For a few days, now, I have been running a piCorePlayer 6.1.0 with LMS
on a Pi 4 B with 2G of memory. I mainly use the Pi to transcode AAC
streams from Tidal. There are no additional plug-ins installed.
I observe the following behaviour: After the LMS is started, it will run
without complaints for about a day, and then the connected players will
suddenly start to re-buffer all the time and eventually stop playing
altogether.
I have been looking at CPU and memory consumption on the Pi (I don't
quite understand how the in-memory file system fits into it) and noticed
that the main Perl process seems to be hogging memory. When a certain
limit is exceeded, the transcoding processes suddenly will not have as
much memory as they used to, and the re-buffering will start. I have
monitored the system with top for a day and copied the output.
file system:
Code:
--------------------
Filesystem Size Used Available Use% Mounted on
tmpfs 1.7G 17.8M 1.7G 1% /
tmpfs 954.3M 0 954.3M 0% /dev/shm
/dev/mmcblk0p2 29.1G 175.0M 28.3G 1% /mnt/mmcblk0p2
--------------------
LMS restarted:
Code:
--------------------
Mem: 388012K used, 1566340K free, 14432K shrd, 31648K buff, 163864K cached
CPU: 0.2% usr 0.1% sys 0.0% nic 99.5% idle 0.0% io 0.0% irq 0.0% sirq
Load average: 0.14 0.08 0.08 2/139 12551
PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND
12463 1 tc S 100m 5.2 0 0.3 {slimserver.pl} /usr/bin/perl
/usr/local/slimserver/slimserver.pl --daemon --user tc --group staff
--------------------
playing and scanning:
Code:
--------------------
Mem: 453652K used, 1500700K free, 14652K shrd, 31648K buff, 178824K cached
CPU: 25.2% usr 0.5% sys 0.0% nic 74.1% idle 0.0% io 0.0% irq 0.0% sirq
Load average: 0.37 0.12 0.09 2/144 12573
PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND
12463 1 tc S 103m 5.4 1 0.8 {slimserver.pl} /usr/bin/perl
/usr/local/slimserver/slimserver.pl --daemon --user tc --group staff
12572 12463 tc R 62140 3.1 1 24.5 /usr/local/bin/perl
/usr/local/slimserver/scanner.pl
--logconfig=/usr/local/slimserver/prefs/log.conf --novideo --onlinelibrary
--prefsdir=/usr/local
12571 12569 tc S 5404 0.2 1 0.1
/usr/local/slimserver/Bin/armhf-linux/flac -cs --totally-silent
--compression-level-0 --ignore-chunk-sizes -
12569 12463 tc S 3200 0.1 2 0.0 sh -c
"/usr/local/slimserver/Bin/armhf-linux/faad" -q -w -f 1 - |
"/usr/local/slimserver/Bin/armhf-linux/flac" -cs --totally-silent
--compression-lev
12570 12569 tc S 2780 0.1 0 0.2
/usr/local/slimserver/Bin/armhf-linux/faad -q -w -f 1 -
--------------------
playing ...:
Code:
--------------------
Mem: 478556K used, 1475796K free, 18952K shrd, 31652K buff, 207356K cached
CPU: 1.3% usr 0.1% sys 0.0% nic 98.4% idle 0.0% io 0.0% irq 0.0% sirq
Load average: 0.25 0.11 0.03 3/140 13831
PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND
12463 1 tc S 140m 7.3 2 0.4 {slimserver.pl} /usr/bin/perl
/usr/local/slimserver/slimserver.pl --daemon --user tc --group staff
13782 13780 tc S 5404 0.2 2 0.3
/usr/local/slimserver/Bin/armhf-linux/flac -cs --totally-silent
--compression-level-0 --ignore-chunk-sizes -
13780 12463 tc S 3200 0.1 2 0.0 sh -c
"/usr/local/slimserver/Bin/armhf-linux/faad" -q -w -f 1 - |
"/usr/local/slimserver/Bin/armhf-linux/flac" -cs --totally-silent
--compression-lev
13781 13780 tc S 2780 0.1 2 0.7
/usr/local/slimserver/Bin/armhf-linux/faad -q -w -f 1 -
--------------------
out of memory:
Code:
--------------------
Mem: 536364K used, 1417988K free, 21760K shrd, 31656K buff, 210196K cached
CPU: 0.9% usr 0.4% sys 0.0% nic 98.4% idle 0.0% io 0.0% irq 0.0% sirq
Load average: 0.07 0.08 0.03 1/140 15290
PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND
12463 1 tc S 198m 10.3 0 1.0 {slimserver.pl} /usr/bin/perl
/usr/local/slimserver/slimserver.pl --daemon --user tc --group staff
15290 15288 tc S 5272 0.2 2 0.0
/usr/local/slimserver/Bin/armhf-linux/flac -cs --totally-silent
--compression-level-0 --ignore-chunk-sizes -
15288 12463 tc S 3200 0.1 0 0.0 sh -c
"/usr/local/slimserver/Bin/armhf-linux/faad" -q -w -f 1 - |
"/usr/local/slimserver/Bin/armhf-linux/flac" -cs --totally-silent
--compression-lev
15289 15288 tc S 2748 0.1 1 0.0
/usr/local/slimserver/Bin/armhf-linux/faad -q -w -f 1 -
--------------------
The Perl process is constantly growing from 100m to about 200m. The faad
and flac processes run with 5404 and 2780 k of memory consistently all
day until the re-buffering starts. I can't make anything of it since the
O/S still seems to have plenty of memory to spend on caching, but maybe
somebody else can.
scaleo home server 2105 & picoreplayer 6.1.0 | logitech media server
8.0.0 | server power control 20120716.103808 |
transporter & duet & touch & boom & radio | rotel rc-995 & rmb-100 |
nubert nuvero 140
------------------------------------------------------------------------
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