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avoid extra calls to gettimeofday() when the log is not durable; set group commit to wait for 10msec, not 100...

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This commit is contained in:
Sears Russell 2009-02-03 05:36:33 +00:00
parent 95e9158847
commit 4ce4491097
1 changed files with 32 additions and 27 deletions
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13
src/stasis/logger/logger2.c
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@ -197,19 +197,21 @@ static void groupCommit(stasis_log_t* log, lsn_t lsn) {
static pthread_mutex_t check_commit = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t tooFewXacts = PTHREAD_COND_INITIALIZER;
struct timeval now;
struct timespec timeout;
pthread_mutex_lock(&check_commit);
if(log->first_unstable_lsn(log,LOG_FORCE_COMMIT) > lsn) {
pthread_mutex_unlock(&check_commit);
return;
}
if(log->is_durable(log)) {
struct timeval now;
struct timespec timeout;
gettimeofday(&now, NULL);
timeout.tv_sec = now.tv_sec;
timeout.tv_nsec = now.tv_usec * 1000;
// 0123456789 <- number of zeros on the next three lines...
timeout.tv_nsec += 100000000; // wait ten msec.
timeout.tv_nsec += 10000000; // wait ten msec.
if(timeout.tv_nsec > 1000000000) {
timeout.tv_nsec -= 1000000000;
timeout.tv_sec++;
@ -217,7 +219,7 @@ static void groupCommit(stasis_log_t* log, lsn_t lsn) {
pendingCommits++;
int xactcount = TactiveTransactionCount();
if((log->is_durable(log) && xactcount > 1 && pendingCommits < xactcount) ||
if((xactcount > 1 && pendingCommits < xactcount) ||
(xactcount > 20 && pendingCommits < (int)((double)xactcount * 0.95))) {
int retcode;
while(ETIMEDOUT != (retcode = pthread_cond_timedwait(&tooFewXacts, &check_commit, &timeout))) {
@ -234,6 +236,9 @@ static void groupCommit(stasis_log_t* log, lsn_t lsn) {
}
}
}
} else {
pendingCommits++;
}
if(log->first_unstable_lsn(log,LOG_FORCE_COMMIT) <= lsn) {
log->force_tail(log, LOG_FORCE_COMMIT);
assert(log->first_unstable_lsn(log,LOG_FORCE_COMMIT) > lsn);