[Bug 343714] Re: Kubuntu Jaunty KDE 4.2 very high memory usage

[hronir]

Even without swap partition mounted the system crashed.
Coming back with atop, it turns out that it was willing to write to a swap partition anyway (and I guess it crashed because there is no partition available just like it was crashing when the partition was there but it was full).
This (*) is an example of what atop says for the period when the system crashed.
This means that the system would like to commit 2.2GB of virtual memory (vmcom) having 0.0MB of swap partition (SWP tot) and a vmlim of 1.0GB (from man atop I read that 'vmlim' is by default swap size plus 50% of memory size, and that the committed space is the reserved virtual space for all allocations  of  private  memory  space for processes. The kernel only verifies whether the committed space exceeds the limit if strict overcommit handling is configured (i.e. if vm.overcommit_memory  is 2, but in my case it is 0).

(*)
MEM | tot    2.0G | free   74.4M | cache   1.4G | buff   24.6M | slab   35.8M |
SWP | tot    0.0M | free    0.0M |              | vmcom   2.2G | vmlim   1.0G |
PAG | scan  37568 | stall      0 |              | swin       0 | swout      0 |
DSK |         sda | busy      0% | read     188 | write   1436 | avio    1 ms |
DSK |         sdc | busy      0% | read      72 | write      9 | avio   13 ms |
DSK |         sdb | busy      0% | read      67 | write      9 | avio    1 ms |

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Kubuntu Jaunty KDE 4.2 very high memory usage
https://bugs.launchpad.net/bugs/343714
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