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https://issues.apache.org/jira/browse/TS-159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12832235#action_12832235
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Leif Hedstrom commented on TS-159:
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One final comment, I don't have hard numbers, but CPU usage does increase as
performance goes down.
> Severe performance degradation with transaction logging enabled.
> ----------------------------------------------------------------
>
> Key: TS-159
> URL: https://issues.apache.org/jira/browse/TS-159
> Project: Traffic Server
> Issue Type: Bug
> Components: Logging
> Reporter: Leif Hedstrom
> Priority: Critical
> Fix For: 2.0.0
>
>
> With logging enabled, e.g.
> CONFIG proxy.config.log2.logging_enabled INT 3
> CONFIG proxy.config.log2.squid_log_enabled INT 1
> CONFIG proxy.config.log2.squid_log_is_ascii INT 0
> ATS "trunk" (and "dev" branch) suffers from serious performance degradation
> over time. I ran a number of tests, each 30s long, fetching a 500 byte long
> object from cache (ram cache enabled). The tests starts off doing about 20k
> QPS on my box, but with every iteration, it degrades (more so in the
> beginning). Within 30 minutes, performance had dropped to 3,800 QPS, at which
> point the process segfaulted (I think it's a meaningless trace though, but
> attaching it nonetheless).
> The CPU is completely pegged at all times, so it's definitely doing less and
> less workload, using the same (or more) CPU. I did not observe any memory
> growth, so I don't think it's a memory leak per se (but could still obviously
> be related to starving some resource inside TS).
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