Via a request from David Röthlisberger
I've updated the special VM I had created to do message logging it's
found via the experimental folder, in folder MessageLoggingVM
on my .mac idisk or ftp from
http://www.smalltalkconsulting.com/squeak.htmlSqueak 3.8.18beta3UXXX.app.zip
This special VM based on the 3.8.18b3 carbon VM that logs the call
stack on each message send. Because logging occurs at
VM message send time it gives a very accurate picture of what the
image is doing, and also generates gigabytes of data.
Once you load the programming api change sets, usage is:
Smalltalk setVMStatsTraceMessageSendLevels: 1.
to set message send recording on. Note that you pass an integer so
you can say
Smalltalk setVMStatsTraceMessageSendLevels: 5.
to set the number of levels in the call stack to print to 5.
Smalltalk setVMStatsTraceMessageSendLevels: 0.
turns the recording off, and closes the file, the file is always
opened truncated writing.
b) Or a kill signal to turn recording on/off and alter recording levels.
kill -USR1 19278 {Pick a squeak VM process id}
kill -USR1 19278 {increment the level by one, go to 2}
kill -USR1 19278 {increment the level by one, go to 3}
kill -USR2 19278 {turn recording off, and close the file}
As a reminder David T Lewis also provided change sets to allow the
interfacing to OSProcess
if you wish to rebuild a VM with this feature and use OSProcess for
more control.
> VMStatsTraceControl-dtl
>
> Add VMStatsTraceControl to provide the signal handlers for SIGUSR1 and
> SIGUSR1 controlling VM stats log. Sending a SIGUSR1 signal to the
> Squeak
> process increments the logging level, and SIGUSR2 disables logging and
> closes the file.
>
> Requires OSProcess for the signal handling (but relevant methods can
> be
> copied into VMStatsTraceControl if you don't want to require OSP). The
> signal handling primitive is in OSPP, currently distributed with the
> Unix VM, or load OSProcessPlugin from SqueakMap.
>
>
> VMStatsInterpreterChanges-dtl
>
> Interpreter changes to accompany VMStatsTraceControl-dtl. This removes
> the SIGUSR1 and SIGUSR2 signal handlers from the interpreter so they
> can be handled in the image.
>
> Load this after JMMRecordMsgSends and JMMRecordMsgSendInterface.
> Also load VMStatsTraceControl-dtl.
>
> Interpreter changes:
> - Removed #cCode: (interrupt handlers) from
> Interpreter>>initVmStatsTraceMessageSendLevels.
> - Added Add Interpreter>>primitiveGetVMStatsTraceMessageSendLevels.
> - Added SystemDictionary>>getVMStatsTraceMessageSendLevels
> - Fixed assignment bug in
> Interpreter>>primitiveSetVMStatsTraceMessageSendLevels (change '='
> to ':=').
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John M. McIntosh <
[hidden email]>
Corporate Smalltalk Consulting Ltd.
http://www.smalltalkconsulting.com=
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