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https://issues.apache.org/jira/browse/TS-3753?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pavel Vazharov updated TS-3753:
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Attachment: usi.png
null-transform-cache.patch
> High CPU iowait with null-transform on a content from the cache.
> ----------------------------------------------------------------
>
> Key: TS-3753
> URL: https://issues.apache.org/jira/browse/TS-3753
> Project: Traffic Server
> Issue Type: Bug
> Components: Plugins, TS API
> Reporter: Pavel Vazharov
> Attachments: null-transform-cache.patch, usi.png
>
>
> Hi,
> I'm trying to calculate some stats doing null-transform on a content served
> from the cache. However, I observed high CPU iowait when doing this. I
> isolated the issue to be related to the case when we do transformation on a
> content served from the cache. Please, see the attached few lines patch which
> when applied to the null-transform plugin causes high CPU iowait. Note also
> that when I tried the original null-transform plugin I didn't observe such
> increased CPU iowait. Please, see also the attached picture where you can see
> the increased CPU iowait (between 15:30 and 16:30 in red) when I started the
> test with null-transform from cache.
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