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dbug
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analyze.c
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C/C++ Source or Header
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1987-09-06
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/*
* Analyze the profile file (cmon.out) written out by the dbug
* routines with profiling enabled.
*
* Copyright June 1987, Binayak Banerjee
* All rights reserved.
*
* This program may be freely distributed under the same terms and
* conditions as Fred Fish's Dbug package.
*
* Compile with -- cc -O -s -o %s analyze.c
*
* Analyze will read an trace file created by the dbug package
* (when run with traceing enabled). It will then produce a
* summary on standard output listing the name of each traced
* function, the number of times it was called, the percentage
* of total calls, the time spent executing the function, the
* proportion of the total time and the 'importance'. The last
* is a metric which is obtained by multiplying the proportions
* of calls and the proportions of time for each function. The
* greater the importance, the more likely it is that a speedup
* could be obtained by reducing the time taken by that function.
*
* Note that the timing values that you obtain are only rough
* measures. The overhead of the dbug package is included
* within. However, there is no need to link in special profiled
* libraries and the like.
*
* CHANGES:
*
* 24-Jul-87: fnf
* Because I tend to use functions names like
* "ExternalFunctionDoingSomething", I've rearranged the
* printout to put the function name last in each line, so
* long names don't screw up the formatting unless they are
* *very* long and wrap around the screen width...
*
* 24-Jul-87: fnf
* Modified to put out table very similar to Unix profiler
* by default, but also puts out original verbose table
* if invoked with -v flag.
*/
# include <stdio.h>
# include "useful.h"
char *my_name;
int verbose;
/*
* Structure of the stack.
*/
# define PRO_FILE "dbugmon.out" /* Default output file name */
# define STACKSIZ 100 /* Maximum function nesting */
# define MAXPROCS 1000 /* Maximum number of function calls */
struct stack_t {
unsigned int pos; /* which function? */
unsigned long time; /* Time that this was entered */
unsigned long children; /* Time spent in called funcs */
}
fn_stack[STACKSIZ+1];
unsigned int stacktop = 0; /* Lowest stack position is a dummy */
/*
* top() returns a pointer to the top item on the stack.
* (was a function, now a macro)
*/
# define top() &fn_stack[stacktop]
/*
* Push - Push the given record on the stack.
*/
void
push(name_pos,time_entered)
register unsigned int name_pos;
register unsigned long time_entered;
{
register struct stack_t *t;
DBUG_ENTER("push");
if (++stacktop > STACKSIZ)
{
fprintf(DBUG_FILE,"%s: stack overflow (%s:%d)\n",
my_name,__FILE__,__LINE__);
exit(EX_SOFTWARE);
}
DBUG_PRINT("push",("%d %ld",name_pos,time_entered));
t = &fn_stack[stacktop];
t->pos = name_pos;
t->time = time_entered;
t->children = 0;
DBUG_VOID_RETURN;
}
/*
* Pop - pop the top item off the stack, assigning the field values
* to the arguments. Returns 0 on stack underflow, or on popping first
* item off stack.
*/
unsigned int
pop(name_pos, time_entered, child_time)
register unsigned int *name_pos;
register unsigned long *time_entered;
register unsigned long *child_time;
{
register struct stack_t *temp;
DBUG_ENTER("pop");
if (stacktop < 1)
DBUG_RETURN(0);
temp = &fn_stack[stacktop];
*name_pos = temp->pos;
*time_entered = temp->time;
*child_time = temp->children;
DBUG_PRINT("pop",("%d %d %d",*name_pos,*time_entered,*child_time));
DBUG_RETURN(stacktop--);
}
/*
* We keep the function info in another array (serves as a simple
* symbol table)
*/
struct module_t {
char *name;
unsigned long m_time;
unsigned long m_calls;
}
modules[MAXPROCS];
/*
* We keep a binary search tree in order to look up function names
* quickly (and sort them at the end.
*/
struct {
unsigned int lchild; /* Index of left subtree */
unsigned int rchild; /* Index of right subtree */
unsigned int pos; /* Index of module_name entry */
}
s_table[MAXPROCS];
unsigned int n_items = 0; /* No. of items in the array so far */
/*
* Need a function to allocate space for a string and squirrel it away.
*/
char *
strsave(s)
char *s;
{
register char *retval;
register unsigned int len;
extern char *malloc ();
DBUG_ENTER("strsave");
DBUG_PRINT("strsave",("%s",s));
if (s == Nil(char) || (len = strlen(s)) == 0)
DBUG_RETURN(Nil(char));
MALLOC(retval, ++len, char);
strcpy(retval,s);
DBUG_RETURN(retval);
}
/*
* add() - adds m_name to the table (if not already there), and returns
* the index of its location in the table. Checks s_table (which is a
* binary search tree) to see whether or not it should be added.
