74 results about "Load generator" patented technology

The invention relates to a performance benchmark test system and method for a big data stream processing framework. The system comprises a streaming load generator, a streaming scenario and application constructor, a performance data collection tool and a performance data analysis tool. The invention selects an application that conforms to the streaming processing mode calculation feature, generates a load that conforms to the streaming processing mode data feature, tests the performance of the big data stream processing framework under typical scenarios and applications, and collects performance indicators such as back pressure, throughput, delay, system resources, and node data during operation. Finally, the bottlenecks of the stream processing framework are diagnosed by analysis and statistics of collected data.

The invention provides a generator test system which comprises a control unit, a detection unit, a tested generator, a direct current motor and a direct current motor driving unit. The system is characterized in that: the system also comprises a load generator, wherein the tested generator, the load generator and the direct current motor are in coaxial connection; output of the tested generator and input of the load motor are connected to provide electric energy input for the load generator; the direct current motor driving unit connects with the direct current motor and is used for driving the direct current motor; the detection unit connects with the tested generator and is used for detecting a parameter of the tested generator; the control unit is used for sending a control signal to the direct current motor driving unit in order to control running of the direct current motor. According to the test system, a power feedback method is employed, electric energy generated by the tested generator in a test process is sent to a generator which is taken as a load of the tested generator, environmental protection is facilitated, system composition is simplified, thus a failure rate is reduced, test accuracy is raised, test cost is reduced, and enterprise competitiveness is enhanced.

A modular sizing fit cycle, having an enclosed, acoustically dampened transmission, and calibrated height and angle adjusters, each designed to fit an individual to a bicycle according to specific measurements attained during a controlled ride. The sizing fit cycle is highly portable, having distinct pieces that facilitate portability. Additionally, the sizing fit cycle is preferably equipped with a quiet, chain and bell-driven transmission at the rear, facilitating accurate measurements via a load generator and providing a realistic simulation of a stable cycling session.

Disclosed is a computer implemented method carried on an IT framework and a relative apparatus including: an orchestrator module; an optimizer module; a configurator module; a load generator module; and a telemetry module. The method includes: identifying tunable parameters representing a candidate configuration for the System Under Test (SUT), and applying the candidate configuration to the SUT using the configurator module; performance testing the SUT to determine a performance indicator; supplying performance metrics to the optimizer module's machine learning model to generate an optimized candidate configuration. The model provides as output, in correspondence of a candidate set of parameters, an expected value of the performance indicator and a prediction uncertainty thereof, used by the optimizer module to build an Acquisition Function used to derive a candidate configuration and by the load generator module to build the test workload. The test workload is computed through the machine learning model.

A method and structure for a multi-workload storage system is disclosed that is adapted to determine if an additional workload can be placed on the storage system. The invention has storage elements and a proxy load generator connected to the storage elements. The proxy load generator is adapted to create a proxy workload based on an additional workload from a potential client. The proxy workload has a reduced duty cycle when compared to a duty cycle of said additional workload. A control server is connected to the storage elements and the proxy load generator. The control server applies the proxy workload to the storage elements during discontinuous time slices.

A device includes a traffic load profile containing information for regulating rates of routing calls and a controller. The controller may be configured to access the traffic load profile, obtain network calls from a traffic load producer, and route the network calls to a system under test based on the traffic load profile.

A method and apparatus for an electro-hydraulic actuator (1) having mechanical feedback provide closed loop control with a high degree of accuracy. The electro-hydraulic actuator (1) includes a current versus load generator (10), a single-stage servomechanism (20, 21, 22, 23), and a device (24, 25, 40, 41) for providing a mechanical feedback force for offsetting an input force (Fsol) of the current versus load generator (10).

The invention discloses an IO performance test method of an SAN storage device. The method comprises the following steps: the storage device creates a plurality of logic unit numbers LUN and respectively mounts the logic unit numbers on a plurality of test clients; an IO performance test tool is installed in a control client, and load generators are installed in the test clients; the control client communicates with the test clients; and the control client configures the load generators through the IO performance test tool, and the load generators executes corresponding IO operations. The invention further discloses an IO performance test apparatus of the SAN storage device. The IO performance test apparatus comprises a LUN creation module, a test tool installation module and a load generator configuration module. According to the IO performance test method and apparatus disclosed by the invention, IO access simulating actual application scenes are concurrently executed on different test clients to obtain a performance test value closer to the actual situation, so that a user can accurately and flexibly select storage devices with different properties according to different applications.

