On Sun, Aug 11, 2019 at 2:57 AM Georg Sauthoff <m...@georg.so> wrote:
> On Fri, Aug 09, 2019 at 03:50:43PM -0600, Chris Murphy wrote:
> [..]
> > Problem and thesis statement:
> > Certain workloads, such as building webkitGTK from source, results in
> > heavy swap usage eventually leading to the system becoming totally
> > unresponsive. Look into switching from disk based swap, to swap on a
> > ZRAM device.
> >
> > Summary of findings (restated, but basically the same as found at [2]):
> > Test system, Macbook Pro, Intel Core i7-2820QM (4/8 cores), 8GiB RAM,
> > Samsung SSD 840 EVO, Fedora Rawhide Workstation.
> > Test case, build WebKitGTK from source.
> [..]
> To avoid such issues I disable swap on my machines. I really don't see
> the point of having a swap partition if you have 16 or 32 GiB RAM. Even
> with 8 GiB I disable swap.

Disabling swap doesn't avoid the issues, it can in fact make them worse.

If you have apps allocate memory they don't always OOM before the
kernel tries to evict text pages, but since SSDs are fast it then
tries to pull back in those text pages before realising (that is what
most of the latest rounds of articles has been about). Something like
firefox runs with no swap, starts to need more memory than the system
has, parts of firefox executable get paged out, but then are needed
for firefox to use the RAM, and round in circles it goes.

Having swap is still in this day and age better for your system that
not having it.

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