I am trying to do a job shop scheduling resorting to anylogic. I have 20 jobs, 5 machines(resources) and each job has a specific order to visit each machine. In each machine each job has different processing time.
This is what I have right know. I have jobs agent that have a DB table of the machine sequence associated.
This is my jobs agent. I created the collections col_machinesequence(arraylist of strings with op1,op2...where op are the columns of my DB table) and enterblock(arraylist of class Enter where I put my 5 enter blocks)
In each exit block I call the function nextmachine, you can read about it here How to send agents through exit and enter blocks?.
Right know, when I run my project I don't get any error however this is what happens. I guess something in my nextmachine function or in the collection is wrong so this is where I need your help, if anyone may know what is the problem.
I also want to order each job in each machine in order to the shortest processing time. I have this DB table that right know is not associated to any agent. Does anyone know how to do this?
Thank you in advance
Related
I am solving a job shop scheduling problem resorting to anylogic. I have 20 jobs (agents) and 5 machines(resources) and each job as a specific order to visit the machines. My question is: how can I make sure that each job follows its order.
This is what I have done. One agent called 'jobs' and 5 agents, each one corresponding to a machine. One resource pool associated to each one of the service blocks. In the collection enterblocks I selected the 5 enter blocks.
In the agent 'jobs' I have this. The parameters associated to each job, read from the database file, and the collection 'enternames' where I selected the machine(1,2,3,4,5) parameters and the collection 'ptimes' where I put the processing times of the job (This two colletions is where I am not sure I have done it correctly)
My database file
I am not sure how to use the counter used here How to store routings in job shop production in Anylogic. In the previous link the getNextService function is used in the exit blocks but I am also not sure how to use it in my case due to the counter.
Firstly, to confirm that based on the Job agent and database view, the first line in the database will result in a Job agent with values such as:
machine1 = 1 and process1=23
machine2 = 0 and process2=82 and so on
If that is the intent, then a better way is to restructure the database, so there are two tables:
Table of jobs to machine sequence looking something like this:
job
op1
op2
op3
op4
op5
1
machine2
machine1
machine4
machine5
machine3
2
machine4
machine3
machine5
machine1
machine2
3
...
...
...
...
...
Table of jobs to processing time
Then, add a collection of type ArrayList of String to Job (let's call this collection col_machineSequence) and when the Job agents get created their on startup code should be:
for (String param : List.of("op1","op2","op3","op4","op5")) {
col_machineSequence.add(getParameter(param));
}
As a result, col_machineSequence will contain sequence of machines each job should visit in the order defined in the database.
NOTE: Please see help on getParameter() here.
Also:
Putting a Queue in front of the Service isn't necessary
Repeating Enter-Queue-Service-Exit isn't necessary, this can be simplified using this method
Follow-up clarifications:
Collections - these will be enclosed in each Job agent
Queue sorting - Service block has Priorities / preemption which governs the ordering on the queue
Create another agent for the second table (call the agent ProcessingTime and table processing_time) and add it to the Job agent and then load it from database filtering on p_jobid as shown in the picture
I would like to connect 2 sources from different processes. In the second process it should pick my pallets from a pallet rack where I stored them in my first process flow.
Process 1: Store the pallets into my pallet racks.
Process 2: Pick this number of pallets to a certain time.
Can I connect this processes/ the both source blocks? Its easier for my project to seperat this process.
I know that it is possible with enter and exit but I would like to know if it is with source too
well... a source generates a completely new agent, and the enter block doesn't, so that's why you should use an enter block instead...
BUT theoretically, you could eventually remove the agent with a sink and create a new one, identical to the previous one with a source... but I don't see why you would do something like that besides a desperate attempt to save memory.... bad practice at its peak.
The real reason why you want to do this, is that you are not aware of the tools that AnyLogic has available to solve whatever you are trying to solve... maybe you are looking for a split block and separate your agent into 2 different processes? Doesn't seem so, since process 1 occurs before process 2, so i dont see why you would even want to separate them
My company has a couple of joblets that we put in new jobs to do things like initialization of variables, get system information from the database and sending out error / warning emails. The issue we are running into is that if we go ahead and start creating the components of a job and realize that we forgot to include these 3 joblets, we have to basically re-create the job to ensure that the joblets are added first so they run first.
