Adaptive bandwidth distribution system for high-performance input/output devices with variable throughput
First Claim
1. A method for processing input/output (I/O) requests located within a queue for managing bandwidth allocation between an application that issues I/O operation requests and an I/O device, the method comprising:
- detecting that an I/O request is at a front of a queue of pending I/O requests associated with the I/O device;
determining that the I/O request is a shadow request, wherein the shadow request reserves a position in the queue for a future I/O operation request from the application, and wherein the shadow request is associated with a duration of time;
polling the application for the duration of time to determine whether the application issues an I/O operation request that includes a request for either of a read operation from the I/O device to the application or a write operation from the application to the I/O device;
receiving a first I/O operation request from the application during the duration of time associated with the shadow request; and
unblocking the application to allow a first I/O operation associated with the first I/O operation request to be executed.
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Accused Products
Abstract
A method for issuing shadow requests to manage bandwidth allocation between an application that issues input/output (I/O) operation requests and an I/O device. A bandwidth manager detects the completion of an I/O operation, which includes either a read operation or a write operation. The bandwidth manager calculates a statistical duration for future I/O operations between the application and the I/O device based on throughput statistics related to past I/O operations. The bandwidth manager generates a shadow request for reserving a position in a queue that stores pending I/O requests for the I/O device for a first future I/O operation request from the application and having a duration related to the statistical duration, and inserts the shadow request into the queue. Advantageously, applications that do not make frequent I/O operation requests in advance may still execute I/O operations because bandwidth is reserved for future I/O operation requests via the shadow requests.
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Citations
20 Claims
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1. A method for processing input/output (I/O) requests located within a queue for managing bandwidth allocation between an application that issues I/O operation requests and an I/O device, the method comprising:
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detecting that an I/O request is at a front of a queue of pending I/O requests associated with the I/O device; determining that the I/O request is a shadow request, wherein the shadow request reserves a position in the queue for a future I/O operation request from the application, and wherein the shadow request is associated with a duration of time; polling the application for the duration of time to determine whether the application issues an I/O operation request that includes a request for either of a read operation from the I/O device to the application or a write operation from the application to the I/O device; receiving a first I/O operation request from the application during the duration of time associated with the shadow request; and unblocking the application to allow a first I/O operation associated with the first I/O operation request to be executed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computer-readable medium storing instructions that, when executed by a processor, cause a bandwidth manager to process input/output (I/O) requests located within a queue for managing bandwidth allocation between an application that issues I/O operation requests and an I/O device, by performing the steps of:
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detecting that an I/O request is at a front of a queue of pending I/O requests associated with the I/O device; determining that the I/O request is a shadow request, wherein the shadow request reserves a position in the queue for a future I/O operation request from the application, and wherein the shadow request is associated with a duration of time; polling the application for the duration of time to determine whether the application issues an I/O operation request that includes a request for either of a read operation from the I/O device to the application or a write operation from the application to the I/O device; receiving a first I/O operation request from the application during the duration of time associated with the shadow request; and unblocking the application to allow a first I/O operation associated with the first I/O operation request to be executed. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification