ref: d5e2fd9028687dfc18c0ac1b249ccec38ab075f6
dir: /sys/src/cmd/iostats.c/
/*
* iostats - Gather file system information
*/
#include <u.h>
#include <libc.h>
#include <auth.h>
#include <fcall.h>
#define DONESTR "done"
enum{
Maxfile = 1000, /* number of Files we'll log */
};
typedef struct File File;
typedef struct Fid Fid;
typedef struct Req Req;
typedef struct Rpc Rpc;
typedef struct Stats Stats;
/* per file statistics */
struct File
{
Qid qid;
char *path;
ulong nopen;
ulong nread;
vlong bread;
ulong nwrite;
vlong bwrite;
};
/* fid context */
struct Fid
{
int fid;
Qid qid;
char *path;
File *file; /* set on open/create */
Fid *next;
};
/* a request */
struct Req
{
Req *next;
vlong t;
Fcall f;
uchar buf[];
};
/* per rpc statistics */
struct Rpc
{
char *name;
ulong count;
vlong time;
vlong lo;
vlong hi;
vlong bin;
vlong bout;
};
/* all the statistics */
struct Stats
{
vlong totread;
vlong totwrite;
ulong nrpc;
vlong nproto;
Rpc rpc[Tmax];
File file[Maxfile];
};
Stats stats[1];
int pfd[2];
int efd[2];
int done;
Lock rqlock;
Req *rqhead;
Fid *fidtab[1024];
void
catcher(void *a, char *msg)
{
USED(a);
if(strcmp(msg, DONESTR) == 0) {
done = 1;
noted(NCONT);
}
if(strcmp(msg, "exit") == 0)
exits("exit");
noted(NDFLT);
}
void
update(Rpc *rpc, vlong t)
{
vlong t2;
t2 = nsec();
t = t2 - t;
if(t < 0)
t = 0;
rpc->time += t;
if(t < rpc->lo)
rpc->lo = t;
if(t > rpc->hi)
rpc->hi = t;
}
Fid**
fidhash(int fid)
{
return &fidtab[fid % nelem(fidtab)];
}
Fid*
getfid(int fid, int new)
{
Fid *f, **ff;
ff = fidhash(fid);
for(f = *ff; f != nil; f = f->next){
if(f->fid == fid)
return f;
}
if(new){
f = mallocz(sizeof(*f), 1);
f->fid = fid;
f->next = *ff;
*ff = f;
}
return f;
}
void
setfid(Fid *f, char *path, Qid qid)
{
if(path != f->path){
free(f->path);
f->path = path;
}
f->qid = qid;
f->file = nil;
}
void
rattach(Fcall *fin, Fcall *fout)
{
setfid(getfid(fin->fid, 1), strdup("/"), fout->qid);
}
void
rwalk(Fcall *fin, Fcall *fout)
{
Fid *of, *f;
int i;
if((of = getfid(fin->fid, 0)) == nil)
return;
f = getfid(fin->newfid, 1);
if(f != of)
setfid(f, strdup(of->path), of->qid);
for(i=0; i<fout->nwqid; i++)
setfid(f, cleanname(smprint("%s/%s", f->path, fin->wname[i])), fout->wqid[i]);
}
void
ropen(Fcall *fin, Fcall *fout)
{
File *fs;
Fid *f;
if((f = getfid(fin->fid, 0)) == nil)
return;
if(fin->type == Tcreate)
setfid(f, cleanname(smprint("%s/%s", f->path, fin->name)), fout->qid);
else
setfid(f, f->path, fout->qid);
for(fs = stats->file; fs < &stats->file[Maxfile]; fs++){
if(fs->nopen == 0){
fs->path = strdup(f->path);
fs->qid = f->qid;
f->file = fs;
break;
}
if(fs->qid.path == f->qid.path && strcmp(fs->path, f->path) == 0){
f->file = fs;
break;
}
}
if(f->file != nil)
f->file->nopen++;
}
void
rclunk(Fcall *fin)
{
Fid **ff, *f;
for(ff = fidhash(fin->fid); (f = *ff) != nil; ff = &f->next){
if(f->fid == fin->fid){
*ff = f->next;
free(f->path);
free(f);
return;
}
}
}
void
rio(Fcall *fin, Fcall *fout)
{
Fid *f;
int count;
count = fout->count;
if((f = getfid(fin->fid, 0)) == nil)
return;
switch(fout->type){
case Rread:
if(f->file != nil){
f->file->nread++;
f->file->bread += count;
}
