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x/build: make solaris/smartos builders use a tmpfs #19368
The I/O performance on our Solaris builders seems slow.
(I just did a gomote push of a 42 MB tar.gz and it took much longer than I'm used to for it to unpack remotely.)
Investigate how to do a tmpfs-sorta thing on Solaris for its ephemeral $WORKDIR.
/tmp is always the ram-backed filesystem on Solaris (tmpfs): http://www.c0t0d0s0.org/archives/5815-Less-known-Solaris-features-The-curious-case-of-the-tmp-in-Solaris.html
/var/tmp is the persistent-storage-backed filesystem on Solaris (typically ZFS).
For other custom uses, see 'man tmpfs' or here: