I can't reproduce this on master. It seems to run in ~17s there which is
not great but roughly in line with what I would expect.
I agree with Brandon that it seems more likely something in your tree
(test, ghc, something else) introduced the slowdown.
On 27/09/2026 23:07, Brandon Allbery via ghc-devs wrote:
TBH that doesn't sound like hadrian is slow, it sounds like the test
harness or the tests themselves (maybe RTS startup/shutdown?) are and
hadrian's giving you the play-by-play from it.
On Sun, Sep 27, 2026 at 4:37 PM Simon Peyton Jones via ghc-devs
<[email protected]> wrote:
Friends
Is it my imagination or has Hadrian become a LOT slower?
I am trying to run a single test, thus:
hadrian/build -j6 \
--flavour=perf+no_profiled_libs+ticky_ghc \
test \
--skip=_build/stage0/** \
--skip=_build/stage1/** \
--skip=_build/stage1/rts/** \
--skip=_build/stage1/libraries/** \
--skip=_build/stage1/utils/** \
--docs=none \
--only=ClassOperator
This takes 70 seconds, of which almost all is spent with Hadrian
saying stuff below
*Something must be wrong! *
Seventy seconds to run one test! Then to accept the new output is
another 70 seconds. If I have a couple of dozen test-output
wibbles to fix, that adds up to a lot of time.
Simon
]0;Starting...(/home/simonpj/code/HEAD-31) ]0;Running for 5s
[119/38037], predicted 264m08s (0%)(/home/simonpj/code/HEAD-31)
]0;Running for 10s [8853/38038], predicted 36m59s
(0%)(/home/simonpj/code/HEAD-31) ]0;Running for 15s [12109/38038],
predicted 9m46s (2%)(/home/simonpj/code/HEAD-31) ]0;Running for
20s [13119/38038], predicted 7m03s
(4%)(/home/simonpj/code/HEAD-31) ]0;Running for 25s [13879/38038],
predicted 7m19s (5%)(/home/simonpj/code/HEAD-31) ]0;Running for
30s [14485/38038], predicted 6m58s
(6%)(/home/simonpj/code/HEAD-31) ]0;Running for 35s [15338/38038],
predicted 6m06s (8%)(/home/simonpj/code/HEAD-31) ]0;Running for
40s [16434/38038], predicted 2m56s
(17%)(/home/simonpj/code/HEAD-31) ]0;Running for 45s
[20588/38038], predicted 3m32s (16%)(/home/simonpj/code/HEAD-31)
]0;Running for 50s [26354/38038], predicted 63m21s
(1%)(/home/simonpj/code/HEAD-31) ]0;Running for 55s [30040/38038],
predicted 49m36s (1%)(/home/simonpj/code/HEAD-31) ]0;Running for
1m00s [35123/38038], predicted 19m59s
(4%)(/home/simonpj/code/HEAD-31) # ghc
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brandon s allbery kf8nh
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