# Isfile() for JLD2 appears to be giving segmentation faults / bus errors on a computer cluster

**URL:** <https://discourse.julialang.org/t/isfile-for-jld2-appears-to-be-giving-segmentation-faults-bus-errors-on-a-computer-cluster/113019>\
**Category:** General Usage\
**Tags:** bug, filesystem\
**Created:** [April 16, 2024, 2:23pm UTC](https://discourse.julialang.org/t/isfile-for-jld2-appears-to-be-giving-segmentation-faults-bus-errors-on-a-computer-cluster/113019 "2024-04-16T14:23:05Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![andrewkhardy](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/andrewkhardy/32/27311_2.png) [@andrewkhardy](https://discourse.julialang.org/u/andrewkhardy)\
**Post date:** [April 16, 2024, 2:23pm UTC](https://discourse.julialang.org/t/isfile-for-jld2-appears-to-be-giving-segmentation-faults-bus-errors-on-a-computer-cluster/113019/1 "2024-04-16T14:23:05Z")

</div>

I’m posting a question because I’m not sure if I’m making a silly mistake, or if there’s something a bit more subtle going wrong.

I am running a Julia script on a HPC cluster. One aspect of this script is that it checks to see if it’s already completed the job and saved a .jld2 file before running as a checkpoint.

```julia
file = output_loc * string(input) * "_final.jld2"
if isfile(file)
    println("Output file already exists at $(file)")
else

```

I have also tried with `ispath()`. Somewhere between 10-20% of the jobs submitted crash. When they are restarted they run fine, although this number 10-20% stays consistent until eventually all the jobs run fine.

The error I receive points to the isfile() line.

```julia
[29188] signal (7.2): Bus error
in expression starting at /gpfs/fs1/home/a/t_J.jl/VUMPS/run.jl:40
unsafe_store! at ./pointer.jl:146 [inlined]
unsafe_store! at ./pointer.jl:146 [inlined]
jlunsafe_store! at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/JLD2.jl:51 [inlined]
jlunsafe_store! at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/misc.jl:15 [inlined]
_write at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/mmapio.jl:190 [inlined]
jlwrite at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/misc.jl:27 [inlined]
write_object_header_and_dataspace_message at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/datasets.jl:596
write_dataset at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/datasets.jl:574
jfptr_write_dataset_12158 at /scratch/a/aparamek/andykh/julia-depot-x86_64/compiled/v1.10/JLD2/O1EyT_F9htY.so (unknown line)
write_dataset at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/datasets.jl:653
write_ref at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/datasets.jl:656 [inlined]
WriteDataspace at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/dataspaces.jl:53
unknown function (ip: 0x2ab8f46bf9e1)
... 

```

This error message seems to imply that it’s trying to open the JLD2 file, but I do not understand how this is the case, as there’s no reading or writing involved.

---

<div class="post-metadata">

**Author:** ![mkitti](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mkitti/32/12459_2.png) [@mkitti](https://discourse.julialang.org/u/mkitti)\
**Post date:** [April 16, 2024, 3:06pm UTC](https://discourse.julialang.org/t/isfile-for-jld2-appears-to-be-giving-segmentation-faults-bus-errors-on-a-computer-cluster/113019/2 "2024-04-16T15:06:57Z")

</div>

I assume you mean that `run.jl:40` is the `isfile` line?

What happens before this line? Are you using JLD2 at that point or is this part of a loop?

I suspect this is delayed IO error from lib. One thing that particularly stands out to me is the use of `mmapio`. It is particularly reminiscent of bus errors caused when using shared arrays.

