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The disk exerciser programs provide a method for
comparing the performance of different disks. For example, how do
disks compare when writing one large file or when writing many
small files. On completion, each test program displays the
program name and the time it took to run, except for TEST11 which
displays a 'Figure of Merit'( = bytes/second).
This performance comparison test package consists of 13
programs. Not all the programs can be run on all disks due to size
constraints.
350 blocks minimum available disk space
Run test programs TEST1 thru TEST5 and TEST11
600 blocks minimum available disk space
Run test programs TEST1 thru TEST7 and TEST11
5500 blocks minimum available disk space
Run test programs TEST1 thru TEST11, including
SPACE2 where indicated
18000 blocks minimum available disk space
Run test programs TEST1 thru TEST11, including
SPACE2 and SPACE8 where indicated
TEST12 AND TEST13 REQUIRE 24,000 BLOCKS TO RUN!!!
See DSKTST.INS for complete instructions.
The programs are written with the assumption that you will
exercise a EMPTY volume that has been initialized using the maximum
number of segments for that type of device. (i.e. for an RX02,
INIT/SEG:13)
The files written by these programs have file names of the
form Nnnn. There are no file extensions. (i.e. N1.,N300.)
Obviously then, 'DEL/NOQ dev:N*.' will delete all these files from
the specified device.
In programs TEST1 thru TEST10, if a file cannot be opened
for any reason, the program will exit. The message 'ERROR IN
OPENING FILE. PROGRAM ABORTED.' will appear. Check the directory
size, space on the disk, etc. to determine the problem. In
TEST11, if the channel cannot be opened, the message 'TILT !!!'
will appear.
Test programs TEST1, TEST2, TEST3, TEST4, and TEST5 were
designed with VM in mind and are useful for normalizing
purposes. They can be used for comparing CPU speeds and memory
speeds in general terms.
The tests will be run on the device you assign XX0:.
In order to use SPACE2.COM and SPACE8.COM, you will need
an auxillary volume of at least 250 blocks to assign XX2:.
The run times are NOT, generally, a function of the device
the system is on but most of the published data was run from RX02.
NOTES FOR THOSE WHO ONLY HAVE RX01 FLOPPY DISKS
If you are testing an RX01 with the system booted on the
other drive, there is only sufficient space on the system disk
for 2 or 3 of the TESTn.SAV files at a time.
Obviously, it will be necessary for you to copy the
required TESTn.SAV files to the system disk between tests.
GENERAL WARNING
THESE PROGRAMS HAVE BEEN RUN SUCCESSFULLY ON A WIDE VARIETY OF
PDP-11 SYSTEMS AND ON A WIDE VARIETY OF CONTROLLERS AND DISKS.
IF YOU FOLLOW THE INSTRUCTIONS AND SOMETHING ABORTS, YOU SHOULD
ASSUME YOU HAVE MADE A MISTAKE OR YOU HAVE HARDWARE PROBLEMS!
FIRMWARE REVS AND BAD MSCP EMULATIONS HAVE BEEN REAL PROBLEMS.