O.reset() does not free memory

[Klaus Thoeni]

O.reset() does not free the memory, i.e. if you run a series of simulations in a loop the memory usage is accumulating. Here is a script which reproduces the issue (it should affect all versions):

# -*- coding: utf-8
import subprocess

numberTests = 10

for z in range(numberTests):

 O.reset()

 O.bodies.append(pack.regularHexa(pack.inSphere((Vector3(0.0,0.0,0.0)),0.5),radius=0.01,gap=0))
 print "number of bodies:", len(O.bodies)

 cmd = "ps -o vsz -p `pgrep yade` | grep -v VSZ"
 process = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)
 meminfo = process.communicate()[0].strip()
 print "Yade memory usage: ", meminfo, "kB"

 cmd = "egrep 'MemFree' /proc/meminfo"
 process = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)
 meminfo = process.communicate()[0]
 print meminfo

sys.exit(0)

[Alexander Eulitz [Eugen] (kubeu)]

I can confirm this bug.
Some time ago I wrote a (python) script which calls yade for performing a sphere drop with changing parameters. IN this script yade way invoked once and after a sphere drop was finished simulation was reset for the next parameter set. It ended up in about 30.000 parameter combinations that were simulated. This took about 5 days and at the end 128 GB Ram plus the same for Swap file was used...

[Anton Gladky (gladky-anton)]

I tihnk this bug has same roots as LP:1041084 [1].

[1] https://bugs.launchpad.net/yade/+bug/1041084

[Klaus Thoeni (klaus.thoeni)]

Hi Anton,

you are right, changing the script as follows has the same effect:

# -*- coding: utf-8
import subprocess

numberTests = 10

for z in range(numberTests):
 #O.reset()

 bodies= O.bodies.append(pack.regularHexa(pack.inSphere((Vector3(0.0,0.0,0.0)),0.5),radius=0.01,gap=0))
 print "number of bodies:", len(O.bodies)

 for b in bodies:
  O.bodies.erase(b)

 cmd = "ps -o vsz -p `pgrep yade` | grep -v VSZ"
 process = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)
 meminfo = process.communicate()[0].strip()
 print "Yade memory usage: ", meminfo, "kB"

 cmd = "egrep 'MemFree' /proc/meminfo"
 process = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)
 meminfo = process.communicate()[0]
 print meminfo

sys.exit(0)

[Janek Kozicki (cosurgi)]

moved from https://bugs.launchpad.net/yade/+bug/1290194 to https://gitlab.com/yade-dev/trunk/issues/8