Author: Armin Rigo <ar...@tunes.org>
Branch: counter-decay
Changeset: r50748:85efaef762fb
Date: 2011-12-20 09:41 +0100
http://bitbucket.org/pypy/pypy/changeset/85efaef762fb/
Log: A minimal version of counter decaying.
diff --git a/pypy/jit/metainterp/warmstate.py b/pypy/jit/metainterp/warmstate.py
--- a/pypy/jit/metainterp/warmstate.py
+++ b/pypy/jit/metainterp/warmstate.py
@@ -151,6 +151,7 @@
# counter == -2: tracing is currently going on for this cell
counter = 0
dont_trace_here = False
+ extra_delay = chr(0)
wref_procedure_token = None
def get_procedure_token(self):
@@ -315,6 +316,36 @@
#
assert 0, "should have raised"
+ def bound_reached(cell, *args):
+ # bound reached, but we do a last check: if it is the first
+ # time we reach the bound, or if another loop or bridge was
+ # compiled since the last time we reached it, then decrease
+ # the counter by a few percents instead. It should avoid
+ # sudden bursts of JIT-compilation, and also corner cases
+ # where we suddenly compile more than one loop because all
+ # counters reach the bound at the same time, but where
+ # compiling all but the first one is pointless.
+ curgen = warmrunnerdesc.memory_manager.current_generation
+ curgen = chr(intmask(curgen) & 0xFF) # only use 8 bits
+ if we_are_translated() and curgen != cell.extra_delay:
+ cell.counter = int(self.THRESHOLD_LIMIT * 0.98)
+ cell.extra_delay = curgen
+ return
+ #
+ if not confirm_enter_jit(*args):
+ cell.counter = 0
+ return
+ # start tracing
+ from pypy.jit.metainterp.pyjitpl import MetaInterp
+ metainterp = MetaInterp(metainterp_sd, jitdriver_sd)
+ # set counter to -2, to mean "tracing in effect"
+ cell.counter = -2
+ try:
+ metainterp.compile_and_run_once(jitdriver_sd, *args)
+ finally:
+ if cell.counter == -2:
+ cell.counter = 0
+
def maybe_compile_and_run(threshold, *args):
"""Entry point to the JIT. Called at the point with the
can_enter_jit() hint.
@@ -329,19 +360,9 @@
if n <= self.THRESHOLD_LIMIT: # bound not reached
cell.counter = n
return
- if not confirm_enter_jit(*args):
- cell.counter = 0
+ else:
+ bound_reached(cell, *args)
return
- # bound reached; start tracing
- from pypy.jit.metainterp.pyjitpl import MetaInterp
- metainterp = MetaInterp(metainterp_sd, jitdriver_sd)
- # set counter to -2, to mean "tracing in effect"
- cell.counter = -2
- try:
- metainterp.compile_and_run_once(jitdriver_sd, *args)
- finally:
- if cell.counter == -2:
- cell.counter = 0
else:
if cell.counter != -1:
assert cell.counter == -2
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