Giacomo Mulas wrote:
Hello, I am trying to run a demanding quantum chemistry program on a
cluster
of multiprocessor machines. Each machine has 2 dual-core opterons and
16Gb
of RAM, and is running a 64 bit kernel (currently 2.6.26) and userspace
(lenny) system. Interprocess communications among processes on the same
node go via shared memory (a lot of it), hence I need to set it to the
maximum possible.
The shared memory IPC could also be done thru mmap calls with
appropriate parameters (a real common open file descriptor, MAP_SHARED,
....)
I believe you won't have real size limitation but I would suggest to
have the mmap-ing fit into RAM.
Of course, you have to synchronize your processes using some different
mechanism (pipes, sockets, IPC semaphores semget & semop, Posix
semaphores, ...) or even maybe mutex inside the common shared mmap-ed
memory
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