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mem_stat.txt
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1994-10-16
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The PowerDOS Memory Status Program
(C) 1992 DragonWare Software Inc.
This program is FreeWare ALL RIGHTS RESERVED!
This program is used to show the memory allocation table of PowerDOS.
It runs as a background task, and can be called into service by
holding down both shift keys and the control key. Every second, the
program checks these keys, and if they are all down, the current
memory configuration is written to disk. The pathname for this file
is given as a command line parameter when the program is run. This
file is written in append mode, so multiple runs will result in the
file becoming larger and larger. Also note that if you want the
information written to the screen or printer, just give it a pathname
of con: or prn:. If the output is sent to the screen, the display
will just scroll by unless you halt it with a control-s; control-q
will resume.
Below is a sample output of the program taken while this document was
being prepared:
PowerDOS Memory Status version 1.0
MDB Start Block Owner Owner Owner
Index Address Length PID Name Link
----- -------- -------- ----- -------------- -----
001 174474 105986 -- System 000
002 280460 3908 -- System 001
003 284368 338 -- System 002
004 284706 4 -- System 003
005 284710 2988 -- TSR 004
007 287698 15750 02 Nmon_0 000
008 303448 1022 02 Nmon_0 007
006 304470 2172 02 Nmon_0 008
009 306642 12 02 Nmon_0 006
010 306654 84 -- TSR 005
011 306738 1336 -- TSR 010
012 308074 4550 -- TSR 011
014 312624 8534 -- TSR 012
015 321158 8360 -- TSR 014
016 329518 43286 -- TSR 015
017 372804 6282 -- TSR 016
018 379086 69504 -- TSR 017
019 448590 14 01 GEM_Desktop 000
013 448604 256 01 GEM_Desktop 019
021 448860 14 03 GEM_Desktop 020
020 448874 384 03 GEM_Desktop 000
023 449258 1024 03 GEM_Desktop 021
022 450282 29826 03 GEM_Desktop 023
024 480108 14 03 GEM_Desktop 022
025 480122 2064 03 GEM_Desktop 024
027 482186 2226 03 GEM_Desktop 025
026 484412 14 03 GEM_Desktop 027
028 484426 50992 03 GEM_Desktop 026
030 535418 2226 03 GEM_Desktop 028
029 537644 14 03 GEM_Desktop 030
031 537658 66140 03 GEM_Desktop 029
033 603798 2226 03 GEM_Desktop 031
032 606024 14 03 GEM_Desktop 033
034 606038 49818 03 GEM_Desktop 032
036 655856 2226 03 GEM_Desktop 034
035 658082 14 03 GEM_Desktop 036
037 658096 7984 03 GEM_Desktop 035
039 666080 14 04 MEM_STAT.TTP 074
054 666094 15986 -- Free 000
038 682080 51208 03 GEM_Desktop 037
040 733288 9106 03 GEM_Desktop 038
041 742394 566 03 GEM_Desktop 040
042 742960 566 03 GEM_Desktop 041
043 743526 566 03 GEM_Desktop 042
044 744092 566 03 GEM_Desktop 043
045 744658 566 03 GEM_Desktop 044
046 745224 566 03 GEM_Desktop 045
047 745790 566 03 GEM_Desktop 046
048 746356 566 03 GEM_Desktop 047
049 746922 566 03 GEM_Desktop 048
050 747488 566 03 GEM_Desktop 049
051 748054 566 03 GEM_Desktop 067
069 748620 566 03 GEM_Desktop 051
070 749186 566 03 GEM_Desktop 069
071 749752 566 03 GEM_Desktop 070
072 750318 566 03 GEM_Desktop 071
073 750884 16000 03 GEM_Desktop 068
055 766884 14 05 GENST2.PRG 056
057 766898 308 05 GENST2.PRG 055
058 767206 678 -- Free 000
052 767884 12490 03 GEM_Desktop 050
053 780374 23514 05 GENST2.PRG 057
060 803888 88224 -- Free 000
066 892112 308 03 GEM_Desktop 052
067 892420 89114 03 GEM_Desktop 066
068 981534 195584 03 GEM_Desktop 072
074 1177118 13530 04 MEM_STAT.TTP 000
056 1190648 59560 05 GENST2.PRG 000
059 1250208 500000 05 GENST2.PRG 053
061 1750208 2411328 -- Free 000
Free memory: 2516216
Largest block of free memory: 2411328
Memory used for system resources: 110236
Memory used by TSR programs: 144924
Memory used by programs:
01 GEM_Desktop: 270
02 Nmon_0: 18956
03 GEM_Desktop: 599520
04 MEM_STAT.TTP: 13544
05 GENST2.PRG: 583396
The blocks whose owner is System are memory areas used by PowerDOS
itself. Blocks marked TSR are owned by the system, but came from
programs that used the Terminate-Stay-Resident function call. All
other blocks belong to active processes and are labeled with their
names. (Note that the name is usually the disk file name, but not
always). Also, if you use this program on a TT with alternative ram,
two separate areas will be listed, the one for ST ram, as above, and
one for TT ram. The totals will also reflect the two different kinds
of ram.
The first column heading, MDB, stands for Memory Descriptor Block.
The last column heading contains an owner link (free blocks have no
link). For instance, in the above listing, MEM_STAT.TTP has two
blocks. The first is MDB number 39, and its link is 74. MDB 74 has no
link and so only those two blocks are owned by MEM_STAT.TTP.
The Owner PID column tells you the process ID of the process that
owns the block, if the block is owned by an active process. Note that
in the above examples there are two GEM_Desktop processes. You can't
tell the difference by the name, but the process ID is different (one
and three). (BTW, the reason that there are two desktop processes is
that in recent versions of the TOS roms, the first desktop started by
the system actually launches a second desktop, then waits around for
the second to terminate, which it does when you change resolutions.)