[mythtv-users] Mythtv 0.24 Acer Revo ALSA WriteAudio buffer underruns
khanh at khanh.net
Mon Mar 7 03:17:40 UTC 2011
On Sat, Mar 5, 2011 at 10:37 PM, Brian J. Murrell <brian at interlinx.bc.ca> wrote:
> On 11-03-05 12:35 PM, pnetherwood at email.com wrote:
>> SELECT c.chanid, c.sourceid, p.starttime, p.endtime, p.title, p.subtitle, p.description, c.channum, c.callsign, c.name, oldrecduplicate, p.category, record.recpriority, record.dupin, recduplicate, findduplicate, record.type, record.recordid, p.starttime - INTERVAL record.startoffset minute AS recstartts, p.endtime + INTERVAL record.endoffset minute AS recendts, p.previouslyshown, record.recgroup, record.dupmethod, c.commmethod, capturecard.cardid, cardinput.cardinputid,p.seriesid,
>> p.programid, p.category_type, p.airdate, p.stars, p.originalairdate, record.inactive, record.parentid, (CASE record.type WHEN 6 THEN record.findid WHEN 9 THEN to_days(date_sub(p.starttime, interval time_format(record.findtime, '%H:%i') hour_minute)) WHEN 10 THEN floor((to_days(date_sub(p.starttime, interval time_format(record.findtime, '%H:%i') hour_minute)) - record.findday)/7) * 7 + record.findday WHEN 7 THEN record.findid ELSE 0 END) , record.playgroup, oldrecstatus.recstatus, oldrecstatus.reactivate, p.videoprop+0, p.subtitletypes+0, p.audioprop+0, record.storagegroup, capturecard.hostname, recordmatch.oldrecstatus, record.avg_delay, c.recpriority + cardinput.recpriority + (cardinput.cardinputid = record.prefinput) * 2 AS powerpriority
>> FROM recordmatch
>> INNER JOIN record ON (recordmatch.recordid = record.recordid)
>> INNER JOIN program AS p ON ( recordmatch.chanid = p.chanid AND recordmatch.starttime = p.starttime AND recordmatch.manualid = p.manualid )
>> INNER JOIN channel AS c ON ( c.chanid = p.chanid )
>> INNER JOIN cardinput ON (c.sourceid = cardinput.sourceid)
>> INNER JOIN capturecard ON (capturecard.cardid = cardinput.cardid) LEFT JOIN oldrecorded as oldrecstatus ON ( oldrecstatus.station = c.callsign AND oldrecstatus.starttime = p.starttime AND oldrecstatus.title = p.title )
>> WHERE p.endtime >= NOW() - INTERVAL 1 DAY ORDER BY record.recordid DESC;
> That's quite the query. On my backend it returns 3837 rows.
>> I'd be very interested how long the query takes to run on other peoples machines.
> 5.5 seconds from a remote client, and that's after having run it a few
> times, so that with hot caches. It tooks 6s a few hours later.
>> Mine takes on average over 3 seconds.
> You can see, mine is a whole lot longer than 3 seconds. I don't have
> any illusions that I have a terribly fast backend though. AMD
> Athlon(tm) XP 2800+, 1GB memory. Mysql database is on a FUJITSU
> MPF3153AT which hdparm reports has delivering 23MB/s.
>> I do have 8 tv tuner cards (4 with multirec)
> I have 5. 4 analog and one digital with 3 multirecs.
I ran the same query and it takes between 4 and 5 seconds each time.
It returns 7,132 records! My master backend is a Core2Duo E7200 at
2.53GHz, 4GB RAM. I've got 2 digital (HDHR, no multirec) and 2 analog
tuners (one is on a slave backend).
I have to say though that this query did not spike MySQL to 100%.
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