Memory
This service is responsible for keeping track of the memory that is used internally by the JVM of the owner cluster element. The service reacts by sending events to different managers and services in order to start actions for saving memory, such as ejb passivation, objects pools sizes truncation, sessions passivation and expiration.
The Memory monitoring group contains the following important monitors that are activated by default:
● AllocatedMemory
Description of monitor |
Currently allocated memory. |
Description of possible problems and their impact |
Does not indicate a problem. |
Boundary conditions for the metric (thresholds) |
Does not indicate a problem. We recommend you set the following: GY 0 YR -1 RY-1 YG 0 |
Recommended procedure if a problem occurs |
Does not indicate a problem. |
● AllocatedMemoryRate
Description of monitor |
Ratio of the allocated memory to the available memory. |
Description of possible problems and their impact |
The ratio is important to detect how effectively the memory is used. When the usage rate is near to 100% the normal operation of the J2EE Engine may be disturbed. This could be a symptom of a memory leak or garbage pollution situations. |
Boundary conditions for the metric (thresholds) |
We recommend you set the following: GY 80 YR 95 RY 95 YG 80 |
Recommended procedure if a problem occurs |
Make GC dump for analysis. Increase memory heap settings. |
● AvailableMemory
Description of monitor |
Currently available memory. |
Description of possible problems and their impact |
Does not indicate a problem. |
Boundary conditions for the metric (thresholds) |
Does not indicate a problem. We recommend you set the following: GY 0 YR -1 RY -1 YG 0 |
Recommended procedure if a problem occurs |
Does not indicate a problem. |
● UsedMemory
Description of monitor |
Currently used memory. |
Description of possible problems and their impact |
Does not indicate a problem. |
Boundary conditions for the metric (thresholds) |
Does not indicate a problem. We recommend to set the following: GY 0 YR -1 RY-1 YG 0 |
Recommended procedure if a problem occurs |
Does not indicate a problem. |
● UsedMemoryRate
Description of monitor |
Ratio of the used memory to the available memory. |
Description of possible problems and their impact
|
The ratio is important to detect how effectively the memory is used. When the usage rate is near to 100% the normal operation of the J2EE Engine may be disturbed. This could be a symptom of a memory leak or garbage pollution situations. |
Boundary conditions for the metric (thresholds) |
We recommend you set the following: GY 80 YR 95 RY 95 YG 80 |
Recommended procedure if a problem occurs |
Make GC dump for analysis. |