CN101957760A - Method for measuring process execution time - Google Patents
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Abstract
The invention discloses a method for measuring process execution time, which comprises the following steps of: 1, establishing a process model formed by combining and nesting four basic model structures of sequence, cycle, parallel and selection; 2, establishing a queuing system at each resource, and calculating a waiting time density function and a mean value of a single activity instance at a corresponding resource; and 3, finding an innermost layer basic model structure which does not comprise the four basic model structures, judging that the innermost layer basic model structure belongs to one of the four basic model structures, calculating an execution time density function and a mean value thereof, replacing the innermost layer basic model structure by a novel equivalent activity of which the density function and the mean value are shown in the description to form a novel process model, and repeatedly iterating until the novel process model only comprises an activity, wherein the process execution time of an actual service process/workflow is mean execution time of the activity. The method for measuring the process execution time has the advantages of effectively supporting many-to-many relationship occasions of activities and resources and improving the calculation accuracy.
Description
Technical field
The present invention relates to computer technology, infotech and systems engineering field, the assay method of especially a kind of service-oriented process/workflow execution time.
Background technology
" process execution time " is defined as and receives customer service request/process instance to the time of finishing customer service request/process instance, as: the execution time of order processing process is generally defined as from receiving that client's order is to the duration of finishing the transmission of production of client's order or order product in manufacturing environment.Described " process " comprises business procedure or workflow, and time performance optimization (as: shortening the execution time) is one of main content of carrying out business procedure/Workflow optimization, and the computational analysis mensuration process execution time is to carry out the basis that time performance is optimized.
In the prior art, adopt based on several different methods such as graph theory and waiting line theories usually and measure the process execution time.As: Zhang Xiaoguang etc. have proposed to come analytical work to flow through the method for journey model time performance towards the etendue critical path of workflow process structure optimization, Duk-ho Chang, Jin Hyun Son, Haibo Li, Liu Sheng etc. have introduced the M/M/1 of waiting line theory and M/M/C model investigation the resource distribution quantity and the relation of business procedure/workflow execution time of each task in the workflow, improve the PERT/CPM method, proposed the workflow critical path identification and execution time computing method of task under different resource configuration quantity; Usually do not consider resource constraint based on graph theory method, and can only handle a certain class active instance/task based on the common resource of hypothesis of method (role or agency) of waiting line theory, or different resource is handled the stochastic distribution that similar active instance/task obedience is identical, do not consider the support relation of multi-to-multi between activity and the resource, these hypothesis may with hinder to actual complex business procedure/workflow execution time further, accurately describe, analyze and optimize.
Summary of the invention
Can't adaptive act and resource many-to-many relationship occasion, deficiency that precision is lower for what overcome existing process execution time assay method, the invention provides a kind of effective support activities and resource many-to-many relationship occasion, improve the assay method of a kind of process execution time of computational accuracy.
The technical solution adopted for the present invention to solve the technical problems is:
The assay method of a kind of process execution time, described assay method may further comprise the steps:
The first step, set up process model:
Practical business process/workflow is made up of a plurality of activities, forms following four kinds of basic model structures according to the control relation between each activity: order basic model structure, parallel basic model structure, selection basic model structure and the basic model structure that circulates;
Wherein, described control relation comprise order, with bifurcated, with converge or bifurcated or converge and circulate; Parallel basic model structure, selection basic model structure and the basic model structure that circulates are referred to as non-order basic model structure;
The process model of setting up satisfies following rule:
1: one of rule and bifurcated must have one to be complementary with converging, and form a parallel model structure;
Rule 2: one or bifurcated must have one or converge and be complementary, and form a selection or circulation model structure;
3: one non-sequential control modules of rule can be nested in another non-sequential control module, but two non-sequential control modules can not be overlapping;
Satisfying under the situation of above-mentioned rule, is by four kinds of nested process models that form of basic model textural association with practical business process/workflow modeling;
(2)
It is movable set;
It is the set of tie point; Order
Be the set of process model node,
, then
The expression node
The number of preorder node,
The expression node
The number of descendant node;
, if
, node so
Be the fan-out tie point, if
, node so
Be the fan-in tie point;
(5)
It is set movable and resources relationship.
