Re: test suite run time

[Jonathan Wakely <jwakely dot gcc at gmail dot com>]

On 2 October 2013 19:43, Jonathan Wakely wrote:
> On 17 September 2013 22:48, Mike Stump wrote:
>> I was doing a -j32 build and test suite run and noticed:
>>
>>           normal7) \
>>             dirs="`cd $$srcdir; echo 2[68]_*/*`";; \
>>
>> was the long leg.
>
> Yes, that's taking *significantly* longer than the other legs, we
> should rebalance them. I'll have a look at that some time.

The slow part of the normal7 target is the testsuite/28_regex
directory, which has lots of new tests in.  I don't know why most
regex tests take several seconds to compile, is it just the number of
template instantiations or are we missing something from a precompiled
header, or should we have some explicit instantiations in the library?

A small improvement would be to move the 26_numerics tests to a
different target:

diff --git a/libstdc++-v3/testsuite/Makefile.am
b/libstdc++-v3/testsuite/Makefile.am
index 4c92fef..2f4158f 100644
--- a/libstdc++-v3/testsuite/Makefile.am
+++ b/libstdc++-v3/testsuite/Makefile.am
@@ -148,9 +148,9 @@ check-DEJAGNU $(check_DEJAGNU_normal_targets):
check-DEJAGNU%: site.exp
          normal5) \
            dirs="`cd $$srcdir; echo 23_*/[luv]*`";; \
          normal6) \
-           dirs="`cd $$srcdir; echo 2[459]_*/*`";; \
+           dirs="`cd $$srcdir; echo 2[4569]_*/*`";; \
          normal7) \
-           dirs="`cd $$srcdir; echo 2[68]_*/*`";; \
+           dirs="`cd $$srcdir; echo 28_*/*`";; \
          normal8) \
            dirs="`cd $$srcdir; echo 27_*/*`";; \
          normal9) \

That still leaves normal7 as the slowest step, but only a couple of
minutes longer.


Should we try to do better with more careful juggling, or should we
try to speed up the regex tests?