jbert

46 ms·

271.
by jbert 15y ago
Absolutely agree that you can make more efficient use of resources with threads. I would say that a reasonable rule of thumb is that if your problem/workload is at the point where you want to scale vertically - or you are at all concerned a
272.
by jbert 15y ago
> If I replace my memcache logic with an in-memory thread-safe hashmap, it will always be faster. I can't see how it can be slow. Because in a threaded application context, you have to either: - have locking/synchronization on all data
273.
by jbert 15y ago
> If you subject "out-of-process cacheing technologies" to the same measurements (performance cost, code complexity), as threading solutions, what do you find? Yes, I think you find that shared state is difficult. So it's the old proces
274.
by jbert 15y ago
With most web architectures, your state is outside the process (RDBMS, NoSQL, filesystem, whatever persistent store you're using). So the main benefit using threads (easy sharing of in-process state) goes away. For web architectures, concur
275.
by jbert 15y ago
> A lot uglier, but you can do a one liner ... Yeah, but that one-liner reads the whole file. 'tail' can be more clever (and is). 'strace' output: open("a", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_
276.
by jbert 15y ago
> I meant to say "in general performance", i.e. of a complete application. Micro benchmarks mean less than nothing in that case. Could you give me some info on why you think there isn't a performance edge "these days"? Or are you making
277.
by jbert 15y ago
One data pt - micro benchmark on the default versions of perl/python/ruby on ubuntu 11.04. Sum the numbers up to 10,000,000 using a straight while loop. Run several times on idle system, took representative value. Runtime includes startup t
278.
by jbert 15y ago
It's an interesting question. I would hazard a guess (with nothing really to back me up other than a quick google search and my memory of the data I have seen presented on this subject in the past) that perl has a slight performance edge (c
279.
by jbert 15y ago
You can use a similar setup with: "Just then, one of the group said '42' and everyone chuckled, apart from person explaining [who probably needs an identity for this variant to work], who doubled up in paroxysms of uncontrollable laughter.
280.
by jbert 15y ago
I'm missing something. If the goal of revoking ssh access is to stop kernel devs being able to run arbitrary commands on kernel.org servers...surely you can't give them permissions to set their own commit hooks? If an attacker compromises a
281.
by jbert 15y ago
Yes. As a simple example, if you XORd your input text with a 1-byte key, the letter frequency of english text would be unchanged. So your most common byte in your output would be likely to be the encrypted char 'e'. You could then recover t
282.
by jbert 15y ago
I guess my point was that even if 'Cisco' has corporate-personhood, surely that doesn't cover the people who work there from performing illegal acts? If a Cisco employee murdered someone in the pursuance of Cisco's interests, it would be th
283.
by jbert 15y ago
> One recoils at the thought of it and can only wonder who within Cisco would have countenanced it all. That's the thing. "Cisco" would be hard to hold accountable. But people made those decisions. Was the law broken (false testimony ==
284.
by jbert 15y ago
This has always been my perception. I think that the market forces an underestimation of risk as the only viable long-term strategy (ironically). If I can run my finance house on a "I will blow up on a once-every-5-year event" I will outgro
285.
by jbert 15y ago
My intention was that a single branch could have an unambiguous revno. As pointed out elsewhere in the thread, that requires that branch identity is maintained across a fork+merge, but that seems reasonable to me?
286.
by jbert 15y ago
In that diagram, I see 2 sequences of commits (two branches). The 'original branch' (e.g. "unstable") goes: 0,1,2,5,6 Then there is a topic branch (e.g. "add-frob"), which goes: (0,1),2,3,4,(5). Note that I consider the the 'add-frob' branc
287.
by jbert 15y ago
For a single repository, it does have a very similar interpretation to, say, svn revnos. You can speak of "revision #125 of a branch" in a specific repository. Which is generally exactly what you need for human-to-human communication about
288.
by jbert 15y ago
> That doesn't help: the objects in the DOM are already allocated on the heap. You just want to hold on to them and then drop those references at some point. The idea is to have more than one heap, with different behaviour. Objects in o
289.
by jbert 15y ago
I think it solves the technical problem, I agree that there is an potentially an issue of perception. (Note that the OS won't swap these pages, it will discard them under memory pressure). (Although an argument could be made that any th
290.
by jbert 15y ago
Well, you either serialise/deserialise your data structure to make it memory relative, or you could use mmap(). Allocate such pages with a malloc which works out of an anonymous mmap() backed pool, with madvise(MADV_DONTNEED). The OS will t
291.
by jbert 15y ago
> • There's very often a speed / memory usage tradeoff. At present, especially for web browsers, users tend to prefer speed. (i.e. how many rendered pages do you cache per tab so that clicking the back button is next to instant?) This i
292.
by jbert 15y ago
> I think that humans would have this reaction to the other human species, otherwise why are our horror movies dominated by humanoids, and not by animals? For the same reason that Dr. Who/Star Trek aliens (not all intended to be horrifi
293.
by jbert 15y ago
How are they performing the check? Surely it's subvertable. If you have root - you can provide any information you like to the movie playing application? Or is there a crypto chain of trust in android devices, analagous to the "trusted comp
294.
by jbert 15y ago
When I first read about protocol buffers, I was surprised at the similarity to ASN.1/BER: http://en.wikipedia.org/wiki/Basic_Encoding_Rules Basically, they're both nested type/length/value data formats with primitives for numerics, string
295.
by jbert 15y ago
I don't disagree. But in the spirit of "the perfect is the enemy of the good" if AV/IRV is an improvement over FPTP (which it seems to be) - then is there any downside (in terms of fairness of outcode) to a 'yes' vote in this referendum?
296.
by jbert 15y ago
> This is useful because I cannot remember the emails of all my friends But a mailto: link should pop up your default mail client - which does know your friends email addresses: mailto:?subject=cool%20link&body=Here%20is%20a%20cool%
297.
by jbert 15y ago
Is this useful because of the decline of email (pverty of address books)? Or because of the difficulty in hooking mailto: links to webmail services?
298.
by jbert 16y ago
> The problem is that even a shut-down reactor core generates significant heat due to the decay of fission by-products Ah, thanks. I hadn't appreciated that.
299.
by jbert 16y ago
Out if interest, the way I'd try and design a fail-safe solution would be to have meltdown trigger a shutdown. Picture a bunch of large, heat-proof (ceramic?) test-tubes, with their bases apart but their openings together. Put that undernea
300.
by jbert 16y ago
Sorry for noise - but the phrase 'laser focus' always bugs me. AIUI, lasers aren't focussed (which I would define as: having non-parallel rays converging on a point), they are collimated: http://en.wikipedia.org/wiki/Collimated_light (i.e

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