Creating Managed Shared Memory using Boost Interprocess takes long time

Question

I am using the Boost.Interprocess library on an Intel i7 processor with Windows Embedded 7 64bit operating system. I have successfully created 2 managed shared memories about 400 Megabytes size, from 2 different processes. When I try to create a 1 Gigabyte managed shared memory from a third process, it takes more than 5 minutes. There is plenty of free space in the drive. The process gets stuck on function:

new managed_shared_memory(open_or_create, name, 1 Gigabyte);

Why is so slow? If I run this process alone, it takes less than 1 second.

And what is your question? An explanation why it is slow or are you looking for an alternative solution? — BluesSolo, Oct 29 '18 at 10:07
or why the process is stuck on the function 'managed_shared_memory'? — Roshan Br, Oct 29 '18 at 10:36

score 0 · Answer 1 · answered Oct 29 '18 at 12:54

When I try to create a 1 Gigabyte managed shared memory from a third process,

Is it using another name? If not, it could be that another process holds a lock. If the other process crashed it might even have abandoned the lock in the held state. See also eg. Boost interprocess mutexes and checking for abandonment

it takes more than 5 minutes. There is plenty of free space in the drive. The process gets stuck on function: managed_shared_memory::managed_shared_memory

Shared memory is memory, not a file. If your system has too little memory to back the virtual realm, you will see a lot of swapping (is the disk very active during the wait? Then this is likely your problem).

If you wanted memory mapped files, use managed_mapped_file. No other changes required.

Creating Managed Shared Memory using Boost Interprocess takes long time

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