What you describe
My description is accurate. I have just been normally using the computer. Even without any swap, the HDD goes "krrrrrr..." and the system becomes very unresponsive when you begin to run out of memory. You can easily try it yourself, as it is reproducible every time.
It seems to throw out program pages from memory if it knows that they are disk-backed. It seems to be hard to trigger the OOM killer in this condition as well, even though it should happen.
I believe these memory problems can be somewhat mitigated by some hand tuning of the vm parameters "swappiness" and "vfs_cache_pressure". Unfortunately I don't have the time at the moment to setup a good test, but they're worth a shot if you find yourself in that situation in the future. Ref: https://www.suse.com/documenta...
In and of themselves, X-rays from the galactic center aren't unusual. But the X-rays NuSTAR detects don't seem to be associated with structures already known to exist. For example, a supernova remnant named Sgr A East emits low-energy X-rays but not high-energy X-rays. The high-energy blotch doesn't correlate with structures seen in radio images either, such as the dust and gas clouds of Sgr A West that are falling toward the supermassive black hole.
Instead, Perez and her colleagues propose that thousands of stellar corpses could be responsible for the high-energy X-rays: massive (and still-growing) white dwarfs, spun-up pulsars, or black holes or neutrons stars feeding on low-mass companion stars.
All of their proposed solutions, however, have serious problems explaining all of the data.
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