> <https://github.com/JuliaLang/julia/issues/26222#issuecomment-368791269>
>
> Bus error occurs when I create big SharedArray and access to it.
> \`\`\`
> … \_
> \_ \_ \_(\_)\_ | A fresh approach to technical computing
> (\_) | (\_) (\_) | Documentation: https://docs.julialang.org
> \_ \_ \_| |\_ \_\_ \_ | Type "?help" for help.
> | | | | | | |/ \_\` | |
> | | |\_| | | | (\_| | | Version 0.6.2 (2017-12-13 18:08 UTC)
> \_/ |\\\_\_'\_|\_|\_|\\\_\_'\_| | Official http://julialang.org/ release
> |\_\_/ | x86\_64-pc-linux-gnu
> 
> shell\> free -h
> total used free shared buff/cache available
> Mem: 9.8G 2.0G 5.7G 80M 2.1G 7.4G
> Swap: 9G 0B 9G
> 
> julia\> s = SharedArray{UInt8}(5\*1024\*1024\*1024);
> 
> julia\> for i=1:1024:length(s)
> s\[i\] = 1
> end
> 
> signal (7): Bus error
> while loading no file, in expression starting on line 0
> setindex! at ./sharedarray.jl:483
> unknown function (ip: 0x7fedf3dbb013)
> jl\_call\_fptr\_internal at /buildworker/worker/package\_linux64/build/src/julia\_internal.h:339 \[inlined\]
> jl\_call\_method\_internal at /buildworker/worker/package\_linux64/build/src/julia\_internal.h:358 \[inlined\]
> jl\_apply\_generic at /buildworker/worker/package\_linux64/build/src/gf.c:1926
> macro expansion at ./REPL\[3\]:2 \[inlined\]
> anonymous at ./\<missing\> (unknown line)
> jl\_call\_fptr\_internal at /buildworker/worker/package\_linux64/build/src/julia\_internal.h:339 \[inlined\]
> jl\_call\_method\_internal at /buildworker/worker/package\_linux64/build/src/julia\_internal.h:358 \[inlined\]
> jl\_toplevel\_eval\_flex at /buildworker/worker/package\_linux64/build/src/toplevel.c:589
> jl\_toplevel\_eval\_in at /buildworker/worker/package\_linux64/build/src/builtins.c:496
> eval at ./boot.jl:235
> unknown function (ip: 0x7fee084e3d2f)
> jl\_call\_fptr\_internal at /buildworker/worker/package\_linux64/build/src/julia\_internal.h:339 \[inlined\]
> jl\_call\_method\_internal at /buildworker/worker/package\_linux64/build/src/julia\_internal.h:358 \[inlined\]
> jl\_apply\_generic at /buildworker/worker/package\_linux64/build/src/gf.c:1926
> eval\_user\_input at ./REPL.jl:66
> unknown function (ip: 0x7fee0856518f)
> jl\_call\_fptr\_internal at /buildworker/worker/package\_linux64/build/src/julia\_internal.h:339 \[inlined\]
> jl\_call\_method\_internal at /buildworker/worker/package\_linux64/build/src/julia\_internal.h:358 \[inlined\]
> jl\_apply\_generic at /buildworker/worker/package\_linux64/build/src/gf.c:1926
> macro expansion at ./REPL.jl:97 \[inlined\]
> \#1 at ./event.jl:73
> unknown function (ip: 0x7fedf3da12af)
> jl\_call\_fptr\_internal at /buildworker/worker/package\_linux64/build/src/julia\_internal.h:339 \[inlined\]
> jl\_call\_method\_internal at /buildworker/worker/package\_linux64/build/src/julia\_internal.h:358 \[inlined\]
> jl\_apply\_generic at /buildworker/worker/package\_linux64/build/src/gf.c:1926
> jl\_apply at /buildworker/worker/package\_linux64/build/src/julia.h:1424 \[inlined\]
> start\_task at /buildworker/worker/package\_linux64/build/src/task.c:267
> unknown function (ip: 0xffffffffffffffff)
> Allocations: 17167661 (Pool: 17166439; Big: 1222); GC: 15
> Bus error
> \`\`\`
> I found that some restrictions of OS could limit the size, but they are much bigger than I thought.
> \`\`\`
> shell\> ulimit -a
> core file size (blocks, -c) 0
> data seg size (kbytes, -d) unlimited
> scheduling priority (-e) 0
> file size (blocks, -f) unlimited
> pending signals (-i) 39900
> max locked memory (kbytes, -l) 64
> max memory size (kbytes, -m) unlimited
> open files (-n) 1024
> pipe size (512 bytes, -p) 8
> POSIX message queues (bytes, -q) 819200
> real-time priority (-r) 0
> stack size (kbytes, -s) 8192
> cpu time (seconds, -t) unlimited
> max user processes (-u) 39900
> virtual memory (kbytes, -v) unlimited
> file locks (-x) unlimited
> 
> shell\> ipcs -l
> 
> \------ Messages Limits --------
> max queues system wide = 32000
> max size of message (bytes) = 8192
> default max size of queue (bytes) = 16384
> 
> \------ Shared Memory Limits --------
> max number of segments = 4096
> max seg size (kbytes) = 18014398509465599
> max total shared memory (kbytes) = 18014398442373116
> min seg size (bytes) = 1
> 
> \------ Semaphore Limits --------
> max number of arrays = 32000
> max semaphores per array = 32000
> max semaphores system wide = 1024000000
> max ops per semop call = 500
> semaphore max value = 32767
> 
> 
> julia\> 
> \`\`\`

Do you have multiple jobs running on the same node that may be trying to use the same /dev/shm ? How large is /dev/shm?

---

<div class="post-metadata">

**Author:** ![andrewkhardy](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/andrewkhardy/32/27311_2.png) [@andrewkhardy](https://discourse.julialang.org/u/andrewkhardy)\
**Post date:** [April 17, 2024, 2:13am UTC](https://discourse.julialang.org/t/isfile-for-jld2-appears-to-be-giving-segmentation-faults-bus-errors-on-a-computer-cluster/113019/3 "2024-04-17T02:13:02Z")

</div>

These are all jobs running on different nodes, but it seems to be an error when two jobs try to touch the same piece of memory or something. I am not using any shared arrays or anything complicated. The only overlap is they’re all looking in the same directory. The lines prior are just defining strings, so it doesn’t seem to be the problem.

```julia
output_loc = params["output"]
input = split(input_file[begin:end-4], "/")[end]
file = output_loc * string(input) * "_final.jld2"

```

---

<div class="post-metadata">

**Author:** ![mkitti](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mkitti/32/12459_2.png) [@mkitti](https://discourse.julialang.org/u/mkitti)\
**Post date:** [April 17, 2024, 2:27am UTC](https://discourse.julialang.org/t/isfile-for-jld2-appears-to-be-giving-segmentation-faults-bus-errors-on-a-computer-cluster/113019/4 "2024-04-17T02:27:54Z")

</div>

JLD2 is using a memory mapping mechanism which may use overlapping resources with /dev/shm. My theory here is that some of jobs are running out of /dev/shm, possibly because there is more than one of them running on the same computer at once.

