Cooperative Reduced Power Mode Suspension For High Input/Output ('I/O') Workloads

Abstract

Method of cooperative reduced power mode suspension for high input/output (‘I/O’) workloads, including: determining, by a transfer monitoring module, a size of a file to be transferred to a recipient, wherein the recipient includes a central processing unit (CPU) operating in a reduced power mode; determining, by the transfer monitoring module, a desired transfer rate for transferring the file to the recipient; calculating, by the transfer monitoring module, an expected transfer completion time in dependence upon the size of the file and the desired transfer rate; and sending, by the transfer monitoring module, a message to the recipient requesting that the CPU suspend the reduced power mode in dependence upon the expected transfer completion time.

1 . A method of cooperative reduced power mode suspension for high input/output (‘I/O’) workloads, the method comprising:
 determining, by a transfer monitoring module, a size of a file to be transferred to a recipient, wherein the recipient includes a central processing unit (‘CPU’) operating in a reduced power mode; 
 determining, by the transfer monitoring module, a desired transfer rate for transferring the file to the recipient; 
 calculating, by the transfer monitoring module, an expected transfer completion time in dependence upon the size of the file and the desired transfer rate; and 
 sending, by the transfer monitoring module, a message to the recipient requesting that the CPU suspend the reduced power mode in dependence upon the expected transfer completion time. 
 
     
     
         2 . The method of  claim 1  further comprising:
 determining, by the transfer monitoring module, a size of memory free in a transfer receive buffer of the recipient; 
 determining, by the transfer monitoring module, whether the size of memory free in the transfer receive buffer of the recipient exceeds the size of the file to be transferred; and 
 wherein, responsive to determining that the size of memory free in the transfer receive buffer of the recipient exceeds the size of the file to be transferred, sending the message to the recipient includes suppressing the message to the recipient requesting that the CPU suspend the reduced power mode. 
 
     
     
         3 . The method of  claim 1  further comprising:
 determining, by the transfer monitoring module, an amount of time required for the CPU to switch to a reduced power mode; 
 calculating, by the transfer monitoring module, a remaining transfer completion time in dependence upon the size of a remaining portion of the file to be transferred and the desired transfer rate; 
 determining, by the transfer monitoring module, whether the remaining transfer completion time is less than or equal to the amount of time required for the CPU to switch to the reduced power mode; and 
 responsive to determining that the remaining transfer completion time is less than or equal to the amount of time required for the CPU to switch to the reduced power mode, sending a message to the recipient requesting that the CPU enter the reduced power mode. 
 
     
     
         4 . The method of  claim 1  further comprising:
 determining, by the transfer monitoring module, an amount of time until available memory in a transfer receive buffer of the recipient will be fully utilized in dependence upon the desired transfer rate for transferring the file to the recipient; and 
 wherein sending, by the transfer monitoring module, a message to the recipient requesting that the CPU suspend the reduced power mode in dependence upon the expected transfer completion time further comprises suppressing the message in dependence upon the amount of time until available memory in a transfer receive buffer of the recipient will be fully utilized. 
 
     
     
         5 . The method of  claim 1  wherein the message to the recipient requesting that the CPU suspend the reduced power mode includes a remaining expected transfer completion time. 
     
     
         6 . The method of  claim 1  further comprising:
 receiving, by the recipient, the message requesting that the CPU suspend the reduced power mode, the message including the expected transfer completion time; 
 suspending, by the recipient, the reduced power mode for the CPU for a period of time in dependence upon the expected transfer completion time; and 
 resuming, by the recipient, the reduced power mode for the CPU upon expiration of the period of time. 
 
     
     
         7 - 20 . (canceled)