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Felix handte

When future medicine allows people to live past the human body's shelf life, a young woman visits her grandmother in the hospital and is uber test questions to question the value of immortality when you still end up in a box.

ABIE: Thanks so much! We're excited to talk to you. Some of Her Parts was originally born from my experience struggling with chronic illness. You know, when you're diagnosed with something without a cure, you find yourself being asked how much you're willing to give up for your health. The way our current system functions, that sacrifice usually takes the form of outrageous medical bills.

So sure, our medical science is sophisticated enough that you can have a serious illness and live without enormous pain and discomfort, but only at the cost of thousands of dollars every few weeks, and that's with good insurance! It's just an incredible sacrifice that we're asking people to make all the time, and it's deeply dehumanizing. In such a system, we're not treating people, we're treating diseases.

The both of us being lifelong fans of speculative fiction, we found ourselves exploring how to take these issues to their logical extremes, where dehumanization in medicine becomes all but literal. If healthcare in our current society is fixed on the preservation of life at the expense of the person, then what if in the future you could literally sacrifice parts of yourself to live longer? How much of yourself could you give up and yet remain you?

Why should I watch this film? How do personal and universal themes work in your film? ABIE: Obviously Some of Her Parts is deeply personal for me, but in the process of making it, it became clear that the risk of dehumanization in healthcare is a pressing theme in all our lives. How have the script and film evolved over the course of their development?

Re: Dictionary Compression for HTTP (at Facebook)

If Black Mirror often takes a somewhat technophobic position on the dangers posed by our relationship with tech, where technology brings out the worst in people, then I think Some of Her Parts is more a movie about a society lacking in empathy that has brought out the worst in technology. Has the feedback surprised or challenged your point of view?

And certainly some people have expressed those concerns. What are you looking to achieve by having your film more visible on www.

TREVOR: Even as the internet makes distribution of indie and short films more accessible, it can still be a daunting challenge to get your film in front of people.

Every opportunity to talk about our work is a privilege.The xxHash family of hash functions has proven more successful than anticipated. Initially designed as a checksum companion for LZ4, it has found its way into many more projects, requiring vastly different workloads. I was recently summoned to investigate performance for a bloom filter implementation, requiring to generate quickly 64 pseudo-random bits from small inputs of variable length.

XXH64 could fit the bill, but performance on small inputs, never was its priority. This was a very interesting journey, leading to surprising discoveries. The end result of this investigation is XXH3a cross-over inspired by many other great hash algorithms, which proves substantially faster than existing variants of xxHash, across basically all dimensions.

It has proven popular among movie makers for file transfer verification, saving a lot of time thanks to its great speed. The main downside is that XXH64 is limited to bit, which is insufficient when comparing a really large number of files and by large I mean many many million ones. For this reason, a bit variant has often been requested. XXH3 features a wide internal state of bits, which makes it suitable to generate a hash of up to bit.

For the time being, only bit and bit variants are exposed, but a similar recipe can be used for a bit variant if there is any need for it one day. All variant feature same speed, since only the finalization stage is different.

Unfortunately, UMAC features a critical flaw for checksumming, which makes it ignore 4 bytes of input, on average every 16 GB. This might not seem much, and it might even be acceptable if the goal is to generate a bit checksum as in the original paper.

But for checksumming large files with bit or bit fingerprints, this is a big no-no. So the version embedded into XXH3 is modified, to guarantee that all input bytes are necessarily present in the final mix. This makes it a bit slower, but as can be seen in the graphs, it remains plenty fast. Vectorization must be done manually, using intrinsic, as the compiler seems unable to properly auto-vectorize the scalar code path. It may be possible to vectorize additional platforms, though this requires dedicated efforts.

SSE2 is enough to reach substantial speed, which is great because all x64 cpus necessarily support this instruction set. SSE2 is also free of dynamic throttling issues, and is automatically enabled on all x64 compilers. Hence I expect it to be the most common target. On a given code path, compilers can make a difference.

For example, AVX2 vectorization is significantly more effective with clang. Actually, the speed of this variant is so fast that I was wondering if it was faster than my main memory. So I graphed the speed over a variety of input sizes. So is it worth being so fast? In which case, a faster hash may save cpu time, but will not make the checksumming operation faster. On the other hand, there are many use cases where data is neither large nor small, say in the KB range.

