System and method for deallocation a first message independently of the deallocation of a second message in a bundle of messages

• US 5,392,398 A
• Filed: 04/20/1992
• Issued: 02/21/1995
• Est. Priority Date: 04/20/1992
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Meyer, Christopher
• Primary Examiner(s): Richardson, Robert L.
• Assistant Examiner(s): Meky, Moustafa M.
• Application Number:
  US07/871,867
• Time in Patent Office: 1,037 Days
• Field of Search: 395/200, 395/250, 395/425, 395/600, 395/725, 364/200, 364/900, 364/239.5, 364/239.51, 364/245.5, 364/282.2, 364/284.3, 370/94.1, 370/60, 370/85.1
• US Class Current: 709/236
• CPC Class Codes: G06F 9/544 Buffers; Shared memory; Pipes
• CPC Class Codes: H04L 47/36 by determining packet size, e.g. maximum transfer unit [MTU]
• CPC Class Codes: H04L 47/365 Dynamic adaptation of the packet size
• CPC Class Codes: H04L 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

In a cooperative processing system, a client sends bundles of padded messages to a server which receives the messages, processes them and deallocates the storage for each message piecemeal. A storage manager of the server handles integer multiples of some minimum granularity (n) of storage units, and allows storage to be deallocated in amounts smaller than the amount originally allocated. The client packages and bundles each message into an amount of storage equal to an integer multiple of the server storage granularity, before sending the bundle to the server via a communications transport. The server places the bundle into a single buffer, with each message occupying a corresponding portion of the buffer. Each message is then unbundled for processing in place by the server process to which it was sent, after which its portion of storage is immediately deallocated.

Claims

1. In a computerized data processing system including a client system, a server system having a storage deallocation granularity, and means for sending messages in bundles from the client system to the server system, the improvement comprising:

means for padding a first message to an integer multiple of said granularity and padding a second message to an integer multiple of said granularity before sending the messages to the server system;

means for bundling the first and second padded messages together and supplying the bundle to the means for sending so that the bundle is sent to the server system;

means, at the server system for storing the bundle in allocated storage; and

means for deallocating said storage in portions which are integer multiples of said granularity such that a portion of said storage containing said first message is deallocated separately from another portion of said storage containing said second message.

2. The improvement of claim 1, wherein the client and server systems comprise physically distinct computers and wherein the means for sending comprises a physical communication transport.

3. The improvement of claim 1, wherein the client system includes the means for padding.

4. The improvement of claim 1, wherein the client system includes the means for bundling.

5. The improvement of claim 4, wherein the bundle includes for each message a message descriptor and the padded message.

6. The improvement of claim 5, wherein the portion of storage corresponding to each of the messages includes the padded message, plus a message descriptor for a next message in the bundle.

7. A computerized data processing system comprising:

a client computer including

means for preparing at least first and second messages,

means for padding the messages to respective integer multiples of a storage granularity,

means for bundling the padded messages together into a bundle; and

means for sending the bundle; and

a server computer including

means for storing the bundle in allocated storage,

means for processing the first message before the second message,

means for determining for the first and second messages respective portions of said storage corresponding to said messages, said portions of storage being integer multiples of the storage granularity, and

means for deallocating the portion of storage corresponding to the first message before deallocating the portion of storage corresponding to the second message.

8. The system of claim 7, wherein the bundle includes for each of the messages a message descriptor and the padded message.

9. The system of claim 8, wherein each message descriptor is a message leader preceding its respective message and is an integer multiple of the storage granularity.

10. The system of claim 9, wherein the portion of storage corresponding to each message comprises the padded message, plus a message leader for a following message, if any, in the bundle.

11. The system of claim 7, wherein the means for deallocating is included in a storage manager of the server computer, and wherein the storage manager further includes means for allocating the portions of storage.

12. A method for communicating between a first computerized data processing system and a second computerized data processing system, the second system having a storage deallocation granularity, said method comprising the steps performed by the first system of:

preparing first and second messages;

padding each of the messages to an integer multiple of the storage deallocation granularity;

bundling the padded messages together; and

sending the bundle to the second system;

said method further comprising the steps performed by the second system of;

receiving the bundle from the first system;

contiguously storing the bundle, each message having a corresponding portion of storage which is an integer multiple of the storage deallocation granularity;

processing the first message and the second message; and

deallocating the portion of storage corresponding to the first message independently of deallocation of the portion of storage corresponding to the second message.

13. The method of claim 12, wherein the step of bundling comprises the step of adding a message descriptor between the messages.

14. The method of claim 13, wherein the step of bundling comprises the step of adding a message leader preceding each message.

15. The method of claim 12, wherein the messages are processed in place in their respective portions of storage.

16. The method of claim 15, wherein the step of deallocating the portion of storage corresponding to the first message is performed in response to the completion of processing of said message.

17. The method of claim 12, wherein the first system is a client workstation computer and the second system is a server host computer.