| --- | Log | opened Wed Jul 23 00:00:25 2008 |
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| 00:31 | <gregbrady> | I'm looking to replace my software based ATI tuner card, which seems of little value, and I was wondering what the best card to get was? |
| 00:31 | <gregbrady> | Standard Definition |
| 00:32 | <gregbrady> | AMD 3500+ |
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| 00:35 | <Anduin> | gregbrady: You want #mythtv-users |
| 00:35 | <gregbrady> | Sorry about that |
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| 01:45 | <pablo> | hi, do i need any special service from my tv provider to be able to use mythtv? form where does it gets the channels schedule? |
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| 03:27 | <anykey_> | Is the coreavc patch still working? |
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| 13:51 | <danielk22> | Has anyone looked at QMap::operator[] lately? See: http://pastebin.ca/1080984 |
| 13:54 | <danielk22> | Valgrind is telling me that it leaks-a-lot... This is just one example, it's reporting this in a number of places where map[key] = newvalue is done where there already exists a value in the map for that key. |
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| 13:57 | <janneg> | danielk22: what exact QMap type is it? I wouldn't expect it to free the oldvalue if a new value is assigned to the same key |
| 13:57 | <danielk22> | QMap<uint,uint> |
| 13:58 | <danielk22> | actually in this case QMap<uint,int> |
| 13:58 | <janneg> | that shouldn't leak memory, both |
| 13:58 | <danielk22> | it appears to be leaking RB-tree nodes, not data. |
| 13:58 | <danielk22> | i.e. not application data |
| 13:59 | <danielk22> | rather qt library data appears to be leaking. |
| 13:59 | <danielk22> | It may just be Valgrind lying.. I'm downloading the qt sources... |
| 14:00 | <janneg> | s/lying/being confused/ |
| 14:04 | <danielk22> | FYI Other than this, I can't seem to find any real leaks... |
| 14:07 | <stuartm> | frontend or backend? There is the often reported backend leak somewhere in the PES packet stuff |
| 14:08 | <danielk22> | I'm only looking at the backend. |
| 14:08 | <danielk22> | The only apparent leak in the backend PES packet stuff is the QMap::operator[] |
| 14:09 | <danielk22> | Of course it may only be in the DVB side of the code and not the ATSC side, in which case I wouldn't see it. |
| 14:09 | <janneg> | stuartm: that's probably caused by valgrind being confused by our custom memory allocator |
| 14:09 | <janneg> | no, I haven't seen apparent leaks in the DVB side |
| 14:10 | <stuartm> | janneg: possibly, but users are reporting a real growth in memory when recording back to back over a compressed period |
| 14:11 | <stuartm> | I took a look at it for a couple of hours a while back, I couldn't see anything - QMap wasn't showing up in valgrind at all, the only question mark I had was over a particular corner case when we discarded incomplete packets |
| 14:11 | <danielk22> | stuartm: true, which is why I looked today.. I wish I had found something so I could fix it. |
| 14:11 | <stuartm> | but then I became distracted by other things - mpeg stream parsing isn't my area of expertise |
| 14:12 | <danielk22> | I did find two small leaks, which I'll be patching shortly. |
| 14:15 | <danielk22> | hmm, maybe it's some particular EITFixup code? |
| 14:19 | <janneg> | maybe, I can test only a small part of the fixups |
| 14:23 | <danielk22> | k, looking at qmap.h it looks ok to me, so I'll ignore valgrind on that one.. |
| 14:24 | <gnome42> | danielk22: Does always using _pat_version.insert(tsid, version) do the right thing? Quoting qt3/4 docs, "If there is already an item with the key key, that item's value is replaced with value." |
| 14:24 | <gnome42> | oh, ignoring it now, ok. :) |
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| 19:48 | <danielk22> | heh, after running mythbackend for several hours valgrind reports 1,106 bytes lost. I don't think I'm doing whatever triggers the leak. |
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| 20:23 | <Chutt> | danielk22, heh |
| 20:23 | <Chutt> | when i first read that, i thought "that's huge!", quickly followed by "oh, this is for a real computer" |
| 20:24 | <danielk22> | hehehe, yes for a PIC it be huge :) |
| 20:25 | <Chutt> | i'm so used to embedded crap these days |
| 20:27 | <danielk22> | Honestly I don't know if those bytes are even really leaked I looked at the code in question it looked ok. |
| 20:27 | <Chutt> | heh |
| 20:28 | <danielk22> | But I didn't spend that much time on in, since these are obviously not the source of the big leak people are seeing. |
| 20:32 | <Chutt> | what about big chunks of potentially lost/still reachable data? |
| 20:32 | <Chutt> | well, abnormally large chunks of that, rather |
| 20:33 | <danielk22> | 2,247,419 bytes in 18,940 blocks. |
| 20:34 | <danielk22> | but I had disabled the MPEG allocator, so anything lost there would have shown up as really being lost. |
| 20:35 | <danielk22> | possibly lost: 124,628 bytes in 3,582 blocks. |
| 20:35 | <Chutt> | nothing major, then |
| 20:35 | <danielk22> | Of the possibly lost: 117,440 bytes are just thread local storage which I know isn't really lost. |
| 20:36 | <danielk22> | yeah, I expected more than 2MB considering buffers, etc. |
| 20:37 | <danielk22> | there must be some code path I'm not exercising... |
| 20:37 | <Chutt> | EIT? |
| 20:38 | <danielk22> | well I was collecting ATSC EIT. And Janne said he's not seeing leaks with DVB EIT |
| 20:38 | <danielk22> | But there are also the fixups, those are specific to broadcasters or even channels.. |
| 20:39 | <danielk22> | And it tends to not be the best code because there is usually only one or maybe two people who contribute to each one. |
| 20:40 | <danielk22> | We review them by reading em... but things can slip through |
| 20:40 | <danielk22> | anyway, dinner is ready... ttyl |
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| 20:42 | <Nostahl> | hi guys |
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| --- | Log | closed Thu Jul 24 00:00:40 2008 |