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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HTTPCORE-390) Lock-less connection pools
Date Sun, 20 Aug 2017 14:26:00 GMT

    [ https://issues.apache.org/jira/browse/HTTPCORE-390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16134441#comment-16134441
] 

ASF subversion and git services commented on HTTPCORE-390:
----------------------------------------------------------

Commit 41d642f1ad9dd6e826708ef38095b5b3a6300753 in httpcomponents-core's branch refs/heads/master
from [~olegk]
[ https://git-wip-us.apache.org/repos/asf?p=httpcomponents-core.git;h=41d642f ]

HTTPCORE-390: Connection pool implementation with higher concurrency characteristics and lax
total and per route max guarantees.


> Lock-less connection pools
> --------------------------
>
>                 Key: HTTPCORE-390
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-390
>             Project: HttpComponents HttpCore
>          Issue Type: Improvement
>          Components: HttpCore NIO
>    Affects Versions: 4.3.2
>            Reporter: Stephane Routhiau
>            Assignee: Oleg Kalnichevski
>              Labels: concurrency, performance
>             Fix For: 5.0
>
>         Attachments: AbstractNIOConnPool.java, ConcurrentLinkedQueue.java, contention
on lease and release.png, DefaultConnectingIOReactor.java, patch-performance nio pool.patch,
RouteSpecificPool.java, SessionRequestCallback.java
>
>
> AbstractNIOConnPool use a ReentrantLock for lease and release connection.
> We have noticed important contention when we try to use hundreds of connexions to the
same host, the lock is to vast.
> I managed to rework a part of the code so there is no more use of a ReentrantLock, but
use of ConcurrentHashMap and so on.
> The unit tests are ok and the load tests we have made on the patch version are about
40 % faster under heavy load
> Please find attached patch file againt http-nio 4.3.2 and the modified sources files
of http-nio 4.3.2



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