BizTalk Settings Dashboard, Host Page, Resource Based Throttling Tab

 

Use the Resource Based Throttling tab to manage the usage of system resources (such as threads, memory, and database size) by a host instance process.

Use this	To do this	Boundary values	Default value
Host	From the drop-down list, select the host representing the BizTalk Server runtime instances.	-	-
Per CPU Settings		-	-
Threads	Specify the maximum number of threads in the process (per CPU) allowed before the throttling begins.	[0, Maximum value of type Integer)	0
Database connections	Specify the maximum number of database sessions (per CPU) allowed before throttling begins.	1 – Maximum value of type Integer	0
In-process messages	Specify the maximum number of messages delivered to the End Point Manager (EPM) or XLANG that have not been processed. This does not include the messages retrieved from database but still waiting for delivery in the in-memory queue.	1 – Maximum value of type Integer	1000
Internal message queue size	Indicate the size of the in-memory queue. This queue serves as a temporary placeholder for delivering messages. Setting a large value for this parameter may improve low-latency scenarios to some extent since more messages will be proactively retrieved from the MessageBox database for processing. Since the messages in this queue consume memory, setting this parameter to a smaller value may be desirable for scenarios involving large messages in order to avoid memory based throttling of the process. Note: If you modify this value, the host needs to be restarted for the change to take effect.	1 – Maximum value of type Integer	100
Message count in DB	Indicate the total number of messages published by the host instance to the work, state, and suspended queues of the subscribing hosts. The Message count in DB setting also indirectly defines the threshold for a throttling condition based on the number of messages in the spool table or tracking table. If the number of messages in the spool table or tracking table exceeds 10 times this value then a throttling condition will be triggered.	1 – Maximum value of type Integer	50000
Memory Usage		-	-
Global physical	Specify (in percent) the maximum system-wide virtual memory usage allowed before throttling begins.	0: disable 1% – 100% Values > 100% are treated as MBs and can go up to int Max	0
Process virtual	Specify the maximum process memory (in percent) allowed before throttling begins (in percent or megabytes).	0: disable 1% – 100% Values > 100% are treated as MBs and can go up to int Max	25
Spool multiplier	Indicate the factor by which the Message count in DB threshold is multiplied and then compared against the current record count in the spool table. This is done to determine whether the system should throttle on spool table size. If this value is set to 0, spool table size is not used as a consideration for determining a throttling condition.	0-1000	10
Tracking data multiplier	Specify the factor by which the Message count in DB threshold is multiplied and then compared against the current record count in the tracking table. This is done to determine whether the system should throttle on tracking table size. If this value is set to 0, tracking table size is not used as a consideration for determining a throttling condition.	0-1000	10
Limit to trigger GC	Specifies when a .NET garbage collection (GC) is triggered as process memory consumption increases and approaches the threshold. When the memory consumption exceeds this percentage value of the memory threshold, a GC is triggered.	50-100	80
Batch memory threshold	Indicate (in percent) the memory threshold beyond which to throttle the publishing of a batch of messages. The batch memory threshold is computed by multiplying this percentage factor by the Process virtual threshold. If the memory estimated to execute a publishing batch exceeds the batch memory threshold, the batch is subject to process memory based throttling. Otherwise, the batch is exempted from process memory based throttling even when the total process memory exceeds the Process virtual threshold. A value of zero indicates that all publishing batches may be subject to process memory based throttling even if the memory estimated to execute the batch is minimal.	0%-100%	1
Severity		-	-
Memory	Indicate the severity of a process memory triggered throttling condition. Specified in percentage value, this parameter sets the severity of a throttling condition caused when the Process virtual threshold is exceeded.	1 – 1000	500
DB size	Indicate the severity of a database sized triggered throttling condition. Specified in percentage value, this parameter sets the severity of a throttling condition caused when the Message count in DB threshold is exceeded.	1 – 1000	1
Inflight message	Specify the reaction time of throttling when the value for In-process messages exceeds the threshold. This is specified in percentage value and this parameter sets the severity of a throttling condition caused when the value for In-process messages threshold is exceeded.	1 – 1000	75
Restore Defaults	Click to cancel the modifications done and apply the default BizTalk settings.	-	-

See Also

How to Modify Group Settings
How to Modify Host Instance Settings