Mark Shannon added the comment:
PyType_ClearCache() is documented as:
Clear the internal lookup cache. Return the current version tag.
Modifying it to do what it is documented to do fixes this bug :)
--
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Change by Mark Shannon :
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pull_request: https://github.com/python/cpython/pull/27773
___
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Mark Shannon added the comment:
Thanks for putting in the effort to find this.
I think the first step to fixing this is to formalize the semantics of
`tp_version_tag`. Initially it was designed just for the method cache, but we
have started using it as a unique identifier for the state of a
Mark Shannon added the comment:
A recursion limit of 30 is effectively infinite.
With a debug build of 3.11, the time to execute grows very fast indeed,
probably super-exponentially.
mark@nero:~/repos/cpython$ time ./python ~/test/test.py 15
real0m1.107s
user0m1.099s
sys
Mark Shannon added the comment:
This looks like a duplicate of https://bugs.python.org/issue42951
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Mark Shannon added the comment:
Duplicate of https://bugs.python.org/issue40116
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Change by Mark Shannon :
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Mark Shannon added the comment:
I guess this will be resolved when the great PEP 563/649 debate is concluded.
No need for another issue.
--
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stage: patch review -> resolved
status: open -> closed
___
Python tracke
Mark Shannon added the comment:
I'd like to close this, as the exception handling is all done and working
correctly.
Is there a separate issue for how we are handling CodeType()?
--
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Python tracker
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Mark Shannon added the comment:
Ned, is this still an issue with the release candidate of 3.10?
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Mark Shannon added the comment:
I believe this to be fixed.
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Change by Mark Shannon :
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keywords: +patch
pull_requests: +26220
stage: -> patch review
pull_request: https://github.com/python/cpython/pull/27741
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New submission from Mark Shannon :
PEP 659 quickening provides a mechanism for replacing instructions.
We should exploit this to implement superinstructions when quickening.
See https://github.com/faster-cpython/ideas/issues/16
--
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nosy: Mark.Shannon
priority: normal
Mark Shannon added the comment:
New changeset 8ac0886091c27bf4b6bb0a9b571e174b554d31a4 by Irit Katriel in
branch 'main':
bpo-44890: collect specialization stats if Py_DEBUG (GH-27731)
https://github.com/python/cpython/commit/8ac0886091c27bf4b6bb0a9b571e174b554d31a4
-
Change by Mark Shannon :
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Mark Shannon added the comment:
New changeset a530a9538f3f444bebd2d2b71fe5f2e747e76d73 by Mark Shannon in
branch 'main':
bpo-44878: Remove loop from interpreter. All dispatching is done by gotos.
(GH-27727)
https://github.com/python/cpython/commit/a530a9538f3f444bebd2d2b71fe5f2
Change by Mark Shannon :
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pull_requests: +26208
pull_request: https://github.com/python/cpython/pull/27727
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Python tracker
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Mark Shannon added the comment:
New changeset f66d00fdd7e9a333accc6bf0e37173051aaa55d0 by Mark Shannon in
branch 'main':
bpo-44878: Remove the switch from the main interpreter loop when using computed
gotos. (GH-27726)
https://github.com/python/cpyt
Change by Mark Shannon :
--
pull_requests: +26206
pull_request: https://github.com/python/cpython/pull/27726
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Python tracker
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Mark Shannon added the comment:
New changeset 3f3d5dcac336463bd0eed64ba0bd7666ff2da1e1 by Mark Shannon in
branch 'main':
bpo-44878: _PyEval_EvalFrameDefault readability improvements (GH-27725)
https://github.com/python/cpython/commit/3f3d5dcac336463bd0eed64ba0bd76
Change by Mark Shannon :
--
pull_requests: +26205
pull_request: https://github.com/python/cpython/pull/27725
___
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Change by Mark Shannon :
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pull_requests: +26199
stage: -> patch review
pull_request: https://github.com/python/cpython/pull/27715
___
Python tracker
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New submission from Mark Shannon :
On entering the interpreter (_PyEval_EvalFrameDefault) we need to check for
tracing in order to record the call.
However, we don't do this cleanly resulting in slow dispatch to the
non-quickened instruction on every call/next.
