I'm mildly surprised by that - a profiler might show some low-hanging
fruit, and/or might show different characteristics when many more
functions are used. However, the primary reason for EnsureDispatch is
for better support of the object model - there's far more context
available and this less chance of upsetting some COM objects - eg, when
`foo.bar` is seen, EnsureDispatch knows for sure that `bar` is a method,
but dynamic dispatch doesn't know if the resulting object is going to be
called or not.
HTH,
Mark
On 2024-04-17 2:07 a.m., Sven Bardos via python-win32 wrote:
Hi,
shouldn't be EnsureDispatch be faster than Dispatch once the code
generation is done?
I've measured it by calling 6000 COM calls like this:
dirpath = Path('C:/Users/sbardos/AppData/Local/Temp/gen_py/3.10/')
if dirpath.exists() and dirpath.is_dir():
shutil.rmtree(dirpath)
app = Dispatch("CT.Application")
job = app.CreateJobObject()
start = timer()
for i in range(2000):
cnt, devIds = job.GetAllDeviceIds()
cnt, sheetIds = job.GetSheetIds()
dev = job.CreateDeviceObject()
end = timer()
print(f"Time ellapsed (late): {end - start}s")
and the ensure Dispatch version:
app = EnsureDispatch("CT.Application")
job = app.CreateJobObject()
start = timer()
for i in range(2000):
cnt, devIds = job.GetAllDeviceIds(None)
cnt, sheetIds = job.GetSheetIds(None)
dev = job.CreateDeviceObject()
end = timer()
print(f"Time ellapsed (early): {end - start}s")
EnsureDispatch is a little bit slower ~4.2s compared to ~4.0s.
If I don't get a performance boost with EnsureDispatch, is there even
a point using it?
Thanks,
Sven
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