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Re: svn commit: r1033228 - in /subversion/branches/1.6.x: ./ CHANGES STATUS subversion/svnserve/main.c subversion/tests/cmdline/merge_tests.py

From: Stefan Fuhrmann <eqfox_at_web.de>
Date: Mon, 27 Dec 2010 19:29:47 +0100

On 27.12.2010 19:16, Blair Zajac wrote:
> On 12/27/10 7:45 AM, Daniel Shahaf wrote:
>> Ping...
>>
>> Blair Zajac wrote on Tue, Nov 09, 2010 at 20:05:13 -0800:
>>>
>>> On Nov 9, 2010, at 1:03 PM, hwright_at_apache.org wrote:
>>>
>>>> Author: hwright
>>>> Date: Tue Nov 9 21:03:16 2010
>>>> New Revision: 1033228
>>>>
>>>> URL: http://svn.apache.org/viewvc?rev=1033228&view=rev
>>>> Log:
>>>> Merge r1022675 from trunk:
>>>>
>>>> * r1022675 (r982355 from ^subversion/branches/performance)
>>>> Limit the amount of unused memory fragments held by the root pools.
>>>> Justification:
>>>> In combination with blame -g server side memory leaks, see
>>>> r1032808 and
>>>> http://svn.haxx.se/dev/archive-2010-11/0102.shtml, svnserve's
>>>> memory
>>>> usage can get bloated and stay that way, see
>>>> see http://svn.haxx.se/dev/archive-2010-11/0165.shtml.
>>>> Notes:
>>>> Use --accept=mine-full to avoid bizzare branch root property
>>>> conflicts
>>>> on 'svn:ignore' and 'bugtraq:logregex'. This happens for me
>>>> with both
>>>> 1.6.14 and trunk_at_1032984.
>>>> Votes:
>>>> +1: pburba, cmpilato, hwright
>>>>
>>>
>>>>
>>>> --- subversion/branches/1.6.x/subversion/svnserve/main.c (original)
>>>> +++ subversion/branches/1.6.x/subversion/svnserve/main.c Tue Nov 9
>>>> 21:03:16 2010
>>>> @@ -356,6 +356,7 @@ int main(int argc, const char *argv[])
>>>> apr_sockaddr_t *sa;
>>>> apr_pool_t *pool;
>>>> apr_pool_t *connection_pool;
>>>> + apr_allocator_t *allocator;
>>>> svn_error_t *err;
>>>> apr_getopt_t *os;
>>>> int opt;
>>>> @@ -747,10 +748,22 @@ int main(int argc, const char *argv[])
>>>> return ERROR_SUCCESS;
>>>> #endif
>>>>
>>>> + /* If we are using fulltext caches etc., we will allocate
>>>> many large
>>>> + chunks of memory of various sizes outside the cachde for
>>>> those
>>>> + fulltexts. Make sure, we use the memory wisely: use an
>>>> allocator
>>>> + that causes memory fragments to be given back to the OS
>>>> early. */
>>>> +
>>>> + if (apr_allocator_create(&allocator))
>>>> + return EXIT_FAILURE;
>>>> +
>>>> + apr_allocator_max_free_set(allocator,
>>>> SVN_ALLOCATOR_RECOMMENDED_MAX_FREE);
>>>> +
>>>> /* Non-standard pool handling. The main thread never blocks
>>>> to join
>>>> the connection threads so it cannot clean up after each
>>>> one. So
>>>> separate pools, that can be cleared at thread exit, are
>>>> used */
>>>> - connection_pool = svn_pool_create(NULL);
>>>> +
>>>> + connection_pool = svn_pool_create_ex(NULL, allocator);
>>>> + apr_allocator_owner_set(allocator, connection_pool);
>>>
>>>
>>> Shouldn't the allocator have a mutex registered with it, given that
>>> svnserve is multithreaded?
>
> We had a chat on IRC and it looks like the code is fine. I'd have to
> dig through IRC logs to fine the conversation.
>
> Blair
>
Every thread creates its own allocator and root pool object
(as indicated by the comment). Both are then only accessed
by the same thread that created them.

-- Stefan^2.
Received on 2010-12-27 19:43:57 CET

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