Server connection lost after several interactions #1577
Comments
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Hi @francesco123212 Sorry, I accidentally hit send on the comment before I was ready...and with a half-baked idea. Can you post some APDL that results in the server disconnection? |
here it is @mikerife. I use it for the prediction of the driving force in terms of SIF of a crack in notched plate, so it goes in a loop that changes the length of the crack and its height wrt the symmetry plane. (I have tested the codes on my PC and they are working): #useless for python users
using PyCall
pymapdl = pyimport("ansys.mapdl.core")
mapdl = pymapdl.launch_mapdl(additional_switches="-smp",mode="grpc")
mapdl.run_multiline("""
/clear
!
*set,toll,1e-5
*set,pi,2*asin(1)
!-----------------------------------------------------!
! SCHEMATIC ILLUSTRATION OF THE SPECIMEN !
!-----------------------------------------------------!
! /) alpha
! /_________________________________
! / |
! / |
! | | | hh2 = 7.50
! | | hh1 |
! |____|______|________________________
!
! <----------------LL = 40------------>
!-----------------------------------------------------!
! GEOMETRY PARAMETERS !
!-----------------------------------------------------!
! geometry
*set,rho,0.1
*set,hh1,2.52
*set,hh2,7.50
*set,LL,40
*set,aa_notch,hh2-hh1
*set,alpha2,90 !deg
/prep7
!-----------------------------------------------------!
! ELEMENT TYPE AND MATERIAL PROPERTIES DEFINITION !
!-----------------------------------------------------!
et,1,182 !Plane 4
keyopt,1,1,3 !Simple Enhanced strain formulation
keyopt,1,3,2 !Plane strain
! mp definition
mp,Ex,1,114e3
mp,PRxy,1,.34
!-----------------------------------------------------!
! NOMINAL GEOMETRY WO CRACKS/DEFECTS !
!-----------------------------------------------------!
k,10000,-(hh1+rho)
circle,10000,rho,,,alpha2/2
kDele,10000
kSel,u,loc,y,-toll,toll
*get,tmp1,kp,kpNext(0),loc,x
*set,tmp1,hh2+tmp1
*get,tmp2,kp,kpNext(0),loc,y
allSel
k,,-hh2,tmp2+tmp1
k,,-hh2,LL
k,,,LL
k
*del,tmp1
*del,tmp2
!
*get,n_kp,kp,0,count
*do,i,2,n_kp-1
l,i,i+1
*endDo
lSymm,y,all
numMrg,kp,toll,,,low
!merge lines
kSel,s,loc,y,-toll,toll
kSel,u,loc,x,-toll,toll
lSlK,s
lComb,all,,0
! now reselect all
allSel
aL,all
""")
cSys_crackTip = 11
crackLength = 0.007 #mm
cv_count = 8
elmSizes = [0.0014; 0.0028; 0.0056; 0.0112; 0.0224; 0.0448; 0.0896; 0.1792; 0.3584]
cvSizes = [0.014; 0.0252; 0.0420; 0.0756; 0.1428; 0.2772; 0.5460; 1.0836]
crackHeight = 0
crackOrientation = 0
elmAlongCrack_count = 5
# create the local reference system at crack tip
mapdl.run_multiline("""
ksel,none
lsel,s,loc,x,-hh2-toll,-hh1+toll
wpoffs,,$crackHeight
wprota,,90
lsbw,all
wpcsys,-1,0
*set,x_crackTip,kx(kpnext(0))
*set,y_crackTip,ky(kpnext(0))
allsel
! now move WP at the desired location
wpOffs,x_crackTip,y_crackTip
wpRota,$crackOrientation
wpOffs,$crackLength
! create the local reference system
cSWpla,$cSys_crackTip
! move all back to the origin
csys,0
""")
# create cracks
crackMaker_2D(cSys_crackTip,crackLength,elmAlongCrack_count,cv_count,cvSizes)
cVMesher_2D(cv_count,elmSizes)
#=
apply BCs and solve
=#
mapdl.run_multiline("""
lSel,s,loc,y,LL-toll,LL+toll
sfL,all,pres,-1
lSel,s,loc,y,-LL-toll,-LL+toll
dL,all,0,uy
lSel,s,loc,x,-toll,toll
dL,all,0,symm
allSel
/solu
eqSlv,pCG
solve
/post1
""")
#=
PSM application on the node edge:
step0: create the named selection for the crack tip node
step1: apply PSM and compute for SFIs/N-SIFs at the crack tip/notch tip node
=#
# step0
mapdl.run_multiline("""
! switch to local reference system W origin at crack tip
cSys,$cSys_crackTip
! select crack tip node
kSel,s,loc,y,-toll,toll
kSel,r,loc,x,-toll,toll
! switch back to
cSys,0
cm,Vnotch_tip,kp
allsel
""")
