有关top中的%hi %si %st

有关top中的%hi %si %st (2009-04-14 11:41)

分类： Linux

hi( Hardware IRQ)cpu,si(Software Interrupts),st(Steal Time)

st,It turns out that this stands for ‘Steal Time’ and is the amount of real cpu that the Xen Hypervisor has allocated to tasks other than running your Virtual Machine.

IBM’s definition of steal time is actually pretty good:

Steal time is the percentage of time a virtual CPU waits for a real CPU while the hypervisor is servicing another virtual processor.

So, relatively speaking, what does this mean?

A high steal percentage may mean that you may be outgrowing your virtual machine with your hosting company. Other virtual machines may have a larger slice of the CPU’s time and you may need to ask for an upgrade in order to compete. Also, a high steal percentage may mean that your hosting company is overselling virtual machines on your particular server. If you upgrade your virtual machine and your steal percentage doesn’t drop, you may want to seek another provider.

A low steal percentage can mean that your applications are working well with your current virtual machine. Since your VM is not wrestling with other VM’s constantly for CPU time, your VM will be more responsive. This may also suggest that your hosting provider is underselling their servers, which is definitely a good thing.