LinHES Forums :: View topic - What is nice and why is it using 80% cpu?

top - 08:40:27 up 14:25, 2 users, load average: 10.17, 9.84, 6.51
Tasks: 106 total, 2 running, 104 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.8% user, 16.6% system, 72.5% nice, 10.1% idle
Mem: 256524k total, 252644k used, 3880k free, 680k buffers
Swap: 1044216k total, 333124k used, 711092k free, 9636k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ Command

2620 root 15 0 660 604 428 R 15.2 0.2 0:12.40 top
1778 mythtv 19 19 243m 215m 210m S 7.7 86.0 5:21.18 mythbackend
1686 mythtv 19 19 243m 215m 210m S 7.2 86.0 6:29.38 mythbackend
1877 mythtv 19 19 243m 215m 210m S 6.6 86.0 4:17.04 mythbackend
2066 mythtv 19 19 243m 215m 210m S 6.6 86.0 3:09.61 mythbackend
1428 mythtv 19 19 243m 215m 210m S 6.1 86.0 14:12.15 mythbackend
1975 mythtv 19 19 243m 215m 210m S 5.8 86.0 3:41.29 mythbackend
2042 mythtv 19 19 243m 215m 210m S 5.8 86.0 3:19.38 mythbackend
1491 mythtv 19 19 243m 215m 210m S 5.2 86.0 9:41.95 mythbackend
1577 mythtv 19 19 243m 215m 210m S 5.0 86.0 7:59.42 mythbackend
1640 mythtv 19 19 243m 215m 210m S 5.0 86.0 7:00.41 mythbackend
1732 mythtv 19 19 243m 215m 210m S 5.0 86.0 5:14.24 mythbackend
1927 mythtv 19 19 243m 215m 210m R 4.4 86.0 4:00.29 mythbackend
1829 mythtv 19 19 243m 215m 210m S 2.5 86.0 4:51.76 mythbackend
1937 mythtv 9 0 243m 215m 210m S 0.8 86.0 0:03.20 mythbackend
1438 mythtv 9 0 243m 215m 210m S 0.3 86.0 0:05.61 mythbackend
2068 mythtv 9 0 243m 215m 210m S 0.3 86.0 0:02.58 mythbackend
1 root 8 0 52 44 24 S 0.0 0.0 0:04.12 init
2 root 9 0 0 0 0 S 0.0 0.0 0:00.16 keventd
3 root 19 19 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd_CPU0
4 root 9 0 0 0 0 S 0.0 0.0 0:29.32 kswapd
5 root 9 0 0 0 0 S 0.0 0.0 0:00.00 bdflush
6 root 9 0 0 0 0 S 0.0 0.0 0:00.02 kupdated
8 root 9 0 0 0 0 S 0.0 0.0 0:01.12 kjournald
106 root 9 0 0 0 0 S 0.0 0.0 0:00.00 khubd
205 root 9 0 0 0 0 S 0.0 0.0 0:12.57 kjournald
286 root 9 0 232 124 124 S 0.0 0.0 0:00.02 pump
313 daemon 9 0 136 68 68 S 0.0 0.0 0:00.00 portmap
429 root 9 0 296 244 244 S 0.0 0.1 0:00.37 syslogd
444 root 9 0 1036 128 128 S 0.0 0.0 0:00.19 klogd
500 root 9 0 1132 176 156 S 0.0 0.1 0:00.10 apache
517 root 9 0 148 104 104 S 0.0 0.0 0:00.00 inetd
550 root 9 0 260 44 44 S 0.0 0.0 0:00.05 mysqld_safe
500 root 9 0 1136 180 160 S 0.0 0.1 0:00.10 apache

Dec 23 03:00:04 mythtv kernel: saa7115: decoder set size
Dec 23 03:00:05 mythtv kernel: saa7115: decoder disable output
Dec 23 03:00:05 mythtv kernel: saa7115: decoder enable output
Dec 23 03:14:56 mythtv -- MARK --
Dec 23 03:15:02 mythtv kernel: saa7115: decoder set picture bright=127 contrast=63 saturation=63 hue
=0
Dec 23 03:15:02 mythtv last message repeated 3 times
Dec 23 03:15:02 mythtv kernel: saa7115: decoder disable output
Dec 23 03:15:03 mythtv kernel: saa7115: decoder enable output
Dec 23 03:15:04 mythtv kernel: saa7115: decoder set picture bright=127 contrast=63 saturation=63 hue
=0
Dec 23 03:15:04 mythtv last message repeated 3 times
Dec 23 03:15:04 mythtv kernel: saa7115: decoder set size
Dec 23 03:15:04 mythtv kernel: saa7115: decoder disable output
Dec 23 03:15:04 mythtv kernel: saa7115: decoder enable output
Dec 23 03:34:56 mythtv -- MARK --
Dec 23 03:54:56 mythtv -- MARK --
Dec 23 04:15:00 mythtv -- MARK --
Dec 23 04:35:00 mythtv -- MARK --
Dec 23 04:55:01 mythtv -- MARK --
Dec 23 05:15:01 mythtv -- MARK --
Dec 23 05:35:01 mythtv -- MARK --
Dec 23 05:55:01 mythtv -- MARK --
Dec 23 06:15:01 mythtv -- MARK --
Dec 23 06:33:35 mythtv syslogd 1.4.1#10: restart.
Dec 23 06:55:01 mythtv -- MARK --
Dec 23 07:15:01 mythtv -- MARK --
Dec 23 07:35:01 mythtv -- MARK --
Dec 23 07:55:01 mythtv -- MARK --
Dec 23 08:15:01 mythtv -- MARK --
Dec 23 08:35:05 mythtv -- MARK --
Dec 23 08:55:07 mythtv -- MARK --

