Multithreading, Race condition's trouble | ghPython parallel modules + SurfaceMorph

if not using paralle modules ....

if using paralle modules ....

why this...

please help me !!

****************

import ghpythonlib.components as ghcomp
import ghpythonlib.parallel

model = []

def SrfMorph(myS):
result = ghcomp.SurfaceMorph(G,R,myS,U,V,W)
if result:
return result

if parallel:
model = ghpythonlib.parallel.run(SrfMorph, S, True)
else:
model = ghcomp.SurfaceMorph(G,R,S,U,V,W)

****************

Attachments:

test.3dm, 262 KB
test.gh, 21 KB

Replies to This Discussion

Permalink Reply by djordje on February 21, 2015 at 3:51am

Hi Shuta,

I guess it's a bug of some sort.
Interestingly the problem goes away when you graft the "S" input.

Permalink Reply by Shuta TAKAGI on February 21, 2015 at 4:17am

Hi djordje

thx for your advice!

but,

if graft the "S" input...

the component run as "single thread"...

Permalink Reply by djordje on February 21, 2015 at 5:21am

Having higher component's run time in parallel mode, than in single thread mode, is not an indication that parallel mode is running in single thread mode too.
The reason why you might have higher time if you graft the "S" input is because parallel.run function is meant to be used with single lists (being that a python regular list or a list from a single branched grasshopper tree), or python's lists of lists. When you graft "S" input, you get a data tree with several branches, with one list on each of those branches. Because of this parallel.run then needs to take one list at a time, and an item from that list, which results in much higher component run time.

I reported the problem at ghpython's github issues page.

Permalink Reply by Shuta TAKAGI on February 22, 2015 at 12:39pm

thx!

Permalink Reply by 筑梦NARUTO on February 21, 2015 at 4:40am