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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) // log(2)
#define SECONDS_IN_DAY (3600*24) #define SECONDS_IN_DAY (3600*24)
#define AVG_HALF_LIFE (SECONDS_IN_DAY*7) #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. // 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); time_t now = time(0);
// decrease existing average according to how long it's been // 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) { if (avg_time) {
double deltat = now - 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; avg_time = now;
} }
@ -100,12 +103,12 @@ int grant_credit(RESULT& result, double credit) {
if (retval) return retval; if (retval) return retval;
user.total_credit += credit; 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); retval = db_user_update(user);
if (retval) return retval; if (retval) return retval;
host.total_credit += credit; 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); retval = db_host_update(host);
if (retval) return retval; if (retval) return retval;