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Let’s look at the corresponding power consumed by the disk during these operations:Īs evidenced in the chart above, the average power during spin-up is significantly greater than the power during actual data transfer (i.e. It is clear that the spin-up time is significantly longer than the seek/latency time. (Platform Specs: Intel® Core™ Duo 2.0GHz, Jamison Canyon* CRB, 2x512MB DDR2, 40GB SATA 5400RPM-2.5’’ mobile, Windows* XP-SP2) Seek Time Ave (ms) While the actual numbers will vary between different drives, this gives a relative idea on the times taken. The following shows the relative time (in milliseconds) involved in these operations, based on the theoretical specification of the SATA drive used. The data is then read and optionally placed in OS file system cache, and copied to the application buffer. Since the angular velocity of the disk is constant, more data can be read from the outermost perimeter of the disk than the inner perimeter in a single rotation.Įvery time a read request is placed by an application, the disk may have to be spun-up first, and the read/write head must be positioned at the appropriate sector. Furthermore, the actual throughput of the system is also dependent on the physical location of the data on the drive. Seek time and rotational latency relates to the time taken by the disk to position the read/write head from its current track to the track and sector where data is to be read/written. RPM is the rate at which a hard drive spins and directly impacts the performance. The performance of a hard disk is related to various factors such as RPM, seek time, rotational latency, and the sustainable transfer rate. Multiple sectors are grouped into clusters, which the operating system efficiently uses to store and manage all files. A hard drive is organized into multiple sectors which are the most basic addressable blocks of storage.
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The sample code provided with this whitepaper consists of an in-house multithreaded prototype to perform bitmap to JPEG conversion, and APIs to detect a fragmented file and defragment it utilizing Native Command Queuing using async I/O.Įxamining methodologies to optimize powerįirst, let’s take a look at some of the characteristics of a hard drive. This paper also provides guidelines on optimizing the power during disk I/O in various usage models along with the power impact. In this whitepaper, we shall analyze the power characteristics of the disk during sequential/random reads and native command queuing, and provide an analysis on file fragmentation and disk thrashing.
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Various applications constantly interact with the disk for read/write operations, and it is imperative that the software behaves in an optimal way to conserve battery power. Mobile users work with battery power, and extending the battery life has always been desirable to increase productivity and enhance user experience. Power characteristics during sequential/random reads and native command queuing, file fragmentation and disk thrashing, and power optimization guidelines
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Go to Intel® Power Gadget article for more details and download access Microsoft* Visual C++ 2010 Redistributable Package (圆4) - if not yet installed on your system, it will automatically be downloaded from Microsoft site when installing Intel® Power Gadget Windows® Server 2008, Windows® Server 2008 RC2 64-bit (server platforms) The Windows® 7 Sidebar gadget component which is automatically installed (except for server OS).
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Set of driver and libraries which access/reads the energy MSR from the processor and then post process the processor energy counter raw data to calculate the power usage in watts and processor frequency Intel® Power Gadget consist of the following components It lets you log the power and frequency measurements and save it in a csv format.
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Provides processor power (Watts) and frequency (MHz) in real-time via graph displayed by the gadget. It is a simple and easy way to monitor energy usage of the processor. The 2nd Generation Intel® Core™ processor family (codename Sandy Bridge) offers an energy counter to estimate the power drawn by the processor and Intel® Power Gadget is utilizing this energy counter and provides an easy way to estimate power consumption of the processor without cumbersome setup.Ĭommon use of Intel® Power Gadget is via Windows® 7 sidebar gadget. It is always a challenge to measure power usage of the processor by software which usually requires special purpose tools or instrumentation along with third party equipment.