| --- | Log | opened Fri Jun 27 00:00:01 2008 |
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| 04:25 | <The_Ball> | top |
| 04:25 | <The_Ball> | sorry, wrong window |
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| 12:48 | * | Cardoe kicks DVD stuff |
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| 13:29 | <danielk22> | cardoe: 'profile' is actually a good way to generate a mythtv for release, ubuntu also uses this. |
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| 13:57 | <Cardoe> | danielk22: yeah. it's decent for debugging as well |
| 13:58 | <Cardoe> | but there have been some situations where it's not |
| 13:58 | <Cardoe> | danielk22: now if you can fix the dvd player part.. so the WAF ratio goes up.. cause she's pissed right now |
| 13:59 | <danielk22> | what |
| 14:00 | <danielk22> | s the problem? |
| 14:00 | <danielk22> | the dvd player is really stanley's area of expertise. |
| 14:02 | <Cardoe> | http://svn.mythtv.org/trac/ticket/5478 |
| 14:02 | <Cardoe> | I managed to reproduce the issue listed at the end without pausing the dvd ever |
| 14:03 | <Cardoe> | which almost makes me think it's hardware |
| 14:03 | <Cardoe> | but no errors in dmesg |
| 14:04 | <Cardoe> | I'm only logging "important,general" currently.. |
| 14:05 | <danielk22> | This might actually be in an overlap of stuff I know about and stanley knows about. |
| 14:05 | <Chutt> | i just use a ps3 for dvd playback :p |
| 14:05 | <danielk22> | "-v playback,audio" might help with debugging... |
| 14:06 | <Chutt> | danielk22, we should someday split up GetFrame |
| 14:06 | <Chutt> | so that it doesn't process audio when video's behind/etc |
| 14:07 | <danielk22> | yep |
| 14:07 | <danielk22> | it has troubles with audio only files too. |
| 14:07 | <danielk22> | it works, but it's ugly |
| 14:07 | <Chutt> | that's the cause of the Audio buffer overflow stuff |
| 14:08 | <Chutt> | in cardoe's log, at least |
| 14:09 | <Cardoe> | danielk22: Alright. I'll change my logging and re-run the test |
| 14:10 | <Cardoe> | danielk22: thanks |
| 14:15 | <Cardoe> | any of you guys try gcc 4.3.x? |
| 14:15 | <Cardoe> | and trunk? |
| 14:21 | <clever> | im using 4.1.3 |
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| 14:49 | <_Joemama> | are most computer remote controls compatible with mythtv? |
| 14:59 | <danielk22> | Joemama wrong channel, you want #mythtv-users |
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| 15:25 | <stoffel_> | creatix |
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| 16:58 | <Chutt> | hrm |
| 16:58 | <Chutt> | i wonder if qt4 allows painting of qwidgets into qimages without too much effort |
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| 20:21 | <knowledgejunkie> | should mythbackend resident memory usage be fairly static over time? Since the memory-leak ticket war I've been measuing usage every 10m - and in 4 days RSS has grown 4x |
| 20:22 | <clever> | mine is at 51mb atm |
| 20:22 | <clever> | but the rss can vary alot over time depending on how much is swaped out |
| 20:22 | <clever> | virtual shouldnt change much(assuming its not accessing files) |
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| 20:36 | <knowledgejunkie> | I'm monitoring RSS and VSZ - the sum of these has grown from 350MB to 550MB over the 4 day period |
| 20:37 | <clever> | virtual is the entire memory space the program has |
| 20:37 | <knowledgejunkie> | RSS from 31MB to 123MB and VSZ from 321MB to 423MB |
