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https://issues.apache.org/jira/browse/TS-1405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13443773#comment-13443773
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Leif Hedstrom commented on TS-1405:
-----------------------------------
Hmmm, I need to play with this some more, but with "few" connections (300), the
time wheel patch has very noticeable performance degredation. Just doing a
quick test (I will fiddle with it some more), I get:
{code}
http_load -parallel 100 -seconds 20 -keep_alive 100 /tmp/URL
2644059 fetches on 26310 conns, 300 max parallel, 2.644059E+06 bytes, in 20
seconds
1 mean bytes/fetch
132202.7 fetches/sec, 1.322027E+05 bytes/sec
msecs/connect: 0.156 mean, 1.884 max, 0.048 min
msecs/first-response: 2.156 mean, 82.044 max, 0.076 min
tinkerballa (21:15) 272/0 $ ~/benchit.sh 100 20 100
http_load -parallel 100 -seconds 20 -keep_alive 100 /tmp/URL
3275553 fetches on 32567 conns, 300 max parallel, 3.275550E+06 bytes, in 20
seconds
1 mean bytes/fetch
163776.5 fetches/sec, 1.637765E+05 bytes/sec
msecs/connect: 0.171 mean, 2.251 max, 0.047 min
msecs/first-response: 1.440 mean, 117.784 max, 0.090 min
{code}
The first is with the time wheel patch, the second is basic trunk (which is
still a little slower than I normally would see it, need to look into that
too). But both throughput (QPS) and latency is worse with the patch.
> apply time-wheel scheduler about event system
> ----------------------------------------------
>
> Key: TS-1405
> URL: https://issues.apache.org/jira/browse/TS-1405
> Project: Traffic Server
> Issue Type: Improvement
> Components: Core
> Affects Versions: 3.2.0
> Reporter: kuotai
> Assignee: kuotai
> Fix For: 3.3.0
>
> Attachments: time-wheel.patch
>
>
> when have more and more event in event system scheduler, it's worse. This is
> the reason why we use inactivecop to handler keepalive. the new scheduler is
> time-wheel. It's have better time complexity(O(1))
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