Orchestration Engine Performance Counters

The orchestration engine maintains several performance counters that you can examine with Performance Monitor to see how many orchestration instances and transactions are being processed by the engine over time.

To run Performance Monitor, go to the Start Menu, select Run, type in perfmon, and press Enter. Click the Add button, and select XLANG/s Orchestrations from the Performance Object drop-down list.

The following performance counters are accessible for each host instance under the XLANG/s Orchestrations performance object category:

Counter	Comments
% used physical memory	Percentage used of total physical memory on the machine.
Active application domains	Number of loaded orchestration application domains in the process.
Average batch factor	Number of persistence points reached since the host instance started, divided by the number of underlying transactions.
Database transactions	Number of database transactions performed since the host instance started.
Database transactions/sec	Average number performed per second.
Dehydratable orchestrations	Number of orchestrations instances that can be dehydrated which are currently hosted by the host instance.
Dehydrating orchestrations	Number of orchestrations that are in the process of dehydrating.
Dehydration cycle in progress	Indicates whether there is a dehydration cycle currently in progress.
Dehydration cycles	Number of dehydration cycles completed.
Dehydration threshold	Number in milliseconds that determines how aggressively orchestrations are being dehydrated. If the orchestration engine predicts that an instance will be dehydratable for an amount of time longer than this threshold, it will dehydrate the instance.
Idle orchestrations	Number of idle orchestration instances currently hosted by the host instance. This refers to orchestrations that are not making progress but are not dehydratable, as when the orchestration is blocked waiting for a receive, listen, or delay in an atomic transaction.
Megabytes allocated private memory	Megabytes of allocated private memory for the host instance.
Megabytes allocated virtual memory	Megabytes reserved for virtual memory for the host instance.
MessageBox database connection failures	Number of attempted database connections that failed since the host instance started.
Online MessageBox databases	Number of MessageBox databases currently available to the application.
Orchestrations completed	Number of orchestration instances completed since the host instance started.
Orchestrations completed/sec	Average number completed per second.
Orchestrations created	Number of orchestration instances created since the host instance started.
Orchestrations created/sec	Average number created per second.
Orchestrations dehydrated	Number of orchestration instances dehydrated since the host instance started.
Orchestrations dehydrated/sec	Average number dehydrated per second.
Orchestrations discarded	Number of orchestration instances discarded from memory since the host instance started. An orchestration can be discarded if the engine fails to persist its state.
Orchestrations discarded/sec	Average number discarded per second.
Orchestrations rehydrated	Number of orchestration instances rehydrated since the host instance started.
Orchestrations rehydrated/sec	Average number rehydrated per second.
Orchestrations resident in memory	Number of orchestration instances currently hosted by the host instance.
Orchestrations scheduled for dehydration	Number of dehydratable orchestrations for which there is a dehydration request pending.
Orchestrations suspended	Number of orchestration instances suspended since the host instance started.
Orchestrations suspended/sec	Average number suspended per second.
Pending messages	Number of received messages for which receipt has not yet been acknowledged to the message box.
Pending work items	Number of code execution blocks that are scheduled for execution.
Persistence points	Number of times an orchestration instance has persisted its state to the database since the host instance started.
Persistence points/sec	Average number of orchestration instances persisted per second.
Runnable orchestrations	Number of orchestration instances ready to execute.
Running orchestrations	Number of orchestration instances currently executing.
Transactional scopes aborted	Number of long-running or atomic scopes that have been aborted since the host instance started.
Transactional scopes aborted/sec	Average number aborted per second.
Transactional scopes committed	Number of long-running or atomic scopes that have successfully completed since the host instance started.
Transactional scopes committed/sec	Average number committed per second.
Transactional scopes compensated	Number of long-running or atomic scopes that have successfully completed compensation scopes since the application started.
Transactional scopes compensated/sec	Average number compensated per second.

See Also

Engine Performance Characteristics
Scenario 2: Sizing the Tracking Database for Messages in Orchestrations
Measuring Maximum Sustainable Engine Throughput
Measuring Maximum Sustainable Tracking Throughput