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In this paper, we describe a prototype DSU implementation for C programs that permits adding, deleting, and changing program definitions, including functions, global variables, and type declarations.

We compile programs specially so that they can be dynamically patched, and generate most of a dynamic patch automatically.

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The majority of updates were easy to generate, though more effort was required for signficant functional changes.

Compiling for updateability had virtually no impact on server performance, but would be more significant for compute-bound programs. Hicks is an assistant professor in the Computer Science department at the University of Maryland, College Park. dissertation, he designed and implemented a general, language-based approach for dynamically upgrading running software.

To concretely illustrate and validate our system, we have implemented a sizeable application: a dynamically updateable web server, called Flash Ed.

We discuss our experience building and maintaining Flash Ed.

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DSU is appealing compared to other approaches for on-line upgrades because it is quite general and…

Performance experiments show that updateable Flash Ed runs roughly 2% slower than a static one under various work loads.

^ Computer Science Hicks, Michael William, "Dynamic software updating" (2001).

A novel aspect of our patches is that they consist of verifiable native code (or VNC, see (Nec97, MWCG99)), which is native code accompanied by annotations that allow on-line verification of the code's safety.

We discuss how patches are generated mostly automatically, how they are applied using our own novel dynamic-linking technology for VNC systems, and how code is compiled to make it updateable.

DSU is appealing compared to other approaches for on-line upgrades because it is quite general and…Performance experiments show that updateable Flash Ed runs roughly 2% slower than a static one under various work loads.^ Computer Science Hicks, Michael William, "Dynamic software updating" (2001).A novel aspect of our patches is that they consist of verifiable native code (or VNC, see (Nec97, MWCG99)), which is native code accompanied by annotations that allow on-line verification of the code's safety.We discuss how patches are generated mostly automatically, how they are applied using our own novel dynamic-linking technology for VNC systems, and how code is compiled to make it updateable.Software systems are imperfect, so software updates are a fact of life.