The expression resource
Have the ability/qualification processing activity
Example;
(7)
:
It is a mapping of carrying out probability from the connection arc to the connection arc;
, if
, then
, if
, then
(8)
:
, be a mapping of handling active instance speed from movable and resources relationship to resource, if
,
, resource then
Can the processing activity in the unit interval
The number of times of example be
, note by abridging and be
(9)
:
Be one from movable and the mapping of resources relationship to the task partition coefficient, described Task Distribution rate is to distribute to the probability of corresponding resource after active instance produces; If
,
, then when movable
Example distribute to resource after producing
Probability be
, note by abridging and be
Because an active instance can only be carried out once by a resource, so have:
The expectation implementation rate of node the is defined as process node expectation is carried out when carrying out one time number of times;
If whole basic module expectation implementation rate is
, so order, parallel, select and the four kinds of basic model structures that circulate in being calculated as follows of expectation implementation rate of node:
By activity
With or the fan-in tie point
, or fan-out tie point
In the circulation basic structure of forming, have:
Wherein:
For withdrawing from the round-robin probability,
Be respectively movable
The expectation implementation rate,
Be respectively tie point
The expectation implementation rate;
By activity
With with the fan-out tie point
, with the fan-in tie point
In the parallel basic module structure of forming, have:
, wherein:
Be respectively movable
The expectation implementation rate,
Be respectively tie point
The expectation implementation rate;
By activity
With or the fan-out tie point
, or fan-in tie point
In the selection basic module structure of forming, have:
Wherein:
Be the selection probability,
,
Be respectively movable
The expectation implementation rate,
Be respectively tie point
The expectation implementation rate;
The calculating of second step, single-unit activity execution time:
In practical business process/workflow, the arrival of assignment procedure example is Poisson flow, and resource is handled each obedience negative exponent distribution of movable time, then is modeled as one in each Energy Resources Service
Queuing system calculates the Laplace-Stieltjes conversion that the single-unit activity example distributed in the stand-by period at respective resources place:
The single-unit activity example in the average latency at respective resources place is:
Movable
The density function of execution time be:
The execution time of the 3rd step, whole process model calculates:
3.1) find out an innermost layer basic model structure that does not comprise four kinds of basic model structures
, judge described innermost layer basic model structure
Belong to a kind of in four kinds of basic model structures, calculate according to the computing method of four kinds of basic process model structure execution time
With
3.2) with an execution time density function and average be
With
The movable innermost layer basic model structure of replacing of equivalence, form a new process model;
3.3) judge whether described new process model only comprises an activity? if not, turn back to 3.1), if, the average execution time of whole process model is the average execution time of a described activity, and the average execution time of described whole process model is the execution time of practical business process/workflow.
Further, described step 3.1) in, the computing method of four kinds of basic process model structure execution time are as follows:
(a) order basic model structure:
The Laplace-Stieltjes that the execution time of order basic model structure distributes is transformed to:
The execution time density function of order basic model structure is:
The execution time average of order basic model structure is:
(b) the basic model structure that circulates:
The Laplace-Stieltjes that the execution time of the basic model structure that circulates distributes is transformed to:
The execution time density function of the basic model structure that circulates is:
The execution time average of the basic model structure that circulates is:
(c) parallel basic model structure:
The execution time density function of parallel basic model structure is:
The execution time average of parallel basic model structure is:
When the execution time of activity was similar to obeys index distribution, approximate treatment was as follows:
(d) select the basic model structure:
Select the Laplace-Stieltjes of the execution time distribution of basic model structure to be transformed to:
Select the execution time density function of basic model structure to be:
Select the execution time average of basic model structure to be:
Beneficial effect of the present invention mainly shows: has adopted with respect to existing method based on M/M/1 and M/M/C waiting line system model (1)
Waiting line system model, the effectively analysis optimization of the calculating of business procedure/workflow execution time and timeliness energy under support activities and the resource many-to-many relationship.
