We are having performance problems when running python COM Scripts. The app starts it own internal scripting engine and if we use _vbscript_, everything is fine. If we use PythonScript, the app consumes large amounts of memory (up to 3 GB) and the crashes because it runs out of memory.
This is the (simplified) PythonScript:
=====================================
counter = 0
for AnObject in OurApp.Array():
counter = counter + AnObject.Value()
=====================================
The corresponding _vbscript_:
=====================================
for each AnObject in OurApp.Array()
counter = counter + AnObject.Value()
next
=====================================
This is the (simplified) C++ COM Code:
=====================================
VARIANT COurApp::Array()
{
HRESULT hr;
SAFEARRAY * pSa;
pSa = SafeArrayCreateVector(VT_VARIANT, 0, 100000);
LPVARIANT psadata = NULL;
hr = SafeArrayAccessData(pSa, (void**)&psadata);
if (FAILED(hr)) {
SafeArrayDestroy(pSa);
}
LPDISPATCH t = GetIDispatch(FALSE);
for (unsigned i = 0; i < 100000; ++i) {
psadata[i].pdispVal = t;
psadata[i].vt = VT_DISPATCH;
t->AddRef();
}
hr = SafeArrayUnaccessData(pSa);
if (FAILED(hr)) {
SafeArrayDestroy(pSa);
}
VARIANT rgvar;
VariantInit(&rgvar);
V_VT(&rgvar) = VT_ARRAY|VT_VARIANT;
V_ARRAY(&rgvar) = pSa;
return rgvar;
}
float COurObject::Value()
{
return rand();
}
==========================================
The returned Array can in some cases be very large. For this example, _vbscript_ uses 1,5 Megs and Python uses about 500 Megs of RAM.
I have set breakpoint on malloc and free in the runtime library and have observed that Python calls these functions frequently, which I suspect is part of the problem.
What can we do to optimise our application / script? Any hints / pointers are much appreciated.
Thanks.
--
/Johan.
_______________________________________________ Python-win32 mailing list Python-win32@python.org http://mail.python.org/mailman/listinfo/python-win32