| 20:37 | <clever> | rss is the chunk thats resident in ram |
| 20:38 | <clever> | my rss is at 69mb so far |
| 20:38 | <clever> | wait thats the fe |
| 20:38 | <clever> | backend rss 52mb |
| 20:38 | <clever> | virtual 275mb |
| 20:38 | <clever> | mythtv 412 1.3 10.3 282124 53676 pts/1 Sl+ Jun24 60:26 mythbackend -v network,upnp |
| 20:38 | <clever> | and its currently recording |
| 20:40 | <knowledgejunkie> | root 25385 1.4 11.8 423360 123172 ? Ssl Jun23 102:09 mythbackend --daemon --logfile /var/log/mythtv/mythbackend.log -v important,general --pidfile /var/run/mythbackend.pid --noupnp |
| 20:43 | <knowledgejunkie> | When I last shutdown mythbackend after ~2months uptime, VSZ was at 1.6GB - surely that isn't normal |
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| 20:55 | <clever> | yeah that isnt normal |
| 20:55 | <clever> | copy the /proc/PID/maps file |
| 20:55 | <clever> | that will tell you exactly where in the virtual memory the space is |
| 20:56 | <clever> | when i run it on my mythbackend |
| 20:56 | <clever> | i see these as the top 3(smallest first) |
| 20:56 | <clever> | b4cf1000-b553e000 r-xp 00000000 08:13 5652850 /usr/lib/libGLcore.so.1.0.9639 |
| 20:56 | <clever> | b74bd000-b7f80000 r-xp 00000000 fe:00 40095239 /media/mainlv/root/7.10/lib/libmythtv-0.22.so.0.22.0 |
| 20:56 | <clever> | 0816e000-0a2f9000 rw-p 0816e000 00:00 0 [heap] |
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| 21:02 | <knowledgejunkie> | don't have /proc/PID... |
| 21:02 | <clever> | i can see most of the virtual ram for mythbackend is to my heap |
| 21:02 | <clever> | replace PID with the pid of mythbackend |
| 21:03 | <knowledgejunkie> | oh... dear... it's... late... :) |
| 21:03 | <clever> | cat /proc/412/maps |/home/clever/bin/mapsort |sort -n|tail -n3 |
| 21:03 | <clever> | (mapsort is a php script i made to aid) |
| 21:03 | <clever> | all it does is print the diff between the 2 numbers b74bd000-b7f80000 |
| 21:03 | <clever> | (the size of the maping) |
| 21:04 | <clever> | http://pastebin.com/m1a38e974 |
| 21:04 | <knowledgejunkie> | thanks |
| 21:04 | <clever> | (thats a tab in the quotes) |
| 21:05 | <clever> | (the last set of quotes) |
| 21:05 | <knowledgejunkie> | ok |
| 21:05 | <clever> | cat /proc/412/maps |/home/clever/bin/mapsort |sort -n|tail -n3 |
| 21:05 | <clever> | or a bit simpler |
| 21:06 | <clever> | cat /proc/`pidof mythbackend`/maps |/home/clever/bin/mapsort |sort -n|tail -n3 |
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| 21:07 | <knowledgejunkie> | got 'em |
| 21:07 | <knowledgejunkie> | 10485760 b7346000-b7d46000 rwxp b7346000 00:00 0 |
| 21:07 | <knowledgejunkie> | 11472896 00667000-01158000 r-xp 00000000 03:02 4653409 /usr/local/lib/libmythtv-0.21.so.0.21.0 |
| 21:07 | <knowledgejunkie> | 44802048 08d0c000-0b7c6000 rwxp 08d0c000 00:00 0 [heap] |
| 21:07 | <clever> | looks pretty much the same as mine(except the glcore) |
| 21:08 | <knowledgejunkie> | yep - no GL or UPNP on that old backend |
| 21:08 | <clever> | the ones with the rwxp flags and no filename i think are extra chunks from new/malloc |
| 21:08 | <knowledgejunkie> | it does use EIT scanning though, and does have an ivtv card... |
| 21:08 | <clever> | ivtv here too |
| 21:08 | <clever> | a problem with alocing large chunks on the heap |
| 21:09 | <clever> | if you aloc a big chunk then a small one |
| 21:09 | <clever> | you get BIGBIGBIGBIGsmall |
| 21:09 | <clever> | then when you delete the big one you get ____________small |
