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pb_ds tests are a bottleneck in the testsuite

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org
Date: Mon, 4 Mar 2019 14:22:57 +0000
Subject: pb_ds tests are a bottleneck in the testsuite

I noticed that the ext/pb_ds/regression/trie_set_rand.cc test was the
last one running when all other tests (started with -j40) had finished
some time ago.

That test takes around 30 seconds, even on a fast machine. The 21
tests in the ext/pb_ds/regression/ directory take 3-4 minutes, which
is an incredibly long time for 21 tests when you consider we can run
14000 tests in under ten minutes!

We need to do something about this.

I've attached the times for those tests run on a moderately powerful
laptop. They're all too slow, but some are ridiculous.

Attachment: times
Description: Text document

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