--
ass
Change by Mark Shannon :
--
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pull_request: https://github.com/python/cpython/pull/27708
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Change by Mark Shannon :
--
resolution: -> fixed
stage: patch review -> resolved
status: open -> closed
type: -> performance
___
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Change by Mark Shannon :
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resolution: -> fixed
stage: patch review -> resolved
status: open -> closed
___
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Change by Mark Shannon :
--
resolution: -> fixed
stage: patch review -> resolved
status: open -> closed
___
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Mark Shannon added the comment:
New changeset ac75f6bdd4748b3378dd321f862d13aa1898f77a by Mark Shannon in
branch 'main':
bpo-44826: Specialize STORE_ATTR (GH-27590)
https://github.com/python/cpython/commit/ac75f6bdd4748b3378dd321f862d13
Change by Mark Shannon :
--
pull_requests: +26161
pull_request: https://github.com/python/cpython/pull/27673
___
Python tracker
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Mark Shannon added the comment:
New changeset b854557b49083d8625a433eb36aacb0c87d67c52 by Mark Shannon in
branch 'main':
bpo-44840: Compiler: Move duplication of exit blocks with no line numbers to
after CFG optimization. (GH-27656)
https://github.com/python/cpyt
Change by Mark Shannon :
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pull_requests: +26150
stage: -> patch review
pull_request: https://github.com/python/cpython/pull/27656
___
Python tracker
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Mark Shannon added the comment:
New changeset cee67fa66129b5d1db5c8aa3884338f82f0da3de by Mark Shannon in
branch 'main':
bpo-44821: Eagerly assign __dict__ for new objects. (GH-27589)
https://github.com/python/cpython/commit/cee67fa66129b5d1db5c8aa3884338
Change by Mark Shannon :
--
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pull_requests: +26092
stage: -> patch review
pull_request: https://github.com/python/cpython/pull/27590
___
Python tracker
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Change by Mark Shannon :
--
keywords: +patch
pull_requests: +26091
stage: -> patch review
pull_request: https://github.com/python/cpython/pull/27589
___
Python tracker
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New submission from Mark Shannon :
Add specializations of STORE_ATTR following the pattern of LOAD_ATTR and
LOAD_GLOBAL.
For this to work well we need https://bugs.python.org/issue44821, otherwise the
first assigned to an attribute of any object cannot be specialized.
--
messages
Mark Shannon added the comment:
Raymond,
When you say "this was mostly a net win" do you mean the more compact layout or
ordering?
The compact layout is obviously a win, and doesn't conflict with sharing. The
problem is that ordering conflicts with sharing.
As long as ins
New submission from Mark Shannon :
Currently, instance dictionaries (__dict__ attribute) are created lazily when
the first attribute is set.
This is bad for performance for a number of reasons:
1. It causes additional checks on every attribute access.
2. It causes allocation of the object and
Mark Shannon added the comment:
This isn't a bug. Although PEP 626 is not at all clear about this.
The key word in the PEP is "executed".
Because compound and multi-line constants are constants, the parts of them are
not "executed", but computed at compile time.
Hav
Change by Mark Shannon :
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pull_request: https://github.com/python/cpython/pull/27542
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Mark Shannon added the comment:
Pablo,
There is another failure on that buildbot: test_inspect fails with
^^
File "/home/mark/repos/cpython/Lib/inspect.py", line 1154, in walktree
classes.sort(key=attrgetter('__modul
Mark Shannon added the comment:
New changeset ddd1c418c05da0de978c75dfb3e4a5b8d27e1d9f by Irit Katriel in
branch 'main':
bpo-44725 : expose specialization stats in python (GH-27192)
https://github.com/python/cpython/commit/ddd1c418c05da0de978c75dfb3e4a5b8d27e1d9f
-
Mark Shannon added the comment:
New changeset e5c8ddb1714fb51ab1defa24352c98e0f01205dc by Serhiy Storchaka in
branch 'main':
bpo-44707: Fix an undefined behavior of the null pointer arithmetic (GH-27292)
https://github.com/python/cpython/commit/e5c8ddb1714fb51ab1defa24352c98
Change by Mark Shannon :
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Python tracker
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New submission from Mark Shannon :
class C:
def __init__(self, cond):
if cond:
self.a = 1
self.b = 2
c1 = C(True)
c2 = C(False)
In Python 3.5, the dictionary keys are shared
-
>>> sys.getsize
Mark Shannon added the comment:
New changeset ae0a2b756255629140efcbe57fc2e714f0267aa3 by Mark Shannon in
branch 'main':
bpo-44590: Lazily allocate frame objects (GH-27077)
https://github.com/python/cpython/commit/ae0a2b756255629140efcbe57fc2e7
Mark Shannon added the comment:
Not quite trivial, but simple enough :)
--
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___
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Change by Mark Shannon :
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pull_requests: +25800
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pull_request: https://github.com/python/cpython/pull/27255
___
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Mark Shannon added the comment:
We can fix this for 3.9. The fix to 3.10 was trivial and should port easily.
