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Writing fast and efficiently - how ?

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Top Forums Programming Writing fast and efficiently - how ?
# 8  
Old 06-10-2002
I would look to the existing problem in a different way. The problem as stated intially is "formulating a faster technique for transfer of data from Shared Memory to a file" .
I would suggest to divide the shared memory into small segments and allow a pair of thread to read/write from each domain, in sync. Hence multiple threads operates on the data together but at mapped memory address. Each thread pointers should be intialized once to the domain bounday (addresses space). Once done a write thread of each process can write to a specific region incrementing a global resource each for itself. Meanwhile a read thread for each data division conditionally waits for the global variable to reach its max or upper domain limit. Once the event is initiated the write thread should conditionally wait for the variable to be initialized to the lower boud limit meanwhile the read thread should write the data to the file. Hence block I/O would be possible , which I think could be faster than the existing.
But however I do take an assumption that the order in which data has to writen to the file is immaterial.
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LEARN ABOUT OPENSOLARIS

mman

mman.h(3HEAD)							      Headers							     mman.h(3HEAD)

NAME

       mman.h, mman - memory management declarations

SYNOPSIS

       #include <sys/mman.h>

DESCRIPTION

       The <sys/mman.h> header supports the following options:

	   o	  the Memory Mapped Files option

	   o	  the Shared Memory Objects option

	   o	  the Process Memory Locking option

	   o	  the Memory Protection option

	   o	  the Synchronized Input and Output option

       For Memory Mapped Files and Shared Memory Objects options, the following protection options are defined:

       PROT_READ     Page can be read.

       PROT_WRITE    Page can be written.

       PROT_EXEC     Page can be executed.

       PROT_NONE     Page cannot be accessed.

       The following flag options are defined:

       MAP_SHARED     Share changes.

       MAP_PRIVATE    Changes are private.

       MAP_FIXED      Interpret addr exactly.

       The flags immediately following are defined for msync(). See msync(3C).

       MS_ASYNC 	Perform asynchronous writes.

       MS_SYNC		Perform synchronous writes.

       MS_INVALIDATE	Invalidate mappings.

       The symbolic constants immediately following are defined for the mlockall() function. See mlockall(3C).

       MCL_CURRENT    Lock currently mapped pages.

       MCL_FUTURE     Lock pages that become mapped.

       The symbolic constant MAP_FAILED is defined to indicate a failure from the mmap() function. See mmap(2).

       The mode_t, off_t, and size_t types are be defined as described in <sys/types.h>. See types(3HEAD).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mmap(2), mprotect(2), munmap(2), madvise(3C), mlock(3C), mlockall(3C), msync(3C), shm_open(3C), shm_unlink(3C), attributes(5), standards(5)

SunOS 5.11							    5 Feb 2008							     mman.h(3HEAD)