# step 1 (for now a simplified version, only BC I already know the stress at the notch tip!)
mapdl.run_multiline("""
! select the kp of interet (I already know it is one!)
cmSel,s,Vnotch_tip,kp
! select attached kp
nSlK,s
! get ID of the node
""")
nd_ID = int(mapdl.get("tmp","NODE",0,"NXTH"))
sy = mapdl.get("tmp","NODE",nd_ID,"S","Y")where: function cvMaker_2D(cSys_crackTip::Int,cvSize::Number)
mapdl.run_multiline("""
cSys,$cSys_crackTip
wpCSys,-1,$cSys_crackTip
! unselect all lines, areas and kps
asel,none
lsel,none
ksel,none
! create the square control volume
rectng,$cvSize,-$cvSize,$cvSize,-$cvSize
! remove the newly created area only
adele,all
! select the area to be divided by the cv lines and divide
cmSel,all
asel,inve
asbl,all,all
""")
end
function crackMaker_2D(cSys_crackTip::Int,crackLength::Number,elmAlongCrack_count::Number,cv_count::Int,cvSizes::AbstractArray)
#=
create the first control volume and the crack
=#
mapdl.run_multiline("""
! switch to the cSys cSys_crackTip
cSys,$cSys_crackTip
wpCSys,-1,$cSys_crackTip
! unselect all lines and areas
lsel,none
asel,none
! create the square control volume
rectng,$(crackLength/elmAlongCrack_count),-$(crackLength/elmAlongCrack_count),$(crackLength/elmAlongCrack_count),-$(crackLength/elmAlongCrack_count)
rectng,$(cvSizes[1]),-$(cvSizes[1]),$(cvSizes[1]),-$(cvSizes[1])
! delete newly created areas only (not lines and below)
adele,all
asel,all
! divide the area by the newly created rectangles lines
! to obtain the first CV
asbl,all,all
! select the newly created CVs (2!)
asel,s,loc,y,-$(cvSizes[1])-toll,$(cvSizes[1])+toll
asel,r,loc,x,-$(cvSizes[1])-toll,$(cvSizes[1])+toll
! divide the CVs to obtain the crack
wprota,,-90
asbw,all
! geometry manipulations to have redundant edges on the
! crack
wprota,-90,90
lsel,s,loc,y
lsel,r,loc,z,-$(cvSizes[1])+toll,$crackLength
lsbw,all
!
asel,r,loc,y,0,$(cvSizes[1])
agen,2,all,,,,,10,,1
asel,r,loc,z,-$(cvSizes[1]),$(cvSizes[1])
adele,all
asel,s,loc,y,0-toll,$(cvSizes[1])+toll
asel,r,loc,z,10-toll,10+toll
agen,1,all,,,,,-10,,1,1
wprota,180,,90
wprota,,180
!
ksel,s,loc,y,-toll,toll
ksel,r,loc,x,-$crackLength-toll,-toll
ksel,inve
numMrg,kp
asel,s,loc,y,-$(cvSizes[1])-toll,$(cvSizes[1])+toll
asel,r,loc,x,-$(cvSizes[1])-toll,$(cvSizes[1])+toll
! create a named selection for the cracked areas
cm,cracked_ar,area
! go back to the global cSys
cSys,0
! remove unnecessary lines
allsel
lsla,u
ldele,all,1
!