*/
unsigned int
add(m_name)
char *m_name;
{
register unsigned int ind = 0;
register int cmp;
DBUG_ENTER("add");
if (n_items == 0) /* First item to be added */
{
s_table[0].pos = ind;
s_table[0].lchild = s_table[0].rchild = MAXPROCS;
addit:
modules[n_items].name = strsave(m_name);
modules[n_items].m_time = modules[n_items].m_calls = 0;
DBUG_RETURN(n_items++);
}
while (cmp = strcmp(m_name,modules[ind].name)) {
if (cmp < 0) { /* In left subtree */
if (s_table[ind].lchild == MAXPROCS) {
/* Add as left child */
if (n_items >= MAXPROCS) {
fprintf(DBUG_FILE,
"%s: Too many functions being profiled\n",
my_name);
exit(EX_SOFTWARE);
}
s_table[n_items].pos =
s_table[ind].lchild = n_items;
s_table[n_items].lchild =
s_table[n_items].rchild = MAXPROCS;
# ifdef notdef
modules[n_items].name = strsave(m_name);
modules[n_items].m_time = modules[n_items].m_calls = 0;
DBUG_RETURN(n_items++);
# else
goto addit;
# endif
}
ind = s_table[ind].lchild; /* else traverse l-tree */
} else {
if (s_table[ind].rchild == MAXPROCS) {
/* Add as right child */
if (n_items >= MAXPROCS) {
fprintf(DBUG_FILE,
"%s: Too many functions being profiled\n",
my_name);
exit(EX_SOFTWARE);
}
s_table[n_items].pos =
s_table[ind].rchild = n_items;
s_table[n_items].lchild =
s_table[n_items].rchild = MAXPROCS;
# ifdef notdef
modules[n_items].name = strsave(m_name);
modules[n_items].m_time = modules[n_items].m_calls = 0;
DBUG_RETURN(n_items++);
# else
goto addit;
# endif
}
ind = s_table[ind].rchild; /* else traverse r-tree */
}
}
DBUG_RETURN(ind);
}
unsigned long int tot_time = 0;
unsigned long int tot_calls = 0;
/*
* process() - process the input file, filling in the modules table.
*/
void
process(inf)
FILE *inf;
{
char buf[BUFSIZ];
char fn_name[25]; /* Max length of fn_name */
char fn_what[2];
unsigned long fn_time;
unsigned int pos;
unsigned long time;
unsigned int oldpos;
unsigned long oldtime;
unsigned long oldchild;
struct stack_t *t;
DBUG_ENTER("process");
while (fgets(buf,BUFSIZ,inf) != NULL)
{
sscanf(buf,"%24s %1s %ld", fn_name, fn_what, &fn_time);
pos = add(fn_name);
DBUG_PRINT("enter",("%s %s %d",fn_name,fn_what,fn_time));
if (fn_what[0] == 'E')
push(pos,fn_time);
else {
/*
* An exited function implies that all stacked
* functions are also exited, until the matching
* function is found on the stack.
*/
while( pop(&oldpos, &oldtime, &oldchild) ) {
DBUG_PRINT("popped",("%d %d",oldtime,oldchild));
time = fn_time - oldtime;
t = top();
t -> children += time;
DBUG_PRINT("update",("%s",modules[t->pos].name));
DBUG_PRINT("update",("%d",t->children));
time -= oldchild;
modules[oldpos].m_time += time;
modules[oldpos].m_calls++;
tot_time += time;
tot_calls++;
if (pos == oldpos)
goto next_line; /* Should be a break2 */
}
/*
* Assume that item seen started at time 0.
* (True for function main). But initialize
* it so that it works the next time too.
*/
t = top();
time = fn_time - t->time - t->children;
t->time = fn_time; t->children = 0;
modules[pos].m_time += time;
modules[pos].m_calls++;
tot_time += time;
tot_calls++;
}
next_line:;
}
/*
* Now, we've hit eof. If we still have stuff stacked, then we
* assume that the user called exit, so give everything the exited
* time of fn_time.
*/
while (pop(&oldpos,&oldtime,&oldchild))
{
time = fn_time - oldtime;
t = top();
t->children += time;
time -= oldchild;
modules[oldpos].m_time += time;
modules[oldpos].m_calls++;
tot_time += time;
tot_calls++;
}
DBUG_VOID_RETURN;
}
/*
* out_header() -- print out the header of the report.
*/
void
out_header(outf)
FILE *outf;
{
DBUG_ENTER("out_header");
if (verbose) {
fprintf(outf,"Profile of Execution\n");
fprintf(outf,"Execution times are in milliseconds\n\n");
fprintf(outf," Calls\t\t\t Time\n");
fprintf(outf," -----\t\t\t ----\n");
fprintf(outf,"Times\tPercentage\tTime Spent\tPercentage\n");
fprintf(outf,"Called\tof total\tin Function\tof total Importance\tFunction\n");
fprintf(outf,"======\t==========\t===========\t========== ==========\t========\t\n");
} else {
fprintf(outf," %%time sec #call ms/call %%calls weight name\n");
}
DBUG_VOID_RETURN;
}
/*
* out_trailer() - writes out the summary line of the report.