| 21:09 | <clever> | giant hole in the heap that you cant release to the system:P |
| 21:09 | <knowledgejunkie> | nasty |
| 21:09 | <clever> | malloc/new will not use the heap if the block is 'too big' |
| 21:10 | <clever> | instead it makes a seperate maping |
| 21:10 | <clever> | like a 2nd heap |
| 21:10 | <clever> | but it cant be extended like the heap(doesnt work with brk()) |
| 21:12 | <knowledgejunkie> | Is this a general Linux memory management issue rather than specific to MythTV? (I'm not yet a C programmer) |
| 21:12 | <clever> | its general memory management in c++ i think |
| 21:12 | <clever> | http://www.linuxdevcenter.com/pub/a/linux/2006/11/30/linux-out-of-memory.html |
| 21:12 | <clever> | thats where i learned a good deal of it |
| 21:15 | <knowledgejunkie> | thanks for the link - skimming now |
| 21:16 | <clever> | linux(and windows) have virtual memory |
| 21:16 | <clever> | in linux you can map files to certain addresses in the memory with mmap(which shows up in /proc/PID/maps) |
| 21:17 | <clever> | but theres a few special maps allready inplace |
| 21:17 | <clever> | like the heap&stack |
| 21:19 | <knowledgejunkie> | right |
| 21:19 | <knowledgejunkie> | does this in anyway rule out memory leaks in an app where this memory behaviour is observed? |
| 21:19 | <knowledgejunkie> | should I next think about running valgrind on mythbackend? |
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| 21:21 | <Cardoe> | well.. I just attempted to play Apollo 13 while I was out of the house and logged it |
| 21:21 | <clever> | knowledgejunkie: valgrind will help find out if its realy leaking |
| 21:21 | <clever> | and exactly where |
| 21:23 | <clever> | memory fragmentation(within the heap) could let it grow over time, but it should level off and not keep growing |
| 21:23 | <clever> | playing with the first 2 tiny c programs will show how the system will run out of ram after using 3gig(on a 32bit box) |
| 21:23 | <clever> | or less if you actualy use that ram(enless you got 3gig of ram+swap) |
| 21:24 | <knowledgejunkie> | 1GB RAM and 1GB swap on the current machine |
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| 21:25 | <clever> | the linux kernel will by default let you alocate more ram then you have |
| 21:25 | <clever> | so i could alocate 3gig of ram on a 21mb ram box |
| 21:25 | <clever> | aslong as i just dont try to write to much of it |
| 21:26 | <knowledgejunkie> | I won't ask why that's a good idea |
| 21:26 | <clever> | some programs may alocate a ton of ram and not use it |
| 21:26 | <clever> | but you can turn it off if you dont like the idea:P |
| 21:26 | <jamesd__> | clever, it doesn't matter how much you write to it.. since it will swap it out as needed no matter how long it takes. |
| 21:27 | <clever> | jamesd__: enless i dont have the swap:P |
| 21:27 | <clever> | for example knowledgejunkie has 2gig of ram+swap |
| 21:27 | <jamesd__> | true |
| 21:27 | <clever> | so he can alocate a 3gig chunk of ram(roughtly) |
| 21:27 | <clever> | but only write to 2gig of it |
| 21:27 | <clever> | assuming NOTHING else was running |
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| 21:28 | <clever> | and because libs&heap&stack are randomly laid out in the virtualmem, you cant get 3gig in 1 peice |
| 21:28 | <clever> | just 98% of it in chunks |
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| 21:30 | <clever> | 64bit solves a number of these problems |
