set_var_default not working (on Isambard3)

[tkoskela]

excalibur-tests/benchmarks/examples/stream/stream.py

Lines 43 to 46 in 65c9df7

	self.set_var_default(
	'num_cpus_per_task',
	(self.current_partition.processor.num_cpus or 1) //
	min(1, (self.current_partition.processor.num_cpus_per_core or 1)))

print(self.num_cpus_per_task) prints None. Replacing it with

self.num_cpus_per_task = (self.current_partition.processor.num_cpus or 1) // min(1, (self.current_partition.processor.num_cpus_per_core or 1))

works (ie, prints the correct number of cpus, 144)

[giordano]

Replacing it with

self.num_cpus_per_task = (self.current_partition.processor.num_cpus or 1) // min(1, (self.current_partition.processor.num_cpus_per_core or 1))

That'd override values set on the command line. I don't see how self.num_cpus_per_task can be None, at very least you should get None for the other attributes used to set its default value.

[tkoskela]

As far as I can tell, the code to compute the value of num_cpus_per_task is working correctly, but the value doesn't get assigned by set_var_default()

self.current_partition.processor.num_cpus: 144
current_partition.processor.num_cpus_per_core: 1
(self.current_partition.processor.num_cpus or 1) // min(1, (self.current_partition.processor.num_cpus_per_core or 1)): 144
self.num_cpus_per_task: None

[giordano]

Uhm, this needs some debugging then, sounds like a potential bug in set_var_default. Version of reframe?

[tkoskela]

I'm guessing the value None has been assigned to it previously so this check in ReFrame returns True

https://github.com/reframe-hpc/reframe/blob/7930201e4c9c227e70ae94d70d5ae4b101abcbd7/reframe/core/pipeline.py#L1396C2-L1397C39

[tkoskela]

I'm on ReFrame 4.7.0

[giordano]

I've been trying to look into this, I updated to ReFrame v4.7.0 but set_var_default seems to do the job for me in the stream benchmark. But I'm testing this locally, I don't have access to Isambard 3.

[tkoskela]

Sigh, issue with python versions then?

[giordano]

For what is worth locally I have Python 3.12.7.