NOCOMMIT: log peak mem usage and swapouts to debug test-llava-runner

[swolchok]

Attempting to test my theory that the timestamp gaps in #8180 are caused by swapping.

[swolchok]

Stack from ghstack (oldest at bottom):

• -> NOCOMMIT: log peak mem usage and swapouts to debug test-llava-runner #8192

[pytorch-bot]

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[swolchok]

initial run inconclusive (did not demonstrate swapping, but can't rule it out yet); there was a timestamp gap in the middle of the added log messages, but they were demonstrably all generated with a timestamp before the end of the gap. Adding another log message at what seems to be a better place and retrying.

[swolchok]

OK I think I'm satisfied that we're not swapping. https://github.com/pytorch/executorch/actions/runs/13144066347/job/36677928636?pr=8192