Something is amiss between -fext-core and optimisations.
Validating (--testsuite-only --slow) brought my box to its knees badly, the
culprit turned out to be T7239 with the optasm, hpc, and optllvm ways:
=====> T7239(hpc) 1434 of 3536 [0, 4, 0]
cd ./ext-core && '/home/dafis/GHC/bghc/bindisttest/install dir/bin/ghc' -
fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-db -
rtsopts -fno-ghci-history -c T7239.hs -O -fhpc -fext-core >T7239.comp.stderr
2>&1
Compile failed (status 256) errors were:
stack overflow: use +RTS -K<size> to increase it
*** unexpected failure for T7239(hpc)
Running it manually,
$ /home/dafis/GHC/bghc/inplace/bin/ghc-stage2 +RTS -s -M1200M -RTS -fforce-
recomp -rtsopts -c T7239.hs -O -fllvm -fext-core > T7239.comp.stderr 2>&1
dafis@schwartz:~/GHC/bghc/testsuite/tests/ext-core> cat T7239.comp.stderr
ghc-stage2: Heap exhausted;
Current maximum heap size is 1258291200 bytes (1200 MB);
use `+RTS -M<size>' to increase it.
1,938,087,952 bytes allocated in the heap
1,835,432,552 bytes copied during GC
1,241,472,688 bytes maximum residency (19 sample(s))
174,344,440 bytes maximum slop
1673 MB total memory in use (8 MB lost due to fragmentation)
Tot time (elapsed) Avg pause Max pause
Gen 0 954 colls, 0 par 1.79s 1.79s 0.0019s 0.0054s
Gen 1 19 colls, 0 par 10.10s 10.20s 0.5369s 1.7456s
TASKS: 3 (1 bound, 2 peak workers (2 total), using -N1)
SPARKS: 0 (0 converted, 0 overflowed, 0 dud, 0 GC'd, 0 fizzled)
INIT time 0.00s ( 0.03s elapsed)
MUT time 0.74s ( 0.82s elapsed)
GC time 11.89s ( 11.99s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 12.63s ( 12.85s elapsed)
Alloc rate 2,629,160,866 bytes per MUT second
Productivity 5.9% of total user, 5.8% of total elapsed
gc_alloc_block_sync: 0
whitehole_spin: 0
gen[0].sync: 0
gen[1].sync: 0
it gobbles up a lot of memory, rendering the box unresponsive for several
minutes if the heap isn't restricted to be small enough.
Removing either -O or -fext-core makes it well-behaved.
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