This is the workflow of I/O Analysis  [[File:WorkflowioO_analysis_work_flow.png|400px]]  Image Reference: https://software.intel.com/en-us/node/680296  == What is Disk I/O analysis ==  Disk input / output analysis is a platform-wide analysis that monitors the utilization of the disk subsystem, CPU and processor buses. It requires the program to be run as administrator. ---- What it is used for is to identify the imbalances between I/O operations and computational operations, as well as times the latency of the I/O requests. As shown in the model there is multiple types of analysis.  ----Analyze I/O data in System Cache mode  Command Line Arguments: -f out.txt -m c In this mode, the application asynchronously writes records (16 Byte) to the output file, relying on system file cache.  ----Analyze I/O data in System Cache and buffer mode Command Line Arguments: -f out.txt -m b Used to minimized the CPU usage and effectively use the I/O device. It combines the usage of system file cache and user buffer  ----Analyze I/O data in Synchronous user and buffer mode Command Line Argument: -f out.txt -m s Used in the user buffer to further optimize the operation, program is I/O bound  ----Analyze I/O data in Asynchronous user and buffer mode Command Line Argument: -f out.txt -m a  Uses two user buffers and asynchronously submits data to the disk  == Running the I/O Analysis == The being the Disk Input/Output data analysis We must first click on the new analysis button as show in the screenshot below: [[File:Button.JPG|400px]] We then proceed to input analysis target tab which would take us here [[File:Menu display.JPG|400px]] Make sure the check box for inherit settings from visual studio project is unchecked as shown: [[File:Unchecked.JPG|400px]] We then enter in the parameters for system cache mode and then proceed by clicking choose analysis [[File:Click.JPG|400px]] Upon getting to the page click the Disk Input and Output to start the analysis [[File:Menu display 2.JPG|400px]]  The result page should pop up and it should show the summary page [[File:Result 1.JPG|400px]] On this page there is useful information to know whether the program is running efficiently, by opening the CPU time it shows a more detailed timings of how effective the program ran. By looking at these times we can see the I/O wait times within the program. A more in-depth view of this is inside the Platform tab [[File:Result 2.JPG|400px]] In this page we can see where the I/O wait times are within which threads, so we can optimize it. To view more in-depth results we would perform a new analysis with the next commands following the work flow model.