DECUS Heritage

Version: 1.4
Submitted By: Mikaiiro Laitinen, Dativo OY
Operating System: VAX/VMS V5.4-2
Source Language: MACRO-32, C
Keywords: Security, System Management - VMS, Utilities - VMS
Notes: Executable and/or object code is included.
Changes & Improvements: Some new and enhanced command qualifiers introduced. LOOP_PROFILE improved. KINSTAL.COM bugs fixed/tested. Documentation revised.
Restrictions: Privileges needed when installing the product (with VMSINSTAL). VAX C-compiler required if sources are used. At least VMS V5.2 required.

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Abstract: LOOPSCAN looks for a standalone VAX/VMS system or a VMScluster for processes that might be in a loop.

If such a process is found, LOOPSCAN

1. may take zero, one or more user-definable actions
2. may send a VMS mail message to a given list of users
3. may display an OPCOM-message at a user specified operator terminal

The user-definable actions include lowering the base priority of a looping process to a user-defined level, starting a 'daemon' to record the behavior of the looping process and suspending the looping process.

A process is considered to be looping if all the following conditions are met:

• it is frequently in COM or CUR state
• it does no I/O operations
• its CPU usage exceeds a user defined limit

All process modes (interactive, batch and network) are handled equally, but the user may set a priority level above which processes are not affected.

LOOPSCAN displays startup, termination and error messages along with looping process detected messages to SYS$OUTPUT. Optional logging items may be specified to monitor more closely the behavior of LOOPSCAN.

LOOPSCAN has a DCL interface through which all parameters are passed. The qualifiers and their usage are explained fully in a help file included.

Click on FTP to download from the FTP Achives.

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Last Update: Thu Jan 11 18:46:54 1996