@shipilev.bsky.social - Aleksey Shipilëv

07 Sep 2026 15:40 +0000

"Friedrich Merz »zutiefst schockiert« über Ergebnis in Sachsen-Anhalt" -- Mein Gott, man muss über 50 Jahre lang in der IT-Branche tätig sein, um ein solches Maß an Kurzsichtigkeit zu erreichen. Die deutsche Bundesregierung heute, das Symbolbild.

04 Sep 2026 15:44 +0000

Friday funking around with cleaner Shenandoah GC logs, already in JDK mainline. Modern concurrent GCs for the win for both latencies, footprint, and often throughput as well!

28 Aug 2026 07:58 +0000

Me in 2016: Me in 2026:

17 Aug 2026 14:29 +0000

I took a "professional" camera (Canon 5D Mark II with EF 24-70) that "professionals" use and made the photo of my green backyard. As you (CANNOT) SEE, it is all CGI, and "professionals" blatantly lie about their results! It is all blurry, blocky, and no real green in sight!!!

17 Aug 2026 08:21 +0000

Heard you like solar eclipse photos, so here are a few spares: app.astrobin.com/i/d1fewi https://app.astrobin.com/i/d1fewi

16 Aug 2026 20:13 +0000

Finally spent enough local compute to process the partial recording of partial solar eclipse last week. This eclipse is too close to horizon, so you get all the clouds you (don't) want. But you can still pull things out! AstroBin: app.astrobin.com/i/2bu5pi https://app.astrobin.com/i/2bu5pi

15 Aug 2026 11:53 +0000

I have a hypothesis: there must be a large cohort of software developers who dodged the addictive AI development loop that keeps you working late into the night, having already acquired natural immunity by getting sick with -- and recovering from -- Factorio.

14 Aug 2026 07:48 +0000

What do you do when tired after eclipse observations, but still have a clear sky? Feels bad to waste it, so you just point the scope at something that is available through the window. Eagle Nebula, my old friend: app.astrobin.com/i/v43z0z https://app.astrobin.com/i/v43z0z

12 Aug 2026 20:54 +0000

Well, hello there. Sun disk in Hα (normal), Sun prominence at 2h in Hα (huge), Moon in Hα (black), thin clouds near the horizon in Hα (blurry), airplane [seems to check out as Ethiopian cargo plane] with exhaust plume in Hα (clearly visible). I'll remaster it... later.

11 Aug 2026 09:04 +0000

PSA: Under NO circumstances look at the Sun without proper Solar-grade filters. NOT with the naked eyes, NOT with sunglasses, and especially NOT with any lens optics. NOT EVEN WHEN SUN IS AT TOTAL ECLIPSE! You WILL damage your retina, even if temporarily. Warn others near you.

09 Aug 2026 13:16 +0000

I suspect halftone printing was invented by the Universe to render the Milky Way. 250MP Milky Way mosaics from last night takes quite a bit of compute, but ends up nicely showing 400K+ individual stars with some dust in background. Zoom is at AstroBin: app.astrobin.com/i/q3snri

04 Aug 2026 18:26 +0000

You are Altair, the 12th brightest star in the sky. How many stars are around you? Yes. app.astrobin.com/i/htriq8

03 Aug 2026 17:37 +0000

It is one thing to take a hand-held camera or a smart telescope and have a Milky Way shot. It is a whole other experience to have a purpose-built widefield rig and do the Milky Way mosaics! Plate solvers find 300K stars in it! Full: app.astrobin.com/i/z13vp6

01 Aug 2026 08:08 +0000

Current astro mounts are designed to carry and slew 10+ kgs of gear with precision and the speed of several degrees per second. This means so much torque, that they take no prisoners and WILL rip out the USB ports if a cable snags. (This one is pretty cheap to fix, phew.)

