| Monday, January 7th, 2019, 00:53 UTC | ||
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| [08:47:41] | stuarta: | Steve-Goodey: time to have a look at the uptime stats before i ruin them. 100% uptime for the last week. 99.990% for the last 30 days |
| [08:50:18] | Steve-Goodey: | stuarta: lol. Go for it. |
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| [08:57:11] | stuarta: | damn it. osuosl-- can't see the console of the VM anymore. blind upgrade time |
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| [09:27:56] | Mode for #mythtv by ChanServ!ChanServ@services. : +v MythLogBot | |
| [09:27:56] | MythNotifyBot_: | Service: HTTP Smolt is Up – HTTP 200 – OK |
| [09:27:56] | MythNotifyBot_: | Service: HTTP Website is Up – HTTP 200 – OK |
| [09:27:56] | stuarta: | \o/ |
| [09:28:10] | MythNotifyBot_: | Service: HTTP Wiki is Up – HTTP 200 – OK |
| [09:28:11] | MythNotifyBot_: | Service: HTTP ircLog is Up – HTTP 200 – OK |
| [09:28:37] | MythNotifyBot_: | Service: HTTP SSO is Up – HTTP 200 – OK |
| [09:28:59] | stuarta: | \o/ |
| [09:31:53] | MythNotifyBot_: | Service: HTTP Trac is Up – HTTP 200 – OK |
| [10:07:40] | stuarta: | hmpf, they updated buildbot in f28 to 1.6 from 1.1 while i wasn't looking :-/ |
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| [10:52:25] | MythNotifyBot_: | Service: HTTP Buildbot is Up – HTTP 200 – OK |
| [10:55:51] | stuarta: | no that is the wrong bot name |
| [10:55:53] | ** stuarta sighs ** | |
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| [10:57:46] | MythNotifyBot_: | Service: HTTP Buildbot is Down – HTTP 502 – Bad Gateway |
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| [10:58:46] | MythNotifyBot_: | Service: HTTP Buildbot is Up – HTTP 200 – OK |
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| [11:08:30] | MythBuild: | Build 29-osx-master-64bit #2 is complete: Exception [exception update (exception)] – https://code.mythtv.org/buildbot/#builders/13/builds/2 |
| [11:08:30] | ** MythLogBot https://code.mythtv.org/trac/ticket/2 ** | |
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| [11:20:29] | stuarta: | hmpf why can i not see the buildbot webui.... ? |
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| [11:21:34] | paul-h: | stuarta: anyone mention the forum is showing many php errors |
| [11:21:39] | paul-h: | [phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1275: count(): Parameter must be an array or an object that implements Countable |
| [11:21:45] | stuarta: | paul-h: not surprise, i just upgraded the host |
| [11:22:02] | stuarta: | dunno why it's throwing debug tho |
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| [12:15:14] | stuarta: | paul-h: looks to be a lot simpler fix than expected. just dropped the upgrade on the test server and it went through no problems. |
| [12:15:23] | stuarta: | just prepping the same update on mizar |
| [12:18:18] | stuarta: | paul-h: fixed |
| [12:22:17] | stuarta: | grumble, new buildbot needs an even less restrictive CSP than before :( |
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| [12:32:55] | paul-h: | stuarta: looks good thanks |
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| [12:51:21] | hampton: | progress. my osx compile completes :-) but fails to run :-( |
| [12:51:42] | hampton: | FATAL: Unable to load the QT mysql driver, is it installed? |
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| [13:19:32] | stuarta: | hampton: we need to get your f29 buildbot worker setup properly |
| [13:19:40] | hampton: | sure |
| [13:20:30] | stuarta: | it's throwing unauthorized errors, i've copied the passwd from you f28 worker |
| [13:20:35] | stuarta: | so try that |
| [13:22:07] | stuarta: | hampton: you can also now use the latest buildbot worker packages as shipped by the distro |
| [13:23:08] | hampton: | how do I restart the buildbot? |
| [13:23:20] | stuarta: | the slave? stop and start |
| [13:23:34] | stuarta: | or do you mean the master? |
| [13:23:39] | hampton: | the slave |
| [13:23:53] | stuarta: | buildbot-worker stop, buildbot-worker start |
| [13:24:52] | stuarta: | \o/ attached |
| [13:25:13] | stuarta: | it'll trigger on the next push |
| [13:25:25] | stuarta: | there currently isn't a force option via irc or webui |
| [13:41:20] | ** stuarta makes a note to wrap buildmaster in a systemd unit file ** | |
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| [14:49:05] | MythNotifyBot_: | Service: HTTP Buildbot is Down – HTTP 502 – Bad Gateway |
| [14:49:22] | stuarta: | yes yes, i know, fixing the unit file |
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| [14:50:05] | MythNotifyBot_: | Service: HTTP Buildbot is Up – HTTP 200 – OK |
| [14:50:37] | stuarta: | hampton: build master now has a proper systemd unit file and should be stopped and started using that |
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| [18:37:19] | mark____: | anyone have any experience/understanding of maximising precision with floats? trying to understand if this glsl extract can be improved for better precision on low precision GPUs(16bit floats) |
| [18:37:25] | mark____: | if (fract(v_texcoord0.x * 512.00000000) < 0.5) |
| [18:37:41] | mark____: | where x is in the range 0.0 to say 1.0 |
