Re: [Pgbuildfarm-members] [HACKERS] Reducing buildfarm disk usage: remove temp installs when done

Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
> On 01/20/2015 10:44 PM, Tom Lane wrote:
>> Erm ... no patch attached?

> Oh, darn. Here it is.

I've applied this on dromedary, and it definitely makes a nice dent
in the at-rest space consumption for a full set of branches. The old
data directory contents were

$ du -hsc pgmirror.git HEAD REL*
418M pgmirror.git
367M HEAD
348M REL9_0_STABLE
353M REL9_1_STABLE
356M REL9_2_STABLE
360M REL9_3_STABLE
277M REL9_4_STABLE
2.4G total

Post-patch, with a freshly created data directory (including a
fresh clone from the git server), I've got

$ du -hsc pgmirror.git HEAD REL*
167M pgmirror.git
107M HEAD
86M REL9_0_STABLE
91M REL9_1_STABLE
95M REL9_2_STABLE
100M REL9_3_STABLE
105M REL9_4_STABLE
753M total

It appears that the peak transient space consumption while building a
branch is about 500MB. In addition to these numbers, I've got a shade
under 1GB in ccache space (that's configurable of course, but by default
ccache will eat up to that much). So the total disk space to run a
buildfarm member with ccache was something close to 4GB with the old way,
2.25GB with this patch.

(These numbers aren't totally comparable of course, since the year-old
installation had acquired some git repo bloat which this one hasn't
had time to yet. But any way you slice it, I've saved well more than
1GB of space.)

regards, tom lane