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read the timestamp counter. closes #1012

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git-svn-id: file:///svn/tokudb@5018 c7de825b-a66e-492c-adef-691d508d4ae1
This commit is contained in:
Rich Prohaska 2008-07-09 18:50:06 +00:00
parent 3381558927
commit a68937a031
2 changed files with 56 additions and 0 deletions
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22
db-benchmark-test/scanscan.c
View file

@ -7,12 +7,30 @@
#include <sys/resource.h>
#include <stdlib.h>
#include <unistd.h>
#include "rdtsc.h"
const char *pname;
enum run_mode { RUN_HWC, RUN_LWC, RUN_VERIFY } run_mode = RUN_HWC;
int do_txns=1, prelock=0, prelockflag=0;
u_int32_t lock_flag = 0;
int do_rdtsc = 0;
#define NTRACE 1000000
int next_trace = 0;
unsigned long long tracebuffer[NTRACE];
static inline void add_trace() {
#if USE_RDTSC
if (next_trace < NTRACE)
tracebuffer[next_trace++] = rdtsc();
#endif
}
void print_trace() {
if (do_rdtsc == 0) return;
int i;
for (i=0; i<NTRACE; i++)
if (tracebuffer[i]) printf("%llu\n", tracebuffer[i]);
}
void parse_args (int argc, const char *argv[]) {
pname=argv[0];
@ -33,6 +51,7 @@ void parse_args (int argc, const char *argv[]) {
else if (strcmp(*argv, "--prelockflag")==0) { prelockflag=1; lock_flag = DB_PRELOCKED; }
else if (strcmp(*argv, "--prelockwriteflag")==0) { prelockflag=1; lock_flag = DB_PRELOCKED_WRITE; }
else if (strcmp(*argv, "--nox")==0) { do_txns=0; }
else if (strcmp(*argv, "--rdtsc")==0) { do_rdtsc=1; }
else {
fprintf(stderr, "Usage:\n%s [--verify-lwc | --lwc | --nohwc] [--prelock] [--prelockflag] [--prelockwriteflag]\n", pname);
fprintf(stderr, " --hwc run heavy weight cursors (this is the default)\n");
@ -116,7 +135,9 @@ void scanscan_hwc (void) {
if (prelockflag && (counter || prelock)) {
c_get_flags |= lock_flag;
}
add_trace();
while (0 == (r = dbc->c_get(dbc, &k, &v, c_get_flags))) {
add_trace();
totalbytes += k.size + v.size;
rowcounter++;
}
@ -124,6 +145,7 @@ void scanscan_hwc (void) {
double thistime = gettime();
double tdiff = thistime-prevtime;
printf("Scan %lld bytes (%d rows) in %9.6fs at %9fMB/s\n", totalbytes, rowcounter, tdiff, 1e-6*totalbytes/tdiff);
print_trace();
}
}

34
include/rdtsc.h Normal file
View file

@ -0,0 +1,34 @@
// read the processor time stamp register
#if defined __i386__
#define USE_RDTSC 1
static inline unsigned long long rdtsc() {
unsigned long hi, lo;
__asm__ __volatile__ ("rdtsc\n"
"movl %%edx,%0\n"
"movl %%eax,%1" : "=r"(hi), "=r"(lo) : : "edx", "eax");
return ((unsigned long long) hi << 32ULL) + (unsigned long long) lo;
}
#else
#if defined __x86_64__
#define USE_RDTSC 1
static inline unsigned long long rdtsc() {
unsigned long long r;
__asm__ __volatile__ ("rdtsc\n"
"shl $32,%%rdx\n"
"or %%rdx,%%rax\n"
"movq %%rax,%0" : "=r"(r) : : "edx", "eax", "rdx", "rax");
return r;
}
#else
#define USE_RDTSC 0
#endif
#endif