PARI MPQS I/O

[Andy Brown <logic@warthog.com>]

When UNIX PARI does MPQS, it uses several temporary files in /var/tmp.
Tracing the GP process shows it doing a lot of I/O to these files as MPQS
gathers relations.

This is so much I/O that it seems to be a bottleneck.  My Ultra 10 333MHz
is faster than a friend's Alpha 21264 500MHz doing MPQS on >50-digit
composites!

Is there a way to eliminate these temp files, or at least make MPQS write
them less often?