Memory leak

otbApplication (no leak)

import psutil
import otbApplication as otb

p = psutil.Process()

def process(n=10):
  for i in range(n):
    print(f"RAM: {p.memory_info().rss / 1024 / 1024:.2f} mb")
    bm = otb.Registry.CreateApplication("BandMathX")
    bm.SetParameterStringList("il", ["/data/France_Selfy_Montpellier_MTD_20240910_hd.jpg"])
    bm.SetParameterString("exp", "im1")
    bm.Execute()
    
    si = otb.Registry.CreateApplication("Superimpose")
    si.SetParameterInputImage("inr", bm.GetParameterOutputImage("out"))
    si.SetParameterInputImage("inm", bm.GetParameterOutputImage("out"))
    si.SetParameterString("out", "/data/todel/image.tif")
    si.ExecuteAndWriteOutput()

process()

pyotb (leak)

import psutil
import pyotb

p = psutil.Process()

def process(n=10):
  for i in range(n):
    print(f"RAM: {p.memory_info().rss / 1024 / 1024:.2f} mb")
    bm = pyotb.BandMathX(il="/data/France_Selfy_Montpellier_MTD_20240910_hd.jpg", exp="im1")
    si = pyotb.Superimpose(inr=bm, inm=bm)
    si.write("/data/todel/image.tif")

process()

Comparison

run#	otbApplication	pyotb
1	65.25	249.15
2	1092.00	2200.69
3	1204.98	2376.72
4	1204.79	2538.09
5	1204.94	2713.59
6	1204.34	2875.89
7	...	3051.51
8	...	3213.76
9	...	3388.59

pyotb versions

Version	Bug
2.0.1	yes
1.5.3	yes
1.4.1	yes
1.4.0	no
1.3.3	no
1.3.1	no
1.3.0	no

A priori the bug occurs btw 1.4.0 and 1.4.1