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gh-116772: Cache getenv result in optimizer.c to reduce calls #126439

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gh-116772: Cache getenv result in optimizer.c to reduce calls #126439

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537431e
Cache getenv result in optimizer.c to reduce calls
Wulian233 Nov 5, 2024
5c59297
Update optimizer.c
Wulian233 Apr 29, 2025
f25a357
try fix
Wulian233 Apr 29, 2025
8dace6c
Merge branch 'python:main' into getenv
Wulian233 Apr 29, 2025
acad35f
not safe WIP
Wulian233 Apr 29, 2025
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2024-11-05-19-44-32.gh-issue-116772.jC4dMr.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Cache ``getenv`` result in optimizer.c to reduce redundant calls during
optimization
27 changes: 25 additions & 2 deletions Python/optimizer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1200,6 +1200,28 @@ int effective_trace_length(_PyUOpInstruction *buffer, int length)
}
#endif

static bool uops_optimize_initialized = false;
static bool uops_optimize_flag = false;

static void
initialize_uops_optimize_flag(void) {
if (!uops_optimize_initialized) {
PyInterpreterState *interp = _PyInterpreterState_GET();
char *env_var = Py_GETENV("PYTHON_UOPS_OPTIMIZE");
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@Fidget-Spinner Fidget-Spinner Apr 29, 2025 •
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Can you please do this instead at where we check for PYTHON_JIT ? So in pylifecycle.c.

Set the thread state/interp state there as well.

bool uops_optimize_flag = (env_var == NULL || *env_var == '\0' || *env_var > '0');
if (interp != NULL) {
interp->uops_optimize_flag = uops_optimize_flag;
}
uops_optimize_initialized = true;
}
else {
PyInterpreterState *interp = _PyInterpreterState_GET();
if (interp != NULL) {
uops_optimize_flag = interp->uops_optimize_flag;
}
}
}

static int
uop_optimize(
_PyInterpreterFrame *frame,
Expand All @@ -1208,6 +1230,8 @@ uop_optimize(
int curr_stackentries,
bool progress_needed)
{
initialize_uops_optimize_flag();

_PyBloomFilter dependencies;
_Py_BloomFilter_Init(&dependencies);
_PyUOpInstruction buffer[UOP_MAX_TRACE_LENGTH];
Expand All @@ -1219,8 +1243,7 @@ uop_optimize(
}
assert(length < UOP_MAX_TRACE_LENGTH);
OPT_STAT_INC(traces_created);
char *env_var = Py_GETENV("PYTHON_UOPS_OPTIMIZE");
if (env_var == NULL || *env_var == '\0' || *env_var > '0') {
if (uops_optimize_flag) {
length = _Py_uop_analyze_and_optimize(frame, buffer,
length,
curr_stackentries, &dependencies);
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