[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:


New changeset ae9de82e321581e1906c6ef2a7ad83ab30ae3325 by Brandt Bucher in 
branch 'main':
bpo-46841: Use a `bytes` object for `_co_code_adaptive` (GH-32205)
https://github.com/python/cpython/commit/ae9de82e321581e1906c6ef2a7ad83ab30ae3325


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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:


New changeset bd2e47c8830d1b2869f2b4345945a5e0c3b4e3fb by Brandt Bucher in 
branch 'main':
bpo-46841: Avoid unnecessary allocations in code object comparisons (GH-3)
https://github.com/python/cpython/commit/bd2e47c8830d1b2869f2b4345945a5e0c3b4e3fb


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[issue46841] Inline bytecode caches

[Dong-hee Na]

Change by Dong-hee Na :


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[issue46841] Inline bytecode caches

[Brandt Bucher]

Change by Brandt Bucher :


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pull_request: https://github.com/python/cpython/pull/3

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[issue46841] Inline bytecode caches

[Brandt Bucher]

Change by Brandt Bucher :


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pull_request: https://github.com/python/cpython/pull/32205

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[issue46841] Inline bytecode caches

[Irit Katriel]

Irit Katriel  added the comment:


New changeset 2f49b97cc5426087b46515254b9a97a22ee8c807 by Irit Katriel in 
branch 'main':
bpo-46841: remove no-longer-used macro UPDATE_PREV_INSTR_OPARG (GH-32100)
https://github.com/python/cpython/commit/2f49b97cc5426087b46515254b9a97a22ee8c807


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[issue46841] Inline bytecode caches

[Irit Katriel]

Change by Irit Katriel :


--
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nosy_count: 5.0 -> 6.0
pull_requests: +30182
pull_request: https://github.com/python/cpython/pull/32100

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[issue46841] Inline bytecode caches

[penguin_wwy]

Change by penguin_wwy <940375...@qq.com>:


--
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nosy_count: 4.0 -> 5.0
pull_requests: +30181
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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:


New changeset 2bde6827ea4f136297b2d882480b981ff26262b6 by Brandt Bucher in 
branch 'main':
bpo-46841: Quicken code in-place (GH-31888)
https://github.com/python/cpython/commit/2bde6827ea4f136297b2d882480b981ff26262b6


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[issue46841] Inline bytecode caches

[Brandt Bucher]

Change by Brandt Bucher :


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pull_request: https://github.com/python/cpython/pull/31968

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[issue46841] Inline bytecode caches

[Brandt Bucher]

Brandt Bucher  added the comment:


New changeset 49e1e1e1bd59cac1855b1ef4dec05d649ebcd81a by Mark Shannon in 
branch 'main':
bpo-46841: Don't scan backwards in bytecode (GH-31901)
https://github.com/python/cpython/commit/49e1e1e1bd59cac1855b1ef4dec05d649ebcd81a


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[issue46841] Inline bytecode caches

[Mark Shannon]

Change by Mark Shannon :


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pull_request: https://github.com/python/cpython/pull/31901

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[issue46841] Inline bytecode caches

[Brandt Bucher]

Change by Brandt Bucher :


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pull_request: https://github.com/python/cpython/pull/31888

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[issue46841] Inline bytecode caches

[Brandt Bucher]

Brandt Bucher  added the comment:


New changeset a89c29fbcc7e7e85848499443d819c3fab68c78a by Brandt Bucher in 
branch 'main':
bpo-46841: Add a _Py_SET_OPCODE macro (GH-31780)
https://github.com/python/cpython/commit/a89c29fbcc7e7e85848499443d819c3fab68c78a


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[issue46841] Inline bytecode caches

[Mark Shannon]

Change by Mark Shannon :


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[issue46841] Inline bytecode caches

[Brandt Bucher]

Change by Brandt Bucher :


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pull_request: https://github.com/python/cpython/pull/31780

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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:


New changeset 5498a61c7c25db6f9e76032aa9c5153d79e09889 by Brandt Bucher in 
branch 'main':
bpo-46841: Don't use an oparg counter for `STORE_SUBSCR` (GH-31742)
https://github.com/python/cpython/commit/5498a61c7c25db6f9e76032aa9c5153d79e09889


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[issue46841] Inline bytecode caches

[Brandt Bucher]

Change by Brandt Bucher :


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pull_request: https://github.com/python/cpython/pull/31742

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[issue46841] Inline bytecode caches

[Brandt Bucher]

Brandt Bucher  added the comment:


New changeset f193631387bfee99a812e39b05d5b7e6384b57f5 by Brandt Bucher in 
branch 'main':
bpo-46841: Use inline caching for calls (GH-31709)
https://github.com/python/cpython/commit/f193631387bfee99a812e39b05d5b7e6384b57f5


