Swap Detector: resource.rusage problems

[sragsdale at my-deja.com]

I'm writing a wrapper for a very CPU and RAM hungry program.  Every so
often this program gets a little too hungry and I need to be warned
about it.

Is there any way to get resource statistics on a program WHILE it's
running?  I know that resource.getrusage() can be used to get resource
statistics after a program has finished, but at that point it's too late
for me.

Here's my sample programs that I've been messing around with.
consumer.py just consumes 10 seconds of CPU and increasing amounts of
RAM while reporting its usage, then it exits.  foo.py forks a process,
runs 'consumer' in the child and monitors resource usage in the parent.
It doesn't see the child's resource usage until the child exits.

ObSystemSetups:

1-Python 1.5.2 (#8, Jul 13 1999, 17:39:45) [C] on irix646
  IRIX64 bach 6.5 07201608 IP28

2-Python 1.5.2 (#1, Feb  1 2000, 16:32:16)  [GCC egcs-2.91.66
19990314/Linux (egcs- on linux-i386
  Linux fivefifty 2.2.15-3SGI_39smp #1 SMP Mon Jul 24 08:45:16 EDT 2000
i686 unknown

############### consumer.py #################
import time,resource

ltime = time.time()
foo = ['x'] * 10000
bar = foo[:]
ticks = 0
while 1:
    if time.time() > ltime + 1:
        ticks = ticks + 1
        bar.extend(foo)
        ltime = time.time()
        print "consumer>",resource.getrusage(resource.RUSAGE_SELF)
        print
        if ticks > 10:
            break

#################### foo.py ###################
import resource
import os,sys,time

pid = os.fork()

# original process
if pid:
    # monitor our usage and the use of the children
    while 1:
        # don't use much CPU to do it
        time.sleep(1)
        val = os.waitpid(pid,os.WNOHANG)
        print "1c>",resource.getrusage(resource.RUSAGE_CHILDREN)
        print "1s>",resource.getrusage(resource.RUSAGE_SELF)
        print
        if val[0]:
            print "Done.  Exiting."
            sys.exit(0)

# child process
else:
    os.system("python consumer.py")
    print "2c>",resource.getrusage(resource.RUSAGE_CHILDREN)
    print "2s>",resource.getrusage(resource.RUSAGE_SELF)
    os._exit(0)


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