René's URL Explorer Experiment


Title: gh-144319: obtain SeLockMemoryPrivilege on Windows by chris-eibl · Pull Request #144928 · python/cpython · GitHub

Open Graph Title: gh-144319: obtain SeLockMemoryPrivilege on Windows by chris-eibl · Pull Request #144928 · python/cpython

X Title: gh-144319: obtain SeLockMemoryPrivilege on Windows by chris-eibl · Pull Request #144928 · python/cpython

Description: Obtain SeLockMemoryPrivilege on startup on Windows to be able to use large pages when requested by setting the environment variable PYTHON_PYMALLOC_HUGEPAGES. I've decided to fail if that doesn't succeed instead of silently switching to normal 4K pages and updated the documentation. Using bench_obmalloc.py from the issue I get Benchmark Default Hugepages Change arena_pressure 0.717s 0.477 -33.5% mixed_sizes 0.213s 0.156 -27.0% list_of_tuples 2.417s 1.876 -22.4% class_instances 0.224s 0.180 -19.6% fragmentation 0.250s 0.204 -18.1% bulk_small_alloc 0.324s 0.266 -18.0% random_walk 1.364s 1.161 -14.8% dict_churn 0.123s 0.122 -1.1% for an AMD64 VS2026 release build (no PGO) on my PC (Haswell i5-4570, Windows 10). Issue: gh-144319 📚 Documentation preview 📚: https://cpython-previews--144928.org.readthedocs.build/

Open Graph Description: Obtain SeLockMemoryPrivilege on startup on Windows to be able to use large pages when requested by setting the environment variable PYTHON_PYMALLOC_HUGEPAGES. I've decided to fail if that doesn...

X Description: Obtain SeLockMemoryPrivilege on startup on Windows to be able to use large pages when requested by setting the environment variable PYTHON_PYMALLOC_HUGEPAGES. I've decided to fail if that d...

Opengraph URL: https://github.com/python/cpython/pull/144928

X: @github

direct link

Domain: github.com

route-pattern/:user_id/:repository/pull/:id/files(.:format)
route-controllerpull_requests
route-actionfiles
fetch-noncev2:eb76a678-bb48-37b6-112f-be99a81f7e3b
current-catalog-service-hashae870bc5e265a340912cde392f23dad3671a0a881730ffdadd82f2f57d81641b
request-idB780:29383A:9D0567:D3FC4F:6A515C27
html-safe-noncea15a996c5434c0a784378f839594254e8cfa510b02d38a1d9d3a54cf6dbe997a
visitor-payloadeyJyZWZlcnJlciI6IiIsInJlcXVlc3RfaWQiOiJCNzgwOjI5MzgzQTo5RDA1Njc6RDNGQzRGOjZBNTE1QzI3IiwidmlzaXRvcl9pZCI6IjQ2OTEwOTA0ODY1MjEzMjI1MzUiLCJyZWdpb25fZWRnZSI6ImlhZCIsInJlZ2lvbl9yZW5kZXIiOiJpYWQifQ==
visitor-hmac12b2a37de09ab1cecbe030474d8298947633ad69af65df45c6c22b5af26c9c5f
hovercard-subject-tagpull_request:3295568757
github-keyboard-shortcutsrepository,pull-request-list,pull-request-conversation,pull-request-files-changed,copilot
google-site-verificationApib7-x98H0j5cPqHWwSMm6dNU4GmODRoqxLiDzdx9I
octolytics-urlhttps://collector.github.com/github/collect
analytics-location///pull_requests/show/files
fb:app_id1401488693436528
apple-itunes-appapp-id=1477376905, app-argument=https://github.com/python/cpython/pull/144928/files
twitter:imagehttps://avatars.githubusercontent.com/u/138194463?s=400&v=4
twitter:cardsummary_large_image
og:imagehttps://avatars.githubusercontent.com/u/138194463?s=400&v=4
og:image:altObtain SeLockMemoryPrivilege on startup on Windows to be able to use large pages when requested by setting the environment variable PYTHON_PYMALLOC_HUGEPAGES. I've decided to fail if that doesn...
og:site_nameGitHub
og:typeobject
hostnamegithub.com
expected-hostnamegithub.com
None6f17634ed2af1d116850bcea6c63a70a4d72970f33ade1dd3eef3764b7e16994
turbo-cache-controlno-preview
diff-viewunified
go-importgithub.com/python/cpython git https://github.com/python/cpython.git
octolytics-dimension-user_id1525981
octolytics-dimension-user_loginpython
octolytics-dimension-repository_id81598961
octolytics-dimension-repository_nwopython/cpython
octolytics-dimension-repository_publictrue
octolytics-dimension-repository_is_forkfalse
octolytics-dimension-repository_network_root_id81598961
octolytics-dimension-repository_network_root_nwopython/cpython
turbo-body-classeslogged-out env-production page-responsive full-width
disable-turbotrue
browser-stats-urlhttps://api.github.com/_private/browser/stats
browser-errors-urlhttps://api.github.com/_private/browser/errors
release2d32229a0a79708ee9a4f132f630b36d58b4495a
ui-targetfull
theme-color#1e2327
color-schemelight dark

