[Info-vax] How to obtain percentage of a given CPU consumed by a process

[Paul Sture]

On 2016-06-06, Johnny Billquist <bqt at softjar.se> wrote:
> On 2016-06-04 09:40, lawrencedo99 at gmail.com wrote:
>> On Wednesday, May 25, 2016 at 1:50:16 PM UTC+12, IanD wrote:
>>> I'm looking for a way to find the CPU consumption for a given
>>> process on a given CPU...
>>
>> I remember once I brought a VAX virtually to its knees, while
>> recording almost 0% CPU usage. Ask me how...
>
> Thrash the virtual memory system? That's easy...
> Write a program that just hits one byte on each page, and enough pages 
> to not be in the working set. The machine will be very busy just paging...
>

Configure it to swap rather than page.  That'll bring it to its knees.

-- 
There are two hard things in computer science, and they are cache invalidation,
naming, and off-by-one errors.