Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the endpoint security space. For insight on selecting the right partner to tackle endpoint security challenges, access the full report. http://p.sf.net/sfu/symantec-dev2dev_______________________________________________ Simpy-users mailing list Simpy-users&lt; at &gt;lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/simpy-users </pre> Neill Byrne 2013-03-11T12:59:12 http://comments.gmane.org/gmane.comp.python.simpy.user/1486 <pre>Hello, I have written a rather complex model and I've noticed that in very sporadic cases 'yield get,self,level,1' does not block the process on level = Level(name=self.name+'.count',unitName='atom',sim=self.sim,capacity=sys.maxint) and returns None in self.got instead of 1. I'm not reneging so I would expect self.got to be always the required level 1. In which cases should expect that I get None instead? Best Regards, Lorenzo ------------------------------------------------------------------------------ Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the endpoint security space. For insight on selecting the right partner to tackle endpoint security challenges, access the full report. http://p.sf.net/sfu/symantec-dev2dev_______________________________________________ Simpy-users mailing list Simpy-users&lt; at &gt;lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/simpy-users </pre> Lorenzo Di Gregorio 2013-03-09T01:41:57 http://comments.gmane.org/gmane.comp.python.simpy.user/1481 <pre>Hi Guys I've just started using SimPy, and was facing a problem which I hope someone could help me with. I have to run a number of simulations. In general, the basic simulation model will remain the same but certain parameters will change between different runs of the simulations. So if I have to run the code with param1 taking say 3 values (a1,a2,a3), param2 taking 5 values (b1,b2,b3,b4,b5) and param3 taking 5 values (c1,c2,c3,c4,c5), the simulation code needs to run 3*5*5 = 75 times. I have implemented this naively, by making a list with all possible permutations of these parameters list1 = [ [ a1 , b1 , c1] , [ a2, b1, c1] , [ a3, b1, c1] ..... and so on...]. I have simply done the following: for i in range (number_of_runs): update_parameters(i) # updates the parameters using list1 initialize() activate_processes() simulate() Could any one tell me how they run multiple simulations? This approach doesn't seem good to me. Also, if I have to run these 75 simulations, then c</pre> shashank chaudhry 2013-03-06T19:48:45 http://comments.gmane.org/gmane.comp.python.simpy.user/1477 <pre>Here's a simple example showing how to model a propagation delay through a cable. This works when sending messages between processes. For other cases, such as a yield waiting for a process to end, something similar may be done. In Python 3.3 the new 'yield from' mechanism could be used to add latency when waiting for a process to end. -Keith ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb_______________________________________________ Simpy-users mailing list Simpy-users&lt; at &gt;lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/simpy-users </pre> Keith Smith 2013-02-19T18:26:15 http://comments.gmane.org/gmane.comp.python.simpy.user/1476 <pre>Here a simpler version of using pipes to buffer and send messages in between processes. ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb_______________________________________________ Simpy-users mailing list Simpy-users&lt; at &gt;lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/simpy-users </pre> Keith Smith 2013-02-19T18:22:58 http://comments.gmane.org/gmane.comp.python.simpy.user/1474 <pre>The attached file has a set of MKS measurement classes which are very useful in simulation and modeling. One of the great advantages of simpy is that it can deal with events that take place over time intervals of several orders of magnitude. Included in this file is a Time class based on a numpy.ndarray. It can be used just like a float in simpy where it defaults to seconds. The constructor and .u(units) method ease viewing and plotting of simpy time values in the units of choice: {'fs', 'ps','ns','us','ms','s','min','hr','dy','wk','yr'}. I always use the Time class in my simulations as it is much easier to manipulate values, and print/display time in reasonable units for the problem being modeled. The file requires numpy and scipy. It should be possible to create a similar time class which is not dependent on numpy and scipy. -Keith ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end Mar</pre> Keith Smith 2013-02-07T21:15:38 http://comments.gmane.org/gmane.comp.python.simpy.user/1473 <pre>The attached example shows a simulation with cars and police cars share a gas station resource. The police cars will preempt regular cars when they need gas. This example also shows a Probe class which can be used to capture selected simulation state data when a car is preempted. -Keith ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb_______________________________________________ Simpy-users mailing list Simpy-users&lt; at &gt;lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/simpy-users </pre> Keith Smith 2013-02-07T21:07:32 http://comments.gmane.org/gmane.comp.python.simpy.user/1472 <pre>Here's an example that uses Stores for inter-process communication pipes. It also shows how to build a broadcastPipe (one -to-many) and how to model propagation delays I hope you have fun running it Keith ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb_______________________________________________ Simpy-users mailing list Simpy-users&lt; at &gt;lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/simpy-users </pre> Keith Smith 2013-02-07T20:40:37 http://comments.gmane.org/gmane.comp.python.simpy.user/1467 <pre>Do you want Python 2.6 support in SimPy 3? If not, the minimum required Python versions would be 2.7 and 3.2. Python 2.6 will be almost 4.5–5 years old when we release SimPy 3, so we thinking about dropping support for it in SimPy 3. To us, this would make more sense then trying to make SimPy 3 compatible with it and then dropping Python 2.6 support in SimPy 3.1 or 3.2 … What do you think? Cheers, Stefan------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_jan_______________________________________________ Simpy-users mailing list Simpy-users&lt; at &gt;lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/simpy-users </pre> Stefan Scherfke 2013-02-04T21:38:21 http://comments.gmane.org/gmane.comp.python.simpy.user/1461 <pre>Hi all, I've some doubts(listed below), regarding concurrent events in SimPy(2.3). 1. I've never observed *len(self.eventsFired) &gt; 1* in my simulation. Does it have anything to do with inter-event times being floats (eg: .09923sec)? 2. In which order do concurrent events occur? Do we have any control over that? 3. If an event were to occur multiple times (concurrently), can we get that information? Will self.eventsFired[] store the event in duplicate? Lastly, what are the changes to SimEvent mechanism in SimPy -3 It will be really helpful if you could give some hints/ partial answers. Thanks, Arun ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d_______________________________</pre> Arun I B 2013-01-28T16:10:15 Search the mailing list at Gmane query http://search.gmane.org/?group=$group=gmane.comp.python.simpy.user