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https://issues.apache.org/jira/browse/LOG4J2-1318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15213443#comment-15213443
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Remko Popma commented on LOG4J2-1318:
-------------------------------------
[~garydgregory], [[email protected]] can you take a look at
SLF4JLoggerContext? It looks like the {{getLogger(String, MessageFactory)}}
method currently ignores the MessageFactory, and when I try to fix that in the
spirit of LOG4J2-1180, the test in log4j-to-slf4j org.a.l.slf4j.LoggerTest
breaks... (getLogger_String_MessageFactoryMismatchNull and
getLogger_String_MessageFactoryMismatch)
Is there something special about SLF4J Loggers that they must be unique by name
only, not by name/MessageFactory? Or are the current implementation and the
test simply wrong - LOG4J2-1180 was not addressed correctly here?
> LoggerContext#getLogger causes heavy GC overhead
> ------------------------------------------------
>
> Key: LOG4J2-1318
> URL: https://issues.apache.org/jira/browse/LOG4J2-1318
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.5
> Reporter: Rodrigo Merino
> Assignee: Remko Popma
> Labels: performance
>
> With the changes from LOG4J2-1180, when running performance testing
> scenarios, we are experiencing some throughput degradations due to an
> increase in the GC stall time.
> With the changes from LOG4J2-1180, the GC stall went from ~6% to ~11%, having
> an impact on the application of a reduction of ~32% of the operations
> throughput. The memory allocation rate both before and after the change is
> 4GB/s and 12GB/s respectively.
> In both cases, the relevant jvm configuration params were:
> {code}
> -XX:+PrintGCApplicationStoppedTime -XX:+PrintGCDetails -XX:+PrintGCDateStamps
> -XX:+PrintTenuringDistribution -XX:ErrorFile=%MHOME%/logs/err.log
> -Xloggc:%HOME%/logs/gc.log -XX:+HeapDumpOnOutOfMemoryError
> -XX:+AlwaysPreTouch -Xms2048m -XX:PermSize=256m -XX:MaxPermSize=256m
> -XX:+UseParNewGC -XX:NewSize=1024m -XX:+UseNUMA
> {code}
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