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This article introduces the relevant knowledge of "how multi-user concurrent operations are carried out in LoadRunner Controller". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

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Data: a, B, C

Virtual users: Vuser1, Vuser2, Vuser3

The parameters appear three times in the script and the script iterates three times

Note: the setting of Runtime setting in Controller takes precedence over Runtime setting in VuGen.

How to fetch the next row of data?

Sequential: order in which all virtual users read data tables sequentially

Random: random, all virtual users read data tables in random form

Unique: unique, all virtual users take one value at a time (do not repeat)

When will the data update be completed by accessing the data table?

Each iteration: after each iteration

Each occurrence: parameters for each occurrence

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Sequence

Sequential + Each iteration

In the first iteration, whenever the parameters appear, Vuser1, Vuser2, Vuser3 take A

In the second iteration, whenever the parameters appear, Vuser1, Vuser2, Vuser3 take B

In the third iteration, whenever the parameters appear, Vuser1, Vuser2, Vuser3 take C

Sequential + Each occurrence

The parameters of the Nth iteration are Vuser1, Vuser2, Vuser3 and A for the first time.

The parameters of the Nth iteration are Vuser1, Vuser2, Vuser3 and B for the second time.

The parameters of the Nth iteration are Vuser1, Vuser2, Vuser3 and C for the third time.

Sequential + Once

In the Nth iteration, whenever the parameters appear, Vuser1 take A Vuser2, take B Vuser3, take C.

Random

Random + Each iteration

No matter how many times this parameter is encountered in the Nth iteration, Vuser1 will only take A, B, or C, and this iteration will not be updated.

No matter how many times this parameter is encountered in the Nth iteration, Vuser2 will only take A, B, or C, and this iteration will not be updated.

No matter how many times this parameter is encountered in the Nth iteration, Vuser3 will only take A, B, or C, and this iteration will not be updated.

After 1 iteration, each Vuser extracts data at random.

Random + Each occurrence

The parameters Vuser1, Vuser2 and Vuser3 are randomly selected from A, B and C for the first time in the Nth iteration.

When the parameters Vuser1, Vuser2 and Vuser3 are encountered in the Nth iteration for the second time, one of them is randomly selected from A, B and C.

The parameters Vuser1, Vuser2 and Vuser3 are randomly selected from A, B and C for the third time in the Nth iteration.

Each Vuser continues to re-extract data every time a parameter is encountered during the first iteration of Null.

Random + Once

No matter how many times the parameter is encountered in the Nth iteration, Vuser1 only takes A, or B, or C

No matter how many times the parameter is encountered in the Nth iteration, Vuser2 only takes A, or B, or C

No matter how many times the parameter is encountered in the Nth iteration, Vuser3 only takes A, or B, or C

Each Vuser does not re-extract data after 1 iteration of Null.

Only

Note: when using this Unique type, you must note that there are enough numbers in the data table.

For example, if 20 virtual users are set in Controller for 5 cycles, then the virtual user numbered 1 takes the first five numbers, and the virtual user numbered 2 takes the number from 6 to 10, and so on, so that there must be at least 100 pieces of data in the data table, otherwise an error will be returned during the running of Controller.

So the following example adds data D, E, F, G, H, I to the data table.

Unique + Each iteration

In the first iteration, no matter how many times the parameter appears, Vuser1 takes A Vuser2, D Vuser3 takes G

In the second iteration, no matter how many times the parameters appear, Vuser1 takes B Vuser2, E Vuser3 takes H

In the third iteration, no matter how many times the parameters appear, Vuser1 takes C Vuser2, F Vuser3 takes I.

Unique + Each occurrence

The parameter Vuser1 appears for the first time in the first iteration, taking A Vuser2, D Vuser3, G

The parameter Vuser1 appears in the first iteration and the second time, take B Vuser2, take E Vuser3, take H

The parameter Vuser1 appears in the first iteration and the third time, take C Vuser2, take F Vuser3, take I.

Unique + Once

No matter how many iterations are carried out, no matter when the parameter appears, Vuser1 takes A Vuser2, B Vuser3 takes C

Data D, E, F, G, H, I are not taken.

Reference: http://bbs.51testing.com/thread-205680-1-1.html

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