JPH11203220A - Measurement method of required transmission time for client/server communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method which does not assume that a telegram transmission time of a job for transmitting a service demand and receiving a response in performance evaluation in a client/server system is matched with a system clock of a client machine and a server machine and measures without using equipment such as a LAN analyzer. SOLUTION: A time from transmission of a service demand to reception of a reply is measured on the side of a client, a time from reception of the service demand to transmission of a reply is measured on the side of a server, these are embedded in a reply telegram and transmitted to a client. By doing this, a difference between the time from the transmission of the service demand to the reception of a reply measured on the client side and the time from the reception of the service demand to the transmission of the reply measured on the server side enables a time to transmit the telegram back and force to be calculated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for evaluating performance in a client / server system, and in particular, in evaluating a transmission time on a network, transmitting a message without assuming that clocks on different machines are synchronized. It relates to a method for measuring time.

[0002]

2. Description of the Related Art In the development of a distributed system, software components constituting the system are often distributed and arranged on a network. When improvement in performance is required in such a system, it is often difficult to identify a bottleneck point and identify points to be improved due to its dispersibility.

From the viewpoint of a designer who creates a distributed application, the performance value inside each application can be observed by introducing a function for outputting a time stamp to the application. In some cases, it may not be enough to find the cause of the neck.

Factors that affect system performance include (1) CPU performance, (2) OS load, (3) network performance, (4) communication control program performance, (5) client application performance, and (6) server application. In particular, regarding network performance and the performance of communication control programs, it is difficult to search for factors that cause performance degradation and ways to avoid them because the internal operation is a black box.

The performance of the communication control program depends on the remote procedure call and object request
Since it depends on how to implement the functions provided by the broker, evaluation and countermeasures must be left to these programs.However, regarding network performance, the capabilities of network devices, connection methods, and various network parameters Since the setting value is greatly affected, the measurement and evaluation of the performance value is important.

Conventionally, the system clocks of a client machine and a server machine are set to coincide with each other, a time when a service request is transmitted on the client side and a time when the service request is received are measured on the server side, and the respective information is integrated. Then, the time required for the transmission processing was measured from the difference.

[0007]

In the conventional method, it is premised that the system clocks of the client machine and the server machine are set in the environment to be measured, but it is not possible to eliminate an error in millisecond units. Since it is difficult and the accuracy of the system clock of each machine may be different, it is difficult to measure the transmission processing time that can be evaluated.

An object of the present invention is to solve such a problem without assuming that the system clocks of a client machine and a server machine are synchronized in an environment to be measured and without using a device such as a LAN analyzer. It is to provide a method for measuring the transmission time.

[0009]

In order to achieve the above object, the present invention measures the time from transmitting a service request on the client side to receiving a response, and receiving the service request on the server side. The time from sending the service request measured on the client side to receiving the response by embedding the measurement time in the response message and sending it to the client And calculating the round-trip message transmission time based on the difference between the time when the service request measured on the server side is received and the time when the response is transmitted.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a flow of processing time between a client and a server in a method for measuring a required transmission time in client-server communication according to the present invention. The transmission time calculated according to the present invention is a round-trip communication in a series of client-server communications from when a server receives a service request transmitted from a client, executes a service, and returns a service response to the client. It was the time it took. As shown in FIG. 1, the turnaround time (101) from the transmission of a service request on the client side to the end of receiving the response, and the turnaround time (101) from the reception of the service request on the server side to immediately before transmitting the response. The difference from the service execution time (102) is calculated on the client side, and this is treated as the round-trip communication required time.

FIG. 2 shows a flow of processing on the client side relating to the method of measuring the required transmission time in the client-server communication of the present invention. FIG. 3 shows the flow of the transmission required in the client-server communication of the present invention. 7 shows a flow of processing on the server side relating to a method of measuring time.

The client creates a service request message (step 201), acquires the address information of the destination server (step 202), and acquires the time from the system clock when the transmission preparation is completed (step 20).
3). Thereafter, a message is transmitted to the server (step 20).
5). In the present embodiment, communication according to the TCP / IP protocol is used, and connection establishment processing is performed prior to transmission of a message (step 204).
The time required for the connection establishment processing is also included in the required transmission time. The client that has completed transmission of the request message enters a response message reception waiting state.

The server is in a standby state in which it can accept the service request. When the service request arrives, the server finishes receiving all the service request messages (step 30).
1) At the time, the time is obtained from the system clock (step 302). After that, the service function is executed (step 30).
3) Then, when the service result is edited as a response message, the time is acquired again from the system clock (step 304). The difference between the time before the service is executed and the time after the service is executed is calculated, embedded in the control header of the response message (step 305), and the response message is returned to the client (step 306).

The client that has received the response message to the service request acquires the time from the system clock at the time when all the response messages have been received (step 206) (step 207), and acquires the time immediately before transmitting the service request. The difference from the time is calculated (step 208).

[0016]

According to the present invention, when measuring the message transmission time for performance evaluation, it is possible to use a device such as a LAN analyzer without adjusting the system clocks of the client machine and the server machine in the environment to be measured. The message transmission time can be measured without the need.

[Brief description of the drawings]

FIG. 1 is a flowchart of the processing time of a client and a server in a method for measuring a required transmission time in client-server communication according to the present invention.

FIG. 2 is a flowchart of processing on the client side relating to a method for measuring a required transmission time in client-server communication according to the present invention.

FIG. 3 is a flowchart of processing on the server side according to the method of measuring the required transmission time in client-server communication according to the present invention.

[Explanation of symbols]

101: turnaround time, 102: service execution time, 103: request message transmission time, 1
04 ... Response message transmission time.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akiyuki Kushima 6-81-Ouecho, Naka-ku, Yokohama-shi, Kanagawa Prefecture

Claims (1)

[Claims] 1. A method for evaluating a message transmission time of a service for transmitting a service request and receiving a response in a client server system, the method comprising: transmitting a service request to a client and receiving a response; A mechanism for measuring time is provided, and on the server side, a mechanism for measuring the time from receiving a service request to transmitting a response and a mechanism for embedding the measured time in a response message and transmitting the response message are provided,
Calculate the round-trip message transmission time based on the difference between the time between sending a service request measured on the client side and receiving a response and the time between receiving the service request measured on the server side and sending a response. A method for measuring the required time for transmission.