Author:	mccoyn [ Thu Dec 23, 2004 8:07 am ]
Post subject:	What is nice and why is it using 80% cpu?
I tried using mythfrontend this morning and it is very slow. When I finally got it to play something, it would drop most frames. I just had a slide show once every second or so. Here is what top looks like: Code: top - 08:40:27 up 14:25, 2 users, load average: 10.17, 9.84, 6.51 Tasks: 106 total, 2 running, 104 sleeping, 0 stopped, 0 zombie Cpu(s): 0.8% user, 16.6% system, 72.5% nice, 10.1% idle Mem: 256524k total, 252644k used, 3880k free, 680k buffers Swap: 1044216k total, 333124k used, 711092k free, 9636k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ Command 2620 root 15 0 660 604 428 R 15.2 0.2 0:12.40 top 1778 mythtv 19 19 243m 215m 210m S 7.7 86.0 5:21.18 mythbackend 1686 mythtv 19 19 243m 215m 210m S 7.2 86.0 6:29.38 mythbackend 1877 mythtv 19 19 243m 215m 210m S 6.6 86.0 4:17.04 mythbackend 2066 mythtv 19 19 243m 215m 210m S 6.6 86.0 3:09.61 mythbackend 1428 mythtv 19 19 243m 215m 210m S 6.1 86.0 14:12.15 mythbackend 1975 mythtv 19 19 243m 215m 210m S 5.8 86.0 3:41.29 mythbackend 2042 mythtv 19 19 243m 215m 210m S 5.8 86.0 3:19.38 mythbackend 1491 mythtv 19 19 243m 215m 210m S 5.2 86.0 9:41.95 mythbackend 1577 mythtv 19 19 243m 215m 210m S 5.0 86.0 7:59.42 mythbackend 1640 mythtv 19 19 243m 215m 210m S 5.0 86.0 7:00.41 mythbackend 1732 mythtv 19 19 243m 215m 210m S 5.0 86.0 5:14.24 mythbackend 1927 mythtv 19 19 243m 215m 210m R 4.4 86.0 4:00.29 mythbackend 1829 mythtv 19 19 243m 215m 210m S 2.5 86.0 4:51.76 mythbackend 1937 mythtv 9 0 243m 215m 210m S 0.8 86.0 0:03.20 mythbackend 1438 mythtv 9 0 243m 215m 210m S 0.3 86.0 0:05.61 mythbackend 2068 mythtv 9 0 243m 215m 210m S 0.3 86.0 0:02.58 mythbackend 1 root 8 0 52 44 24 S 0.0 0.0 0:04.12 init 2 root 9 0 0 0 0 S 0.0 0.0 0:00.16 keventd 3 root 19 19 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd_CPU0 4 root 9 0 0 0 0 S 0.0 0.0 0:29.32 kswapd 5 root 9 0 0 0 0 S 0.0 0.0 0:00.00 bdflush 6 root 9 0 0 0 0 S 0.0 0.0 0:00.02 kupdated 8 root 9 0 0 0 0 S 0.0 0.0 0:01.12 kjournald 106 root 9 0 0 0 0 S 0.0 0.0 0:00.00 khubd 205 root 9 0 0 0 0 S 0.0 0.0 0:12.57 kjournald 286 root 9 0 232 124 124 S 0.0 0.0 0:00.02 pump 313 daemon 9 0 136 68 68 S 0.0 0.0 0:00.00 portmap 429 root 9 0 296 244 244 S 0.0 0.1 0:00.37 syslogd 444 root 9 0 1036 128 128 S 0.0 0.0 0:00.19 klogd 500 root 9 0 1132 176 156 S 0.0 0.1 0:00.10 apache 517 root 9 0 148 104 104 S 0.0 0.0 0:00.00 inetd 550 root 9 0 260 44 44 S 0.0 0.0 0:00.05 mysqld_safe 500 root 9 0 1136 180 160 S 0.0 0.1 0:00.10 apache What stands out is the high nice usage, which I have no idea what it is and the many instances of mythbackend running. Any idea what caused this? I'll reboot it and that will probally fix it for now. I'll be away from home all next week and I'd like to get this fixed so it doesn't crash causing me to miss a lot of recordings. My system is a P3 550 MHz with a PVR350 to do most of the work. I've recorded while watching another recording and downloading a third recording to my computer without a problem before. The most recent change that I made was to downgrade ivtv to 0.2.0 and to change my tuner type to 44 instead of 39. See this thread for details. Last night was the first successful time I've recorded something past channel 61. mythbackend.log and mythbackend.log.1.gz don't show anything strange. Here is the end of the messages file. I think it looks normal, but I'm not sure. The rest of the file is just more of the same. Code: Dec 23 03:00:04 mythtv kernel: saa7115: decoder set size Dec 23 03:00:05 mythtv kernel: saa7115: decoder disable output Dec 23 03:00:05 mythtv kernel: saa7115: decoder enable output Dec 23 03:14:56 mythtv -- MARK -- Dec 23 03:15:02 mythtv kernel: saa7115: decoder set picture bright=127 contrast=63 saturation=63 hue =0 Dec 23 03:15:02 mythtv last message repeated 3 times Dec 23 03:15:02 mythtv kernel: saa7115: decoder disable output Dec 23 03:15:03 mythtv kernel: saa7115: decoder enable output Dec 23 03:15:04 mythtv kernel: saa7115: decoder set picture bright=127 contrast=63 saturation=63 hue =0 Dec 23 03:15:04 mythtv last message repeated 3 times Dec 23 03:15:04 mythtv kernel: saa7115: decoder set size Dec 23 03:15:04 mythtv kernel: saa7115: decoder disable output Dec 23 03:15:04 mythtv kernel: saa7115: decoder enable output Dec 23 03:34:56 mythtv -- MARK -- Dec 23 03:54:56 mythtv -- MARK -- Dec 23 04:15:00 mythtv -- MARK -- Dec 23 04:35:00 mythtv -- MARK -- Dec 23 04:55:01 mythtv -- MARK -- Dec 23 05:15:01 mythtv -- MARK -- Dec 23 05:35:01 mythtv -- MARK -- Dec 23 05:55:01 mythtv -- MARK -- Dec 23 06:15:01 mythtv -- MARK -- Dec 23 06:33:35 mythtv syslogd 1.4.1#10: restart. Dec 23 06:55:01 mythtv -- MARK -- Dec 23 07:15:01 mythtv -- MARK -- Dec 23 07:35:01 mythtv -- MARK -- Dec 23 07:55:01 mythtv -- MARK -- Dec 23 08:15:01 mythtv -- MARK -- Dec 23 08:35:05 mythtv -- MARK -- Dec 23 08:55:07 mythtv -- MARK --