(2) with respect to existing graph theory method (as key methodology or improved critical path method etc.), consider resource constraint, can be used for the analysis of distributing rationally of resource; In addition, adopt the execution time of stochastic variable joint distribution Theoretical Calculation parallel model structure to distribute, improved process execution time computational accuracy.
Description of drawings
Fig. 1 is four kinds of basic model structural representations of process.
Fig. 2 is from the abstract process logic structural model synoptic diagram that comes out of manufacturing enterprise's business procedure.
Fig. 3 is the computation process synoptic diagram of process model execution time.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1~Fig. 3, the assay method of a kind of process execution time may further comprise the steps:
The first step, set up process model
1) basic structure of process model
Practical business process/workflow is made up of a series of relevant activities, have between activity and the activity order (Sequence), with bifurcated (AND-Split), with converge (AND-Jion) or bifurcated (OR-Split) or converge (OR-Jion), circulation control relation such as (iteration), can form: in proper order, four kinds of basic model structures such as parallel, selection, circulation, as shown in Figure 1.Three kinds of basic model structures such as wherein, parallel, selection, circulation are called non-order basic model structure.
Order basic model structure: all activities order are successively carried out, except that first with last activity, each activity has only a preorder activity and follow-up activity, after each movable preorder activity was finished, it just can be carried out.
Parallel basic model structure: after an activity is finished, have the activity of a plurality of branches to carry out simultaneously thereafter, after all branch's activities all executed, the movable common follow-up activity of branch can be carried out.
Select the basic model structure: after an activity is finished, have the activity of a plurality of branches to carry out thereafter.But the activity of a plurality of branches is the condition mutual exclusion, has and have only branch's activity to carry out, and after the branch's activity in being elected to executed, the movable common follow-up activity of branch just can be carried out.
Basic model structure circulates: the one or more action needs in the process repeat repeatedly, satisfy up to certain condition.
In order to guarantee that process model has good logical organization, the process model of foundation need satisfy following rule:
1: one of rule and bifurcated must have one to be complementary with converging, and form a parallel model structure
Rule 2: one or bifurcated must have one or converge and be complementary, and form a selection or circulation model structure.
3: one non-sequential control modules of rule can be nested in another non-sequential control module, but two non-sequential control modules can not be overlapping;
Practical business process/the workflow of a corresponding complexity, its process model can be nested to form by these four kinds of basic model textural associations.Because these four kinds of basic model structures have the single export structure of single input, therefore are similar to structured programing design method, all has correct good logical organization by nested satisfied regular 1 ~ 3 any process model that forms of these four kinds of basic model textural associations.
2) formalization of process model
(2)
It is movable set;
It is the set of tie point; Order
Be the set of workflow process model node,
, then
The expression node
The number of preorder node,
The expression node
The number of descendant node;
, if
, node so
Be the fan-out tie point, if
, node so
Be the fan-in tie point.
(5)
It is set movable and resources relationship.
The expression resource
Have the ability/qualification processing activity
Example.
(7)
:
It is a mapping of carrying out probability from the connection arc to the connection arc;
, if
, then
, if
, then
(8)
:
, be a mapping of handling active instance speed from movable and resources relationship to resource, if
,
, resource then
Can the processing activity in the unit interval
The number of times of example be
, note by abridging and be
(9)
:
Be one from movable and the mapping of resources relationship to the task partition coefficient, described Task Distribution rate is to be the probability of distributing to corresponding resource after active instance produces; If
,
, then when movable
Example distribute to resource after producing
Probability be
, note by abridging and be
Because an active instance can only be carried out once by a resource, so have:
3) definition and the calculating of expectation implementation rate
The expectation implementation rate of node the is defined as process node expectation is carried out when carrying out one time number of times.
