Re: [HTCondor-users] Arbitrarily limit the number of dynamic slots

[Cole Bollig <cabollig@xxxxxxxx>]

Hi Charles,

You should be able to achieve this by making sure all of the resources are consumed by the Nth slot. To do this you can set MODIFY_REQUEST_EXPR_REQUESTCPUS = quantize(RequestCpus, {x}). This will reset a jobs RequestCpus to the minimal number that the original request fits into based on intervals of x. So, if your TotalCpus is 64 and a job RequestCpus <= x will result in:

x -> Max Num Slots

1 -> 64

2 -> 32

4 -> 16

8 -> 8

Hope this helps,

Cole Bollig

---

From: HTCondor-users <htcondor-users-bounces@xxxxxxxxxxx> on behalf of Charles Goyard <cgoyard@xxxxxxx>
Sent: Wednesday, January 18, 2023 9:06 AM
To: HTCondor Users <htcondor-users@xxxxxxxxxxx>
Subject: [HTCondor-users] Arbitrarily limit the number of dynamic slots

 

Hi all,


I just started deploying dynamic slots on my pool (Debian, HTCondor 10),
and it works well.  However, I would like to set an arbitrary limit on
the number of slots than can be created on a single machine.

This is because our sweet spot is somewhere around 6 to 8 jobs running
in parallel.

I could use predefined, static slots to the same effect, but I was
wondering if there is a way to keep dynamic slots and state : "this
machine can be cut in 6 at most".

My setup is very simple for dynamic slots, as it is only :

use feature:PartitionableSlot


I think I already read a conversation about this on this mailing-list,
but I could not find it.


Thanks,

--
Charles
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