In-memory processing is fast and easy to implement, however when the process restarts you lose the dataset, which is large by definition tens to hundreds of gigabytes. Send, write and read objects is a lightspeed process. SlimLib implement something like an MVCC mechanism Multi Value Concurency Control.

Do4Change & Décortex

I practice SCRUM and I am attentive to the practices of the industry DDD, TDD. Besides, the IPC in NFX is done via Glue.

Gabriel Rabhi, dont le père Pierre Rabhi n’a à notre connaissance jamais condamné les prises de positions alors même qu’il semble tirer sa légitimité d’être le «fils de» (il l’indique dans son CV, au même titre que ses études et son parcours professionnel [1]), réalise des vidéos à tonalité complotiste sur la question monétaire [2], sous prétexte de réflexion sur.

SlimLib long term project - Gabriel RABHI / Dev.

28.04.2020 · SlimLib is the result of a decade of searches and practices done by me, Gabriel RABHI, in field of in house data management systems. My background is video game programming , graphical user interface engine and multimedia application development, full stack proprietary web engine for social networks under .Net (Facebook like).

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Chargement... Shotweb engine by Gabriel RABHI (c) 2015-2021

My name is Gabriel RABHI.I’m living in France, in the city of Lyon. I am what we usually describe as an atypical developer. Creator of a video game at 18, Al Unser Jr Arcade Racing (Mindscape Bordeaux, Pearson group at the time), passionate about software & Development, I am a self-taught programmer (Pascal, C, C ++, C #) and something like a “software architect”.Estimated Reading Time: 6 mins.

Gabriel Rabhi. 4 contributions in the last year

Le confusionnisme, une tradition chez les Rabhi? Il y a eu 1 lien malencontreux sur son site. Voir la rubrique « A propos » de son site inter-agir.

Voir ici : Gabriel Rabhi. Voir Gabriel Rabhi fiche Wikipedia. Des exemples ici : colibris. Voir la rubrique « La famille des Colibris » sur le site du mouvement, colibris-lemouvement. Un exemple : pierrerabhi. Ainsi, sans surprise, Pierre Rabhi et les Colibris ne sont pas Ganriel. Voir ici : colibris-lemouvement. Cependant, Pierre Rabhi ne rejette pas le Gabriel Rabhi de grands patrons pour autant, comme le Oculus Reparo le site Gabriel Rabhi.

Voir sa biographie officielle : pierrerabhi. Jacques Sapir, un homme de gauche? July 4, June 25, Personnage discret, December 14, Alors que les blogs et sites confusionnistes se comptent par milliers, Gwbriel uns sortent du Il y a le 1er Reich, le 2e Reich. Ecologie, Monnaie Image de « une » : Gabriel, Pierre et David Rabhi D.

Source : francais. Repost 0. Commenter cet article.

I realized the modeling with Auto Studio Autodesk , with Nurbs level 5 to obtain smooth curved surfaces without breaks. This model do not use a smoothed polygonal modeling technic wich is a lot simpler , but the NURBS web curvs based used by car makers for the final shapes of real cars. This is a huge difference. In this model, you can reshape a basic curv and all the model will rebuild the surfaces taking car of the build history of the entire model.

The rendering is done with Mental Ray under Maya using Global Illumination algorithm. It was connected to an Exchange server to retrieve emails and to the PABX to track telephony calls.

It was running Office for direct mail. It also presents a view of project spaces in the form of mind maps. It is a GED Electronic Document Management System.

It contains a simple Gantt board. At the core of the system is a hierarchy of objects that is viewable as a Hiearchy like a file system , a Gantt planning to add delay information to entities or a Mind Map to organize the same entity in a logical way. With associates, we try to make it a real business. We were not aligned, and we failed to go forward in the company foundation. The product needs maintenance and we where unable to resolve major problems. Between and , I was project manager on a proprietary data management technology.

The goal was to make a distribution of data between several places by internet, in real time. The system was a RAD oriented development system too. The system was a complete database management system, with replication and management of the integrated schema update.

The database was composed of objects and worked in RAM with a replicated in-house storage technology. In-Memory processing permit fast execution of linq queries.

If an object was modified on a client connected to one replicated server, the clients viewing the same object sees the changes appearing in real-time on their screens : all this was transparent from the developer point of view. In reality, it was a full real-time distributed and synced objects system.

All was written from scratch with Aurelien Boudoux. It was a really big challenge, with fine grained engineering works. All the architecture was component oriented with a full featured pipeline messaging system. A pipeline can have a network transmitter to transport messages from one machine to another. We can move components from one machine to another. Various components where developed : caching, log, debug, data store, logical.