allsel
""")
#=
create further CVs
Here a try catch error could be implemented, printing a warning when error
=#
for i in 2:cv_count
cv_ID = i
cvSize = cvSizes[i]
#=
create the control volume selection
=#
cvMaker_2D(cSys_crackTip,cvSize)
#=
create the named selection
=#
mapdl.run_multiline("""
asel,none
cmSel,all
asel,inve
asel,r,loc,y,-$cvSize-toll,$cvSize+toll
asel,r,loc,x,-$cvSize-toll,$cvSize+toll
cm,cv%$cv_ID%_ar,area
""")
end
mapdl.run_multiline("""
allSel
csys,0
""")
end
function cVMesher_2D(cv_count::Number,elmSizes::AbstractArray)
#=
start meshing the cracked areas (cv0)
=#
mapdl.run_multiline("""
cmSel,s,cracked_ar,area
esize,$(elmSizes[1])
amesh,all
""")
#=
mesh the control volumes now
=#
for i in 2:cv_count
cv_ID = i
elmSize = elmSizes[i]
mapdl.run_multiline("""
cmSel,s,cv%$cv_ID%_ar,area
esize,$elmSize
amesh,all
allsel
""")
end
#=
the rest of the volume
=#
mapdl.run_multiline("""
allsel
!unselect already meshed araes
asel,u,type,,-1
esize,$(elmSizes[end])
amesh,all
allsel""")
end
int(x) = floor(Int,x) |
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I reiterate that the connnection, to my eyes, is lost completely randomly. Sometimes at the 2nd simulation, sometimes at the 20th |
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@FredAns, I think this server connection instability is going to keep coming up until we fix how we're writing output to disk. @francesco123212, whenever possible, either call commands with |
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@akaszynski, thanks for the advice. I tried to go with mapdl.run("save,fileName''db',path")
while true
try
mapdl.run_multiline("""
some APDL commands
""")
break
catch
mapdl = pymapdl.launch_mapdl(additional_switches="-smp",mode="grpc")
mapdl.mute = true
mapdl.run("resume,fileName''db',path")
continue
end
end |
@francesco123212 does this works? |
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Hi @germa89, adding |
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Personally I dont like the solution either. But if it is a server side issue, it will take a while to be solved. |
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Could it be related to my student license? |
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Honestly I don't think so/I hope not! |
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dear @germa89, is it possible that if the code runs into several errors in APDL, then APDL crashes resulting in the loss of the connection? |
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it is very likely that. You should check any error file in the |
Before submitting the issue
pip install --upgrade --upgrade-strategy eager ansys-mapdl-core)Description of the bug
I am running pyAnsys from julia with PyCall, with an ansys student license (2022 R2).
I noticed that when there are several interactions with mapdl the connection might break because APDL crashes and I get the error attached below. The number of
mapdl.some_commandbefore the connection is lost looks to be completely random, sometimes it is in the order of 10, some times in the order of 100/200.The workaround I found is to use a try catch statement which in case of a lost connection will start new mapdl server connection and restore the model from a saved file. It is working, but I'm sure it's not the best solution. The flowchart of the try catch is:
Some notes:
mapdl.run("an APDL command"),mapdl.run_multiline("""some APDL commands"""),mapdl.get("datum from database), could it be an issue? In the MAPDL server connection terminated after error in do loop #544, which was related to *DO loops instability, it was suggested to use the python equivalent for loop. Would it be better to convert all themapdl.run_multiline()in the pyansys equivalent commands?Thankyou all, I hope I haven't written atrocities, I am more of an APDL user than a julia/python user
Steps To Reproduce
Steps:
mapdl.run_multiline("some APDL commands")mapdl.get("some database data")Which Operating System are you using?
Windows
Which Python version are you using?
3.10
PyMAPDL Report
Show the Report!
Installed packages
This is what I get with
Show the installed packages!
