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Shared Memory in Windows
| Shared Memory in Windows [message #48240] |
Tue, 04 April 2006 17:32 |
Robbie
Messages: 165
Registered: February 2006
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Senior Member |
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Just a simple performance question for shared memory in Windows...
I've started aquainting myself with POSIX and SYSV shared memory in
UNIX and I was looking for a Windows equivalent. To my dismay shared
memory appears to be backed in the pagefile. Does that mean that I will
have overhead due to disk IO? Or is the pagefile actually backed in RAM
and only uses pagefile.sys when RAM is exhausted.
------------------------------------------------------------ ------------------------------------------------------------ --------------------------
> From IDLs SHMMAP documentation
Under Microsoft Windows, the CreateFileMapping() system call forms the
basis for shared memory as well as memory mapped files ... To create a
region of anonymous mapped memory instead of a mapped file, you pass a
special file handle (0xffffffff) to CreateFileMapping(). In this case,
the disk space used to back the shared memory is taken from the system
pagefile.
------------------------------------------------------------ ------------------------------------------------------------ --------------------------
> From the MSVC documentation for CreateFileMapping()
.... In this case, CreateFileMapping creates a file mapping object of
the specified size backed by the operating-system paging file rather
than by a named file in the file system.
------------------------------------------------------------ ------------------------------------------------------------ --------------------------
Thanks,
Robbie
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