stats->totread += count;
break;
case Rwrite:
if(f->file != nil){
f->file->nwrite++;
f->file->bwrite += count;
}
stats->totwrite += count;
break;
}
}
void
usage(void)
{
fprint(2, "usage: iostats [-dC] cmds [args ...]\n");
exits("usage");
}
void
main(int argc, char **argv)
{
Rpc *rpc;
ulong ttime;
char buf[64*1024];
float brpsec, bwpsec, bppsec;
int cpid, fspid, expid, rspid, dbg, n, mflag;
char *fds[3];
Waitmsg *w;
File *fs;
Req *r;
dbg = 0;
mflag = MREPL;
ARGBEGIN{
case 'd':
dbg++;
break;
case 'C':
mflag |= MCACHE;
break;
default:
usage();
}ARGEND
if(argc == 0)
usage();
if(pipe(pfd) < 0)
sysfatal("pipe: %r");
/* dup std fds to be inherited to exportfs */
fds[0] = smprint("/fd/%d", dup(0, -1));
fds[1] = smprint("/fd/%d", dup(1, -1));
fds[2] = smprint("/fd/%d", dup(2, -1));
switch(cpid = fork()) {
case -1:
sysfatal("fork: %r");
case 0:
close(pfd[1]);
close(atoi(strrchr(fds[0], '/')+1));
close(atoi(strrchr(fds[1], '/')+1));
close(atoi(strrchr(fds[2], '/')+1));
if(getwd(buf, sizeof(buf)) == 0)
sysfatal("no working directory: %r");
rfork(RFENVG|RFNAMEG);
if(mount(pfd[0], -1, "/", mflag, "") == -1)
sysfatal("mount /: %r");
/* replace std fds with the exported ones */
close(0); open(fds[0], OREAD);
close(1); open(fds[1], OWRITE);
close(2); open(fds[2], OWRITE);
bind("#c/pid", "/dev/pid", MREPL);
bind("#c/ppid", "/dev/ppid", MREPL);
bind("#e", "/env", MREPL|MCREATE);
bind("#d", "/fd", MREPL);
bind("#s", "/srv", MREPL|MCREATE);
if(chdir(buf) < 0)
sysfatal("chdir: %r");
exec(*argv, argv);
if(**argv != '/' && strncmp(*argv, "./", 2) != 0 && strncmp(*argv, "../", 3) != 0)
exec(smprint("/bin/%s", *argv), argv);
sysfatal("exec: %r");
default:
close(pfd[0]);
}
/* isolate us from interrupts */
rfork(RFNOTEG);
if(pipe(efd) < 0)
sysfatal("pipe: %r");
/* spawn exportfs */
switch(expid = fork()) {
default:
close(efd[0]);
close(atoi(strrchr(fds[0], '/')+1));
close(atoi(strrchr(fds[1], '/')+1));
close(atoi(strrchr(fds[2], '/')+1));
break;
case -1:
sysfatal("fork: %r");
case 0:
dup(efd[0], 0);
dup(efd[0], 1);
close(efd[0]);
close(efd[1]);
close(pfd[1]);
if(dbg){
execl("/bin/exportfs", "exportfs", "-d", "-r", "/", nil);
} else {
execl("/bin/exportfs", "exportfs", "-r", "/", nil);
}
sysfatal("exec: %r");
}
switch(fspid = fork()) {
default:
close(pfd[1]);
close(efd[1]);
buf[0] = '\0';
while((w = wait()) != nil && (cpid != -1 || fspid != -1 || expid != -1)){
if(w->pid == fspid)
fspid = -1;
else if(w->pid == expid)
expid = -1;
else if(w->pid == cpid){
cpid = -1;
strcpy(buf, w->msg);
if(fspid != -1)
postnote(PNPROC, fspid, DONESTR);
}
if(buf[0] == '\0')
strcpy(buf, w->msg);
free(w);
}
exits(buf);
case -1:
sysfatal("fork: %r");
case 0:
notify(catcher);
break;
}
stats->rpc[Tversion].name = "version";
stats->rpc[Tauth].name = "auth";
stats->rpc[Tflush].name = "flush";
stats->rpc[Tattach].name = "attach";
stats->rpc[Twalk].name = "walk";
stats->rpc[Topen].name = "open";
stats->rpc[Tcreate].name = "create";
stats->rpc[Tclunk].name = "clunk";
stats->rpc[Tread].name = "read";
stats->rpc[Twrite].name = "write";
stats->rpc[Tremove].name = "remove";
stats->rpc[Tstat].name = "stat";
