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https://issues.apache.org/jira/browse/JAMES-3487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17256901#comment-17256901
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ASF GitHub Bot commented on JAMES-3487:
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chibenwa commented on a change in pull request #285:
URL: https://github.com/apache/james-project/pull/285#discussion_r550433315
##########
File path: docs/modules/servers/pages/distributed/configure/index.adoc
##########
@@ -59,4 +59,27 @@ By omitting these files, no extra behaviour is added.
** xref:distributed/configure/spam.adoc[This page] documents Anti-Spam setup
with SpamAssassin.
** xref:distributed/configure/remote-delivery-error-handling.adoc[This page]
proposes a simple strategy for RemoteDelivery error handling.
** xref:distributed/configure/collecting-contacts.adoc[This page] documents
contact collection
-** xref:distributed/configure/collecting-events.adoc[This page] documents
event collection
\ No newline at end of file
+** xref:distributed/configure/collecting-events.adoc[This page] documents
event collection
+
+== System properties
+
+Some tuning can be done via system properties. This includes:
+
+.System properties
+|===
+| Property name | explanation
+
+| james.message.memory.threshold
+| (Optional). String (size, integer + size units, example: `12 KIB`, supported
units are bytes KIB MIB GIB TIB). Defaults to 100KIB.
+This governs the threshold MimeMessageInputStreamSource relies on for storing
MimeMessage content on disk.
+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.
+
+
+| james.message.usememorycopy
+|Optional. Boolean. Defaults to false. Recommended value is true.
Review comment:
that is a typo. Of course MUST be false
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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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