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Microsecond latency resolution in redis-benchmark

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This commit is contained in:
Pieter Noordhuis 2010-11-04 14:47:15 +01:00
parent ec8f06675a
commit 8146e31677
1 changed files with 40 additions and 28 deletions
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68
src/redis-benchmark.c
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@ -45,17 +45,10 @@
#include "adlist.h"
#include "zmalloc.h"
#define REPLY_INT 0
#define REPLY_RETCODE 1
#define REPLY_BULK 2
#define REPLY_MBULK 3
#define CLIENT_CONNECTING 0
#define CLIENT_SENDQUERY 1
#define CLIENT_READREPLY 2
#define MAX_LATENCY 5000
#define REDIS_NOTUSED(V) ((void) V)
static struct config {
@ -75,7 +68,7 @@ static struct config {
int keepalive;
long long start;
long long totlatency;
int *latency;
long long *latency;
char *title;
list *clients;
int quiet;
@ -87,9 +80,10 @@ typedef struct _client {
redisContext *context;
int state;
sds obuf;
unsigned int written; /* bytes of 'obuf' already written */
unsigned int written; /* bytes of 'obuf' already written */
int replytype;
long long start; /* start time in milliseconds */
long long start; /* start time of a request */
long long latency; /* request latency */
} *client;
/* Prototypes */
@ -97,6 +91,16 @@ static void writeHandler(aeEventLoop *el, int fd, void *privdata, int mask);
static void createMissingClients(client c);
/* Implementation */
static long long ustime(void) {
struct timeval tv;
long long ust;
gettimeofday(&tv, NULL);
ust = ((long)tv.tv_sec)*1000000;
ust += tv.tv_usec;
return ust;
}
static long long mstime(void) {
struct timeval tv;
long long mst;
@ -136,7 +140,8 @@ static void resetClient(client c) {
aeCreateFileEvent(config.el,c->context->fd,AE_WRITABLE,writeHandler,c);
c->written = 0;
c->state = CLIENT_SENDQUERY;
c->start = mstime();
c->start = ustime();
c->latency = -1;
}
static void randomizeClientKey(client c) {
@ -153,12 +158,6 @@ static void randomizeClientKey(client c) {
}
static void clientDone(client c) {
long long latency;
config.donerequests ++;
latency = mstime() - c->start;
if (latency > MAX_LATENCY) latency = MAX_LATENCY;
config.latency[latency]++;
if (config.donerequests == config.requests) {
freeClient(c);
aeStop(config.el);
@ -182,6 +181,11 @@ static void readHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
REDIS_NOTUSED(fd);
REDIS_NOTUSED(mask);
/* Calculate latency only for the first read event. This means that the
* server already sent the reply and we need to parse it. Parsing overhead
* is not part of the latency, so calculate it only once, here. */
if (c->latency < 0) c->latency = ustime()-(c->start);
if (redisBufferRead(c->context) != REDIS_OK) {
fprintf(stderr,"Error: %s\n",c->context->errstr);
exit(1);
@ -190,8 +194,11 @@ static void readHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
fprintf(stderr,"Error: %s\n",c->context->errstr);
exit(1);
}
if (reply != NULL)
if (reply != NULL) {
if (config.donerequests < config.requests)
config.latency[config.donerequests++] = c->latency;
clientDone(c);
}
}
}
@ -203,7 +210,8 @@ static void writeHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
if (c->state == CLIENT_CONNECTING) {
c->state = CLIENT_SENDQUERY;
c->start = mstime();
c->start = ustime();
c->latency = -1;
}
if (sdslen(c->obuf) > c->written) {
void *ptr = c->obuf+c->written;
@ -258,8 +266,12 @@ static void createMissingClients(client c) {
}
}
static int compareLatency(const void *a, const void *b) {
return (*(long long*)a)-(*(long long*)b);
}
static void showLatencyReport(void) {
int j, seen = 0;
int i, curlat = 0;
float perc, reqpersec;
reqpersec = (float)config.donerequests/((float)config.totlatency/1000);
@ -271,11 +283,13 @@ static void showLatencyReport(void) {
printf(" %d bytes payload\n", config.datasize);
printf(" keep alive: %d\n", config.keepalive);
printf("\n");
for (j = 0; j <= MAX_LATENCY; j++) {
if (config.latency[j]) {
seen += config.latency[j];
perc = ((float)seen*100)/config.donerequests;
printf("%.2f%% <= %d milliseconds\n", perc, j);
qsort(config.latency,config.requests,sizeof(long long),compareLatency);
for (i = 0; i < config.requests; i++) {
if (config.latency[i]/1000 != curlat || i == (config.requests-1)) {
curlat = config.latency[i]/1000;
perc = ((float)(i+1)*100)/config.requests;
printf("%.2f%% <= %d milliseconds\n", perc, curlat);
}
}
printf("%.2f requests per second\n\n", reqpersec);
@ -285,7 +299,6 @@ static void showLatencyReport(void) {
}
static void prepareForBenchmark(char *title) {
memset(config.latency,0,sizeof(int)*(MAX_LATENCY+1));
config.title = title;
config.start = mstime();
config.donerequests = 0;
@ -400,13 +413,12 @@ int main(int argc, char **argv) {
config.idlemode = 0;
config.latency = NULL;
config.clients = listCreate();
config.latency = zmalloc(sizeof(int)*(MAX_LATENCY+1));
config.hostip = "127.0.0.1";
config.hostport = 6379;
config.hostsocket = NULL;
parseOptions(argc,argv);
config.latency = zmalloc(sizeof(long long)*config.requests);
if (config.keepalive == 0) {
printf("WARNING: keepalive disabled, you probably need 'echo 1 > /proc/sys/net/ipv4/tcp_tw_reuse' for Linux and 'sudo sysctl -w net.inet.tcp.msl=1000' for Mac OS X in order to use a lot of clients/requests\n");