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more experiments with long replies, glue output buffer, and writev.

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This commit is contained in:
antirez
2009-11-18 20:32:03 +01:00
parent cc30e368a3
commit c28b42acd9
3 changed files with 25 additions and 20 deletions
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37
redis.c
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@ -1351,33 +1351,29 @@ static void freeClient(redisClient *c) {
#define GLUEREPLY_UP_TO (1024)
static void glueReplyBuffersIfNeeded(redisClient *c) {
int totlen = 0;
int copylen = 0;
char buf[GLUEREPLY_UP_TO];
listNode *ln;
robj *o;
listRewind(c->reply);
while((ln = listYield(c->reply))) {
o = ln->value;
totlen += sdslen(o->ptr);
/* This optimization makes more sense if we don't have to copy
* too much data */
if (totlen > GLUEREPLY_UP_TO) return;
}
if (totlen > 0) {
char buf[GLUEREPLY_UP_TO];
int copylen = 0;
int objlen;
listRewind(c->reply);
while((ln = listYield(c->reply))) {
o = ln->value;
memcpy(buf+copylen,o->ptr,sdslen(o->ptr));
copylen += sdslen(o->ptr);
o = ln->value;
objlen = sdslen(o->ptr);
if (copylen + objlen <= GLUEREPLY_UP_TO) {
memcpy(buf+copylen,o->ptr,objlen);
copylen += objlen;
listDelNode(c->reply,ln);
} else {
if (copylen == 0) return;
break;
}
/* Now the output buffer is empty, add the new single element */
o = createObject(REDIS_STRING,sdsnewlen(buf,totlen));
listAddNodeTail(c->reply,o);
}
/* Now the output buffer is empty, add the new single element */
o = createObject(REDIS_STRING,sdsnewlen(buf,copylen));
listAddNodeHead(c->reply,o);
}
static void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask) {
@ -1387,8 +1383,6 @@ static void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask)
REDIS_NOTUSED(el);
REDIS_NOTUSED(mask);
if (server.glueoutputbuf && listLength(c->reply) > 1)
glueReplyBuffersIfNeeded(c);
/* Use writev() if we have enough buffers to send */
#if 0
@ -1401,6 +1395,9 @@ static void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask)
#endif
while(listLength(c->reply)) {
if (server.glueoutputbuf && listLength(c->reply) > 1)
glueReplyBuffersIfNeeded(c);
o = listNodeValue(listFirst(c->reply));
objlen = sdslen(o->ptr);