All exceptions where managed in a client-server paradigm. A catched exception on a node where sended to the caller, on another machine. The core business of this company was not to develop advanced distributed systems, but one specialized LOB system.

The code remains entirely on me, and it was too risky and cost too much to continue. This tool is used for marketing and support tasks : find hot products, classify customers, billing, price targets, manage delivery, make stock analysis, etc.

In the web page source code you can read this :. It will be re-written by serious JS programmer soon and redesigned by real Web-Designer too. Still, it work fine!

I put online Do4Change in after a year and a half of development. It is intended for citizens wishing to organize changes in society. It permits to share content texts, videos, images, sounds, pdf, etc , have consultation tools multiple choice, polls , real-time messaging, an advanced block based editor of web pages, groups and sub- groups of users, etc. It allows to evolve all structures and contents in a collective way. It is a multi-tenant system : you can create your own social nework, replace the colors, the logo, the pictures, and activate features one by one.

This basics offer a really scallable in theory and fast in practice system. The ShotWeb engine offer a really large panel of feature : authentication, file management with download barbers ,. This language makes it possible to change the entire presentation of the online system, the script editor being online.

Online, we can edit all of what makes up the pages of the social network. Presented by: Simon Ritter, Deputy CTO. This is different from language-agnostic object models, as proposed by some vendors i. Individually, these objects are invisible to the GC. Why would anyone use dozens or hundreds of gigabytes of RAM in a first place?

Here are a few tested use-cases of the Big Memory Pile technology. The first thing that comes to mind is cache. In an E-Commerce backend we store hundreds of thousands of products ready to be displayed as detailed catalog listings. Each may have dozens of variations. Why not use Redis or Memcached?

Because we do the same thing only in-process, saving on network traffic and serialization. Transforming data into network packets into objects can be a surprisingly expensive operation. In another cache use-case - a REST API server we were able to pre-serialize around 50 million rarely changing JSON vectors as UTF8-encoded byte arrays. Working with complex object graphs is another perfect case for Pile. In a social app, we needed to traverse the conversation threads on Twitter.

When tracing who said what and when on a social media site, the ability to hold hundreds of millions of small vectors in memory is invaluable.

We might as well have used a graph DB, however in our case we are the graph DB, right in the same process it is a component hosted by our web MVC app. In this, and other use cases, background workers asynchronously update the social graph as changes come in. In many cases, such as the product catalog we talked about earlier, this can be done preemptively.

The key benefit of this approach is its practicality. The real-life cases have shown the phenomenal overall performance while using the native CLR object model - this saves development time because you don't need to create special-purpose DTOs, and works faster , as there are no extra copies in-between that need to be made. In-memory processing is fast and easy to implement, however when the process restarts you lose the dataset, which is large by definition tens to hundreds of gigabytes.

To solve this we added Memory Mapped File MMF support using standard. NET classes: MemoryMappedFile and MemoryMappedViewAccessor. Writing to memory via MemoryMappedViewAccessor MMFMemory class modifies virtual memory pages in the OS layer directly. The OS keeps the pages that have been mapped into process address space around even AFTER the process termination. Upon start, the MMFPile can access the pages already in RAM in a much quicker fashion than reading from disk anew.

Do note that MMFPile yields slower performance than DefaultPile based on byte[] due to the unmanaged code context switch done in the MMFMemory class. As you can see, the MMF solution does have an extra cost; the throughput is lower due to unmanaged MMF transition, and once you mount the Pile back from disk, it takes time proportional to the amount of memory allocated to warm-up the RAM with data from disk.

However you do not need to wait to load the whole working set back, as the MMFPile is instantly available for writes and reads after the Pile. Start , the full load of all data is going to take time, in the example above the 8. Benchmark insert ,, Person class with 7 fields objects 12 threads:. Since our previous post on InfoQ we have made a number of improvements to the NFX. Pile :. The whole serialization mechanism is bypassed for byte[] completely, making it possible to use Pile as just a raw byte[] allocator.

PileEntry struct. In this mode hash code collisions may cause lower priority items to be ejected from the cache even when there is otherwise enough memory. It is now possible to alter objects at the existing PilePointer address. The new API Put PilePointer Deleting the original pointer deletes the link and what it points to. The aliases are completely transparent and yield the target payload on read.

NET Big Memory Object Pile - Use s of millions of objects in RAM. Dmitriy Khmaladze has over 20 years of IT experience in the US. Join a community of over , senior developers. View an example. You need to Register an InfoQ account or Login or login to post comments. Your message is awaiting moderation.