If whole basic module expectation implementation rate is
, so order, parallel, select and the four kinds of basic model structures that circulate in being calculated as follows of expectation implementation rate of node:
, (1)
Shown in Fig. 1 (b) by activity
With or the fan-in tie point
, or fan-out tie point
In the circulation basic structure of forming, have:
(2)
Wherein:
For withdrawing from the round-robin probability,
Be respectively movable
The expectation implementation rate,
Be respectively tie point
The expectation implementation rate;
Shown in Fig. 1 (c) by activity
With with the fan-out tie point
, with the fan-in tie point
In the parallel basic module structure of forming, have:
Wherein:
Be respectively movable
The expectation implementation rate,
Be respectively tie point
The expectation implementation rate;
Shown in Fig. 1 (d) by activity
With or the fan-out tie point
, or fan-in tie point
In the selection basic module structure of forming, have:
Wherein:
Be the selection probability,
,
Be respectively movable
The expectation implementation rate,
Be respectively tie point
The expectation implementation rate;
Second step, single-unit activity execution time calculate
When the arrival of process example is a Poisson process, and the time that resource is handled each active instance in practical business process/workflow obeys negative exponent and distributes; Then arrival of each movable place example can be similar to and thinks a Poisson process in practical business process/workflow.Adopting under the separate queue situation, the active instance of obeying Poisson process arrives the back and gives corresponding service organization (resource) when handling by probability assignments, then the arrival of the total activity example that need handle of each Energy Resources Service is a synthetic Poisson flow, and resource is handled the time obedience hyperexponential distribution of total activity example, therefore, if set up a queuing system in each Energy Resources Service, this system is one
Queuing system.Can calculate the Laplace-Stieltjes conversion that the single-unit activity example distributed in the stand-by period at respective resources place:
The single-unit activity example in the average latency at respective resources place is:
(8)
The calculating of the 3rd step, whole process model execution time
Practical business process/mensuration of workflow execution time can be converted into the calculating of its process model execution time, and the arthmetic statement of whole process model execution time is as follows:
Algorithm 1: the calculating of whole process model execution time
The step1:IF process model comprises a plurality of movable THEN
Find out an innermost layer basic model structure that does not comprise the basic model structure
, forward step2 to
ELSE/* process model only comprise a movable */
The average execution time of process model
Equal the average execution time of this activity, algorithm stops;
Computing method according to the circulation basic model structure execution time are calculated
With
Calculate according to the computing method of selecting the basic model structure execution time
With
Step3: be with an execution time density function and average
With
Movable this innermost layer basic model structure of replacing of equivalence, form a new process model.
Step4: forward step1 to.
Suppose
With
Be movable
Execution time density function and average, the computing method of four kinds of basic process model structure execution time are:
(a) order basic model structure:
The Laplace-Stieltjes that the execution time of order basic model structure distributes is transformed to:
Wherein:
The execution time density function of order basic model structure is:
The execution time average of order basic model structure is:
(13)
(b) the basic model structure that circulates:
The Laplace-Stieltjes that the execution time of the basic model structure that circulates distributes is transformed to:
(14)
The execution time density function of the basic model structure that circulates is:
The execution time average of the basic model structure that circulates is:
(c) parallel basic model structure:
The execution time density function of parallel basic model structure is:
The execution time average of parallel basic model structure is:
When the execution time of activity was similar to obeys index distribution, approximate treatment was as follows:
(19)
(d) select the basic model structure:
Select the Laplace-Stieltjes of the execution time distribution of basic model structure to be transformed to:
Select the execution time density function of basic model structure to be:
Select the execution time average of basic model structure to be:
Need to prove: in the process of concrete calculating whole process model execution time, by calculating the execution time density function of each activity/module, can accurately calculate the execution time density function and the average thereof of whole process model, if but only need measure average execution time of process model, and every of all parallel modules activity quantity few (as being less than 4) that branch comprises in the process model, and approximate obeys index distribution of the execution time that makes parallel every branch of module, the execution time density function of computational activity/module not in calculating the algorithm of whole process model execution time so, the average that only needs to calculate them gets final product, like this in the workload that guarantees can significantly reduce under the certain precision calculating.
