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As battery life in most laptops is naturally limited to a few hours, is there any way to know how much battery a process (i.e. Microsoft Word or GNS.exe) is using? Like process A is using this much amount of battery... As far I know GDI32.dll in Win32 API is responsible for delivering display (icons, menu etc) on screen. Please help me as I want to take this topic as my case study.

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I think the level of battery power consumption is proportional to processor time usage by specific process. Unless you are trying to crack MD5/NTLM hashes with GPU , otherwise there is no need to distinguish the battery usage and processor usage. Please explain the aim in detail. – mnmnc Dec 27 '12 at 14:50
@mnmnc Thanks for comment... My aim is to make a application like process explorer...which will tell in depth info about process with battery consumption...this will help the user to have control over battery usage( process A consumes more battery,he can kill a process to save some battery) – Amar Myana Dec 27 '12 at 19:03
up vote 3 down vote accepted

There is no direct process <-> battery life relationship, the thing that uses battery life up (that could be associated with a process) are side effects of the process running. Here is a list of things that I could come up from the top of my head.

  • CPU - The CPU is a constant draw of power in your system. Many laptops will slow/shut down parts of the CPU to save battery life but if a program has a high CPU % the processor will never be able to go in to that low power state
  • GPU - The GPU is a bigger draw than the CPU but is not used most of the time. If the program has any kind of 3D it may increase the batter drain
  • Hard Disk access - If you are using a spinning disk HDD it takes energy to spin up from idle that platter. If a program has a lot of I/O to the disk or causes the swap file to be read from a lot that can drain your battery.
  • DVD Drive access - The DVD drive has motor just like the HDD and will spend energy just the same. It also has a low power laser that needs to be run which also contributes a small power draw.
  • Network Card - The network card also takes a bit of power to function, if you're constantly downloading it can't go into low-power state either. (Thanks Thomas)

This list likely is missing some things that could contribute, but as I said, it came from the top of my head.

For the measuring aspect you can use Windows Event Tracing to monitor all of the above items on my list on a per process basis and generate reports to find out what is using each reasource

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I think the network card also takes a bit of power to function, if you're constantly downloading it can't go into low-power state either. – Thomas Dec 27 '12 at 15:47
@Scott Thank You for your comment... It was knowledgeable comment...sure ill try..if you get any info about this topic..please inform would be helpful. – Amar Myana Dec 27 '12 at 19:13

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