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average credit formula 

svn path=/trunk/boinc/; revision=792
This commit is contained in:
David Anderson 2003-01-02 21:52:13 +00:00
parent 2ee0fc3ce4
commit 38e20515b0
1 changed files with 9 additions and 6 deletions
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15
sched/validate.C
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@ -68,11 +68,11 @@ int min_quorum;
// log(2)
#define SECONDS_IN_DAY (3600*24)
#define AVG_HALF_LIFE (SECONDS_IN_DAY*7)
#define ALPHA (1./(AVG_HALF_LIFE*LOG2))
#define ALPHA (LOG2/AVG_HALF_LIFE)
// update an exponential average of credit per second.
//
void update_average(double credit, double& avg, double& avg_time) {
void update_average(double credit_assigned_time, double credit, double& avg, double& avg_time) {
time_t now = time(0);
// decrease existing average according to how long it's been
@ -80,9 +80,12 @@ void update_average(double credit, double& avg, double& avg_time) {
//
if (avg_time) {
double deltat = now - avg_time;
avg *= exp(-deltat/ALPHA);
avg *= exp(-deltat*ALPHA);
}
avg += credit*ALPHA;
double deltat = now - credit_assigned_time;
// Add (credit)/(number of days to return result) to credit, which
// is the average number of cobblestones per day
avg += credit/(deltat/86400);
avg_time = now;
}
@ -100,12 +103,12 @@ int grant_credit(RESULT& result, double credit) {
if (retval) return retval;
user.total_credit += credit;
update_average(credit, user.expavg_credit, user.expavg_time);
update_average(result.sent_time, credit, user.expavg_credit, user.expavg_time);
retval = db_user_update(user);
if (retval) return retval;
host.total_credit += credit;
update_average(credit, host.expavg_credit, host.expavg_time);
update_average(result.sent_time, credit, host.expavg_credit, host.expavg_time);
retval = db_host_update(host);
if (retval) return retval;