Example: Fig. 2 is the abstract process model logical organization synoptic diagram that comes out of certain manufacturing enterprise's business procedure, and its formal process model may be defined as one 10 tuple
, wherein:
Connect arc set:
The set of activity and resources relationship:
Connect arc and carry out probability:
,
,
,
, it is 1 that all in addition connection arcs are carried out probability.
Handle the time of comings and goings needs according to every kind of resource of historical statistics information and obey the negative exponent distribution.
Can calculate the expectation implementation rate of each activity according to formula (1)-(5), result of calculation is as follows:
,
,
,
,
,
,
Can calculate the average of each movable execution time according to formula (6)-(10), result of calculation is as shown in table 3:
? | a1 | a2 | a3 | a4 | a5 | a6 | a7 | a8 |
The execution time average | 19.21 | 17.02 | 16.07 | 15.82 | 18.23 | 25.05 | 12.05 | 11.09 |
Table 3
According to algorithm 1, the execution time computation process of whole process model as shown in Figure 3, scanning process model (a) is at first selected by node
The innermost layer of forming is selected the basic model structure, calculates its execution time average according to formula (20)-(22) and is: 15.92, use the activity of an equivalence then
Remove to replace a formation new process model (b), then scan the new process model (b) that forms, selection is by node
The innermost loop basic model structure of forming, calculate its average according to formula (14)-(16) and be: 15.06, use the activity of an equivalence then
Remove to replace a formation new process model (c); Then the new process model (c) that forms of scanning is selected by node
The innermost layer of forming is the basic model structure in proper order, calculates its execution time average according to formula (11)-(13) and is: 58.00, use the activity of an equivalence then
Remove to replace a formation new process model (d); Then the new process model (d) that forms of scanning is selected by node
The innermost layer of forming is the basic model structure in proper order, calculates its execution time average according to formula (11)-(13) and is: 33.29, use the activity of an equivalence then
Remove to replace a formation new process model (e); Then the new process model (e) that forms of scanning is selected by node
The parallel basic model structure of the innermost layer of forming, calculate its execution time average according to formula (17)-(19) and be: 70.14, use the activity of an equivalence then
Remove to replace a formation new process model (f); Then the new process model (f) that forms of scanning is selected by node
The innermost layer of forming is the basic model structure in proper order, calculates its execution time average according to formula (11)-(13) and is: 100.44, use the activity of an equivalence then
Remove to replace a formation new process model (f); Then the new process model (f) that forms of scanning because it has only an activity, stops so calculate, and it is movable that the average that process model is carried out equals equivalence
The execution time average, be: 100.44.
Adopt GPSSWorld to carry out emulation, this routine process execution time average is 98.02, and the result of calculation that proposes method with the present invention is very approaching, and the validity of the process execution time assay method that the present invention proposes has been described.