Author:	Xsecrets [ Thu Dec 23, 2004 9:11 am ]
Post subject:
well my guess would be that you have commercial flagging turned on. I bet you'll have better luck if you turn it off. It's not like it works anyways.

Author:	tjc [ Thu Dec 23, 2004 11:24 am ]
Post subject:
The only time I've ever had a problem with commercial marking is when I had a corrupted recording or had lost the markers that get put in the DB for the start and end of the stream when it's recorded. In those cases it will tend to run forever at hight CPU usage if you let it. Other than that it just works. The results aren't always right - very much dependant on the channel - but it runs without any problems. On Cartoon Network (I'm an animation fan) and Sci-Fi (no comment ) the results are about 90-95% correct and it only takes a few seconds to go through and check/fix the ones that aren't. On other channels the results are mixed. When I recorded the Bourne Identity it did pretty well and about 75% of the marks were right or close to it. For other stuff I've recorded from TNT it's essentially useless.

Author:	Xsecrets [ Thu Dec 23, 2004 11:27 am ]
Post subject:
well I only said that because he has a very weak proc and with mythcomflag running in the background it could easily run him out of proc cycles.

Author:	mccoyn [ Thu Dec 23, 2004 1:00 pm ]
Post subject:
I do have commercial flagging on. It seems to catch 50% on cartoons and 25% on live action shows. It also leaves the last segment of The Daily Show as a commercial. I can turn it off without missing much. Does commercial flagging have to decode the entire video stream? If thats the case then it makes sense that my proc doesn't stand much of a chance.

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What is nice and why is it using 80% cpu? http://forums.linhes.org/viewtopic.php?f=6&t=3114	Page 1 of 1

Author:	alien [ Wed Jan 12, 2005 8:51 am ]
Post subject:
Nice isn't a process. It is the % of CPU usage by processes that have a lower priority ("nice" can be used to lower a processes priority). If you look at the NI column, the nice value is given. The >0 NI processes add up to about 72%. I'm not sure why there are so many mythbackends. I have that too and have often wondered. Maybe several are spawned to handle multiple frontends. Allen

Author:	Greg Frost [ Wed Jan 12, 2005 5:40 pm ]
Post subject:
I'm guessing that mythbackend is a multi-threaded application. Linux gives each thread a separate process id. This is not the case on some other Unix OSes (such as Tru64 Unix for instance). It makes determining the CPU usage of a single process a pain in the ass because you need to know which threads belong to which process.

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