On 11/09/2012 08:08 PM, Jesse Keating wrote:
On 11/09/2012 09:57 AM, Panu Matilainen wrote:
Except that rpm (and yum) use a lot LESS memory these days than they did
in the RHEL-5 era, which I think was used as a comparison here. That's
not where all the memory has gone, quite the contrary.
While that may be true, the amount of ram (free -m) used during an
install *triples* when we get to the desolve and package install phase.
In my most recent test the "used" number went from roughly 550m just
before the packages step to 1645 during.
Hmm, not sure how meaningful the 'free' output is for memory use
(process RSS is what I look at), but that is just way, way, way off. The
depsolve + install stage obviously does need a very non-trivial amount
of memory that anaconda wouldn't have required up to that point, but we
should be talking about a *couple* of hundred megs at most for normal
Fedora install/upgrade cases.
The one testcase I have at hand is a 3103 package install of F16 x86_64
DVD contents into an empty chroot. That's roughly the double the size of
an avegare/default installation, and the memory peak for that set when
installing with rpm is circa 100M resident size (RSS). Yum does add a
fair share of overhead but even if it doubled or tripled the memory use
(its been a while since I last looked and dont remember offhand), its
still nowhere near a gigabyte of additional memory.
Probably the biggest anaconda memory requirement jump I recall around
Fedora 15 had to do with the overall layout changes (moving to one big
initrd or something like that), not the actual anaconda process memory
requirements. That's when I last looked at this and provided patches to
save memory in the package installation area... but perhaps I should
look at it again.
- Panu -
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