#359: CPU spike on metadata updates
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Reporter: humanclay | Owner: admin
Type: Bugs | Status: new
Priority: 10 | Milestone: NEAR FUTURE
Component: Liquidsoap | Version: 0.9.2+svn
Keywords: | Mac: 0
Linux: 0 | Netbsd: 0
Other: 1 | Freebsd: 1
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The primary machine that I have experienced this issue on is:
VIA C7 Processor 1000MHz with 512MB of RAM
FreeBSD 7.1 i386.
Liquidsoap 0.9.2-2 using OSS input module
aotuv 20090303 libvorbis (http://www.geocities.jp/aoyoume/aotuv/)
I have run these tests using a single vorbis stream. I have found that
regardless of the quality level (-2.0, -1.0, 0), the skips can occur
during metadata changes. In some situations I have found that the stream
continues to loop the same audio over and over again and does not get
unstuck until liquidsoap is restarted, which is really bad.
I was able to make the skips occur by rapidly copy and pasting
"meta.insert title='metadata'" over and over again into the telnet
session. When skips occurred they were quite noticeable.
I noticed this in top:
Under normal conditions:
CPU: 35.2% user, 0.0% nice, 2.2% system, 3.7% interrupt, 58.8% idle
During metadata updates:
CPU: 98.9% user, 0.0% nice, 0.7% system, 0.4% interrupt, 0.0% idle
(It took me awhile to be able to copy-paste this from top as the CPU
quickly spiked up and then went right back down)
Interestingly enough, I performed the same tests on an Intel(R) Pentium(R)
4 CPU 3.00GHz with 1GB of RAM, again running FreeBSD 7.1 i386. The skips
also occurred on this machine but they were far less noticeable. The audio
just had a little "blip" in it on metadata updates.
So it appears that there is a quick spike in CPU usage that is happening
on metadata updates, which is exemplified on slower hardware.
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Ticket URL: <http://savonet.rastageeks.org/ticket/359>
Savonet <http://savonet.rastageeks.org/>
Let's program our stream !
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