Title: Administrator Tip
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| FEATURED TIP |
| Understanding the ins-and-outs of activation groups -- Part I |
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by Ron Turull
Activation groups are an iSeries programmer's dream come true. They provide tremendous application design flexibility, and as designed, an ILE program could not run without activation groups.
But they can also be an administrator's worst nightmare. An improperly designed application can spawn dozens of activation groups, end normally and leave all those activation groups open, locking up precious resources. Multiply that scenario by hundreds of users, and you have the makings of an administrator's headache.
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SPONSORED BY: AS/400 Personnel
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Technical Questions Answered |
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How do you use activation groups?
One Search400.com member said activation groups seem like a nice feature, but that they require more effort than they're worth. He wondered how they could be used. A few other users described what they use them for and pointed out their benefits.
The trouble with Reclaim Resources
It isn't uncommon for an application to execute the Reclaim Resources command (RCLRSC) periodically as a "garbage-collecting" device to improve performance. And programs sometimes rely on the command to free static memory, close open files and free other resources. But watch out if you need to have the program start fresh and execute a RCLRSC in the calling program before calling the RPG program. The RCLRSC command will not work if you convert the whole thing to ILE and tell it to run in an activation group other the default.
Ten important things to remember about heaps
Memory for dynamic variables is allocated off an internal structure called the "heap." The heap is simply a chunk of memory that the system allocates for an activation group when the activation group is created. The Alloc, Dealloc, and Realloc op-codes are pretty straight-forward once you understand a few things about heaps.
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