Links:

Skip to contenthttps://github.com/python/cpython/pull/144928/files#start-of-content
https://github.com/
Sign in https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fpython%2Fcpython%2Fpull%2F144928%2Ffiles
GitHub CopilotWrite better code with AIhttps://github.com/features/copilot
GitHub Copilot appDirect agents from issue to mergehttps://github.com/features/ai/github-app
MCP RegistryNewIntegrate external toolshttps://github.com/mcp
ActionsAutomate any workflowhttps://github.com/features/actions
CodespacesInstant dev environmentshttps://github.com/features/codespaces
IssuesPlan and track workhttps://github.com/features/issues
Code ReviewManage code changeshttps://github.com/features/code-review
GitHub Advanced SecurityFind and fix vulnerabilitieshttps://github.com/security/advanced-security
Code securitySecure your code as you buildhttps://github.com/security/advanced-security/code-security
Secret protectionStop leaks before they starthttps://github.com/security/advanced-security/secret-protection
Why GitHubhttps://github.com/why-github
Documentationhttps://docs.github.com
Bloghttps://github.blog
Changeloghttps://github.blog/changelog
Marketplacehttps://github.com/marketplace
View all featureshttps://github.com/features
Enterpriseshttps://github.com/enterprise
Small and medium teamshttps://github.com/team
Startupshttps://github.com/enterprise/startups
Nonprofitshttps://github.com/solutions/industry/nonprofits
App Modernizationhttps://github.com/solutions/use-case/app-modernization
DevSecOpshttps://github.com/solutions/use-case/devsecops
DevOpshttps://github.com/solutions/use-case/devops
CI/CDhttps://github.com/solutions/use-case/ci-cd
View all use caseshttps://github.com/solutions/use-case
Healthcarehttps://github.com/solutions/industry/healthcare
Financial serviceshttps://github.com/solutions/industry/financial-services
Manufacturinghttps://github.com/solutions/industry/manufacturing
Governmenthttps://github.com/solutions/industry/government
View all industrieshttps://github.com/solutions/industry
View all solutionshttps://github.com/solutions
AIhttps://github.com/resources/articles?topic=ai
Software Developmenthttps://github.com/resources/articles?topic=software-development
DevOpshttps://github.com/resources/articles?topic=devops
Securityhttps://github.com/resources/articles?topic=security
View all topicshttps://github.com/resources/articles
Customer storieshttps://github.com/customer-stories
Events & webinarshttps://github.com/resources/events
Ebooks & reportshttps://github.com/resources/whitepapers
Business insightshttps://github.com/solutions/executive-insights
GitHub Skillshttps://skills.github.com
Documentationhttps://docs.github.com
Customer supporthttps://support.github.com
Community forumhttps://github.com/orgs/community/discussions
Trust centerhttps://github.com/trust-center
Partnershttps://github.com/partners
View all resourceshttps://github.com/resources
GitHub SponsorsFund open source developershttps://github.com/open-source/sponsors
Security Labhttps://securitylab.github.com
Maintainer Communityhttps://maintainers.github.com
Acceleratorhttps://github.com/open-source/accelerator
GitHub Starshttps://stars.github.com
Archive Programhttps://archiveprogram.github.com
Topicshttps://github.com/topics
Trendinghttps://github.com/trending
Collectionshttps://github.com/collections
Enterprise platformAI-powered developer platformhttps://github.com/enterprise
GitHub Advanced SecurityEnterprise-grade security featureshttps://github.com/security/advanced-security
Copilot for BusinessEnterprise-grade AI featureshttps://github.com/features/copilot/copilot-business
