Hello Are there analogs of Intel Cluster OpenMP? This library simulates shared-memory machine (like SMP or NUMA) while running on distributed memory machine (like Ethernet-connected cluster of PC's). This library allows to start openmp programs directly on cluster. ...
This is driving me wild with frustration. I am just trying to create a shared memory buffer class that uses in shared memory created through Boost.Interprocess where I can read/store data. I wrote the following to test the functionality #include <boost/interprocess/shared_memory_object.hpp> #include <boost/interprocess/mapped_region.hpp...
My problem is quite simple: I have a 400MB file filled with 10,000,000 lines of data. I need to iterate over each line, do something, and remove the line from memory to avoid filling-up too much RAM. Since my machine has several processor, my initial idea to optimize this process was to create two different processes. One would read the...
I found this: http://stackoverflow.com/questions/2284730/fast-interprocess-synchronization-method I used to believe that a pThread mutex can only be shared between two thraeds in the same address space. The question / answers there seems to imply: If I have two separate proceses A & B. They ahve a shared memory region M. I can put a p...
Hi! I would like to have a manager process sharing graphs via shared memory, read-only for other processes which will run various graph algorithms on these graphs. I would like to ask some questions emerged while researching the issue: Are there any graph libraries which are able to operate on (possibly their own) graph structures in r...
Hi there, I am trying to share two different using one shared memory block using the shm.h library. I wrote the following example, where one shared memory block is created and is big enough to hold two integers. I then attach two integers to it and create two processes. The first process increments the first integer. The second process ...
I'm basically searching for a way to pass instances across programs/processes without serializing the instances, in .NET 4.0. Yes, I'm missing my good ol' 100% unsafe pointers ;) I thought the new integration of Memory-mapped files to .NET 4.0 would help me, having read somewhere that you could pass references/pointers "natively" using...
In short, my question is: If you have class, MyClass<T>, how can you change the class definition to support cases where you have MyClass<T, Alloc>, similar to how, say, STL vector provides. I need this functionality to support an allocator for shared memory. Specifically, I am trying to implement a ring buffer in shared memory. Current...
I am being especially dense about this but it seems I'm missing an important, basic point or something, since what I want to do should be common: I need to create a fixed-size ring buffer object from a manager process (Process M). This object has write() and read() methods to write/read from the buffer. The read/write methods will be ca...
I'm pulling my hair due to the following problem: I am following the example given in boost.interprocess documentation to instantiate a fixed-size ring buffer buffer class that I wrote in shared memory. The skeleton constructor for my class is: template<typename ItemType, class Allocator > SharedMemoryBuffer<ItemType, Allocator>::Shared...
I've stared at the Boost.Interprocess documentation for hours but still haven't been able to figure this out. In the doc, they have an example of creating a vector in shared memory like so: //Define an STL compatible allocator of ints that allocates from the managed_shared_memory. //This allocator will allow placing containers in the se...
I am writing a simple wrapper around boost::interprocess's vector container to implement a ring buffer in shared memory (shm) for IPC. Assume that buf is an instance of RingBuffer created in shm. Now, in its ctor, buf itself allocates a private boost::interprocess::vector data member to store values, e.g. m_data. My question is: I think ...
I'm writing a program that for performance reasons uses shared memory (sockets and pipes as alternatives have been evaluated, and they are not fast enough for my task, generally speaking any IPC method that involves copies is too slow). In the shared memory region I am writing many structs of a fixed size. There is one program responsibl...
When using shared memory, each process may mmap the shared region into a different area of its respective address space. This means that when storing pointers within the shared region, you need to store them as offsets of the start of the shared region. Unfortunately, this complicates use of atomic instructions (e.g. if you're trying to ...
I am unable to connect to my local instance of SQL Server 2008 Express using SQL Server Management Studio. I believe the problem is related to a change I made to the connection protocols. Before the error occurred, I had Shared Memory enabled and Named Pipes and TCP/IP disabled. I then enabled both Named Pipes and TCP/IP, and this is wh...
I've written a 'server' program that writes to shared memory, and a client program that reads from the memory. The server has different 'channels' that it can be writing to, which are just different linked lists that it's appending items too. The client is interested in some of the linked lists, and wants to read every node that's added ...
I have a 'server' program that updates many linked lists in shared memory in response to external events. I want client programs to notice an update on any of the lists as quickly as possible (lowest latency). The server marks a linked list's node's state_ as FILLED once its data is filled in and its next pointer has been set to a valid ...
How can I create an apr_table_t type's table in shared memory segment? ...
On Linux I'm using shmget and shmat to setup a shared memory segment that one process will write to and one or more processes will read from. The data that is being shared is a few megabytes in size and when updated is completely rewritten; it's never partially updated. I have my shared memory segment laid out as follows: -------...
Hello, I am writing an Apache module in C++. I need to store the common data that all childs need to read as a portion of shared memory. Structure is kind of map of vectors, so I want to use STL map and vectors for it. I have written a shared allocator and a shared manager for the purpose, they work fine for vectors but not for maps, bel...