| [18:38:27] | mark____: | do i lose precision by multiplying a very small number by a relatively large one? gut feeling says yes... |
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| [18:49:27] | peper03: | mark____: No extensive experience but just from a computational point of view, I would have thought "if (fract(v_texcoord0.x) < (0.5/512))" would be more efficient since it replaces a run-time multiplication with a compile-time division |
| [18:49:56] | peper03: | (unless the compiler is already clever enough to spot that itself) |
| [18:51:25] | mark____: | peper03: that's my next step – though that extract currently works off the 'fract' inbuilt – so it currently needs to be 0.5 – if you follow. |
| [18:51:57] | mark____: | i.e. the 512 is scaling the value up |
| [18:53:38] | peper03: | Yes, but if the scaled up value is < 0.5, the original value must be < (0.5/512), mustn't it? |
| [18:54:27] | peper03: | And if I understand this page correctly (https://blogs.mathworks.com/cleve/2017/05/08/ . . . rithmetic/), 16-bit floats have a precision of 0.00097656, which co-incidentally (or maybe also not) is 0.5/512 |
| [18:55:12] | peper03: | So I'm not sure whether that 'if' is ever going to be effective. |
| [18:55:38] | peper03: | But as I said, I'm not an expert. Very possible I've missed something. |
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| [19:12:48] | peper03: | OK, reading a bit more seems like it's not quite as simple as that (there's a surprise!) but I think you are right about potentially losing precision by multiplying a small number by a large one. |
| [19:14:17] | peper03: | I still think that comparing the fractional part against 0.5/512 would be computationally quicker and should certainly be less likely to be the cause of precision issues. |
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| [20:45:20] | mark____: | peper03: useful link. the snippet is trying to decide whether the fragment sits in an odd or even column. The addressing is in the range 0.0 to 1.0 – so if the video texture is 1024pixels wide – the column width is 0.00097. it's an adaptation of the rectangular texture version – where a column is 1 wide:) – no precision issues. |
| [20:48:07] | mark____: | gets worse if the video is say 1080 wide – as that requires a texture 2048pixels wide – so column width is 0.000488. and notional precision for 16bit float is 0.00097656 |
| [20:49:42] | mark____: | notional smallest number is 0.00006 – but can't seem to see whether that is actually available. |
| [20:54:13] | peper03: | mark____: https://en.wikipedia.org/wiki/Half-precision_ . . . ion_examples |
| [20:55:06] | peper03: | It seems the smallest possible number in a 16-bit float is approximately 0.000000059605 |
| [20:57:23] | peper03: | So 0.00006 is certainly possible. |
| [20:58:38] | peper03: | The "precision limitations" section just after that also shows how the precision decreases as the value gets larger. |
| [20:59:55] | peper03: | So by the time you have a value between 0.5 and 1.0, the precision is about 0.000488 |
| [21:00:27] | mark____: | pepero3: yup – think I'll try it out – just use a modulus instead of the scaling up and fract |
| [21:00:48] | peper03: | Scale that up to between 256 and 512 (i.e. x * 512) and the precision has gone down to 0.25 |
| [21:01:53] | peper03: | although – duh – 0.25/512 is 0.000488 so overall you haven't lost anything (or not much) |
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| [21:10:19] | mark____: | peper03: I think the new snippet would look something like: if (fract(x / (2 * col_width)) < 0.5) – e.g. if (fract(0.5 / 0.000976) < 0.5) |
| [21:28:52] | markspieth: | mark____: multiplying a float by 2^N only changes the exponent, no change to the mantissa. so long as the mantissa has >= 10 bits. |
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| [21:31:39] | markspieth: | also the prcision issue is with the iterator when the number gets > 1024 then iteration no longer works as expected. the only way to fix this would be to use 2 input surfaces width split which are iterated individually. |
| [21:33:14] | mark____: | markspieth: so you think I'm wasting my time trying to wrangle out some better precision? |
| [21:33:56] | mark____: | actually – I could emulate it on desktop gles2.0 if i force medium precision... |
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| [23:00:39] | MythNotifyBot_: | Service: HTTP Channel Icon Service is Up – HTTP 200 – OK |
| [23:01:49] | stuarta: | \o/ last thing back up and running |
| [23:03:35] | SteveGoodey: | 39.399% pathetic! :-) |
| [23:03:41] | stuarta: | :-p |
| [23:04:16] | stuarta: | figured it's been broken for so long now, since lyngsat added their anti linking protection that it's of limited use these days |
| [23:04:25] | stuarta: | so i was bumped to the bottom of the list |
| [23:04:29] | stuarta: | *it |
| [23:07:14] | SteveGoodey: | Someone was using it in anger, and getting angry. https://lists.gt.net/mythtv/users/622366 |
| [23:07:55] | stuarta: | i think that comes from the AU grabber |
| [23:09:36] | stuarta: | he'd be getting nothing but html 404 in his images rather than muddled ones |
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