Premium SupportEnterprise-grade 24/7 supporthttps://github.com/enterprise/premium-support
Pricinghttps://github.com/pricing
Search syntax tipshttps://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax
documentationhttps://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax
Sign in https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fpython%2Fcpython%2Fpull%2F144928%2Ffiles
Sign up https://github.com/signup?ref_cta=Sign+up&ref_loc=header+logged+out&ref_page=%2F%3Cuser-name%3E%2F%3Crepo-name%3E%2Fpull_requests%2Fshow%2Ffiles&source=header-repo&source_repo=python%2Fcpython
Reloadhttps://github.com/python/cpython/pull/144928/files
Reloadhttps://github.com/python/cpython/pull/144928/files
Reloadhttps://github.com/python/cpython/pull/144928/files
Please reload this pagehttps://github.com/python/cpython/pull/144928/files
python https://github.com/python
cpythonhttps://github.com/python/cpython
Please reload this pagehttps://github.com/python/cpython/pull/144928/files
Notifications https://github.com/login?return_to=%2Fpython%2Fcpython
Fork 35k https://github.com/login?return_to=%2Fpython%2Fcpython
Star 73.7k https://github.com/login?return_to=%2Fpython%2Fcpython
Code https://github.com/python/cpython
Issues 5k+ https://github.com/python/cpython/issues
Pull requests 2.3k https://github.com/python/cpython/pulls
Actions https://github.com/python/cpython/actions
Projects https://github.com/python/cpython/projects
Security and quality 0 https://github.com/python/cpython/security
Insights https://github.com/python/cpython/pulse
Code https://github.com/python/cpython
Issues https://github.com/python/cpython/issues
Pull requests https://github.com/python/cpython/pulls
Actions https://github.com/python/cpython/actions
Projects https://github.com/python/cpython/projects
Security and quality https://github.com/python/cpython/security
Insights https://github.com/python/cpython/pulse
Sign up for GitHub https://github.com/signup?return_to=%2Fpython%2Fcpython%2Fissues%2Fnew%2Fchoose
terms of servicehttps://docs.github.com/terms
privacy statementhttps://docs.github.com/privacy
Sign inhttps://github.com/login?return_to=%2Fpython%2Fcpython%2Fissues%2Fnew%2Fchoose
pablogsalhttps://github.com/pablogsal
python:mainhttps://github.com/python/cpython/tree/main
chris-eibl:huge_pages_windowshttps://github.com/chris-eibl/cpython/tree/huge_pages_windows
Conversation 7 https://github.com/python/cpython/pull/144928
Commits 3 https://github.com/python/cpython/pull/144928/commits
Checks 49 https://github.com/python/cpython/pull/144928/checks
Files changed 3 https://github.com/python/cpython/pull/144928/files
gh-144319: obtain SeLockMemoryPrivilege on Windows https://github.com/python/cpython/pull/144928/files#top
Show all changes 3 commits https://github.com/python/cpython/pull/144928/files
3fa1785 obtain SeLockMemoryPrivilege on startup so that huge pages chris-eibl Feb 17, 2026 https://github.com/python/cpython/pull/144928/commits/3fa1785597d424a5faef048db1911c5c9ae61ecc
108703c Merge remote-tracking branch 'upstream/main' into huge_pages_windows chris-eibl Mar 23, 2026 https://github.com/python/cpython/pull/144928/commits/108703ca7736f7f4735ab64033d86d9977bbfd60
725fd83 fail with better error message if the SeLockMemoryPrivilege chris-eibl Mar 23, 2026 https://github.com/python/cpython/pull/144928/commits/725fd835300a99b24e63daa0e7102fdbe612cbce
Clear filters https://github.com/python/cpython/pull/144928/files
Please reload this pagehttps://github.com/python/cpython/pull/144928/files
Please reload this pagehttps://github.com/python/cpython/pull/144928/files