This includes many types of record, typical of database workloads. Input data is already in the cache, because it was needed anyway by these other operations. In such a scenario, hashing faster helps to a faster overall run time, as cpu savings are employed by subsequent operations.

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The computing world is massively transitioning to bit, even on mobile.Create your free GitHub account today to subscribe to this repository for new releases and build software alongside 40 million developers.

Cyan released this Aug 20, This is primarily a bugfix release, driven by the bugs found and fixed since LZ4 recent integration into Google's oss-fuzzinitiated by cmeister2. The new capability was put to good use by terrellndramatically expanding the number of scenarios covered by the profile-guided fuzzer. These scenarios were already covered by unguided fuzzers, but a few bugs require a large combinations of factors that unguided fuzzer are unable to produce in a reasonable timeframe.

Cyan released this Apr 23, This is a point release, which main objective is to fix a read out-of-bound issue reported in the decoder of v1. Upgrade from this version is recommended. A few other improvements were also merged during this time frame listed below. A visible user-facing one is the introduction of a new command --liststarted by gabrielstedmanwhich makes it possible to peek at the internals of a. It will provide the block type, checksum information, compressed and decompressed sizes if present.

The command is limited to single-frame files for the time being. Note : this release has an issue when compiling liblz4 dynamic library on Mac OS-X. This issue is fixed in : Cyan released this Apr 16, Warning : this version has a known bug in the decompression function which makes it read a few bytes beyond input limit.

Upgrade to v1. Dave Watson djwatson managed to carefully optimize the LZ4 decompression hot loop, offering substantial speed improvements on x86 and x64 platforms.

Here are some benchmark running on a Core iK, source compiled using gcc v8. Given that decompression speed has always been a strong point of lz4the improvement is quite substantial. The new decoding loop is automatically enabled on x64 and x For other cpu types, since our testing capabilities are more limited, the new decoding loop is disabled by default.

The outcome will vary depending on exact target and build chains. For example, in our limited tests with ARM platforms, we found that benefits vary strongly depending on cpu manufacturer, chip model, and compiler version, making it difficult to offer a "generic" statement.

ARM situation may prove extreme though, due to the proliferation of variants available. Other cpu types may prove easier to assess. These variants reverse the logic, by trying to fit as much input data as possible into a fixed memory budget. This is used for example in WiredTiger and EroFSwhich cram as much data as possible into the size of a physical sector, for improved storage density.

When compressing small inputs, the fixed cost of clearing the compression's internal data structures can become a significant fraction of the compression cost. In v1. This proves especially effective when compressing a lot of small data. But this is the next stage, and is likely to happen in a future release.

Cyan released this Sep 11, Abie has been making movies since he was 8 years old and directed Indiana Jones and the Missing Sock. He founded Rad Rhino with Felix so that the same spirit of adventure could be used to create challenging, transformative, and less explicitly derivative films.

Abie still believes in magic, and movies are the proof. He'd call it all powerful, but he never did find that sock. Felix met Abie in their freshman year of high school in the school production of Ionesco's Rhinoceros. They've been making films together ever since.

Felix also holds a day job as a Software Engineer at Facebook. Yana started developing black and white images in the darkroom eight years ago, then switched over to digital to match her student budget, and has recently returned to embrace her roots in film.

felix handte

Abie Sidell director Abie has been making movies since he was 8 years old and directed Indiana Jones and the Missing Sock. Felix Handte cinematographer Felix met Abie in their freshman year of high school in the school production of Ionesco's Rhinoceros.

Yana Azova photographer Yana started developing black and white images in the darkroom eight years ago, then switched over to digital to match her student budget, and has recently returned to embrace her roots in film. Write to us at team radicalrhinoceros.On the first day of school this September, however, many students already knew their schedules. This was because of a new Web site called thehandtes. The site went up the day before school started and allowed students to look up their teachers and schedules before getting their official schedules in school.

The creator of this Web site is senior Felix Handte. On the first two days after the site went up, Handte estimated that there were about 35, individual searches on the site. The Web site was first proposed on September 7, the day before school started.

On that day, Handte received several emails from his friends with a link to another Web site that was meant only for Stuyvesant teachers who wanted to look at their class lists and make seating charts. The site was supposed to require a name and password in order to view the information, but for some reason, it was not secured.

Handte recognized this limitation, but did not immediately come up with the idea for thehandtes. Handte then put each page in a database program.

A little while later, Handte received a link from a friend to a site that had the name of the class that each teacher taught each period. Students enter their name into the search engine, and the site produces all of the classes in which that name occurs, allowing people to see their classes and find out who else is in them.