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[issue46841] Inline bytecode caches

[Brandt Bucher]

Change by Brandt Bucher :


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pull_request: https://github.com/python/cpython/pull/31709

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[issue46841] Inline bytecode caches

[Brandt Bucher]

Brandt Bucher  added the comment:


New changeset c4d2d57eefb1224a12e2e95e4508658dfbf6a7c9 by Brandt Bucher in 
branch 'main':
bpo-46841: Fix BINARY_OP's handling of inline caches (GH-31671)
https://github.com/python/cpython/commit/c4d2d57eefb1224a12e2e95e4508658dfbf6a7c9


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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:


New changeset 586b24d3be1aec5d2568b070a249b4d75e608782 by Brandt Bucher in 
branch 'main':
bpo-46841: Fix error message hacks in `GET_AWAITABLE` (GH-31664)
https://github.com/python/cpython/commit/586b24d3be1aec5d2568b070a249b4d75e608782


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[issue46841] Inline bytecode caches

[Brandt Bucher]

Brandt Bucher  added the comment:


New changeset 05a8bc1c944709e7468f157bd1b6032f368e43bf by Brandt Bucher in 
branch 'main':
bpo-46841: Use inline caching for attribute accesses (GH-31640)
https://github.com/python/cpython/commit/05a8bc1c944709e7468f157bd1b6032f368e43bf


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[issue46841] Inline bytecode caches

[Brandt Bucher]

Change by Brandt Bucher :


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pull_request: https://github.com/python/cpython/pull/31671

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[issue46841] Inline bytecode caches

[Brandt Bucher]

Change by Brandt Bucher :


--
pull_requests: +29783
pull_request: https://github.com/python/cpython/pull/31664

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[issue46841] Inline bytecode caches

[Brandt Bucher]

Brandt Bucher  added the comment:


New changeset 127797f572cc7374192e415c44ea2e95b009d5ab by Brandt Bucher in 
branch 'main':
bpo-46841: Improve the failure stats for COMPARE_OP (GH-31663)
https://github.com/python/cpython/commit/127797f572cc7374192e415c44ea2e95b009d5ab


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[issue46841] Inline bytecode caches

[Brandt Bucher]

Change by Brandt Bucher :


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pull_request: https://github.com/python/cpython/pull/31663

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[issue46841] Inline bytecode caches

[Brandt Bucher]

Brandt Bucher  added the comment:

> What I *think* is happening is that the inline cache takes the size of the 
> function (in code units) from about 4800 to about 5200, crossing our 
> threshold for quickening (currently set to 5000).

Yep, nailed it:

>>> len(list(dis.get_instructions(do_unpacking)))
4827
>>> len(list(dis.get_instructions(do_unpacking, show_caches=True)))
5251
>>> do_unpacking(1_000, range(10))
0.06478393300494645
>>> do_unpacking.__code__._co_quickened is None
True

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[issue46841] Inline bytecode caches

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

> OOI, does it become a "blocker" again once you've done the alpha release, or 
> what stops it being deferred past the beta or even the final release?

Check out the devguide:

https://devguide.python.org/triaging/#priority

> The issue will not hold up the next release, n. It will be promoted to a 
> release blocker for the following release, n+1.

But in any case, I normally promote them to release blockers by hand and all of 
them become full blockers in the beta.

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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:

It's not an UNPACK_SEQUENCE slowdown, it's a silly benchmark ;)

https://github.com/python/pyperformance/blob/main/pyperformance/data-files/benchmarks/bm_unpack_sequence/run_benchmark.py#L6

What I *think* is happening is that the inline cache takes the size of the 
function (in code units) from about 4800 to about 5200, crossing our threshold 
for quickening (currently set to 5000).

When we quicken in-place, there will be no need for a threshold and this issue 
will disappear. We should probably up the threshold for now, just to keep the 
charts looking good.

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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:

Good to know, although "deferred blocker" is somewhat vague about when it is 
deferred until.

OOI, does it become a "blocker" again once you've done the alpha release, or 
what stops it being deferred past the beta or even the final release?

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[issue46841] Inline bytecode caches

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

> Is there some way to mark something as not blocking an alpha release, but 
> blocking a beta release?

"Deferred blocker"

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[issue46841] Inline bytecode caches

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


--
priority: release blocker -> deferred blocker

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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:

We should be done with this by early next week, if you can wait.

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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:

Is there some way to mark something as not blocking an alpha release, but 
blocking a beta release?

Everything is working at the moment, but not so efficiently.

