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@@ -61,20 +61,35 @@ You can filter insights by runtime, service, or environment to narrow the list t | |||||
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| Automated Analysis supports finding the following insights: | ||||||
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| | Name | Priority | Description | | ||||||
| |---------------------------|----------|-------------| | ||||||
| | Duplicated Flags | Info | Triggers if duplicate flags were provided to the runtime (for example, `-Xmx2g -Xmx5g`). This is a problem as it may lead to changes not having the expected effect. | | ||||||
| | Explicit GC | Info | Triggers if there are System.gc() calls. | | ||||||
| | GC Pause Peak Duration | Info | Triggers if at least one GC pause took more than 1 second. | | ||||||
| | GC Setup | Info | Triggers when one of the following is detected - serial GC used on a multi-core machine, parallel GC on a single-core machine, more GC threads were configured than available cores, or a parallel GC was configured to run in 1 thread | | ||||||
| | Head of line blocking | Info | Triggers if a queue event gets stuck behind the given activity. | | ||||||
| | Primitive Value Boxing | Info | Triggers if more than 5% of CPU time was spent doing primitive<>object value conversions. | | ||||||
| | Deadlocked Threads Detected | Warn | Triggers if max number of deadlocked threads over query context is bigger than 0. | | ||||||
| | GC Pauses | Warn | Triggers if more than 10% of time was spent in GC pauses. | | ||||||
| | Options | Warn | Triggers if undocumented, deprecated or non-recommended option flags were detected. | | ||||||
| | Stackdepth Setting | Warn | Triggers if events were found with truncated stacktraces which may make it hard to understand profiling data. | | ||||||
| | Thrown Exceptions | Warn | Triggers when the rate of thrown (caught and uncaught) exceptions per minute goes above a threshold (defaults to 10K) | | ||||||
| | VMOperation Peak Duration | Warn | Triggers if a blocking VM operation (or combination of operations close in time) takes more than 2 seconds. Reports details about the operation with the highest duration. | | ||||||
| | Name | Priority | Supported Runtime | Description | | ||||||
| |------------------------------|------------|-------------------------|-------------| | ||||||
| | Virtual Thread Pinning | High | Java | Triggers if virtual threads were pinned to their carrier threads for a prolonged time. | | ||||||
| | Virtual Thread Submit Failure| High | Java | Triggers if virtual threads could not be scheduled for execution. | | ||||||
| | Even Loop Blocking | Medium | Node | Triggers if callbacks were running for an extended period of time on the Main Event Loop thread. | | ||||||
| | Sync-over-Async Blocking | Medium | .NET | Triggers if async functions are detected in CPU samples. | | ||||||
| | Allocation Stall | Medium | Java | Triggers if a thread had to be paused due to insufficient available memory. | | ||||||
| | Explicit GC | Medium | Java | Triggers if there are System.gc() calls. | | ||||||
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| | GC Pause Peak Duration | Medium | Java | Triggers if at least one GC pause took more than 1 second. | | ||||||
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| | GC Setup | Medium | Java | Triggers when one of the following is detected - serial GC used on a multi-core machine, parallel GC on a single-core machine, more GC threads were configured than available cores, or a parallel GC was configured to run in 1 thread | | ||||||
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| | Deadlocked Threads Detected | Medium | Java | Triggers if max number of deadlocked threads over query context is bigger than 0. | | ||||||
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| | GC Pauses | Medium | Java | Triggers if more than 10% of time was spent in GC pauses. | | ||||||
| | GC Pause Peak Duration | Medium | Java | Triggers if there is a GC pause longer than 1 second. | | ||||||
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I think this was a duplicate of line 72 |
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| | Stackdepth Setting | Medium | Java | Triggers if events were found with truncated stacktraces which may make it hard to understand profiling data. | | ||||||
| | Thrown Exceptions | Medium | Java | Triggers when the rate of thrown (caught and uncaught) exceptions per minute goes above a threshold (defaults to 10K) | | ||||||
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| | VMOperation Peak Duration | Medium | Java | Triggers if a blocking VM operation (or combination of operations close in time) takes more than 2 seconds. Reports details about the operation with the highest duration. | | ||||||
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| | Blocking VMOperations | Medium | Java | Triggers if blocking VM operations (or combination of operations close in time) takes more than 5% of a profile. | | ||||||
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| | Code Cache Size | Medium | Java | Triggers if the Code Cache was filled during a profile. | | ||||||
| | High Lock Contention | Low | Java, Go, Python | Triggers if there is a high ratio of time waiting on locks vs time spent on-CPU. | | ||||||
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| | Libuv Pool Overload | Low | Node | Triggers if there were more concurrent tasks scheduled to run on the libuv thread pool than it has threads. | | ||||||
| | Excessive String Concatenation | Low | .NET | Triggers if there is a high ratio of CPU time spent concatenating strings. | | ||||||
| | Thread Pool Size | Low | Java | Triggers if a thread pool is CPU bound but is set to a size larger than the number of available cores. | | ||||||
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| | Head of line blocking | Low | Java | Triggers if a queue event gets stuck behind the given activity. | | ||||||
| | Primitive Value Boxing | Low | Java | Triggers if more than 5% of CPU time was spent doing primitive<>object value conversions. | | ||||||
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| | Duplicated Flags | Low | Java | Triggers if duplicate flags were provided to the runtime (for example, `-Xmx2g -Xmx5g`). This is a problem as it may lead to changes not having the expected effect. | | ||||||
| | Command Line Options Check | Low | Java | Triggers if undocumented, deprecated or non-recommended option flags were detected. | | ||||||
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| | GC Overhead | Low | Java, Ruby, Go, Node | Triggers if more than 20% of CPU time is related to GC activities or allocation overhead. | | ||||||
| | Context Switches | Low | Java | Triggers if the rate of context switches on the underlying system is greater than 50k per second. | | ||||||
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| ## Further reading | ||||||
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