*/
void
out_trailer(outf,sum_calls,sum_time)
FILE *outf;
unsigned long int sum_calls, sum_time;
{
DBUG_ENTER("out_trailer");
if (verbose) {
fprintf(outf,"======\t==========\t===========\t==========\t========\n");
fprintf(outf,"%6d\t%10.2f\t%11d\t%10.2f\t\t%-15s\n",
sum_calls,100.0,sum_time,100.0,"Totals");
}
DBUG_VOID_RETURN;
}
/*
* out_item() - prints out the output line for a single entry,
* and sets the calls and time fields appropriately.
*/
void
out_item(outf,m,called,timed)
FILE *outf;
register struct module_t *m;
unsigned long int *called, *timed;
{
char *name = m->name;
register unsigned int calls = m->m_calls;
register unsigned long time = m->m_time;
unsigned int import;
double per_time = 0.0;
double per_calls = 0.0;
double ms_per_call, ftime;
DBUG_ENTER("out_item");
if (tot_time > 0) {
per_time = (double) (time * 100) / (double) tot_time;
}
if (tot_calls > 0) {
per_calls = (double) (calls * 100) / (double) tot_calls;
}
import = (unsigned int) (per_time * per_calls);
if (verbose) {
fprintf(outf,"%6d\t%10.2f\t%11d\t%10.2f %10d\t%-15s\n",
calls, per_calls, time, per_time, import, name);
} else {
ms_per_call = time;
ms_per_call /= calls;
ftime = time;
ftime /= 1000;
fprintf(outf,"%8.2f%8.3f%8u%8.3f%8.2f%8u %-s\n",
per_time, ftime, calls, ms_per_call, per_calls, import, name);
}
*called = calls; *timed = time;
DBUG_VOID_RETURN;
}
/*
* out_body(outf,root,s_calls,s_time) -- Performs an inorder traversal
* on the binary search tree (root). Calls out_item to actually print
* the item out.
*/
void
out_body(outf,root,s_calls,s_time)
FILE *outf;
register unsigned int root;
register unsigned long int *s_calls, *s_time;
{
unsigned long int calls, time;
DBUG_ENTER("out_body");
DBUG_PRINT("out_body",("%d,%d",*s_calls,*s_time));
if (root == MAXPROCS) {
DBUG_PRINT("out_body",("%d,%d",*s_calls,*s_time));
DBUG_VOID_RETURN;
}
while (root != MAXPROCS) {
out_body(outf,s_table[root].lchild,s_calls,s_time);
out_item(outf,&modules[s_table[root].pos],&calls,&time);
DBUG_PRINT("out_body",("-- %d -- %d --", calls, time));
*s_calls += calls;
*s_time += time;
root = s_table[root].rchild;
}
DBUG_PRINT("out_body",("%d,%d",*s_calls,*s_time));
DBUG_VOID_RETURN;
}
/*
* output() - print out a nice sorted output report on outf.
*/
void
output(outf)
FILE *outf;
{
unsigned long int sum_calls = 0;
unsigned long int sum_time = 0;
DBUG_ENTER("output");
if (n_items == 0)
{
fprintf(outf,"%s: No functions to trace\n",my_name);
exit(EX_DATAERR);
}
out_header(outf);
out_body(outf,0,&sum_calls,&sum_time);
out_trailer(outf,sum_calls,sum_time);
DBUG_VOID_RETURN;
}
# define usage() fprintf(DBUG_FILE,"Usage: %s [-v] [prof-file]\n",my_name)
main(argc, argv, environ)
int argc;
char *argv[], *environ[];
{
extern int optind, getopt();
extern char *optarg;
register int c;
int badflg = 0;
FILE *infile;
FILE *outfile = {stdout};
DBUG_ENTER("main");
DBUG_PROCESS(argv[0]);
my_name = argv[0];
while ((c = getopt(argc,argv,"#:v")) != EOF)
{
switch (c)
{
case '#': /* Debugging Macro enable */
DBUG_PUSH(optarg);
break;
case 'v': /* Verbose mode */
verbose++;
break;
default:
badflg++;
break;
}
}
if (badflg)
{
usage();
DBUG_RETURN(EX_USAGE);
}
if (optind < argc)
FILEOPEN(infile,argv[optind],"r");
else
FILEOPEN(infile,PRO_FILE,"r");
process(infile);
output(outfile);
DBUG_RETURN(EX_OK);
}