Thank you for participating in the discussion. Do I need to wait until G data loads in memory form file? It is critical for our usage pattern to access this right after process botts. This is kind of exciting. How do you persist an MMFPile and then reload it from disk? My data directory has data stored in it, yet every time I re-run my process, the pile seems to be empty.

Hi, Forest no you do not need to wait for gigabytes to load a whole. This thread may take minutes to load your data. Its ok. Until it does - the new writes will go towards the end of the MMFPile. Hey Dan, thanks for your question. The answer is this: the pile is not empty - it gets "crawled " async by a separate worker, the statistics how many objects, bytes yadayada The MMF files are handled by the OS, so if you try to do a scattered read it will work just fine right after the load.

See the PileForm , run this guy here to see how it works graphically using WinfForms: github. Is the cache expected to persist when using an MMFPile? With LocalCache it is tricky as it is purposed for in-memory use for fast indexing. On shutdown you will lose index, but can keep MMFPile intact. What you can do is reconstruct the cache by enuming through pile after load, which is going to cause some delay. We have yet to release into open source our full cache server that stores keys in the balanced index in MMFPile using version tolerant serializer - the code is used in proprietary system.

A nice feature of memory mapped files is that they are loaded on demand by the OS. Unless you try to iterate through the entire collection, the OS is going to pick up your data from disk one page at a time until it runs out of RAM.

Now lets say your application crashes and restarts. Since the OS already has the file mapped into memory, there is no delay. You're not "copying" the file into your application's memory. Memory mapped files are often used for cross-process communication.

If two applications map the same file to memory, they can see each other's changes. Again, this works because the file is kept in memory at the OS level.

I wonder how two Pile-based applications would handle this. Regarding IPC using MMF as provided by Pile. Besides, the IPC in NFX is done via Glue. There is no practical need to share the memory using Pile for IPC. The long answer: Pile is a memory manager, which is a thread safe state machine. As such, it needs to synchronize the access to segment buffers and free slot pool which are not stored in the MMF.

MMF only stores the actual data kept in Pile, but not the freelists and other metadata. This is done on purpose as syncing this stuff between processes would have been either prohibitive performance-wise or very complex to implement.

Internally we do have a distributed "huge pile" which spans multiple machines, but it is not open as of yet as it is a part of cluster Agni OS. Dmitriy, once you write data to an MMFPile, is the write guaranteed to be persisted? Will data be lost if the machine or application crashes before the data gets flushed from memory to file? There is a a property on MMFPile SyncIntervalMs which writes the "dirty" segments to disk.

HOWEVER I need to merge it in the NFX repository by Monday. Great work, Dmitriy. I'm trying to reconstruct the cache however whenever I try to get the data from the Pile, I get an exception: Bad SLIM format header' Here is the code, the line throwing it is the cache.

Get entry. PutPointer person. Id, entry. Hi Martin, Add the filtering for entry. The enumerator returns all internal "guts", so the Where should help: foreach var entry in cache.

I don't think it can help. I tried to debug and here is what I found: the slim serializer is using the NFX. TypeRegistry class to find out the type for deserialization. To deserialize the data, the SlimeSerializer is trying to first read the type's id from the memory stream and then using this id to get the Type from the TypeRegistry.

However there is no such Type at that time so the exception is thrown. Is there a way to register the types before the TypeRegistry is used so I can be certain of the position? Or am I missing something? Martin, you are not missing anything, and did a fantastic job! This is me missing an improper merge issue which I did not even realize was there.

The MMFPile writes its type registry to a file near the data files.

SlimLib long term project - Gabriel RABHI / Dev.

28.04.2020 · SlimLib is the result of a decade of searches and practices done by me, Gabriel RABHI, in field of in house data management systems. My background is video game programming , graphical user interface engine and multimedia application development, full stack proprietary web engine for social networks under .Net (Facebook like).

Gabriel-RABHI. Gabriel-RABHI / butik.tube My name is Gabriel RABHI. I am what we usually describe as an atypical developer. Creator of a video game at 18, Al Unser Jr Arcade Racing (Mindscape Bordeaux, Pearson group at the time), passionate about software & Development, I am a self-taught programmer (Pascal, C, C ++, C #) and. Gabriel Rabhi is on Facebook. Join Facebook to connect with Gabriel Rabhi and others you may know. Facebook gives people the power to share and makes the world more open and connected. 12/07/ · by Gabriel Rabhi, Your is awaiting moderation. Thank you for participating in the discussion. MMF is a great idea! Good job. You have only to .

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