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< Advanced Erlang/OTP ~ limiting the max. reductions of a process |
| zghst |
 Posted: Sat Aug 15, 2009 12:46 pm |
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Joined: 15 Aug 2009
Posts: 6
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hello.
I'd like specify the max number of reductions of a process at spawn. (for the reduction number as found in process_info). When it goes over, the process should be killed.
I think I read Erlang switches between processes every x reductions. Could I hack into the system somehow to do this extra check here (and kill the process if needed)? I'm not very familiar with the erlang source code. Does anyone know if this would be a hard thing to do?
Or I could make a separate process with a higher priority to check all the reduction numbers every 100 ms or so.
Any ideas on how to best do this? Thanks for the help |
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| zghst |
| Posted: Sat Aug 15, 2009 1:23 pm |
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Joined: 15 Aug 2009
Posts: 6
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| I'd also like to get the number of reductions a process did along with the 'EXIT' message somehow. So I can know how many reductions each process did at the time of exit. (Calling process_info for the reductions number on a dead process doesnt work) |
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| uwiger |
| Posted: Sat Aug 15, 2009 5:20 pm |
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Joined: 03 Jul 2006
Posts: 604
Location: Sweden
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zghst wrote: hello.
I'd like specify the max number of reductions of a process at spawn. (for the reduction number as found in process_info). When it goes over, the process should be killed.
This is not supported, unfortunately.
I do something like that in ErlHive, but it's done through source transforms in a controlled environment.
You could create your own behaviour on top of e.g. gen_server or gen_fsm, and insert this sort of check before you hand over to the callbacks.
BR,
Ulf W |
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| zghst |
| Posted: Sun Aug 16, 2009 6:36 am |
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Joined: 15 Aug 2009
Posts: 6
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hi, thanks for the reply
Adding a check before the call handle is a cool idea. But all this seems like a lot of trouble/overhead, when it just seems like adding a simple check in the erlang runtime system (since they already keep the reduction number).
Would this be possible to add in erts/emulator/beam/erl_process.c somewhere? (Just making the scheduler skip the process would work for me, i think) |
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| wuji |
| Posted: Thu Aug 30, 2012 6:39 am |
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