Methods and hardware for combining multiple, independent, wireless station (or user) emulating, load generators into a cluster, which is a group of independent wireless network load emulators working together to provide arbitrarily large, coordinated 802.11 user communities. A single command, control, and reporting mechanism establishes connections to the load generator nodes making up the cluster, distributes work to the nodes, and collects statistical data from the nodes. Alternate routing simplifies the routing of commands, control requests, and requests for statistical results when only a single load generator node is addressed.

The invention provides a novel energy-saving control system of a reversible direct-current transmission test-bed, belongs to a mechanical electrical product, and has two feedback circuits, including a direct-current voltage booster feedback circuit and a line commutated inversion feedback circuit which are formed, taking full-controlled three-phase rectifier circuit, an electric reactor and diodes as the core. Through the adjustment of contravariant angle of the line commutated inverter and the exciting voltage of a load generator, the load generator can feed the electric power back to an electricity grid and directly back to an electric motor; the line commutated inversion feedback circuit uses the line commutated inversion principle to feed a small part of electrical energy generated by the load generator back to an AC electricity grid, the AC electric grid feeds the part of electrical energy back to the electric motor through the rectifier circuit; the direct-current voltage booster feedback circuit uses the direct-current voltage boost principle to feed most of the electric energy generated by the load generator back to the electric motor directly. The invention has good effect in energy saving, high efficiency of electric energy feedback, simple structure, steady operation, convenient control and can reduce the pollution to the AC electricity grid and wiring loss, and is applicable to the test-bed for testing various mechanical products performance and properties.

In order to make it possible to also mount an original exhaust system (10) substantially leading away from the internal combustion engine (2) below the output axle (7) parallel to the extension thereof in a test rig for internal combustion engines (2), the driving engine or load generator (4) is mounted in a suspended manner at a certain vertical distance from the pedestal (1) on a support arrangement (6) mounted thereon, with the input axle (8) being substantially aligned with the output axle (7) of the internal combustion engine (2) that is to be tested, whereby the space from below the interference contour (9) of the driving engine or load generator (4) to the pedestal remains free for the passage of the exhaust system (10).

A spindle motor with a hydrodynamic pressure bearing is disclosed. The spindle motor with a hydrodynamic pressure bearing includes a stator having coils for generating electromagnetic force when electric power is applied to generate rotational driving force, a rotor rotated with respect to the stator and having magnets facing the winding coils, a hydrodynamic pressure generator having a shaft fixed to one of the stator and the rotor and a sleeve spaced apart from the shaft to face the shaft, at least one hydrodynamic pressure generating groove formed in one of the shaft and the sleeve, and at least one bearing load generator generating bearing load when the sleeve contacts the shaft and formed in one of the shaft and the sleeve. The spindle motor optimizes the shape of the sleeve and the shaft such that the spindle motor is stably rotated and vibration and noise can be reduced accordingly.

Provided are a system and method for a performance test in an outside channel combination environment. In an outside channel combination environment including first and second outside-affairs servers in an active-active form, first and second outside channel combination servers, and first and second network devices, a system for a performance test includes: a plurality of test lines connected to one another so that a closed circuit is formed at outputs of the first and second network devices; and at least one load generator for generating loads corresponding to outbound messages to be sent to a plurality of outside authorities, and measuring system performance, wherein: the loads generated by the load generator are sent to the second outside channel combination server via the first outside-affairs server, the first outside channel combination server, the first network device, the test lines, and the second network device, and the second outside channel combination server generates a response message corresponding to the received load, and then sends the response message to the load generator via the second network device, the test lines, the first network device, the first outside channel combination server, and the first outside-affairs server, so that system performance is measured. Thus, a performance test for transmit/receive message can be effectively performed in advance in a newly built outside channel combination environment.