@regehr @pervognsen @zwarich Hah, another thing I hacked on in grad school! It would do online perf profiling to discover hot paths in the kernel (geared towards servers running relatively steady, homogeneous workloads), and then recompile a specialized kernel module containing all the code for the path(s) it decided to target with LTO doing hyper-aggressive inlining (including across speculatively devirtualized indirect calls between modules) to provide a single contiguous code path all the way from the syscall entry point down to all the relevant device drivers and then spliced it into the running system as a livepatch.

Had it been a few years or so later it might have seen better results due to the Spectre mitigations that later became necessary slowing down the "before" case more...

@regehr @4raylee It's not much, but in grad school I wrote a benchmarking program that JITted a small sequence of code in order to precisely control both the I-side and D-side cache footprints of the "think time" code executed between issuing syscalls...dusting off the cobwebs: https://gist.github.com/zevweiss/b9da17b661e35c4cabab2cc6e8330df8

@cliffle

If you represent byte sizes as floats I do _not_ want to use your: filesystem, hosting service, network appliance

Okay, that's understandable I suppose, but it makes perfect sense in a programming language interpreter, right?

https://github.com/php/php-src/commit/405a15043f89af7aafdf3975db84059093f0ecdc

re: Uspol

@rk I've had a bookmark of this one pinned to the home screen on my phone for the last year or two, revisiting it not infrequently. It only seems to get more and more vivid.

...and again a year later. It's a good tree!

@arj Even by amdgpu standards that does seem ponderous...did you find a culprit? Curiously, I just did a fetch to my local tree (the first since late May, apparently) and only got about 20% as much:

Receiving objects: 100% (145473/145473), 88.16 MiB | 5.32 MiB/s, done.

@rk I mean, the point is obviously to run as many instances of said text editor simultaneously as possible, right?

@rk Or if you've got sshd listening on a publicly-accessible port, /var/log/btmp. Mine's currently sitting at 726MB.

(I should probably set up some log rotation.)

@chalpin While it's now been over 7 years since I had any even tenuous, tangential involvement with ATE, I still get my daily reminder of it every time I open the dog food bag to get Bowie his dinner.

@kwf Another option is a skirt of sorts to fill in the gap between it and the floor to fend of incoming tennis balls and such (I ended up doing essentially that with our couch a few years ago).

@mattblaze I'm curious -- is that a lighthearted humorous observation of a pattern you see in your photos, or something you've done consciously & intentionally?

@benjojo yeah, that strikes me every time I'm there -- definitely one of the most off-putting aspects of the city, IMO.

@regehr If you're into this kind of heat nerdery and don't already have one, I highly recommend acquiring a thermal camera. Fancy new ones can be kind of pricey, but with a bit of craigslist-watching I snagged a decent-enough used one for <$100 recently.

All sorts of commonplace things are interesting to look at with it, like your "footprints" after walking across a floor barefoot. It's also useful for all sorts of miscellaneous troubleshooting (home, car, electronics...) and taking thoroughly eery photos of your pets.

@shenki Something vaguely along those lines, still sort of figuring it out though...

Decently pleasant view from the office window, with fall foliage colors already beginning to show.

@tj dc(1), or shell functions built thereupon:

$ type rpn rpnf
rpn is a function
rpn () 
{ 
    dc -e "${*//x/*} p"
}
rpnf is a function
rpnf () 
{ 
    rpn 10 k "$@"
}
$ rpnf 329447664 9672 811 x /
42.0000000000

@jk But is the third one a slightly larger lot, or just a worse deal?

@cks @0x0ddc0ffee @drscriptt

In theory I guess you could have the (soft) power switch wired to the BMC as basically a GPIO pin and then the BMC controlling the 'power switch' wired to the PCH or wherever it would go

On the platforms I've developed BMC firmware for that's pretty much exactly how it's arranged. Yes, it's more moving parts between the physical button and actually powering on the host, though often mitigated somewhat by a "GPIO pass-through" feature of popular BMC SoCs (Aspeed parts, at least), wherein you can configure the GPIO controller to basically just bridge two pins together in hardware so there's no software in between and it acts like a direct connection, which can be useful for times when the software that usually manages those GPIOs isn't able to do so for whatever reason (like during the BMC's boot sequence).

Some rocks just don't want to split even after extensive sledgehammering. Fortunately with the right blade a circular saw can make it a little easier.

Also, wow that's by a wide margin the fastest I've ever drained a 4Ah battery (and given that I guess the thermal self-protection shutoff shouldn't have been a surprise).

The verdict: very effective, would rent again (and probably will for the other half of the yard).

@kwf These pictures made me sort of curious about that tool and so I watched a brief video review of it, which happened to mention that the blades are reversible -- perhaps you're already aware, but might they still be intact enough to flip around and keep going?

@dannyjpalmer Oh wow, I hadn't thought about that game in a very long time! And I don't recall ever noticing the tagline on the paper, which is quite excellent.

@mxshift @danderson Can I ask what you used them for? "GHz-capable discrete logic gates" sounds like an interesting space to be in.

@cks @mhoye ...except that's still prone to race conditions, because there's a non-zero (brief, but not entirely negligible) window of time between passing the point of no return on deciding to press a key or click a button and actually doing so, and if the focus-theft happens within that window you're still screwed.

I think what I want is "no program can steal input focus ever, period".

@regehr ...and indeed, after a quick check so do both Seattle & King County public libraries -- DVD and streaming options, even! Nice, libraries for the win.

@regehr @aleksorsist Oh man, I've been wanting to see that for many years, but never have -- and as far as I can tell none of the major streaming services have it available. Maybe I should check the local libraries...