[squeak-dev] MessageTally problems
Chris Muller
asqueaker at gmail.com
Fri Apr 23 01:29:58 UTC 2010
I am trying to do a very heavy lifting task with Squeak, but it is
taking longer than I think it should. So of course, I used the
profiler, but I just can't make any sense of it. I profiled a huge
operation that took a couple of hours. To do the profile I used:
MessageTally spyAllOn: [ ... my big operation... ]
According to the profile, only 46% of the time was spent doing
anything related to MY stuff, but with 41% of it being in
"primitives"!
46.0% {9799162ms} MauiWorld class>>maui:
46.0% {9799162ms} MauiFamily>>newViewNamed:for:
<--- snip ---->
| 41.2% {8776640ms}
MaFixedObjectBuffer(MaObjectBuffer)>>oid
| 41.2% {8776640ms} primitives
The snipped portion is all my code, zooming down a single tree branch
straight to "primitives". Does this mean the Smalltalk is optimized
to consuming only 5% of the total of everything?
The other 53.9% was spent, here:
--------------------------------
Process: (60) 10116: [] in Delay>>wait
--------------------------------
53.9% {11482061ms} EventSensor>>eventTickler
50.5% {10757775ms} Delay>>wait
|50.5% {10757775ms} primitives
2.5% {532563ms} primitives
What is this??
Is it possible there is something wrong with the profiler? From the
section of the report about garbage-collection, it would appear so:
---------------------------------------------
**Leaves**
50.6% {10779078ms} Delay>>wait
41.2% {8776640ms} MaByteObjectBuffer(MaObjectBuffer)>>oid
2.5% {532563ms} EventSensor>>eventTickler
**Memory**
old +105,090,944 bytes
young +141,708 bytes
used +105,232,652 bytes
free +48,992 bytes
**GCs**
full 34 totalling 20,612,579ms (97.0% uptime), avg 606252.0ms
incr 703603 totalling 18446744070288121880 milliSeconds ms
(8.6594166983905e13% uptime), avg 2.6217546073977e13ms
tenures 2,429 (avg 289 GCs/tenure)
root table 0 overflows
----------------------------------------------
As interesting as
Check out the time for incremental GC's.. Yes, that really is
eighteen quintillion, four hundred forty-six quadrillion, seven
hundred forty-four trillion, seventy billion, two hundred eighty-eight
million, one hundred twenty-one thousand, eight hundred eighty
milliseconds spent doing incremental GC's. That can't be right...
:)
Wait, there's more.
After profiling my operation, the image is just sitting there with the
Spy Results, but the vm was consuming nearly 100% of the CPU. I do
not think this was the sound issue because I have that preference set
to stop playing, and also that the utilization was not so pegged but
dipping down to 95% a bit, I think.
My question: What the hell is Squeak doing?
Again, I try to call upon MessageTally for the answer:
MessageTally spyAllOn: [ (Delay forSeconds: 30) wait ]
What do I get? Nada! (pasted below).
I have a deadline pressing and I'm really stuck on this! The profiler
is an absolutely _essential_ tool. Is my code the problem or is there
a problem with Squeak?
Thank you for any insights!
- Chris
"Nada"
- 29927 tallies, 30016 msec.
**Tree**
--------------------------------
Process: (60) 23304: [] in Delay>>wait
--------------------------------
5.4% {1621ms} EventSensor>>eventTickler
5.4% {1621ms} Delay>>wait
5.4% {1621ms} primitives
--------------------------------
Process: (10) 20578: ProcessorScheduler class>>idleProcess
--------------------------------
94.4% {28335ms} ProcessorScheduler class>>idleProcess
**Leaves**
94.4% {28335ms} ProcessorScheduler class>>idleProcess
5.5% {1651ms} Delay>>wait
**Memory**
old +0 bytes
young -331,640 bytes
used -331,640 bytes
free +331,640 bytes
**GCs**
full 0 totalling 0ms (0.0% uptime)
incr 8 totalling 10,843ms (36.0% uptime), avg 1355.0ms
tenures 0
root table 0 overflows
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