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Is it allowed to record CommandBuffers on multiple threads which were allocated from the same pool?


Is it allowed to record CommandBuffers on multiple threads which were allocated from the same pool?

By : SoManyProblems
Date : November 20 2020, 11:01 PM
I wish did fix the issue. There is a list of "Implicit Externally Synchronized Parameters" in chapter 2.5. Threading Behavior that has a list mostly consisting of:
The VkCommandPool that commandBuffer was allocated from, in vkCmd*
code :


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multiple threads but only one allowed to use method

multiple threads but only one allowed to use method


By : Johann Berthet
Date : March 29 2020, 07:55 AM
I wish this helpful for you Barriers are a useful synchronization method here.
In pthreads, you can use two barriers, each initialized to a require however many threads are running. The first synchronizes threads after they've finished calculating, and the second after one of them has called X(). Conveniently, the pthread_barrier_wait will elect one and only one of your N waiting threads to actually call X():
code :
void *my_thread(void *whatever) { // XXX error checking omitted
  while (1) {
    int rc;

    do_intense_calculations();

    // Wait for all calculations to finish
    rc = pthread_barrier_wait(&calc_barrier);

    // Am I nominated to run X() ?
    if (rc == PTHREAD_BARRIER_SERIAL_THREAD) X();

    // Wait for everyone, including whoever is doing X()
    rc = pthread_barrier_wait(&x_barrier);
}
How can there be multiple call stacks allocated at the same time? How does the stack pointer change between threads?

How can there be multiple call stacks allocated at the same time? How does the stack pointer change between threads?


By : Alireza baghbanian
Date : March 29 2020, 07:55 AM
This might help you
Do all of the call stacks necessary for an application (if this is even possible to know) get allocated when the application gets launched?
How to manage multiple operations using threads/thread pool?

How to manage multiple operations using threads/thread pool?


By : Tim Legg
Date : March 29 2020, 07:55 AM
Does that help I need to create an application that performs multiple actions in parallel. I was thinking about using threads or thread pool, but I have never worked with this before so I find it quite difficult. The threads should work the following way: , What have you tried? You could make use of parallelism:
code :
Parallel.ForEach(calculations, (currentCalc) => 
{
    // perform calculation
});   
sqlalchemy connection pool on multiple threads

sqlalchemy connection pool on multiple threads


By : Damien Chong
Date : March 29 2020, 07:55 AM
will help you I am not able to add() or add_all() at the session() level. If the engine() is created with additional args, the following works.
It is serializing calls to sqlite3 db tables I believe, which is not ideal but necessary for sqlite.
code :
engine = create_engine('sqlite://', connect_args={'check_same_thread' : False})
conn = engine.connect()

metadata = MetaData(engine)
table = Table('inventory',
              metadata,
              Column('item_no', Integer, primary_key=True, autoincrement=True),
              Column('desc', String(255), nullable=False),
              Column('volume', Integer, nullable=False)
              )

metadata.create_all()

some_inventory = [{'item_no' : 0, 'desc' : 'toy crane', 'volume' : 12},
                  {'item_no' : 1, 'desc' : 'puddle jumper', 'volume' : 2},
                  {'item_no' : 2, 'desc' : 'pet snake', 'volume' : 1},
                  {'item_no' : 3, 'desc' : 'bowling ball', 'volume' : 4},
                  {'item_no' : 4, 'desc' : 'spinning top', 'volume' : 3},
                  {'item_no' : 5, 'desc' : 'pumpkin', 'volume' : 2}]


thread_0 = threading.Thread(target=insert_inventory_table, args=(conn, table, some_inventory[0:3]))
thread_1 = threading.Thread(target=insert_inventory_table, args=(conn, table, some_inventory[3:]))

thread_0.start()
thread_1.start()
Managing a storage pool for multiple threads

Managing a storage pool for multiple threads


By : Christie Park
Date : March 29 2020, 07:55 AM
To fix this issue I have an application which is used read and write data to different storage locations. There is a concept of storage pool that contains multiple storage devices. Only one device can be active at a time for writing content. Intially the first storage device in a pool is considered active. As soon as it gets full or inaccessible, the next device should become active. , How about
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