<? require_once("docutil.php"); page_head("Scheduling server: policy"); echo " <p> The scheduling server will attempt to send enough work to exceed a hosts high water mark. If the amount of work the scheduling server is sending exceeds a certain level (default is four weeks), the scheduling server will not attach more work to a scheduler reply. This does not prevent the scheduling server from sending a lengthy workunit, but rather from sending multiple lengthy workunits. <p> If a work unit uses more disk resources than a host has available, the scheduling server will not attach that work unit. <p> The scheduling server estimates the amount of time a work unit will take to complete with the formula <b>(number of flops)/(flops per second)+(number of iops)/(iops per second)</b>. The number of floating point and integer operations are provided by the project when creating the work unit, and the host calculation speeds are included in a scheduler request. <p> If no work is available, the scheduling server sends the message <tt>no work available</tt> with priority <tt>low</tt>, and requests that the client wait before sending another request. <p> If there is work available, but the host cannot accept it for whatever reason (too slow, not enough space, etc), then the scheduling server sends the message <tt>host unacceptable</tt> with priority <tt>low</tt>, and requests that the client wait before sending another request. "; page_tail(); ?>