Claims (2)
1. the assay method of a process execution time, it is characterized in that: described assay method may further comprise the steps:
The first step, set up process model:
Practical business process/workflow is made up of a plurality of activities, forms following four kinds of basic model structures according to the control relation between each activity: order basic model structure, parallel basic model structure, selection basic model structure and the basic model structure that circulates;
Wherein, described control relation comprise order, with bifurcated, with converge or bifurcated or converge and circulate; Parallel basic model structure, selection basic model structure and the basic model structure that circulates are referred to as non-order basic model structure;
The process model of setting up satisfies following rule:
1: one of rule and bifurcated must have one to be complementary with converging, and form a parallel model structure;
Rule 2: one or bifurcated must have one or converge and be complementary, and form a selection or circulation model structure;
3: one non-sequential control modules of rule can be nested in another non-sequential control module, but two non-sequential control modules can not be overlapping;
Satisfying under the situation of above-mentioned rule, with practical business process/workflow modeling nested process model that forms of these four kinds of basic model textural associations of serving as reasons;
Described process model is defined as one 10 tuple
, wherein:
(2)
It is movable set;
It is the set of tie point; Order
Be the set of process model node,
, then
The expression node
The number of preorder node,
The expression node
The number of descendant node;
, if
, node so
Be the fan-out tie point, if
, node so
Be the fan-in tie point;
(5)
Be set movable and resources relationship,
The expression resource
Have the ability/qualification processing activity
Example;
(7)
:
It is a mapping of carrying out probability from the connection arc to the connection arc;
, if
, then
, if
, then
(8)
:
, be a mapping of handling active instance speed from movable and resources relationship to resource, if
,
, resource then
Can the processing activity in the unit interval
The number of times of example be
, note by abridging and be
(9)
:
Be one from movable and the mapping of resources relationship to the task partition coefficient, described Task Distribution rate is to distribute to the probability of corresponding resource after active instance produces; If
,
, then when movable
Example distribute to resource after producing
Probability be
, note by abridging and be
Because an active instance can only be carried out once by a resource, so have:
The expectation implementation rate of node the is defined as process node expectation is carried out when carrying out one time number of times;
If whole basic module expectation implementation rate is
, so order, parallel, select and the four kinds of basic model structures that circulate in being calculated as follows of expectation implementation rate of node:
By activity
With or the fan-in tie point
, or fan-out tie point
In the circulation basic structure of forming, have:
Wherein:
For withdrawing from the round-robin probability,
Be respectively movable
The expectation implementation rate,
Be respectively tie point
The expectation implementation rate;
By activity
With with the fan-out tie point
, with the fan-in tie point
In the parallel basic module structure of forming, have:
, wherein:
Be respectively movable
The expectation implementation rate,
Be respectively tie point
The expectation implementation rate;
By activity
With or the fan-out tie point
, or fan-in tie point
In the selection basic module structure of forming, have:
Wherein:
Be the selection probability,
,
Be respectively movable
The expectation implementation rate,
Be respectively tie point
The expectation implementation rate;
The calculating of second step, single-unit activity execution time:
In practical business process/workflow, the arrival of assignment procedure example is Poisson flow, and resource is handled each obedience negative exponent distribution of movable time, then is modeled as one in each Energy Resources Service
Queuing system calculates the Laplace-Stieltjes conversion that the single-unit activity example distributed in the stand-by period at respective resources place thus:
The single-unit activity example in the average latency at respective resources place is:
Movable
The average execution time be:
The calculating of the 3rd step, whole process model execution time:
3.1) find out an innermost layer basic model structure that does not comprise four kinds of basic model structures
, judge described innermost layer basic model structure
Belong to a kind of in four kinds of basic model structures, calculate according to the computing method of four kinds of basic process model structure execution time
With
3.2) with an execution time density function and average be
With
The movable innermost layer basic model structure of replacing of equivalence, form a new process model;
3.3) judge whether described new process model only comprises an activity? if not, turn back to 3.1), if, the average execution time of whole process model is the average execution time of a described activity, and the average execution time of described whole process model is the execution time of practical business process/workflow.
2. the assay method of a kind of process execution time as claimed in claim 1 is characterized in that: described step 3.1), the computing method of four kinds of basic process model structure execution time are as follows:
(a) order basic model structure:
The Laplace-Stieltjes that the execution time of order basic model structure distributes is transformed to:
The execution time density function of order basic model structure is:
The execution time average of order basic model structure is:
(b) the basic model structure that circulates:
The Laplace-Stieltjes that the execution time of the basic model structure that circulates distributes is transformed to:
The execution time density function of the basic model structure that circulates is:
The execution time average of the basic model structure that circulates is:
(c) parallel basic model structure:
The execution time density function of parallel basic model structure is:
The execution time average of parallel basic model structure is:
When the execution time of activity was similar to obeys index distribution, approximate treatment was as follows:
(d) select the basic model structure:
Select the Laplace-Stieltjes of the execution time distribution of basic model structure to be transformed to:
,
Select the execution time density function of basic model structure to be:
Select the execution time average of basic model structure to be:
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2010
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