Re: [HTCondor-users] advertising unequal memory per CPU

[Cole Bollig <cabollig@xxxxxxxx>]

Hi Paul,

This is doable by setting up slot types in the Startd configuration like:

SLOT_TYPE_1 = cpus=1, ram=1/32

SLOT_TYPE_2 = cpus=1, ram=2/32

NUM_SLOTS_TYPE_1 = 16

NUM_SLOTS_TYPE_2 = 4

This above configuration will create 2 types of slots with different available resources. TYPE_1 which has 1 CPU and 1GB of RAM, and TYPE_2 which has 1 CPU and 2GB RAM. With those 2 types declared you can then declare the number of Slots desired for the machine with the NUM_SLOTS_TYPE_(#). Here is a link to the documentation of this feature: HTCondor Custom Slot Resource Allocation. I would also like to note that you need to restart the startd daemon for the slots to be created correctly.

Hope this helps,

Cole Bollig

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From: HTCondor-users <htcondor-users-bounces@xxxxxxxxxxx> on behalf of Paul T Baker <ptbaker@xxxxxxxxxxx>
Sent: Monday, February 27, 2023 10:52 AM
To: htcondor-users@xxxxxxxxxxx <htcondor-users@xxxxxxxxxxx>
Subject: [HTCondor-users] advertising unequal memory per CPU

 

Hello,

I would like to have different CPUs on the same machine advertise unequal amounts of memory.

I'm running a local condor instance on a single machine with 32 CPUs and 32 GB of RAM.  I would like to set the condor pool to use 20 of the CPUs, and have two different memory amounts advertised:

16x 1 GB

4x 2 GB

Currently, I'm setting RESERVED_MEMORY=8 GB and MAX_NUM_CPUS=20 in my config file to hold back the resources I want.  This results in all 20 CPUs advertising the same (24 GB / 20) = 1.2 GB of memory.  Is there a way to set the memory per CPU advertised to be unequal?

Thanks,

Paul

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Paul T Baker   (he/him)
Assistant Professor of Physics
Widener University