[erlang-questions] Murdering Erlang: Interrupting Erlang Processes

Russell King masterofquestions@REDACTED
Tue Jan 22 15:27:02 CET 2008

Thanks.  Actually, this information is in ERTS manual section 1.2.10.  You
always find the answer to your question after you have posted the email.  By
the way, great documentation.

For whatever reason, google search didn't give me anything.  Funny thing is
that I was reading the document 1 day before and my brain automatically
ignored it as irrelevant due to information overload.  Once I start playing
around it in the shell this does seem a valuable info.

Thank you.

On 22 Jan 2008 09:43:31 +0100, Bjorn Gustavsson <bjorn@REDACTED>

> "Russell King" <masterofquestions@REDACTED> writes:
> > Can someone tell me what is y(0),y(1)..,y(4), heap fragment data, number
> of
> > heap fragments,  link list, reductions, stack+heap?
> y(0) and so on are locations on the stack frame. Each location
> contain a value that need to survive a function call.
> Heap fragment data is Erlang terms allocated outside the heap for the
> process by BIFs because there was insufficient room left on the heap.
> In R12B, heap fragments are garbage-collected away as soon as the BIF
> is done, so it is unlikely that the value would ever be non-zero.
> Number of heap fragments - see above, likely to always be zero in R12B.
> Link list - all processes or ports that this process is linked to.
> Reductions - a counter that is incremented for every function call (and
> by some BIFs too). There will be a context switch when the number of
> reductions
> reaches a certain value (currently 2000).
> Stack+heap - the size of the memory block allocated for the heap and
> stack for the Erlang process. The stack and heap grow towards each other.
> /Bjorn
> --
> Björn Gustavsson, Erlang/OTP, Ericsson AB
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