[Tcl-bugs] [ tcl-Bugs-926164 ] Unacceptable slowdown in fix for 729692

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Bugs item #926164, was opened at 2004-03-30 15:09
Message generated for change (Comment added) made by msofer
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Category: 46. Bytecode Compiler
Group: development: 8.5a2
Status: Open
Resolution: None
Priority: 8
Submitted By: miguel sofer (msofer)
Assigned to: miguel sofer (msofer)
Summary: Unacceptable slowdown in fix for 729692

Initial Comment:
the fix for bug 729692 introduced the new
INST_START_CMD, causing an unacceptable core slowdown. 
Tclbench results attached; summary of slowdowns:
  * 3% in completing the whole suite
  * 5-10% bytecode intensive (loops, base64, klist,
list iterate, ...)
  * 15-20% worst cases (sha1, heapsort).

See some comments on improving performance in the
original bug ticket.

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>Comment By: miguel sofer (msofer)
Date: 2004-05-12 14:44

Message:
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More careful emission of INST_START_CMD and a runtime
peephole optimisation commited. Effect not measured yet.

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Comment By: miguel sofer (msofer)
Date: 2004-03-30 16:32

Message:
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The too frequent calls to Tcl_AsyncReady() are responsible
for 60-70% of the slowdown.
Reverting to the previous model (check now every 64th
instruction, instead of every INST_START_CMD).
Note that this also fixes [Bug 926118].

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