Abstract: Techniques are described for adaptive sampling qualification for extinction ration control. The techniques may be implemented in a laser driver assembly which includes a laser driver and a sampling loop configured to facilitate sampling of photodiode current produced by a monitor photodiode (MPD) of an optical transmitter assembly. The sampling loop comprises a low pass filter with reset, a digital-to-analog converter (DAC), and a comparator. The filter receives transmit (Tx) data provided to the laser driver and generates an output corresponding to a number of consecutive bits of a first type received in the transmit (Tx) data. The filter resets the output when a bit of a second type is received. The digital-to-analog converter (DAC) outputs a threshold signal. The comparator compares the output from the low pass filter and the threshold signal, and outputs a signal indicating when the photodiode current is to be sampled.

Abstract: Techniques are described for adaptive sampling qualification for extinction ration control. The techniques may be implemented in a laser driver assembly which includes a laser driver and a sampling loop configured to facilitate sampling of photodiode current produced by a monitor photodiode (MPD) of an optical transmitter assembly. The sampling loop comprises a low pass filter with reset, a digital-to-analog converter (DAC), and a comparator. The filter receives transmit (Tx) data provided to the laser driver and generates an output corresponding to a number of consecutive bits of a first type received in the transmit (Tx) data. The filter resets the output when a bit of a second type is received. The digital-to-analog converter (DAC) outputs a threshold signal. The comparator compares the output from the low pass filter and the threshold signal, and outputs a signal indicating when the photodiode current is to be sampled.

Abstract: A system and method for monitoring resource usage in a software system such as a database system is described. The user selects an application to monitor through a user-interface. On selection, one or more first-level statement groups associated with the application are displayed and run-time data for at least one of the displayed first-level statement groups is displayed. Illustrative run-time data indicating resource usage include the amount of processor time used to execute a first-level statement group. The user may then select a first-level statement group so that at least one second-level statement group associated with the selected first-level statement group is displayed, including various run-time data. When the selected application is a database application, a user may review run-time information associated with the execution of database packages, sections and individual SQL statements, including dynamic SQL statements.

Abstract: A system providing precise determination of resource use within a software system such as a database system. A user, such as a database administrator, operates a user interface to select and analyze portions of an application for resource use. In one embodiment in a DB2 database system individual SQL statement resource use can be determined. The invention is capable of uniquely identifying even dynamic SQL statements (i.e., Equalized I.D). Prediction information is presented for when a query, or other database task, will end based on selectable parameters such as optimizer cost, estimated cardinality, and delta delivery rates of data. A user can create or select event monitors to acquire statistical data on a database task. The results of activating the event monitor are presented to the user such that the user can progressively examine portions of an application, package, section and even individual statements.