[jira] [Commented] (TIKA-2645) Reuse SAXParsers where possible

["Tim Allison (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TIKA-2645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16482862#comment-16482862 ] 

Tim Allison commented on TIKA-2645:
-----------------------------------

XML root detection before (time in millis)...with the pool size equal to the thread count in both tests.

20 Threads:
||Run||No Pool||With Pool||
|1|5897|3165|
|2|5548|3130|
|3|5506|3105|

Single thread:
||Run||No Pool||With Pool||
|1|1790|912|
|2|1737|863|
|3|1702|861|



> Reuse SAXParsers where possible
> -------------------------------
>
>                 Key: TIKA-2645
>                 URL: https://issues.apache.org/jira/browse/TIKA-2645
>             Project: Tika
>          Issue Type: Task
>            Reporter: Tim Allison
>            Priority: Major
>
> [~wastl-nagel] pointed out on the [user list|https://lists.apache.org/thread.html/54913f29cd83bba175f77a2d6a4902bb3a5cba2fa495bbfd6012024a@%3Cuser.tika.apache.org%3E] that there can be thread contention when creating SAXParsers.  [~jukkaz] recommended pooling SAXParsers.
> I noticed a modest improvement in speed when parsing docx files with our SAX based parser, and I suspect that [~wastl-nagel] will find an even greater improvement during detection because we're currently creating a new SAXParser on every call to detect an XML root.



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