By now, there have been oversearches. Also, only 37 people in Stuyvesant have not been searched since two days after school started, which was when Handte started tracking the searches. That started his interest in computers, and he has been playing around with them ever since.

Before creating thehandtes. Although the site has been very successful, after school started, the Web site quickly became out of date.

By the next Monday, the administration had found out about thehandtes. Brooks, who was in charge of the site. This meant that as people made program corrections and their schedules were updated, the schedules on thehandtes.

The site is no longer accurate. Although the information is not as up to date as it could be, Handte would like for the site to remain useful.Pushing a structure onto the stack, or within thread-local storage, are natural capabilities offered by a normal struct. It can be desirable at times. The previously described opaque type is so secret that it has no size, hence is not suitable for such scenario.

felix handte

Fortunately, static opaque types are possible. For safer maintenance, the shell type and the target structure must be kept in sync, by using typically a static assert. It will ensure that the shell type is always large enough to host the target structure.

This check is important to automatically detect future evolution of the target structure. It would combine properties of struct while remaining opaque.

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Unfortunately, the strict aliasing rule gets in the way : we can't manipulate the same memory region from two pointers of different type edit Christer Ericson : for the lifespan of the stored value. That's because the compiler is allowed to make assumptions about pointer value provenance for the benefit of performance. To visualize the issue, I like this simple examplepowered by Godbolt.

It shows that the rule is quite logical : if these pointers have different type, they most likely do not reference the same memory area. It may work, as long as the compiler serializes operations as expected in the code, but there is no guarantee that it will continue to work safely in the future.

A known way to break older programs employing type punning is to recompile them with modern compilers using advanced performance optimizations such as -O3 -lto.

felix handte

With enough inlining, register caching and dead code elimination, one will start to experience strange effects, which can be very hard to debug. This is explained in greater details in this excellent article from Mike Acton.

For an even deeper understanding of what can happen under the hood, you can read this document suggested by Josh Simmons. It demonstrates that there is a lot more to a pointer than just its binary representation.

One line of defense could be disable usage of strict aliasing by the optimizer, with a compilation directive such as fno-strict-aliasing on gcc. Portability is also impacted, since there is no guarantee that this capability will always be available on some different C compiler. It works well in practice, at least in my tests. What is worrying though is that in theory, the compiler is only obliged to guarantee the read in correct order. Not sure if it is reliable to depend on it on long term.

As a consequence, the shell type must not be confused with the target type. The strict aliasing rule makes them non-interchangeable! The trick is to use a 3rd party initializer, to convert the allocated space and return a pointer of appropriate type.

In this example, the static size of thingBody is used to allocate space for thing on the stack. No data is ever read from nor written to thingBody. Compared to a usual public structthe experience is not equivalent. To begin with, the proposed stack allocation is a multi-liner and creates 2 variables : the shell type, and the target pointer.

If that matters, stack allocation could have been made a one liner, hidden behind a macro.Sign In View Cart 0 Help. Share Email Print. McLeod ; Mark P.

Ordway ; John B. Roll Jr. Shectman; Antonin H. Gauron ; Felix Handte; Timothy J. Norton ; Phil Streechon; David Weaver. Add to cart.

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Paper Abstract. Achieving the diffraction limit with the adaptive optics system of the 25m Giant Magellan Telescope will require that the 7 pairs of mirror segments be in phase. Phasing the GMT is made difficult because of the cm gaps between the primary mirror segments. These large gaps result in atmospheric induced phase errors making optical phasing difficult at visible wavelengths. The large gaps between the borosilicate mirror segments also make an edge sensing system prone to thermally induced instability.

We describe an optical method that uses twelve 1. The light from each subaperture is mapped onto a MEMS mirror segment and then a lenslet array which are used to stabilize the atmospherically induced image motion. Centroids for stabilization are measured at nm. The piston error is measured from the fringes visible in each of the 12 stabilized images at 2.

We are constructing a prototype camera to be deployed at the 6. McLeodHarvard-Smithsonian Ctr. OrdwayHarvard-Smithsonian Ctr. United States Antonin H.

Roger Eng, Harvard-Smithsonian Ctr. GauronHarvard-Smithsonian Ctr. NortonHarvard-Smithsonian Ctr. Email or Username. Forgot username?

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Mut Posted on 10:12 pm - Oct 2, 2012

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