Prim error returns (was Re: [squeak-dev] The Primitive: I am not
a number- I am a named prim! - SqueakPeople article)
John M McIntosh
johnmci at smalltalkconsulting.com
Wed Jul 2 16:07:27 UTC 2008
On Jul 2, 2008, at 7:06 AM, Eliot Miranda wrote:
> Something that *could* be in the VM is accounting of how much space
> a process consumes. Add a slot to each process known to the VM
> called e.g. slotsAllocated. The VM computes the slots allocated
> between context switches. This is cheap to compute because it can
> compute how much space was allocated since the last garbage
> collection or process switch simply by subtracting the allocation
> pointer at the end of the previous GC or process switch from the
> current allocation pointer. The slots allocated since the last
> process switch is added to the slot in the old process and the slots
> allocated count zeroed on each context switch. We then have an
> accurate measure of how much space each process has allocated.
Ya, there is exactly one place in the VM where the processor switch
happens. In the past I tinkered with it to add some slots to Process
to track wall clock time by process.
At that time was I was thinking gee we could count bytes allocated and
other things like socket usage etc, thus providing a bit more process
consumption statistical data for
Squeak threads ala unix processes.
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John M. McIntosh <johnmci at smalltalkconsulting.com>
Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com
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