Is there any way to force these joblets to run first and possibly also in a certain order before moving on to the contents of the job being created? Please let me know if there is any information you may need that I'm missing as I have only been using Talend for a few days. The rest of the team has not been using it too much longer than I have, so they do not have the answer I'm looking for either. Thanks in advance!
In Joblets you can use the components Trigger_Input and Trigger_Output as connection-points for on subjob OK triggers. So you can connect joblets and other components in a job with triggers. Thus enforcing execution order.
But you cannot get a on subjob OK trigger from a tPreJob. I am thinking on triggering from a tPreJob to a tWarn (on component OK) and then from tWarn to the joblet (on subjob OK).
I have a program, it loads a few tasks from a file prepared by user and start executing them according the scheduling shown in the file.
Example: taskFile.txt
Task1: run every hour
Task2: run every 2 seconds
...
TaskN: run every monday at 10:00
This first part is Ok, i solved by using ScheduledExecutorService and i am very satisfied. The tasks are load and run as they should.
Now, let's image that the user, by GUI (at runtime), decides that Task2 should run every minute, and he wants to remove Task3.
I cannot find any way to access one specific task in the pool, in order to remove/modify it.
So I cannot update tasks at runtime. When user changes a task, I can only modify the taskFile.txt and restart the application, in order to reload all tasks according the newly updated taskFile.txt.
Do you know any way to access a single task in order to modify/delete it?
Or even, a way to remove one given task, so i can insert a new one in the pool, with the modifications wanted by the user.
Thanks
This is not elegant, but works.
Let's suppose you need 10 threads, and sometimes you need to manage a specific thread.
Instead to have a pool with 10 thread, use 10 pools with one thread for each, keep them in your favourite data structure, and act on the pool_1 when you want to modify thread_1.
It's possible to remove the older Runnable from the pool and put a new one with the needed changes.
Otherways, anything put in the pool became anonymous and will be not directly manageable.
If somebody has a better solution...
There is a problem when several users can process the same cube simultaniously and as a result processing of cube fails. So I need to check if certain cube is processing at current moment.
I dont think you can prevent a cube from being processed if someone else is already processing it. What you can do to "help" is run a MDX query to check the last time the cube was processed:
SELECT CUBE_NAME, LAST_DATA_UPDATE FROM $System.MDSCHEMA_CUBES
or check the sys.process table on the realted sql server instance to see if it is running:
select spid, ecid, blocked, cmd, loginame, db_name(dbid) Db, nt_username, net_library, hostname, physical_io,
login_time, last_batch, cpu, status, open_tran, program_name
from master.dbo.sysprocesses
where spid > 50
and loginame <> 'sa'
and program_name like '%Analysis%'
order by physical_io desc
go
use this code to select running processes: (execute this in OLAP)
select *
from $system.discover_Sessions
where session_Status = 1
And this code to cancel running prossesess ! Please change PID to running SESSISONS_SPID
like in example:
<Cancel xmlns ="http://schemas.microsoft.com/analysisservices/2003/engine">
<SPID>92436</SPID>
<CancelAssociated>1</CancelAssociated>
</Cancel<
Probably a better approach to the ones already listed would be to use SQL Server Profiler to watch activity on the Analysis Server. As stated already, the current popular answer has two flaws, the first option only shows the LAST time the cube had been processed. And the second option only shows if something is running. But it doesn't tell you what is running and what if your cube was not processing from a SQL server but a different data source?
Utilizing SQL Server Profiler will tell you not only if something is processing but also details of what is processing. Most of the Events you can filter out. Watch Progress Report Current events if you want real time information... It's usually too much of a fire-hose of data to get real info out of it, but you'll know well that at least a process is going on. Watch Progress Report Begin and End events only to get better information like what is currently being processed, even down to the partition levels. Other events with good information include Command Begin/End and Query Begin/End.
You will see a job running in Task Manager called "MSDARCH" if a cube is processing. Not sure how you can tell which one though.