cmdline.rst https://github.com/python/cpython/pull/144928/files#diff-5f4de3bbf22aa3cc7412333ded7d7729ae0ac23703551daecac350869768b4ef
configure.rst https://github.com/python/cpython/pull/144928/files#diff-3d679da2b3a01e3744dc65d731bb0a896c07e60f3cfdb19911afab3c146a80ef
pylifecycle.c https://github.com/python/cpython/pull/144928/files#diff-69223f5bb01f359a23246afbbf75b45c622e719424418d658674fbb6c2b36fad
Doc/using/cmdline.rsthttps://github.com/python/cpython/pull/144928/files#diff-5f4de3bbf22aa3cc7412333ded7d7729ae0ac23703551daecac350869768b4ef
View file https://github.com/chris-eibl/cpython/blob/725fd835300a99b24e63daa0e7102fdbe612cbce/Doc/using/cmdline.rst
Open in desktop https://desktop.github.com
https://github.co/hiddenchars
https://github.com/python/cpython/pull/144928/{{ revealButtonHref }}
https://github.com/python/cpython/pull/144928/files#diff-5f4de3bbf22aa3cc7412333ded7d7729ae0ac23703551daecac350869768b4ef
https://github.com/python/cpython/pull/144928/files#diff-5f4de3bbf22aa3cc7412333ded7d7729ae0ac23703551daecac350869768b4ef
https://github.com/python/cpython/blob/main/.github/CODEOWNERS#L84
Doc/using/configure.rsthttps://github.com/python/cpython/pull/144928/files#diff-3d679da2b3a01e3744dc65d731bb0a896c07e60f3cfdb19911afab3c146a80ef
View file https://github.com/chris-eibl/cpython/blob/725fd835300a99b24e63daa0e7102fdbe612cbce/Doc/using/configure.rst
Open in desktop https://desktop.github.com
https://github.co/hiddenchars
https://github.com/python/cpython/pull/144928/{{ revealButtonHref }}
https://github.com/python/cpython/pull/144928/files#diff-3d679da2b3a01e3744dc65d731bb0a896c07e60f3cfdb19911afab3c146a80ef
https://github.com/python/cpython/pull/144928/files#diff-3d679da2b3a01e3744dc65d731bb0a896c07e60f3cfdb19911afab3c146a80ef
https://github.com/python/cpython/blob/main/.github/CODEOWNERS#L320
Python/pylifecycle.chttps://github.com/python/cpython/pull/144928/files#diff-69223f5bb01f359a23246afbbf75b45c622e719424418d658674fbb6c2b36fad
View file https://github.com/chris-eibl/cpython/blob/725fd835300a99b24e63daa0e7102fdbe612cbce/Python/pylifecycle.c
Open in desktop https://desktop.github.com
https://github.co/hiddenchars
https://github.com/python/cpython/pull/144928/{{ revealButtonHref }}
https://github.com/python/cpython/pull/144928/files#diff-69223f5bb01f359a23246afbbf75b45c622e719424418d658674fbb6c2b36fad
https://github.com/python/cpython/pull/144928/files#diff-69223f5bb01f359a23246afbbf75b45c622e719424418d658674fbb6c2b36fad
https://github.com/python/cpython/pull/144928/files#diff-69223f5bb01f359a23246afbbf75b45c622e719424418d658674fbb6c2b36fad
pablogsalhttps://github.com/pablogsal
Mar 23, 2026https://github.com/python/cpython/pull/144928/files#r2977901147
Learn morehttps://docs.github.com/articles/managing-disruptive-comments/#hiding-a-comment
Please reload this pagehttps://github.com/python/cpython/pull/144928/files
https://github.com/python/cpython/pull/144928/files#diff-69223f5bb01f359a23246afbbf75b45c622e719424418d658674fbb6c2b36fad
https://github.com/python/cpython/pull/144928/files#diff-69223f5bb01f359a23246afbbf75b45c622e719424418d658674fbb6c2b36fad
Please reload this pagehttps://github.com/python/cpython/pull/144928/files
https://github.com
Termshttps://docs.github.com/site-policy/github-terms/github-terms-of-service
Privacyhttps://docs.github.com/site-policy/privacy-policies/github-privacy-statement
Securityhttps://github.com/security
Statushttps://www.githubstatus.com/
Communityhttps://github.community/
Docshttps://docs.github.com/
Contacthttps://support.github.com?tags=dotcom-footer

Viewport: width=device-width

URLs of crawlers that visited me.