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https://issues.apache.org/jira/browse/ARTEMIS-2399?focusedWorklogId=267999&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-267999
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ASF GitHub Bot logged work on ARTEMIS-2399:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 26/Jun/19 21:35
Start Date: 26/Jun/19 21:35
Worklog Time Spent: 10m
Work Description: michaelandrepearce commented on pull request #2730:
ARTEMIS-2399 Fix performance degradation when there are a lot of subscribers
URL: https://github.com/apache/activemq-artemis/pull/2730#discussion_r297876659
##########
File path:
artemis-server/src/main/java/org/apache/activemq/artemis/core/paging/cursor/impl/PageCursorProviderImpl.java
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@@ -209,7 +235,16 @@ private PageCache readPage(long pageId,
}
page.open();
final long startedReadPage = System.nanoTime();
- List<PagedMessage> pgdMessages = page.read(storageManager);
+ List<PagedMessage> pgdMessages;
+ if (indexCache == null) {
+ pgdMessages = page.read(storageManager);
+ } else {
+ TreeMap<Integer, Integer> messageNumberToOffset = new TreeMap<>();
Review comment:
If this has to stay, Can we use a primitive map variant.
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Issue Time Tracking
-------------------
Worklog Id: (was: 267999)
Time Spent: 4h 20m (was: 4h 10m)
> Fix performance degradation when there are a lot of subscribers
> ---------------------------------------------------------------
>
> Key: ARTEMIS-2399
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2399
> Project: ActiveMQ Artemis
> Issue Type: Improvement
> Components: Broker
> Affects Versions: 2.9.0
> Environment: broker 2.9.0
> cpu: 4 cores, memory: 8G, disk: ssd 500G
> broker.xml:
> <thread-pool-max-size>60</thread-pool-max-size>
> <address-setting match="#">
> <max-size-bytes>51Mb</max-size-bytes>
> <page-size-bytes>50Mb</page-size-bytes>
> <page-max-cache-size>1</page-max-cache-size>
> <address-full-policy>PAGE</address-full-policy>
> </address-setting>
> <message-expiry-scan-period>-1</message-expiry-scan-period>
> Reporter: yangwei
> Priority: Major
> Time Spent: 4h 20m
> Remaining Estimate: 0h
>
> We noticed that there was a significant drop in performance when entering
> page mode in the case of multiple subscribers.
> We created a topic and 100 queues bound to it. We ran our _GrinderRunner
> test_ in our inner test infra cluster with 500 threads producing message and
> 560 threads, each one picked a random queue to subscribe. The test showed
> performance is bad: 13000 msg/s sent and 5000 msg/s received.
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