```textC:\Users-.julia\conda\3\lib\pkgutil.py:92: UserWarning: The numpy.array_api submodule is still experimental. See NEP 47.
import(info.name)
C:\Users-.julia\conda\3\lib\site-packages_distutils_hack_init_.py:18: UserWarning: Distutils was imported before Setuptools, but importing Setuptools also replaces the
distutilsmodule insys.modules. This may lead to undesirable behaviors or errors. To avoid these issues, avoid using distutils directly, ensure that setuptools is installed in the traditional way (e.g. not an editable install), and/or make sure that setuptools is always imported before distutils.warnings.warn(
C:\Users-.julia\conda\3\lib\site-packages_distutils_hack_init_.py:33: UserWarning: Setuptools is replacing distutils.
warnings.warn("Setuptools is replacing distutils.")
OpenSSL aifc hashlib select
PIL aiohttp heapq selectors
future aiosignal hmac setuptools
_abc antigravity html shelve
_aix_support appdirs http shlex
_ast argparse idlelib shutil
_asyncio array idna signal
_bisect ast imageio site
_blake2 async_timeout imaplib six
_bootsubprocess asynchat imghdr smtpd
_bz2 asyncio imp smtplib
_cffi_backend asyncore importlib sndhdr
_codecs atexit importlib_metadata socket
_codecs_cn attr inspect socketserver
_codecs_hk attrs io socks
_codecs_iso2022 audioop ipaddress sockshandler
_codecs_jp base64 itertools sqlite3
_codecs_kr bdb json sre_compile
_codecs_tw binascii keyword sre_constants
_collections binhex kiwisolver sre_parse
_collections_abc bisect lib2to3 ssl
_compat_pickle brotli linecache stat
_compression builtins locale statistics
_contextvars bz2 logging string
_csv cProfile lzma stringprep
_ctypes calendar mailbox struct
_ctypes_test certifi mailcap subprocess
_datetime cffi marshal sunau
_decimal cgi math symtable
_distutils_hack cgitb matplotlib sys
_elementtree charset_normalizer menuinst sysconfig
_functools chunk mimetypes tabnanny
_hashlib cmath mmap tarfile
_heapq cmd modulefinder telnetlib
_imp code msilib tempfile
_io codecs msvcrt test
_json codeop multidict test_pycosat
_locale collections multiprocessing textwrap
_lsprof colorama netrc this
_lzma colorsys nntplib threading
_markupbase compileall nt time
_md5 concurrent ntpath timeit
_msi conda nturl2path tkinter
_multibytecodec conda_env numbers tlz
_multiprocessing conda_package_handling numpy token
_nsis configparser opcode tokenize
_opcode contextlib operator toolz
_operator contextvars optparse tqdm
_osx_support contourpy os trace
_overlapped copy packaging traceback
_pickle copyreg pathlib tracemalloc
_py_abc crypt pdb tty
_pydecimal cryptography pickle turtle
_pyio csv pickletools turtledemo
_queue ctypes pip types
_random curses pipes typing
_sha1 cwp pkg_resources unicodedata
_sha256 cycler pkgutil unittest
_sha3 dataclasses platform urllib
_sha512 datetime plistlib urllib3
_signal dateutil poplib uu
_sitebuiltins dbm posixpath uuid
_socket decimal pprint venv
_sqlite3 difflib profile vtk
_sre dis protoc_gen_swagger vtkmodules
_ssl distutils pstats warnings
_stat doctest pty wave
_statistics email py_compile weakref
_string encodings pyclbr webbrowser
_strptime ensurepip pycosat wheel
_struct enum pycparser win_inet_pton
_symtable errno pydoc winreg
_system_path faulthandler pydoc_data winsound
_testbuffer filecmp pyexpat wsgiref
_testcapi fileinput pyiges wslink
_testconsole fnmatch pylab xdrlib
_testimportmultiple fontTools pyparsing xml
_testinternalcapi fractions pyvista xmlrpc
_testmultiphase frozenlist queue xxlimited
_thread ftplib quopri xxlimited_35
_threading_local functools random xxsubtype
_tkinter gc re yarl
_tracemalloc genericpath reprlib zipapp
_uuid geomdl requests zipfile
_warnings getopt rlcompleter zipimport
_weakref getpass ruamel_yaml zipp
_weakrefset gettext runpy zlib
_winapi glob sched zoneinfo
_xxsubinterpreters graphlib scipy
_zoneinfo grpc scooby
abc gzip secrets
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