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From: aslam@m.cs.uiuc.edu
Newsgroups: comp.sys.encore
Subject: CPU timing while using EPT - how?
Message-ID: <37500009@m.cs.uiuc.edu>
Date: 18 Oct 89 03:09:00 GMT
Lines: 36
Nf-ID: #N:m.cs.uiuc.edu:37500009:000:1392
Nf-From: m.cs.uiuc.edu!aslam    Oct 17 22:09:00 1989


Gentle readers, I have two inquiries:

1. How can I time programs when using the EPT  (Encore Parallel Threads)?
When I used to use the multi-tasking routines, task_init, task_create etc.,
I used the routines "timer_init" and "timer_get" to time my code. These
are all documented in section 3P of the man pages. EPT provides a much
more comfortable programming environment than the multi-tasking package; I
would like to determine what this comfort is costing me in terms of multi-cpu
times.

2. Is it possible to install an exception handler for memory alloc disasters?
This is when EPT aborts with a trace like the following:

----------------------------------
Memory allocation statistics 
free:	 0 255 122 48 29 0 7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
used:	 0 1 6 16 3 0 1 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
	Total in use: 18512, total free: 18352

THREAD(disaster): pid 30359 (0): out of memory
IOT trap
--------------------------------------------

I always check the value returned by malloc but this disaster seems to happen
while malloc is doing its job. What I would like is that I trap such a
disaster and free memory that I am not using and then continue.

I am using UMAX 4.2, R3.2.0 on a 10 processor Multimax.

Sohail Aslam
Department of Computer Science
University of Illinois
arpa		aslam@cs.uiuc.edu
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