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Chevrolet Unveils 200-Mile Bolt EV At Detroit Auto Show

sshir Re:Won't work (426 comments)

Interesting. But (I'm not an expert though) it might be that one cannot mothball those things for very long - you pump it or you lose it.

Additionally, even if it does not work for already producing assets, it as sure as hell will clamp down on new investments. And, maybe, that is just good enough of an outcome.

about two weeks ago
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Chevrolet Unveils 200-Mile Bolt EV At Detroit Auto Show

sshir Re:Only 30 Grand? (426 comments)

Interesting, how many times Saudis will have to spank new drillers so nobody will risk to make large investments into new wells any more. Unless some government intervenes with some kind of minimal price guarantee or something.

about two weeks ago
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Google Throws Microsoft Under Bus, Then Won't Patch Android Flaw

sshir Re:Makes sense. (629 comments)

No, you simply didn't get the point. Google can't push the patch to those devices (unless they are from Nexus line). Samsung, LG, etc. must do the pushing. But they wont.

about two weeks ago
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Chevrolet Unveils 200-Mile Bolt EV At Detroit Auto Show

sshir Re:Auto Dealerships to distribute the Big 3 autos. (426 comments)

You are wrong. They don't want electric vehicles. And that simply because there is no money (or much, much less) in post sale maintenance.

about three weeks ago
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Red Hat Engineer Improves Math Performance of Glibc

sshir Re:excellent (226 comments)

That was my point - this way you eat only one recursive call, not two. And in general case (or naive qsort implementation) one recursive call is enough to burn (on bad input) through all your allowed stack.

about a month ago
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Red Hat Engineer Improves Math Performance of Glibc

sshir Re: Don't need to be an expert to beat compilers . (226 comments)

Interesting. But just as a side note: I thought that people generally stopped rolling their own linear algebra code and started to use precanned one from Intel,amd,nVidia etc. I'm sure matlab is that way.

about a month ago
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Red Hat Engineer Improves Math Performance of Glibc

sshir Re:excellent (226 comments)

On stack size issue - the point was about a case of malicious/pathological input.

about a month ago
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Red Hat Engineer Improves Math Performance of Glibc

sshir Re:excellent (226 comments)

Yes, but they are clever about what and when they put on that stack. In their case it's indeed no more than log base 2 frames (non overlapping intervals with biggest one larger than the rest combined with the "rest" following the same pattern)

about a month ago
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Red Hat Engineer Improves Math Performance of Glibc

sshir Re:excellent (226 comments)

Sure, but that would also mean that debug compiled code, optimized code, ported code - all would behave too differently. Which, again, not a sound engineering practice.

about a month ago
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Red Hat Engineer Improves Math Performance of Glibc

sshir Re:excellent (226 comments)

I would guess that that "custom stack" lives in the heap, so in that case the limitation on program's stack size does not apply.

about a month ago
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Red Hat Engineer Improves Math Performance of Glibc

sshir Re:excellent (226 comments)

Very deterministic. Thus, easy to screw with. Just populate sample points with that worst case pivot value and voilà. Well... it needs to be done for all consecutive rounds so it's not completely trivial but doable.

about a month ago
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Red Hat Engineer Improves Math Performance of Glibc

sshir Re:excellent (226 comments)

If the algorithm is made very unlucky with selection of the pivot, then it will need one stack frame per each 2 data elements. So yeah, I think it's doable (if pivot selection is stupid in some predictable way)

about a month ago
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Red Hat Engineer Improves Math Performance of Glibc

sshir Re:excellent (226 comments)

WTF?! We're talking about general recursion, not some stupid, easily avoidable cases. Even in the case of qsort - you need to make 2 (not one) recursive calls one for left and one for right, and you need to keep the midpoint somewhere on the stack... Basically it's easier to roll your own, totally heap based accounting than try to be clever with stack frames. Plus GP explicitly said that there is recursion and your c compiler does not do tail recursion anyway (or you can't count on it)

about a month ago
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Red Hat Engineer Improves Math Performance of Glibc

sshir Re:excellent (226 comments)

Recursion makes for elegant code, but in production code should be avoided. At least when you have no control of the input data. The reason is that there is a fairly tight restriction on stack size (you have to explicitly tell your OS that you need large stack). As a result you will coredump if your input is the right kind of nasty.

about a month ago
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Many DDR3 Modules Vulnerable To Bit Rot By a Simple Program

sshir Re:good news for ECC memory makers (138 comments)

At least with ECC you'll get _some_ feedback (it's random so it will pop from time to time) indicating that something fishy is going on. With regular ram all corruptions are silent so you'll get random crashes that will drive you crazy...

about a month ago
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Backblaze's 6 TB Hard Drive Face-Off

sshir Re:Long story short (ad-less) (173 comments)

I seriously doubt that difference in load is due to drive speed, at least not directly. Their pods are connected by slow (1Gb?) Ethernet. My guess is that there is a sort of interference effect between disk rotation speed, network data rate, buffer sizes, tcp window size etc.

about a month and a half ago
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Seagate Bulks Up With New 8 Terabyte 'Archive' Hard Drive

sshir Re:Archive? (219 comments)

Oups. Yes, I meant ZFS.

about a month and a half ago
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Seagate Bulks Up With New 8 Terabyte 'Archive' Hard Drive

sshir Re:Archive? (219 comments)

Actually, as somebody pointed out, if you put any modern copy-on-write file system (xfs, btrfs etc.) on that puppy, SMR disk will work just like any other hard drive.

about a month and a half ago
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Seagate Bulks Up With New 8 Terabyte 'Archive' Hard Drive

sshir Re:Archive? (219 comments)

My guess, is that due to the way they write data onto platter, this drive is pretty much useless for random writes (even more so than a regular hard drive). It's good only for huge sequential writes i.e. just bulk storage. Knowing this, they, allegedly, added some long term reliability features and slapped "archival" moniker.

about a month and a half ago
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Seagate Bulks Up With New 8 Terabyte 'Archive' Hard Drive

sshir Fun times (219 comments)

It makes 6TB WD Green way overpriced. Will be fun to watch price action on newegg.

These drives are targeting more or less the same market. And judging by the number of complains, WD's 4 and 6TB drives are not much better in reliability department (although I might be wrong in that regard)

about a month and a half ago

Submissions

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Martin Eberhard Out as Tesla CEO

sshir sshir writes  |  more than 7 years ago

sshir (623215) writes "News on geeks favorite (at the moment) car: Tesla Motors CEO Martin Eberhard has been replaced.
It seems that electric car is more car than computer. Or development CEOs have skill sets incompatible with needs of companies in production stage."

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