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[03:05:11] <jepler> if just one person in the universe understands lut5 of course it's pcw
[03:05:15] <jepler> /nick lut5
[03:09:25] <jepler> $ python
[03:09:28] <jepler> >>> ~True
[03:09:28] <jepler> -2
[03:09:28] <jepler> WAT
[03:14:18] <skunkworks> jepler: didn't you write that?
[03:15:31] <jepler> skunkworks: well yes
[03:17:32] <skunkworks> heh
[03:18:07] <skunkworks> so I have not been following all the rtai conversations... was it figured that a certain isolcpus works the best?
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[03:19:20] <jepler> skunkworks: yes, and maybe it even makes sense.
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[03:20:07] <jepler> skunkworks: certain AMD CPUs, ever since their technology code-name "bulldozer", share some resources between resource pairs.
[03:20:51] <jepler> skunkworks: so if your realtime code is running on #3, then the best results come with isolcpus=2,3 (the pairs are 0,1 and 2,3)
[03:21:19] <jepler> confusingly, if you just isolate one CPU, it's better to isolate the other one in the pair -- so isolcpus=2 was second best
[03:21:53] <jepler> other differences between linuxcnc latency-test and rtai kern/latency are explained by the fact that they each request different CPUs be used
[03:22:03] <jepler> in the end, I think it is all explained
[03:22:21] <jepler> er, "share some resources between CPU pairs"
[03:23:15] <jepler> goodnight
[03:24:46] <skunkworks> jepler: very cool - thanks
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[03:28:31] <skunkworks> didn't know you could isolate more than one..
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[04:23:57] <seb_kuzminsky> tilde true equals minus two: sounds like a monty python song, so it all makes sense
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[05:42:44] <CaptHindsight> skunkworks:
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?The_Isolcpus_Boot_Parameter_And_GRUB2#Latency_Testing
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[15:38:36] <skunkworks> https://groups.google.com/forum/#!topic/machinekit/To6ivNZpEHU
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[15:44:41] <cradek> skunkworks: it'd be great if someone would try out his gantry hal component
[15:44:59] <cradek> might be a very useful stopgap or permanent solution
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[15:46:37] <skunkworks> right
[15:46:58] <skunkworks> I don't think I have anything that is similar
[15:47:12] <skunkworks> (2 joint on 1 axis)... yet
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[16:05:18] <jepler> at least it has a license on it
https://github.com/machinekit/machinekit/blob/master/src/hal/components/gantry.comp
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[16:07:06] <cradek> thanks for finding it
[16:07:20] <cradek> I see no sign of it handling index homing
[16:07:35] <jepler> there's no provision for adjusting racking
[16:08:01] <cradek> well I don't believe in that - move your switches (or ideally, index)
[16:08:22] <jepler> without "proper" gantry support, whatever exactly that is :-P everything's going to have different trade-offs
[16:09:20] <cradek> I bet this gantry.comp is a fine approach for steppers
[16:09:37] <cradek> ... on light machines (since it stops abruptly)
[16:10:25] <jepler> it bakes in assumptions about homing switch polarity, but that's NBD since everything has software inverts
[16:10:53] <cradek> well that's the same thing motion does
[16:10:58] <jepler> it doesn't support separate positive and negative limit switches
[16:11:08] <jepler> I thought homing had a choice of polarity
[16:11:32] <cradek> oh you mean travel directions?
[16:11:54] <jepler> maybe it's been too long since I set up homing
[16:12:13] <jepler> forget it
[16:12:16] <cradek> I don't understand how it mixes home and limit together
[16:12:27] <CaptHindsight> I finally have Wheezy installed from the hybrid ISO. The install defaults to using the software GPU driver and I just added isolcpus=2,3 to the kernel parameters
[16:13:16] <jepler> cradek: oh it's using a single switch for home & limit
[16:13:25] <jepler> you're home if all joints are home, and you're on limit if any joint is on limit
[16:13:42] <cradek> oh ok
[16:14:16] <jepler> joint.##.home might be more verbosely called .combined-home-and-limit
[16:19:26] <CaptHindsight> is there a way to disable jogging for an axis if another axis is withing a certain range?
[16:19:55] <jepler> CaptHindsight: nothing straightforward and not terrible
[16:20:06] <cradek> why do you want that?
[16:20:10] <jepler> heck, probably nothing that is not both convoluted and terrible
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[16:23:18] <CaptHindsight> it's not for a machine tool, it for more general automation when trying to more idiot proof a system
[16:25:08] <CaptHindsight> it's easy enough with ladder and external logic if the jog buttons are pushbuttons on a panel
[16:30:07] <pcw_home> you need the "range" component :-)
[16:30:48] <pcw_home> or expand the comparator comp to a window comparator
[16:33:19] <cradek> near might be useful
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[16:37:28] <pcw_home> Yeah that makes a window comparator
[16:43:23] <pcw_home> I guess scale <1 disables the scale part
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[17:02:43] <jepler> I really should look before I leap
[17:03:03] <cradek> what did you do?
[17:03:16] <jepler> I had eyeballed these two headers on the odroid that I need to connect to my level-shifting board
[17:03:56] <jepler> I know they're 2mm pitch, and so a nice round distance like 28mm sounds good
[17:04:11] <jepler> today I dug around long enough to get a mechanical drawing of the board, and the answer is: 28.125mm
[17:04:30] <cradek> that figures
[17:04:52] <jepler> (what I had "eyeballed" was a png image at about 7 dots per mm, so this is a 1-pixel error)
[17:05:06] <cradek> who lays out their board in 1/8 mms?
[17:05:27] <pcw_home> the pin will bend 5 mills :-)
[17:06:24] <jepler> anyway, lunchtime
[17:06:36] <pcw_home> shove the 2mm socket sideways when soldering
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[19:30:13] <jepler> oops and I transposed the 2x2 header, despite checking it repeatedly. just two of the SPI signals, easy to adjust for
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[19:31:17] <CaptHindsight> heh, I once did that on a 500+ pin bga
[19:32:05] <jepler> heh
[19:32:14] <jepler> not going to fix that by a little rework
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[20:01:10] <skunkworks_> jepler: you got the boards already?
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[20:16:51] <jepler> skunkworks_: no, just checking the schematic again and again
[20:19:28] <skunkworks_> heh
[20:19:45] <skunkworks_> that is always bad after you pull the trigger...
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[20:58:08] <jepler> it's a metaphor for the human condition
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[22:01:18] <jepler> http://paste.debian.net/plain/115833
[22:01:22] <jepler> with this script you can loadusr -w setlut5 lut5.1=i0^i1 lut5.0="i0 & (i1 ^ i2) & ~i3"
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