Activatio n limit. maximum number of process instances that can concurrently be loaded into memory.

l i m i t

P R O C E S S

C O N F I G U R AT I O N SI N

T I B C O B U S I N E S S W O R K S

M A X

a c t i v a t io n

l i m i t

m a x i m u m n u m b e r o f p r o c e s s i n s t a n c e s t h a t c a n c o n c u r r e n t l y b e l o a d e d i n t o

m e m o r y

M A X J O B S

A C T I V A T I O N L I M I T

o n c e a p r o c e s s i n s t a n c e i s l o a d e d , i t m u s t r e m a i n i n m e m o r y u n t i l i t

c o m p l e t e s

F L O W L I M I T

m a x i m u m n u m b e r o f c o n c u r r e n t l y r u n n i n g p r o c e s s i n s t a n c e t o s t a r t

b e f o r e s u s p e n d i n g t h e p r o c e s s s t a r t e r

Flow Limit Demystified

SYSTEM

fl o w l i m i t t o y o u r r e s c u e

Flow Limit Demystified

SYSTEM

fl o w l i m i t = 1

FLOW_CONTROLLED

FLOW_CONTROLLED state

When a process engine reaches the Flow Limit, it is placed in this state

WHEN?

The process engine can continue executing existing process instances, but new process instances are not allowed.

WHAT?

Leaving FLOW_CONTROLLED state

A process engine leaves this state when the number of

process instances completed is approximately half of the value specified

for the Flow Limit

Specifics : HTTP Receiver

“When Flow Limit is set on a process containing

this starter, the maximum number of incoming requests is limited to

FLOWL IM IT -1”

Recommended Usage

“Use minProcessors and maxProcessors to control the flow of

incoming HTTP requests instead of using the Flow

Limit property”

Max Jobs Demystified

Max Jobs = 5

MEMORY

DISK

Max Jobs Demystified“If you have sufficient system resources and do not expect

incoming events to exceed the limits of your system, specify

Max Jobs as 0 which allows the engine to create an unbounded

number of process instances and eliminates the overhead of

paging”

Activation Limit Demystified

“It is useful if you wish to specify sequential processing of

incoming events or if you want to enforce limited concurrent

execution of process instances”

Effects of configurations

Max Jobs Use Activation Limit Flow Limit

Unlimited number of process instances can be created

and can be concurrently loaded into the memory

Use of Activation limit is ignored when Max Jobs is 0

Effects of configurations

Max Jobs Use Activation Limit Flow Limit

Allows ‘n’ process instances to be created before placing process starter in flow controlled state

No paging of process instances

Use of Activation limit is ignored when Max Jobs is 0

Effects of configurations

Max Jobs Use Activation Limit Flow Limit

Allows ‘n’ process instances to be created before placing process starter in flow controlled state

One process instance is loaded into memory at a timeand kept there until it completes its execution

This guarantees incoming events are processed in the order in which they occur

Effects of configurations

Max Jobs Use Activation Limit Flow Limit

There is no limit on the number of process instances that can be created

One process instance is loaded into memory at a timeand kept there until it completes its execution

This guarantees incoming events are processed in the order in which they occur

Effects of configurations

Max Jobs Use Activation Limit Flow Limit

Allows ‘n’ process instances to be created before placing process starter in flow controlled state

One process instance is loaded into memory at a time

Incoming events can be processed in any order as process instances are not kept in memory until they complete execution

Effects of configurations

Max Jobs Use Activation Limit Flow Limit

There is no limit on the number of process instances that can be created

‘m’ process instances can be loaded into memory at a time and processed concurrently

Ensures limited amount of concurrent processing. Useful when you have limited resources like database connections. Set ‘m’ to a small number, use activation limit. Each loaded process uses a resource until it completes. Once it completes, a new process is loaded and would use the same resource

Effects of configurations

Max Jobs Use Activation Limit Flow Limit

Allows ‘n’ process instances to be created before placing process starter in flow controlled state

‘m’ process instances can be loaded into memory at a time and processed concurrently

Ensures limited amount of concurrent processing. Useful when you have limited resources like database connections. Set ‘m’ to a small number, use activation limit. Each loaded process uses a resource until it completes. Once it completes, a new process is loaded and would use the same resource

Effects of configurations

Max Jobs Use Activation Limit Flow Limit

There is no limit on the number of process instances that can be created

‘m’ process instances can be loaded into memory at a time and processed concurrently

After ‘m’ process instances are created, new process instances are paged to disk. There is no guarantee of the order in which the process instances are executed

Effects of configurations

Max Jobs Use Activation Limit Flow Limit

Allows ‘n’ process instances to be created before placing process starter in flow controlled state

‘m’ process instances can be loaded into memory at a time and processed concurrently

After ‘m’ process instances are created, new process instances are paged to disk. There is no guarantee of the order in which the process instances are executed

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