--
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Mark Shannon added the comment:
I say no, for a couple of reasons.
1. PEP 626 only applies to 3.10 onwards
2. The bytecode optimizer in 3.9 doesn't understand line numbers.
Changing it would be a lot of effort and likely to introduce more bugs than it
fixes.
Ultimately it is Łuk
Mark Shannon added the comment:
New changeset 37bdd2221ce3607a81d5d7fafc4603d95ca3e8cb by Miss Islington (bot)
in branch '3.10':
bpo-44645: Check for interrupts on any potentially backwards edge (GH-27216)
(GH-27235)
https://github.com/python/cpyt
Mark Shannon added the comment:
New changeset d09c13417890427f829e3df297beb0e27133f8f4 by Mark Shannon in
branch 'main':
bpo-44645: Check for interrupts on any potentially backwards edge (GH-27216)
https://github.com/python/cpython/commit/d09c13417890427f829e3df297beb0
Change by Mark Shannon :
--
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Mark Shannon added the comment:
Can we at least include the fix, until we can come up with a better test?
That test fails on 3.9 as well as 3.10 and main.
With a 3.9 build and the test in #27194:
./python -m test test_threading -R :
0:00:00 load avg: 0.95 Run tests sequentially
0:00:00 load
Change by Mark Shannon :
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pull_request: https://github.com/python/cpython/pull/27183
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Mark Shannon added the comment:
New changeset 000e70ad5246732fcbd27cf59268185cbd5ad734 by Mark Shannon in
branch 'main':
bpo-44645: Check for interrupts on any potentially backwards edge. (GH-27167)
https://github.com/python/cpython/commit/000e70ad5246732fcbd27cf5926818
Change by Mark Shannon :
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pull_request: https://github.com/python/cpython/pull/27182
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Change by Mark Shannon :
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pull_requests: +25703
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/27167
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Mark Shannon added the comment:
https://github.com/python/cpython/pull/18334 assumes that since all loops will
contain a backwards edge, checking for interrupts on JUMP_ABSOLUTE should be
sufficient.
However, https://github.com/python/cpython/pull/23743 changed the back edges in
while
Change by Mark Shannon :
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Mark Shannon added the comment:
New changeset f333ab0f2edec26a769ed558263ac662e5475451 by Mark Shannon in
branch 'main':
bpo-44622: Set line number of END_ASYNC_FOR to match that of iterator.
(GH-27160)
https://github.com/python/cpython/commit/f333ab0f2edec26a769ed558263ac6
Mark Shannon added the comment:
New changeset 641345d636320a6fca04a5271fa4c4c5ba3e5437 by Irit Katriel in
branch 'main':
bpo-26280: Port BINARY_SUBSCR to PEP 659 adaptive interpreter (GH-27043)
https://github.com/python/cpython/commit/641345d636320a6fca04a5271fa4c4
Change by Mark Shannon :
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pull_request: https://github.com/python/cpython/pull/27160
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Change by Mark Shannon :
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Change by Mark Shannon :
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pull_requests: +25680
stage: -> patch review
pull_request: https://github.com/python/cpython/pull/27138
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Mark Shannon added the comment:
New changeset 794ff7d505f852dc4e0f94901dc7387afaead3bb by Mark Shannon in
branch '3.10':
bpo-44616: Mark all clean up instructions at end of named exception block as
artificial (GH-27109) (GH-27135)
https://github.com/python/cpyt
Change by Mark Shannon :
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pull_request: https://github.com/python/cpython/pull/27135
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Mark Shannon added the comment:
New changeset e5862f79c16e28f1ec51d179698739a9b2d8c1d2 by Mark Shannon in
branch 'main':
bpo-44616: Mark all clean up instructions at end of named exception block as
artificial (GH-27109)
https://github.com/python/cpyt
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Change by Mark Shannon :
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pull_requests: +25655
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pull_request: https://github.com/python/cpython/pull/27109
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Change by Mark Shannon :
--
keywords: +patch
nosy: +Mark.Shannon
nosy_count: 1.0 -> 2.0
pull_requests: +25654
stage: -> patch review
pull_request: https://github.com/python/cpython/pull/27109
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Change by Mark Shannon :
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Mark Shannon added the comment:
Thanks Ned, you're doing a fantastic job of finding these issues.
