On Wed, Aug 12, 2020 at 06:23:01PM +0200, René Scharfe wrote:
> > This seems to be related to setting SPATCH_BATCH_SIZE to "0". It used to make
> > things go much faster (if you had enough memory), but now seems to just
> > consume tons of CPU. Setting it to "1" finishes the whole thing in ~13
> > minutes of CPU (~2m wall-clock).
>
> This bit me as well, and I settled with SPATCH_BATCH_SIZE = 10. With
> MAKEFLAGS += -j3 I get these number, which are quite similar to yours
> (except I don't dare use more cores due to cooling issues..):
>
> real 4m12,393s
> user 12m15,447s
> sys 0m10,418s
Interestingly, that was slower for me (2m47s wall-clock, with 27m of
CPU). Using "2" is slightly faster than "1". But "3" is a little less
fast, and "4" is slower than "1". So...no clue what is going on.
> > So that's at least a path forward, but in general I have been frustrated
> > with operational aspects of coccinelle like this.
>
> And I was a bit shocked when Coccinelle's testing package became
> unmaintained for a while and I had to compile it from source.
Yeah, I've had various issues with the packaging. For a long time they
had 1.0.7 in experimental, but with no python support. I wonder if it's
worth starting to use python scriptlets in our coccinelle rules, as
described in 4d168e742a (coccinelle: use <...> for function exclusion,
2018-08-28). They're faster and IMHO easier to understand.
Of course I tried it out and got some inscrutable errors:
SPATCH contrib/coccinelle/object_id.cocci
init_defs_builtins: /usr/bin/../lib/coccinelle/standard.h
Python path configuration:
PYTHONHOME = '/lib/x86_64-linux-gnu/..'
PYTHONPATH = '/usr/bin/../lib/coccinelle/python'
program name = 'python3'
isolated = 0
environment = 1
user site = 1
import site = 1
sys._base_executable = '/usr/bin/python3'
sys.base_prefix = '/lib/x86_64-linux-gnu/..'
sys.base_exec_prefix = '/lib/x86_64-linux-gnu/..'
sys.executable = '/usr/bin/python3'
sys.prefix = '/lib/x86_64-linux-gnu/..'
sys.exec_prefix = '/lib/x86_64-linux-gnu/..'
sys.path = [
'/usr/bin/../lib/coccinelle/python',
'/lib/x86_64-linux-gnu/../lib/python38.zip',
'/lib/x86_64-linux-gnu/../lib/python3.8',
'/lib/x86_64-linux-gnu/../lib/python3.8/lib-dynload',
]
Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding
Python runtime state: core initialized
ModuleNotFoundError: No module named 'encodings'
Fun.
-Peff
