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https://issues.apache.org/jira/browse/TS-159?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Leif Hedstrom updated TS-159:
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Attachment: TS-159.diff
This diff fixes the problem, ignore the "indentation" fixes (indent did a
crappy job on this file, I fixed the worst of it). The issue is the
initialization part of the ctor, I think this gets called when iObject is
subclassed, which is wrong becuse the size is already properly set in the
::operator new.
I'm not a C++ expert in any way, so maybe jplevyak can correct me if this is
wrong. It does seem to solve the problem though.
> 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
> Assignee: Leif Hedstrom
> Priority: Critical
> Fix For: 2.0.0a
>
> Attachments: TS-159.diff
>
>
> 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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