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limit P ROCESS C ONFIGURATIONS IN T IBCO B USINESSWORKS MAX activati on limit
| Date post: | 19-Jan-2016 |
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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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