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Enable fan-in heuristics at high opt, reduce method size threshold from 50 to 30 for all opt levels #22834

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Enable fan-in heuristics at high opt, reduce method size threshold from 50 to 30 for all opt levels #22834

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b3f7fcd
Enable fan-in inlining heuristics at high opt
ymanton Sep 5, 2025
9a53761
Reduce fan-in min bytecode size threshold
ymanton Oct 27, 2025
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2 changes: 1 addition & 1 deletion runtime/compiler/control/J9Options.cpp
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Expand Up @@ -196,7 +196,7 @@ int32_t J9::Options::_maxIprofilingCount = TR_DEFAULT_INITIAL_COUNT; // 3000
int32_t J9::Options::_maxIprofilingCountInStartupMode = TR_QUICKSTART_INITIAL_COUNT; // 1000
int32_t J9::Options::_iprofilerFailRateThreshold = 70; // percent 1-100
int32_t J9::Options::_iprofilerFailHistorySize = 10; // percent 1-100
int32_t J9::Options::_iprofilerFaninMethodMinSize = 50; // bytecodes
int32_t J9::Options::_iprofilerFaninMethodMinSize = 30; // bytecodes

int32_t J9::Options::_compYieldStatsThreshold = 1000; // usec
int32_t J9::Options::_compYieldStatsHeartbeatPeriod = 0; // ms
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3 changes: 2 additions & 1 deletion runtime/compiler/optimizer/InlinerTempForJ9.cpp
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Expand Up @@ -2971,7 +2971,8 @@ TR_J9InlinerPolicy::adjustFanInSizeInWeighCallSite(int32_t& weight,

INLINE_fanInCallGraphFactor is an integer number divided by 100. This allows us to avoid using float numbers for specifying the factor.
*/
if (comp()->getMethodHotness() > warm)
static bool disableFanInAtHighOpt = feGetEnv("TR_disableFanInAtHighOpt") != NULL;
if (disableFanInAtHighOpt && comp()->getMethodHotness() > warm)
return;

uint32_t thresholdSize = (!comp()->getOption(TR_InlinerFanInUseCalculatedSize)) ? getJ9InitialBytecodeSize(callee, 0, comp()) : size;
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