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https://issues.apache.org/jira/browse/JAMES-3487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17256899#comment-17256899
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ASF GitHub Bot commented on JAMES-3487:
---------------------------------------
jeantil commented on a change in pull request #285:
URL: https://github.com/apache/james-project/pull/285#discussion_r550432766
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File path: src/site/xdoc/server/config-system.xml
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@@ -151,6 +151,27 @@
</subsection>
+ <subsection name="System properties">
+
+ <p>Some tuning can be done via system properties. This
includes:</p>
+
+ <dl>
+ <dt><strong>james.message.memory.threshold</strong></dt>
+ <dd>(Optional). String (size, integer + size units,
example: `12 KIB`, supported units are bytes KIB MIB GIB TIB). Defaults to
100KIB. <br/>
+ This governs the threshold
MimeMessageInputStreamSource relies on for storing MimeMessage content on disk.
<br/>
+ Below, data is stored in memory. Above data is stored
on disk.
+ Lower values will lead to longer processing time but
will minimize heap memory usage. Modern SSD hardware
+ should however support a high throughput. Higher
values will lead to faster single mail processing at the cost
+ of higher heap usage.
+ </dd>
+
+ <dt><strong>james.message.usememorycopy</strong></dt>
+ <dd>Optional. Boolean. Defaults to false. Recommended
value is true. <br/>
Review comment:
same as above on recommended value
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> Configure MimeMessageInputStreamSource THRESHOLD
> ------------------------------------------------
>
> Key: JAMES-3487
> URL: https://issues.apache.org/jira/browse/JAMES-3487
> Project: James Server
> Issue Type: Improvement
> Components: James Core
> Reporter: Benoit Tellier
> Priority: Major
>
> This represents the point at which we should switch from a memory storage
> into a file storage.
> Defaults is 100 Kb.
> Obviously this parameter is important:
> - Higher values will operate mostly in-memory thus will have low latencies
> but will trash the heap and might trigger a GC hell.
> - Lower values will defensively operate on files. Higher latencies but
> predictable throughtput. Modern SSDs and FS cache should enable to keep up
> with high rates.
> Optimally we should have some bench showing the impact of this parameter.
> Related to JAMES-3477.
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