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[issue46841] Inline bytecode caches

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

This is marked as a release blocker so I am holding the alpha release on this. 
Is there anything we can do to unblock this issue?

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[issue46841] Inline bytecode caches

[neonene]

neonene  added the comment:

UNPACK_SEQUENCE's slowdown is already filed?

https://speed.python.org/timeline/#/?exe=12=unpack_sequence=4=50=off=on=on

I hit the gap at 424ecab on Windows.

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[issue46841] Inline bytecode caches

[Brandt Bucher]

Change by Brandt Bucher :


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pull_requests: +29761
pull_request: https://github.com/python/cpython/pull/31640

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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:


New changeset 3b0f1c5a710eff289dc44bec972dbaea353cc54f by Mark Shannon in 
branch 'main':
bpo-46841: Use inline cache for `BINARY_SUBSCR`. (GH-31618)
https://github.com/python/cpython/commit/3b0f1c5a710eff289dc44bec972dbaea353cc54f


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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:


New changeset 7820a5897e7762df23bff1cbe749652130654a08 by Brandt Bucher in 
branch 'main':
bpo-46841: Use inline caching for `COMPARE_OP` (GH-31622)
https://github.com/python/cpython/commit/7820a5897e7762df23bff1cbe749652130654a08


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[issue46841] Inline bytecode caches

[Brandt Bucher]

Change by Brandt Bucher :


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pull_requests: +29747
pull_request: https://github.com/python/cpython/pull/31622

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[issue46841] Inline bytecode caches

[Mark Shannon]

Change by Mark Shannon :


--
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pull_request: https://github.com/python/cpython/pull/31618

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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:


New changeset 4558af5a8f8e56a9b0dc11f6e834c47e0fd05f9e by Mark Shannon in 
branch 'main':
bpo-46841: Move the cache for `LOAD_GLOBAL` inline. (GH-31575)
https://github.com/python/cpython/commit/4558af5a8f8e56a9b0dc11f6e834c47e0fd05f9e


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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:


New changeset 424ecab494d538650ba34937cdd710094ccb2275 by Brandt Bucher in 
branch 'main':
bpo-46841: Use inline caching for `UNPACK_SEQUENCE` (GH-31591)
https://github.com/python/cpython/commit/424ecab494d538650ba34937cdd710094ccb2275


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[issue46841] Inline bytecode caches

[Brandt Bucher]

Change by Brandt Bucher :


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pull_request: https://github.com/python/cpython/pull/31591

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[issue46841] Inline bytecode caches

[Mark Shannon]

Change by Mark Shannon :


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pull_request: https://github.com/python/cpython/pull/31575

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[issue46841] Inline bytecode caches

[Mark Shannon]

Change by Mark Shannon :


--
priority: normal -> release blocker

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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:

Making this a release blocker, as we really cannot leave this half finished for 
the release.

Shouldn't be a problem, as we'll have it done in a week or so.

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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:


New changeset 0f41aac109c45aa468c432f798947c54d4178b3d by Brandt Bucher in 
branch 'main':
bpo-46841: Use *inline* caching for `BINARY_OP` (GH-31543)
https://github.com/python/cpython/commit/0f41aac109c45aa468c432f798947c54d4178b3d


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[issue46841] Inline bytecode caches

[Mark Shannon]

Change by Mark Shannon :


--
pull_requests: +29673
pull_request: https://github.com/python/cpython/pull/31552

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[issue46841] Inline bytecode caches

[Mark Shannon]

Mark Shannon  added the comment:

We need to decide what to do about dis.

I don't think we should have a `show_cache` option, as the caches are 
meaningless junk without quickening (maybe we should drop the CACHE opcode, and 
just use zeroes).

Instead we should have a `show_quickened` option, to show the quickened form, 
which we need to make clear is very much implementation defined.
E.g. Cinder might show the machine code as well.

That way, we can present the cache information as extra data on the quickened 
form, rather than junk instructions.

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[issue46841] Inline bytecode caches

[Brandt Bucher]

Change by Brandt Bucher :


--
keywords: +patch
pull_requests: +29666
pull_request: https://github.com/python/cpython/pull/31543

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[issue46841] Inline bytecode caches

[Brandt Bucher]

New submission from Brandt Bucher :

...as discussed in https://github.com/faster-cpython/ideas/discussions/263.

My plan is for this initial PR to lay the groundwork, then to work on porting 
over the existing opcode caches one-by-one. Once that's done, we can clean up 
lots of the "old" machinery.

--
assignee: brandtbucher
components: Interpreter Core
messages: 413875
nosy: Mark.Shannon, brandtbucher
priority: normal
severity: normal
stage: patch review
status: open
title: Inline bytecode caches
type: performance
versions: Python 3.11

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