stats->rpc[Twstat].name = "wstat";
for(n = 0; n < nelem(stats->rpc); n++)
stats->rpc[n].lo = 10000000000LL;
switch(rspid = rfork(RFPROC|RFMEM)) {
case 0:
/* read response from exportfs and pass to mount */
while(!done){
uchar tmp[sizeof(buf)];
Fcall f;
Req **rr;
n = read(efd[1], buf, sizeof(buf));
if(n < 0)
break;
if(n == 0)
continue;
/* convert response */
memset(&f, 0, sizeof(f));
memmove(tmp, buf, n);
if(convM2S(tmp, n, &f) != n)
sysfatal("convM2S: %r");
/* find request to this response */
lock(&rqlock);
for(rr = &rqhead; (r = *rr) != nil; rr = &r->next){
if(r->f.tag == f.tag){
*rr = r->next;
r->next = nil;
break;
}
}
stats->nproto += n;
unlock(&rqlock);
switch(f.type){
case Ropen:
case Rcreate:
ropen(&r->f, &f);
break;
case Rclunk:
case Rremove:
rclunk(&r->f);
break;
case Rattach:
rattach(&r->f, &f);
break;
case Rwalk:
rwalk(&r->f, &f);
break;
case Rread:
case Rwrite:
rio(&r->f, &f);
break;
}
rpc = &stats->rpc[r->f.type];
update(rpc, r->t);
rpc->bout += n;
free(r);
if(write(pfd[1], buf, n) != n)
break;
}
exits(nil);
default:
/* read request from mount and pass to exportfs */
while(!done){
n = read(pfd[1], buf, sizeof(buf));
if(n < 0)
break;
if(n == 0)
continue;
r = mallocz(sizeof(*r) + n, 1);
memmove(r->buf, buf, n);
if(convM2S(r->buf, n, &r->f) != n)
sysfatal("convM2S: %r");
rpc = &stats->rpc[r->f.type];
rpc->count++;
rpc->bin += n;
lock(&rqlock);
stats->nrpc++;
stats->nproto += n;
r->next = rqhead;
rqhead = r;
unlock(&rqlock);
r->t = nsec();
if(write(efd[1], buf, n) != n)
break;
}
}
/* shutdown */
done = 1;
postnote(PNPROC, rspid, DONESTR);
close(pfd[1]);
close(efd[1]);
/* dump statistics */
rpc = &stats->rpc[Tread];
brpsec = (double)stats->totread / (((float)rpc->time/1e9)+.000001);
rpc = &stats->rpc[Twrite];
bwpsec = (double)stats->totwrite / (((float)rpc->time/1e9)+.000001);
ttime = 0;
for(n = 0; n < nelem(stats->rpc); n++) {
rpc = &stats->rpc[n];
if(rpc->count == 0)
continue;
ttime += rpc->time;
}
bppsec = (double)stats->nproto / ((ttime/1e9)+.000001);
fprint(2, "\nread %llud bytes, %g Kb/sec\n", stats->totread, brpsec/1024.0);
fprint(2, "write %llud bytes, %g Kb/sec\n", stats->totwrite, bwpsec/1024.0);
fprint(2, "protocol %llud bytes, %g Kb/sec\n", stats->nproto, bppsec/1024.0);
fprint(2, "rpc %lud count\n\n", stats->nrpc);
fprint(2, "%-10s %5s %5s %5s %5s %5s T R\n",
"Message", "Count", "Low", "High", "Time", "Averg");
for(n = 0; n < nelem(stats->rpc); n++) {
rpc = &stats->rpc[n];
if(rpc->count == 0)
continue;
fprint(2, "%-10s %5lud %5llud %5llud %5llud %5llud ms %8llud %8llud bytes\n",
rpc->name,
rpc->count,
rpc->lo/1000000,
rpc->hi/1000000,
rpc->time/1000000,
rpc->time/1000000/rpc->count,
rpc->bin,
rpc->bout);
}
fprint(2, "\nOpens Reads (bytes) Writes (bytes) File\n");
for(fs = stats->file; fs < &stats->file[Maxfile]; fs++){
if(fs->nopen == 0)
break;
if(strcmp(fs->path, fds[0]) == 0)
fs->path = "stdin";
else if(strcmp(fs->path, fds[1]) == 0)
fs->path = "stdout";
else if(strcmp(fs->path, fds[2]) == 0)
fs->path = "stderr";
fprint(2, "%5lud %8lud %8llud %8lud %8llud %s\n",
fs->nopen,
fs->nread, fs->bread,
fs->nwrite, fs->bwrite,
fs->path);
}
exits(nil);
}