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Operating Systems Linux How does the Operating System handle memory? Post 302894673 by wisecracker on Wednesday 26th of March 2014 04:09:58 PM
Old 03-26-2014
Oooh, if only I knew how to disable the MMU for a single byte read anywhere in contiguous memory on an x86 machine that has an OS up and running...

@Corona688, made me smile, nice and pinched... ;o)

@ Lost in Cyberia, although seriously deep reading at the core it might be worthwhile reading up about an MMU, Memory Management Unit as this controls all aspects memory allocation, paging, VM, 32 to 36 bit address pseudo-memory, etc...
 

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FILE2SM(1)							  ICI executables							FILE2SM(1)

NAME
file2sm - shared-memory linked list data ingestion test program SYNOPSIS
file2sm fileName DESCRIPTION
file2sm stress-tests shared-memory linked list data ingestion by repeatedly writing all text lines of the file named fileName to a shared- memory linked list that is the root object of a PSM partition named "file2sm". After writing each line to the linked list, file2sm gives a semaphore to indicate that the list is now non-empty. This is mainly for the benefit of the complementary test program sm2file(1). The operation of file2sm is cyclical. After copying all text lines of the source file to the linked list, file2sm appends an EOF line to the linked list, containing the text "*** End of the file ***", and prints a brief performance report: Processing I<lineCount> lines per second. Then it reopens the source file and starts appending the file's text lines to the linked list again. EXIT STATUS
0 file2sm has terminated. FILES
No configuration files are needed. ENVIRONMENT
No environment variables apply. DIAGNOSTICS
Can't attach to shared memory Operating system error. Check errtext, correct problem, and rerun. Can't manage shared memory. PSM error. Check for earlier diagnostic messages describing the cause of the error; correct problem and rerun. Can't create shared memory list. smlist error. Check for earlier diagnostic messages describing the cause of the error; correct problem and rerun. Can't create semaphore. ION system error. Check for earlier diagnostic messages describing the cause of the error; correct problem and rerun. Can't open input file Operating system error. Check errtext, correct problem, and rerun. Can't reopen input file Operating system error. Check errtext, correct problem, and rerun. Can't read from input file Operating system error. Check errtext, correct problem, and rerun. Ran out of memory. Nominal behavior. sm2file is not extracting data from the linked list quickly enough to prevent it from growing to consume all memory allocated to the test partition. BUGS
Report bugs to <ion-bugs@korgano.eecs.ohiou.edu> SEE ALSO
sm2file(1), smlist(3), psm(3) perl v5.14.2 2012-05-25 FILE2SM(1)
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