| 21:31 | <clever> | you could alocate a 1tb chunk of ram and not even use 50% of the address space |
| 21:31 | <knowledgejunkie> | even if I have less than 4GB? |
| 21:31 | <clever> | yes |
| 21:31 | <clever> | because the kernel doesnt actualy use the ram you alocate |
| 21:31 | <clever> | until you write to it |
| 21:31 | <jamesd__> | knowledgejunkie, its called virtual memory for a reason. |
| 21:31 | <clever> | that too |
| 21:32 | <clever> | 'There is no guarantee that allocated memory area is physically contiguous; it's only virtually contiguous.' |
| 21:33 | <clever> | (the data could easily get fragmented within psysical memory) |
| 21:34 | <Chutt> | my backend's been up for 11 days (with trunk), and has a resident size of 40MB |
| 21:34 | <clever> | but the resident can be anything, depending on how much other programs shoved out |
| 21:34 | <Chutt> | no swap in use :p |
| 21:34 | <clever> | lol |
| 21:35 | <clever> | for example my backend is 71mb resident |
| 21:35 | <Chutt> | the _frontend_ is using 215MB, however |
| 21:35 | <clever> | i just used a prog from http://www.linuxdevcenter.com/pub/a/linux/2006/11/30/linux-out-of-memory.html?page=1 to eat 150mb of ram |
| 21:35 | <clever> | pushing other crap out of the way |
| 21:36 | <clever> | now the backend has 39mb resident! |
| 21:36 | <knowledgejunkie> | my SDTV frontend is using 303MB virtual (85MB resident) |
| 21:36 | <clever> | mythtv 13502 14.3 7.9 240696 40864 pts/2 Sl+ 21:24 10:19 mythfrontend |
| 21:36 | <clever> | that varries wildly depending on theme |
| 21:36 | <knowledgejunkie> | mythlcdserver is somehow using nearly 60MB... |
| 21:36 | <Chutt> | and resolution |
| 21:37 | <clever> | yeah |
| 21:37 | <hads> | I can't remember how long mines been up (probably a few weeks) and mythbackend is using 38MB RES (fixes). |
| 21:37 | <knowledgejunkie> | I'm using MythCenter-Wide @720x576 |
| 21:38 | <clever> | project greyhem 1024x768 |
| 21:38 | <knowledgejunkie> | As my recording schedule is empty for tomorrow - I'll give valgrind a whirl and see if it throws anything up |
| 21:38 | <clever> | ive lowered my res before to be closer to sdtv(less downscaling for the card) |
| 21:39 | <clever> | but then the aspect ratio of many windows was weird |
| 21:39 | <Chutt> | root 13821 3.4 22.4 332972 217936 pts/2 SLl+ Jun24 146:46 mythfrontend |
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| 21:39 | <Chutt> | (1080p, mepo-wide) |
| 21:39 | <danielk22> | re: mythlcdserver, you are probably counting the 61 libs which are shared by a number of programs on your machine. |
| 21:39 | <clever> | knowledgejunkie: with a hardware encoder, you can probly valgrind as you record |
| 21:39 | <knowledgejunkie> | checking top, i'm currently using about 8% swap |
| 21:39 | <clever> | 5% cpu*10 is still only 50% |
| 21:40 | <knowledgejunkie> | my capture devices are either DVB-{S,T} or ivtv |
| 21:40 | <clever> | danielk22: yeah trying to track down every page of ram gets complex when you add shared |
| 21:40 | <Chutt> | i wouldn't be surprised if there's a leak in, say, the upnp code |
| 21:40 | <clever> | and even worse when you add copy on write |
| 21:40 | <clever> | i sometimes run the oom script(2nd) from http://www.linuxdevcenter.com/pub/a/linux/2006/11/30/linux-out-of-memory.html |
| 21:41 | <Chutt> | random stuff on the network hits that fairly often |
| 21:41 | <clever> | to flush stale data into swap |
| 21:41 | <knowledgejunkie> | renato: mythlcdserver - 31452 mythtv 15 0 57724 13m 10m S 0.0 1.4 0:17.08 mythlcdserver |
