# HG changeset patch # User Gregory Szorc <gregory.sz...@gmail.com> # Date 1520885700 25200 # Mon Mar 12 13:15:00 2018 -0700 # Branch stable # Node ID 46905416a5f47e9e46aa2db0e2e4f45e7414c979 # Parent 9639c433be54191b4136b48fe70fc8344d2b5db2 hgweb: garbage collect on every request
There appears to be a cycle in localrepository or hgweb that is preventing repositories from being garbage collected when hgwebdir dispatches to hgweb. Every request creates a new repository instance and then leaks that object and other referenced objects. A periodic GC to find cycles will eventually collect the old repositories. But these don't run reliably and rapid requests to hgwebdir can result in rapidly increasing memory consumption. With the Firefox repository, repeated requests to raw-file URLs leak ~100 MB per hgwebdir request (most of this appears to be cached manifest data structures). WSGI processes quickly grow to >1 GB RSS. Breaking the cycles in localrepository is going to be a bit of work. Because we know that hgwebdir leaks localrepository instances, let's put a band aid on the problem in the form of an explicit gc.collect() on every hgwebdir request. As the inline comment states, ideally we'd do this in a finally block for the current request iff it dispatches to hgweb. But _runwsgi() returns an explicit value. We need the finally to run after generator exhaustion. So we'd need to refactor _runwsgi() to "yield" instead of "return." That's too much change for a patch to stable. So we implement this hack one function above and run it on every request. The performance impact of this change should be minimal. Any impact should be offset by benefits from not having hgwebdir processes leak memory. diff --git a/mercurial/hgweb/hgwebdir_mod.py b/mercurial/hgweb/hgwebdir_mod.py --- a/mercurial/hgweb/hgwebdir_mod.py +++ b/mercurial/hgweb/hgwebdir_mod.py @@ -8,6 +8,7 @@ from __future__ import absolute_import +import gc import os import re import time @@ -224,8 +225,18 @@ class hgwebdir(object): def run_wsgi(self, req): profile = self.ui.configbool('profiling', 'enabled') with profiling.profile(self.ui, enabled=profile): - for r in self._runwsgi(req): - yield r + try: + for r in self._runwsgi(req): + yield r + finally: + # There are known cycles in localrepository that prevent + # those objects (and tons of held references) from being + # collected through normal refcounting. We mitigate those + # leaks by performing an explicit GC on every request. + # TODO remove this once leaks are fixed. + # TODO only run this on requests that create localrepository + # instances instead of every request. + gc.collect() def _runwsgi(self, req): try: _______________________________________________ Mercurial-devel mailing list Mercurial-devel@mercurial-scm.org https://www.mercurial-scm.org/mailman/listinfo/mercurial-devel