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Update analysis insights table (#33078)
* Update analysis insights table * Apply suggestions from code review Co-authored-by: Janine Chan <[email protected]> * Added a few more insights. * Try splitting table into tabs * Reorder and rename tabs for consistency --------- Co-authored-by: Janine Chan <[email protected]> Co-authored-by: brantigua <[email protected]>
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‎content/en/profiler/automated_analysis.md‎

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@@ -61,20 +61,73 @@ 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 |
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|---------------------------|----------|-------------|
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| 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. |
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| Explicit GC | Info | Triggers if there are System.gc() calls. |
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| GC Pause Peak Duration | Info | Triggers if at least one GC pause took more than 1 second. |
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| 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 |
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| Head of line blocking | Info | Triggers if a queue event gets stuck behind the given activity. |
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| Primitive Value Boxing | Info | Triggers if more than 5% of CPU time was spent doing primitive<>object value conversions. |
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| Deadlocked Threads Detected | Warn | Triggers if max number of deadlocked threads over query context is bigger than 0. |
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| GC Pauses | Warn | Triggers if more than 10% of time was spent in GC pauses. |
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| Options | Warn | Triggers if undocumented, deprecated or non-recommended option flags were detected. |
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| Stackdepth Setting | Warn | Triggers if events were found with truncated stacktraces which may make it hard to understand profiling data. |
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| Thrown Exceptions | Warn | 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 | 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. |
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{{< tabs >}}
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{{% tab "Java" %}}
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| Name | Priority | Description |
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|------------------------------|------------|-------------|
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| Virtual Thread Pinning | High | Triggers if virtual threads were pinned to their carrier threads for a prolonged time. |
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| Virtual Thread Submit Failure| High | Triggers if virtual threads could not be scheduled for execution. |
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| Allocation Stall | Medium | Triggers if a thread had to be paused due to insufficient available memory. |
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| Blocking VMOperations | Medium | Triggers if blocking VM operations (or combination of operations close in time) take more than 5% of a profile. |
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| Code Cache Size | Medium | Triggers if the Code Cache was filled during a profile. |
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| CPU Burst | Medium | Triggers if there is more than 75% CPU utilization across a 10s window. |
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| CPU Burst Saturation | Medium | Triggers if there is at least 1 second where CPU utilization is at 100%. |
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| Deadlocked Threads Detected | Medium | Triggers if max number of deadlocked threads over query context is greater than 0. |
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| Explicit GC | Medium | Triggers if there are `System.gc()` calls. |
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| GC Pause Peak Duration | Medium | Triggers if at least one GC pause took more than one second. |
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| GC Pauses | Medium | Triggers if more than 10% of time was spent in GC pauses. |
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| GC Setup | Medium | 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 configured than available cores, or parallel GC configured to run in one thread. |
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| Stackdepth Setting | Medium | Triggers if events were found with truncated stacktraces which may make it hard to understand profiling data. |
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| Thrown Exceptions | Medium | 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 | Triggers if a blocking VM operation (or combination of operations close in time) takes more than two seconds. Reports details about the operation with the highest duration. |
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| VMOperations Ratio | Medium | Triggers if the total amount of blocking VM operations is a significant part of a 60 second window. |
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| Command Line Options Check | Low | Triggers if undocumented, deprecated, or non-recommended option flags were detected. |
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| Context Switches | Low | Triggers if the rate of context switches on the underlying system is greater than 50k per second. |
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| DebugNonSafepoints | Low | Triggers if a service is run with potentially less accurate settings for the profiler. |
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| Duplicated Flags | Low | 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. |
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| GC Overhead | Low | Triggers if more than 20% of CPU time is related to GC activities or allocation overhead. |
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| Head of line blocking | Low | Triggers if a queue event gets stuck behind the given activity. |
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| High Lock Contention | Low | Triggers if there is a high ratio of time waiting on locks to time spent on-CPU. |
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| Primitive Value Boxing | Low | Triggers if more than 5% of CPU time was spent converting values between primitive and object values. |
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| Thread Pool Size | Low | 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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| Unbalanced Parallelism | Low | Triggers if at least one peer thread is performing less than half the work of another in the same span. |
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{{% /tab %}}
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{{% tab "Python" %}}
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| Name | Priority | Description |
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|------------------------------|------------|-------------|
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| High Lock Contention | Low | Triggers if there is a high ratio of time waiting on locks to time spent on-CPU. |
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{{% /tab %}}
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{{% tab "Go" %}}
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| Name | Priority | Description |
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|------------------------------|------------|-------------|
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| GC Overhead | Low | Triggers if more than 20% of CPU time is related to GC activities or allocation overhead. |
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| High Lock Contention | Low | Triggers if there is a high ratio of time waiting on locks to time spent on-CPU. |
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{{% /tab %}}
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{{% tab "Ruby" %}}
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| Name | Priority | Description |
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|------------------------------|------------|-------------|
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| GC Overhead | Low | Triggers if more than 20% of CPU time is related to GC activities or allocation overhead. |
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{{% /tab %}}
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{{% tab "Node.js" %}}
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| Name | Priority | Description |
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|------------------------------|------------|-------------|
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| Event Loop Blocking | Medium | Triggers if callbacks were running for an extended period of time on the Main Event Loop thread. |
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| GC Overhead | Low | Triggers if more than 20% of CPU time is related to GC activities or allocation overhead. |
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| Libuv Pool Overload | Low | Triggers if there were more concurrent tasks scheduled to run on the libuv thread pool than it has threads. |
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{{% /tab %}}
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{{% tab ".NET" %}}
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| Name | Priority | Description |
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|------------------------------|------------|-------------|
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| Sync-over-Async Blocking | Medium | Triggers if async functions are detected in CPU samples. |
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| Excessive String Concatenation | Low | Triggers if there is a high ratio of CPU time spent concatenating strings. |
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{{% /tab %}}
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{{< /tabs >}}
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## Further reading
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