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Enhance the ".stats" command in sqlite3.exe to show one-time stats information

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if invoked with one argument.  Also show /proc/PID/io information if run on
Linux.

FossilOrigin-Name: 3c36948f16b58fe8042c37d0df634308b4e48217
This commit is contained in:
drh
2016-02-27 17:12:36 +00:00
parent 4f8f5e4446
commit 3478490332
5 changed files with 62 additions and 19 deletions
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47
src/shell.c
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@@ -1284,6 +1284,43 @@ static char *save_err_msg(
return zErrMsg;
}
#ifdef __linux__
/*
** Attempt to display I/O stats on Linux using /proc/PID/io
*/
static void displayLinuxIoStats(FILE *out){
FILE *in;
char z[200];
sqlite3_snprintf(sizeof(z), z, "/proc/%d/io", getpid());
in = fopen(z, "rb");
if( in==0 ) return;
while( fgets(z, sizeof(z), in)!=0 ){
static const struct {
const char *zPattern;
const char *zDesc;
} aTrans[] = {
{ "rchar: ", "Number of bytes received by read():" },
{ "wchar: ", "Number of bytes sent to write():" },
{ "syscr: ", "Number of read() system calls:" },
{ "syscw: ", "Number of write() system calls:" },
{ "read_bytes: ", "Number of bytes from storage:" },
{ "write_bytes: ", "Number of bytes sent to storage:" },
{ "cancelled_write_bytes: ", "Cancelled write bytes:" },
};
int i;
for(i=0; i<ArraySize(aTrans); i++){
int n = (int)strlen(aTrans[i].zPattern);
if( strncmp(aTrans[i].zPattern, z, n)==0 ){
raw_printf(out, "%-36s %s", aTrans[i].zDesc, &z[n]);
break;
}
}
}
fclose(in);
}
#endif
/*
** Display memory stats.
*/
@@ -1406,6 +1443,10 @@ static int display_stats(
raw_printf(pArg->out, "Virtual Machine Steps: %d\n", iCur);
}
#ifdef __linux__
displayLinuxIoStats(pArg->out);
#endif
/* Do not remove this machine readable comment: extra-stats-output-here */
return 0;
@@ -1957,7 +1998,7 @@ static char zHelp[] =
" separator for both the output mode and .import\n"
".shell CMD ARGS... Run CMD ARGS... in a system shell\n"
".show Show the current values for various settings\n"
".stats on|off Turn stats on or off\n"
".stats ?on|off? Show stats or turn stats on or off\n"
".system CMD ARGS... Run CMD ARGS... in a system shell\n"
".tables ?TABLE? List names of tables\n"
" If TABLE specified, only list tables matching\n"
@@ -3835,8 +3876,10 @@ static int do_meta_command(char *zLine, ShellState *p){
if( c=='s' && strncmp(azArg[0], "stats", n)==0 ){
if( nArg==2 ){
p->statsOn = booleanValue(azArg[1]);
}else if( nArg==1 ){
display_stats(p->db, p, 0);
}else{
raw_printf(stderr, "Usage: .stats on|off\n");
raw_printf(stderr, "Usage: .stats ?on|off?\n");
rc = 1;
}
}else