30 Jul 2026 19:05 +0000

Made it from the first try with one of the most photogenic summer target: Cygnus Loop, a fairly young supernova remnant. Very bright in Hα and OIII bands, can be done in full Moon, very large so a smaller scope frames it well. Full + specs: app.astrobin.com/i/1lzdiy

25 Jul 2026 06:52 +0000

Bode's Galaxy in 1400mm and Tri-Band filters. Pulls significantly more Hα signal, so more of in-galaxy nebulosity is visible, at the expense of broadband fidelity at periphery. Questionable seeing, target is below 30°, scope needs collimation. Full: app.astrobin.com/i/6f2sk0

24 Jul 2026 18:10 +0000

Having fun with ad-hoc cross-JDK progress comparisons. A lot of work went into baseline JDK. A lot of work went into Shenandoah improvements as well. Not shown here are latency numbers that also go down. This is a common story: JDK updates make numbers go up, I mean down.

23 Jul 2026 16:02 +0000

Hotpatch GC state checks in Shenandoah, yeah! Something that I had in mind for a year or so, and now we have enough scaffolding to actually implement it. This is one satisfying <1 KLOC patch. -- What kind of black magic trickery this is? -- Ha-ha, managed runtimes go brrr.

22 Jul 2026 07:05 +0000

Bode's Galaxy again, this time with EdgeHD 8" at 1400mm FL, in unfavorable seeing. Imaging at that scale is hard, but something can be pulled from the fairly questionable data. Full "res" and specs: app.astrobin.com/i/on00u9

21 Jul 2026 11:37 +0000

Yay, a spiritual successor for Waveform Bufferbloat tests appeared: test.libreqos.com. Fairly sensitive to my router QoS settings, as one can see the latencies are near the floor when QoS is on, and, well... not otherwise.

17 Jul 2026 18:47 +0000

Collecting more data every night, so Bode's and Cigar galaxies reveal more details. It is always fun with larger galaxies that you can pull out the *nebulae* in them. The only higher excitement is catching supernova. Full ongoing project, specs, etc: app.astrobin.com/i/29etw1

17 Jul 2026 14:46 +0000

Only few products hit their brand name perfectly. WO Cat Eyes widefield binoculars is definitely one of those. They effectively increase the light gathering (effective pupil!), allowing one to see many more stars.

11 Jul 2026 07:24 +0000

Better framing of Bode's Galaxy and its neighbors. There are 5 clearly visible galaxies in this shot, but if you look closer and cross-reference with galaxies catalogs, there are 50+ fainter galaxies in the shot. Full + specs: app.astrobin.com/i/xcb4ld

09 Jul 2026 08:12 +0000

Oh no, Bode's and Cigar galaxies are getting closer and closer as I switch to scopes with larger focal length! Full + specs: app.astrobin.com/i/aa58a9

06 Jul 2026 07:43 +0000

Askar SQA55 is just really good; quite a bit better than FRA500. I can see how that is a gateway drug into the rest of SQA series. When >130mm SQAs become reasonably priced (a man can dream), it would be absolute fire. Here is Bode's Galaxy again: app.astrobin.com/i/vioe5g

05 Jul 2026 08:14 +0000

Oh, how I love terrestrial shots through well-corrected telescopes. Seeing perfect water drops on the leaves 25 meters away, nice. (Snatched a second-hand SQA55 + a few accessories for nearly half the price of new.)

04 Jul 2026 06:18 +0000

Oh, yes. Little Bode's Galaxy, we call him. app.astrobin.com?i=38wqki

02 Jul 2026 16:30 +0000

Interesting, most of the higher-performing Lunts are sold out until September here. People must be preparing for total solar eclipse in August. Every other week, I pat myself on the back for getting Lunt 60, and wait for someone to finally get desperate and buy my old PST :P

27 Jun 2026 19:02 +0000

"Living, Breathing, European Heatwave Searing Sun: 1 Hour Hα Timelapse". Higher resolution attempt, now that I have a larger 676MM sensor and better match to Lunt 60. Full size and specs: app.astrobin.com/i/f5to2n

26 Jun 2026 13:30 +0000

YOU GUYS, I think I found what is responsible for this freaking heatwave! It was the Sun all along! There would have been no problems if Sun was not shining, at very least no one would ever complain again. The camera sensor is now at +55°C, I am sure it is fine.