[MI400] AddTrc patches a pgm

["Steve Richter" <srichter@xxxxxxxxxxxxx>]

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I am doing a bit of debugging lately. Using the AddTrc command with the TrcPgm 
parm set to a trace handler I wrote.

I notice that when I AddTrc (*All instructions) and the pgm being traced runs 
very, very slow in a 2nd signon session where debug is not active.  After a bit 
of time is spent examining the code to see why the pgm is running so slow, I 
remember what Leif said months ago re: AddBkp patching the pgm object with 
break stmts.

So when you AddTrc *AllInst, every MI instruction in the pgm object is patched 
with a breakpoint type RISC instruction? And those breakpoint instructions are 
executed by every job on the system that runs the pgm being traced?

Thanks,

Steve Richter


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