Number of units in a batch

[Richard Kuhlmeijer]

Hello!

I’m modelling shipment consolidation policies in simmer and I want to include a timeout function based on the batch size to simulate the loading time of a truck. I am able to do this for a quantity policy because the batch size is predetermined. However, when modelling a time policy I want to use only the timeout option in the batch function without batch size (batch(timeout=…)). Is there a way to get the number of units in a batch and using this number in a timeout function? The number of units in a batch (and thus the length of the timeout function) would be different for every batch.

Thankyou in advance!

[Iñaki Ucar]

Hi,

On Thu, 10 Jun 2021 at 16:19, Richard Kuhlmeijer <r.kuhl...@gmail.com> wrote:

Hello!

I’m modelling shipment consolidation policies in simmer and I want to include a timeout function based on the batch size to simulate the loading time of a truck. I am able to do this for a quantity policy because the batch size is predetermined. However, when modelling a time policy I want to use only the timeout option in the batch function without batch size (batch(timeout=…)). Is there a way to get the number of units in a batch and using this number in a timeout function? The number of units in a batch (and thus the length of the timeout function) would be different for every batch.

I'm not sure if I follow. The timeout option triggers a batch regardless of the batch count, and it's defined by the first arrival for every new batch (so subsequent arrivals in the same batch do not call the timeout function).

So, in other words, the current implementation only allows you to set fixed batch sizes or variable timeouts (variable across batches, but fixed for a given batch). My understanding is that you are trying to define variable batch sizes. This is not currently possible. But given the popularity of such a use case, I'll consider this as a future enhancement.

Meanwhile, as a workaround, you could define multiple trajectories with different batch sizes, and decide which one you follow using a branch().

Iñaki

 

Thankyou in advance!

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Iñaki Úcar

[Richard Kuhlmeijer]

Thankyou for your answer!

To be more clear about my question, I wondered if there is a way to get the batch count of a certain batch after it is triggered by a fixed timeout within the batch function and use this batch count later on in the trajectory to simulate longer loading time for larger batch count. As a results batches would vary in size and larger batches would have longer loading time later on in the system.

I hope my question is more clear now!

Op donderdag 10 juni 2021 om 19:03:12 UTC+2 schreef iu...@fedoraproject.org:

[Iñaki Ucar]

On Fri, 11 Jun 2021 at 15:07, Richard Kuhlmeijer <r.kuhl...@gmail.com> wrote:

Thankyou for your answer!

To be more clear about my question, I wondered if there is a way to get the batch count of a certain batch after it is triggered by a fixed timeout within the batch function and use this batch count later on in the trajectory to simulate longer loading time for larger batch count. As a results batches would vary in size and larger batches would have longer loading time later on in the system.

I hope my question is more clear now!

Oh, I see. What about using a global attribute as a counter? Something like

set_global("batch_count", 1, mod="+") %>%

batch(Inf, timeout=function() get_global(env, "timeout")) %>%

set_global(c("batch_count", "timeout"), function() {

  c(0, get_global(env, batch_count))

}) %>%

....

Iñaki

 

Op donderdag 10 juni 2021 om 19:03:12 UTC+2 schreef iu...@fedoraproject.org:

Hi,

On Thu, 10 Jun 2021 at 16:19, Richard Kuhlmeijer <r.kuhl...@gmail.com> wrote:

Hello!

I’m modelling shipment consolidation policies in simmer and I want to include a timeout function based on the batch size to simulate the loading time of a truck. I am able to do this for a quantity policy because the batch size is predetermined. However, when modelling a time policy I want to use only the timeout option in the batch function without batch size (batch(timeout=…)). Is there a way to get the number of units in a batch and using this number in a timeout function? The number of units in a batch (and thus the length of the timeout function) would be different for every batch.

I'm not sure if I follow. The timeout option triggers a batch regardless of the batch count, and it's defined by the first arrival for every new batch (so subsequent arrivals in the same batch do not call the timeout function).

So, in other words, the current implementation only allows you to set fixed batch sizes or variable timeouts (variable across batches, but fixed for a given batch). My understanding is that you are trying to define variable batch sizes. This is not currently possible. But given the popularity of such a use case, I'll consider this as a future enhancement.

Meanwhile, as a workaround, you could define multiple trajectories with different batch sizes, and decide which one you follow using a branch().

Iñaki

 

Thankyou in advance!

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Iñaki Úcar

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Iñaki Úcar