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90 lines
3.9 KiB
Plaintext
90 lines
3.9 KiB
Plaintext
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MS-DOS PROGRAM PROFILER
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FOR .EXE .COM FILES
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I. PURPOSE
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The PROFIL program is designed to produce an execution
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profile of MS-DOS 1.25 or 2.00 .EXE or .COM files on
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8086/8088 systems which have a programmable interrupting
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clock. The method employed is to chop the program up
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into a sequence of "buckets" and to increment the
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appropriate (based on CS:IP) bucket count when the clock
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interrupts. In addition there are counters for hits
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in the I/O system and the DOS so some idea of how I/O
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or DOS bound a program is. There is also a bucket for
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hits above the program area, you might get counts here
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if your program relocates itself, or goes haywire.
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The PROFIL program is not intended as an end-user
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program, but rather as a developement tool. To this
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end it is not particularly robust or friendly, but gets
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the job done. The OEM must write a PCLOCK routine (see
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PCLOCK.ASM) which implements the hardware dependant clock
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interrupt. The implementation should be evident from
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examining the source code, it is quite simple. There
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is a CLOCKON routine which sets up a clock interrupt
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to the CLK_INTER routine every DX micro seconds. A
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CLOCKOFF routine which un-does CLOCKON. And a LEAVE_INT
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routine which is responsible for the actual "IRET" from
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the clock interrupt. Also see the PROHIST documentation.
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II. USAGE
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The profiler is envoked by uttering:
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PROFIL fname.ext
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where the filename is completly specified, including
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extension. You will then be prompted for the number
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of paragraphs in one bucket. This number must be > 0,
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based on this number the number of buckets is computed
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by using the size of the executable file. Next you will
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be prompted for the clock interval, and lastly for
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parameters to the program. Type the parameters just
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as if you were running the program at the command level.
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NOTE: If a "bad" number is entered for the bucket size
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or clock interval, you will be reprompted.
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When the program terminates, normally or by Cntrl-C,
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PROFIL will print a termination message (similar to
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debug). The output file will be fname.PRF where fname
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is the same as the file containing the program being
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profiled.
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III. OUTPUT FORMAT
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The format of the output file is the following C
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type structure.
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struct profdata {
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short clock_grain; /* Clock sample interval in
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micro-seconds*/
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short bucket_num; /* The total number of buckets */
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short bucket_siz; /* Number of paragraphs per bucket */
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short prog_low_pa; /* The Paragraph number of the lower
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bound on the sample area */
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short prog_high_pa; /* The Paragraph number of the upper
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bound on the sample area */
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short dos_pa; /* The Paragraph number of the I/O DOS
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boundry */
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/* When the clock interrupts the current segment is computed
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from the CS:IP. If this is below dos_pa it is an I/O hit,
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if between dos_pa and prog_low_pa it is a DOS hit, if between
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prog_low_pa and prog_high_pa the appropriate bucket number
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is computed and that bucket count is incremented, if above
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prog_high_pa then it is a high hit. */
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short hit_io; /* I/O bucket */
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short hit_dos; /* DOS bucket */
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short hit_high; /* Above program bucket */
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};
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short buckets[bucket_num];
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/* The buckets *****NOTE: You can't declare it this way
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(bucket_num is a variable), the size of this area is
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determined by the value of bucket_num in the fixed header
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*/
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