| 21:41 | <Chutt> | which would make stuff grow randomly if it were leaking |
| 21:41 | <clever> | Chutt: my upnp code randomly gets stuck calling the same syscall in a inf loop |
| 21:41 | <danielk22> | for me with full debugging symbols mythlcdserver uses 3480k |
| 21:41 | <clever> | causing massive system cpu usage |
| 21:41 | <Chutt> | clever, that's been fixed in trunk, iirc |
| 21:42 | <clever> | Chutt: people keep telling me that:P |
| 21:42 | <Chutt> | ah |
| 21:42 | <Chutt> | heh |
| 21:42 | <Chutt> | actually, i thought that was fixed pre 21 |
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| 21:42 | <clever> | finding --version |
| 21:42 | <clever> | MythTV Version : 17442M |
| 21:42 | <clever> | MythTV Branch : trunk |
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| 21:42 | <clever> | qt4 |
| 21:42 | <Chutt> | funky |
| 21:42 | <clever> | yea |
| 21:43 | <Chutt> | i haven't seen it, and i use upnp all the time |
| 21:43 | <clever> | i never even touch upnp and it happens:P |
| 21:43 | <clever> | but it tends to take a few months |
| 21:43 | <Chutt> | vista supports playing back from it nicely =) |
| 21:43 | <clever> | i tracked it down perfectly last time |
| 21:43 | <clever> | a certain function was claiming bytes are ready to be read(select i think) |
| 21:44 | <Chutt> | yeah |
| 21:44 | <Chutt> | and they weren't |
| 21:44 | <clever> | then it would use an ioctl to count them(0 bytes left) |
| 21:44 | <Chutt> | so it was looping |
| 21:44 | <clever> | so it went back to select |
| 21:44 | <clever> | and acording to netstat the socket was closing |
| 21:44 | <Chutt> | tight loop, no way to exit it |
| 21:44 | <Chutt> | 100% cpu |
| 21:44 | <clever> | so a simple read() in nonblocking mode, would cause it to read 0 and know its closed |
| 21:44 | <clever> | blocking mode i mean |
| 21:44 | <clever> | but the code is designed in a nonblocking way |
| 21:44 | <clever> | and isnt checking that its actualy closed when theres 0 left |
| 21:45 | <clever> | i suspect if i hangup the upnp conn without warning i could trigger it |
| 21:45 | <clever> | and mythtv may be doing just that with it freq timeouts(damn slow hardware) |
| 21:47 | <Cardoe> | this place is now jumpin |
| 21:47 | <clever> | wee |
| 21:47 | <clever> | core dump |
| 21:48 | <clever> | with a simple typo |
| 21:48 | <clever> | http://192.168.1.60:6543 |
| 21:49 | <knowledgejunkie> | clever: thanks so much for the memory pointers (no pun intended :) ) |
| 21:50 | <clever> | lol |
| 21:51 | <clever> | #0 0xb5879922 in QString::fromLatin1_helper (str=0x19f <Address 0x19f out of bounds>, size=-1) at tools/qstring.cpp:3165 |
| 21:51 | <clever> | its trying to use a QString at 0x19f |
| 21:51 | <Chutt> | heh |
| 21:51 | <clever> | #2 0x0807956f in QString (this=0xae0f7f40, ch=0x19f <Address 0x19f out of bounds>) at /usr/include/qt4/QtCore/qstring.h:371 |
| 21:52 | <clever> | #3 0xb6bca200 in MythSocket::readStringList (this=0xac59cb70, list=@0xae0f8190, quickTimeout=false) at mythsocket.cpp:491 |
| 21:53 | <clever> | #4 0x080c3fb1 in MainServer::ProcessRequestWork (this=0xb190fa00, sock=0xac59cb70) at mainserver.cpp:301 |
| 21:53 | <Chutt> | is that a VERBOSE call in your tree? |
| 21:53 | <clever> | noe in this backtrace:P |
| 21:53 | <Chutt> | no, mythsocket.cpp:491 |
| 21:53 | <clever> | ah |
| 21:54 | <clever> | yes |
| 21:54 | <Chutt> | that's rather odd. |
| 21:55 | <clever> | how do i show local variables? |
| 21:55 | <Chutt> | in gdb? |