Sorry for keeping you so busy with this.
This one was a latent bug, exposed by fixing https://bugs.python.org/issue44570.
--
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Mark Shannon added the comment:
New changeset 9487a17e3c7cbb3f11c144775cd108601701bb74 by Mark Shannon in
branch 'main':
bpo-44207: Add an internal version number to function objects. (GH-27078)
https://github.com/python/cpython/commit/9487a17e3c7cbb3f11c144775cd108
Change by Mark Shannon :
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pull_requests: +25628
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pull_request: https://github.com/python/cpython/pull/27078
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Change by Mark Shannon :
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pull_requests: +25626
stage: -> patch review
pull_request: https://github.com/python/cpython/pull/27077
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New submission from Mark Shannon :
In https://bugs.python.org/issue44032 we moved most of the data in the frame
stack, that is the locals, stack, and "specials" (globals, builtins, code etc),
from the heap allocated stack to a (mostly) contiguous array in memory.
That offered som
Change by Mark Shannon :
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pull_request: https://github.com/python/cpython/pull/27068
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pull_request: https://github.com/python/cpython/pull/27067
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Change by Mark Shannon :
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pull_requests: +25619
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pull_request: https://github.com/python/cpython/pull/27066
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Mark Shannon added the comment:
New changeset 514f76bbac386c320a9f3a70797241c612544391 by Mark Shannon in
branch 'main':
bpo-44581: Don't execute quickened instructions if tracing is on (GH-27064)
https://github.com/python/cpython/commit/514f76bbac386c320a9f3a707
Change by Mark Shannon :
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pull_requests: +25617
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pull_request: https://github.com/python/cpython/pull/27064
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Change by Mark Shannon :
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Mark Shannon added the comment:
This is a tricky one.
Which is the "correct" line appears to be subjective.
I'm inclined to leave it as is, as the tracing sequence seems better in the
case of method chaining.
See https://github.com/python/cpython/blob/main/Lib/test/test_
New submission from Mark Shannon :
This breaks a key invariant of PEP 659.
Inserting `assert(cframe.use_tracing == 0);` at the top of all quickened
instructions results in several failures when running the test suite.
--
assignee: Mark.Shannon
components: Interpreter Core
messages
Mark Shannon added the comment:
I suspect that the 0.1% increase is noise.
The size of importlib.h etc show a small decrease, suggesting that the
information content of the code object has *decreased*.
After all, the qualname has to stored somewhere and moving it from caller to
callee
Mark Shannon added the comment:
New changeset 1b28187a0e3e914ee48de8032cbba0a965dd5563 by Batuhan Taskaya in
branch 'main':
bpo-44313: generate LOAD_ATTR/CALL_FUNCTION for top-level imported objects
(GH-26677)
https://github.com/python/cpython/commit/1b28187a0e3e914ee48de8032cbba0
Mark Shannon added the comment:
I think this is a worthwhile improvement.
A few comments on this issue and your PR.
1. We already have qualified names on functions and generators and those can be
modified by @decorators.
In those cases, the code object and the function would disagree.
Code
Mark Shannon added the comment:
Can someone with fedora reproduce this failure?
--
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Mark Shannon added the comment:
I cannot reproduce this on ubuntu
Ubuntu 20.04.2 LTS
gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0
I've tried these configs:
./configure --with-pydebug
./configure
./configure --enable-optimizations
./configure --enable-optimizations --with-lto
I also
Mark Shannon added the comment:
And today's price for uninformative error message goes to...
"AssertionError: 'False' != 'True'"
;)
I'm looking into it.
--
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Python t
Mark Shannon added the comment:
> So, it's expected that `some_module` and `v` would be in the locals at this
> point.
If a function does not have the local variables `some_module` and `v`, then the
change wouldn't be visible to the debugee.
So what differe
Change by Mark Shannon :
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New submission from Mark Shannon :
We are making lots of changes to the code object.
We should clearly document all the changes in one place and explain the new
design well before 3.11 beta.
--
assignee: docs@python
components: Documentation
messages: 396432
nosy: Mark.Shannon, docs
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Mark Shannon added the comment:
Thanks for the reproducer.
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