Are you ready for Windows 7?

"Hold the line!" That's the new rallying cry for the core Windows development team. Add new features. Tweak existing ones. But whatever you do, don't make Windows 7 any slower or fatter than Vista. [ Monitor your own Windows performance with the new Windows Sentinel tools from InfoWorld. ] I have little doubt those are the marching orders for Windows 7, given the tight release timeframe of 18 to 24 months plus v

Enter the Windows Sentinel project. With nearly 2,000 contributing systems, the exo.repository –- which is the heart of Windows Sentinel –- provides us with a representative sample of Windows-based systems running a mixture of versions (XP, 2003, Vista, 2008) and workloads (business productivity, analytics, home/personal).

Basically, we have our finger on the pulse of the Windows landscape. And by measuring that pulse, plus a few other metrics (and some educated guessing), we can tell a lot about how Windows 7 will be received when it ships.

For example, we can tell right now that roughly 29 percent of current systems will be able to run Windows 7, although not always with adequate performance.

This conclusion is based on an analysis of system disclosure data (CPU type/count/speed, memory size) as well as performance indices calculated from runtime data collected over a one-month period. Of the remaining systems, 60 percent have too little memory (less than 2GB) to reasonably host a Vista successor, while 29 percent don't have the CPU horsepower (less than 2GHz).

We can further break down the "survivors" by analyzing their current workloads. A full 36 percent of them are already CPU bound, with 27 percent of them heavily overloaded. This is per the exo.repository's Peak CPU Saturation Index, which is a compound index derived from 4 contributing factors: Processor Queue Length; Per-process Instant Delay (a custom CPU metric derived from the Processor Queue value); Per-Process Cumulative Delay (another custom metric); and Event Duration.

Interestingly, of the systems that are most heavily burdened, only 31 percent are running Vista (which is not really surprising since Vista makes up just 16 percent of the overall sample set). The rest are running a mixture of XP and Server 2003/XP-64-bit.

Needless to say, a heavily loaded (in terms of CPU saturation) XP box doesn't bode well for Vista's successor. Like Vista, Windows 7 will introduce a much higher CPU burden in the form of additional background services and their corresponding execution threads. Currently, this ratio runs approximately two to one in favor of Vista: A Vista-based PC must juggle roughly twice as many concurrent execution threads as an XP PC while running the identical office productivity workload (see Fat, Fatter, Fattest: Microsoft's kings of bloat for more details).