| 21:55 | <clever> | yep |
| 21:55 | <Chutt> | um |
| 21:55 | <danielk22> | chutt: the cast of a QString to (const char*) is not safe |
| 21:55 | <Chutt> | it's been like 2 years since i've used gdb |
| 21:55 | <clever> | lol |
| 21:56 | <Chutt> | danielk22, aaah |
| 21:56 | <clever> | i'll just bt full |
| 21:56 | <Chutt> | i thought there were warnings for that? |
| 21:56 | <danielk22> | from the Qt4 docs: <<<Note: All the functions in this class are reentrant, except ascii(), latin1(), utf8(), and local8Bit().>>> |
| 21:56 | <clever> | and how often do you pay attention to the 3 compiler warnings in the 2000 lines of compiler output? |
| 21:56 | <Chutt> | clever, fairly often |
| 21:56 | <danielk22> | nah, warnings are for the weak :) |
| 21:57 | <danielk22> | clever: make >/dev/null |
| 21:57 | <clever> | lol |
| 21:57 | <danielk22> | clever: so only the errors & warnings show up... |
| 21:57 | <clever> | ah |
| 21:57 | <clever> | but id need to make clean first |
| 21:57 | <danielk22> | yup |
| 21:57 | <Cardoe> | danielk22: make > /dev/null ftw |
| 21:58 | <danielk22> | but this works with ccache :) |
| 21:58 | <clever> | not exactly |
| 21:58 | <clever> | the libupnp wants to run a svnversion on the entire tree |
| 21:58 | <clever> | which takes 5mins out of every single cimpile |
| 21:58 | <clever> | even if nothing ever changed |
| 21:59 | <clever> | ccache wont make it instant |
| 21:59 | <danielk22> | clever: I can't help that, it doesn't take that long on my machine, but it does slow things down.. |
| 21:59 | <clever> | the system holding the recordings has never been fast at disk |
| 21:59 | <clever> | for some weird reason |
| 21:59 | <clever> | and source |
| 21:59 | <Chutt> | probably not a good place to record to :p |
| 21:59 | <clever> | source&recordings&bin&lib are all on a single nfs mount |
| 22:00 | <clever> | source is in /media/mainlv/sharedbuilds/7.10/mythtv/ |
| 22:00 | <clever> | configure has --prefix= /media/mainlv/root/7.10/ |
| 22:00 | <clever> | recordings to /media/mainlv/mythtv/ |
| 22:01 | <clever> | and /media/mainlv/ is the mount point |
| 22:09 | <Cardoe> | Lemme give you a tip.. don't upgrade to gcc 4.3 |
| 22:09 | <Cardoe> | I can't build it on 2G of RAM and 2G of swap |
| 22:09 | <clever> | gcc version 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2) |
| 22:09 | <clever> | tv_play is a pain to build as it is |
| 22:15 | <Chutt> | need to reduce includes |
| 22:17 | <clever> | -rw-r--r-- 1 mythtv mythtv 260K 2008-06-25 16:15 /media/mainlv/sharedbuilds/7.10/mythtv/libs/libmythtv/tv_play.cpp |
| 22:17 | <clever> | its 8752 lines long |
| 22:17 | <clever> | by itself |
| 22:17 | <clever> | before includes |
| 22:17 | <Chutt> | that's really not much |
| 22:17 | <clever> | i think it needs to go on a diet:P |
| 22:17 | <Chutt> | it's the massive number of files that get included that's the problem |
| 22:18 | <Chutt> | well, files that include other files, etc |
| 22:19 | <clever> | -M away! |
| 22:20 | <clever> | or just grep it out of the existing makefile |
| 22:20 | <clever> | its half a screen long |
| 22:22 | <danielk22> | I find the files with lots of strings like dbcheck.cpp & iso639.cpp take a long time to compile.. |
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| 23:32 | <clever> | knowledgejunkie: overcommit-accounting also has a ton of info i just found(in kernel docs) |
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| --- | Log | closed Sat Jun 28 00:00:11 2008 |