Did you tell the HPC cluster not to schedule jobs on the same node? My cluster will assign multiple jobs per node if they fit within the memory and cou constraints.

I’m really confused on how you would be receiving errors from lines of code that you did not run. Could you include the full unabridged error?

---

<div class="post-metadata">

**Author:** ![andrewkhardy](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/andrewkhardy/32/27311_2.png) [@andrewkhardy](https://discourse.julialang.org/u/andrewkhardy)\
**Post date:** [April 17, 2024, 4:14pm UTC](https://discourse.julialang.org/t/isfile-for-jld2-appears-to-be-giving-segmentation-faults-bus-errors-on-a-computer-cluster/113019/5 "2024-04-17T16:14:43Z")

</div>

```julia
[143001] signal (7.2): Bus error
in expression starting at /gpfs/fs1/home/a/aparamek/andykh/t_J.jl/VUMPS/run.jl:40
unsafe_store! at ./pointer.jl:146 [inlined]
unsafe_store! at ./pointer.jl:146 [inlined]
jlunsafe_store! at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/JLD2.jl:51 [inlined]
jlunsafe_store! at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/misc.jl:15 [inlined]
store_vlen! at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/data/writing_datatypes.jl:329 [inlined]
h5convert! at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/data/writing_datatypes.jl:418
unknown function (ip: 0x2b4d62f2e9d5)
write_data at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/dataio.jl:96
write_dataset at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/datasets.jl:581
jfptr_write_dataset_12158 at /scratch/a/aparamek/andykh/julia-depot-x86_64/compiled/v1.10/JLD2/O1EyT_F9htY.so (unknown line)
write_dataset at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/datasets.jl:581
jfptr_write_dataset_12158 at /scratch/a/aparamek/andykh/julia-depot-x86_64/compiled/v1.10/JLD2/O1EyT_F9htY.so (unknown line)
write_dataset at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/datasets.jl:653
write_ref at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/datasets.jl:656 [inlined]
WriteDataspace at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/dataspaces.jl:53
unknown function (ip: 0x2b4d62f2fa41)
write_dataset at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/inlineunion.jl:49
write_dataset at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/inlineunion.jl:36 [inlined]
write_ref at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/datasets.jl:656 [inlined]
h5convert! at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/data/writing_datatypes.jl:298 [inlined]
macro expansion at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/data/writing_datatypes.jl:237 [inlined]
h5convert! at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/data/writing_datatypes.jl:237 [inlined]
h5convert! at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/data/custom_serialization.jl:30 [inlined]
write_data at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/dataio.jl:96
write_dataset at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/datasets.jl:653
#write#110 at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/compression.jl:137
write at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/compression.jl:125 [inlined]
#write#109 at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/compression.jl:121 [inlined]
write at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/compression.jl:121
#89 at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/fileio.jl:14
unknown function (ip: 0x2b4d62f25c55)
#jldopen#69 at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/loadsave.jl:4
jldopen at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/loadsave.jl:1 [inlined]
#fileio_save#88 at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/fileio.jl:6 [inlined]
fileio_save at /scratch/a/aparamek/andykh/julia-depot-x86_64/packages/JLD2/VWinU/src/fileio.jl:5
unknown function (ip: 0x2b4d62f226b9)
jl_apply at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/julia.h:1982 [inlined]
jl_f__call_latest at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/builtins.c:812
#invokelatest#2 at ./essentials.jl:887 [inlined]
invokelatest at ./essentials.jl:884 [inlined]
#action#33 at /home/a/aparamek/andykh/.julia/packages/FileIO/jMf68/src/loadsave.jl:219
action at /home/a/aparamek/andykh/.julia/packages/FileIO/jMf68/src/loadsave.jl:196 [inlined]
#action#32 at /home/a/aparamek/andykh/.julia/packages/FileIO/jMf68/src/loadsave.jl:185 [inlined]
action at /home/a/aparamek/andykh/.julia/packages/FileIO/jMf68/src/loadsave.jl:185 [inlined]
#save#20 at /home/a/aparamek/andykh/.julia/packages/FileIO/jMf68/src/loadsave.jl:129
save at /home/a/aparamek/andykh/.julia/packages/FileIO/jMf68/src/loadsave.jl:125
unknown function (ip: 0x2b4d62f04d79)
#run_vumps#1 at /gpfs/fs1/home/a/aparamek/andykh/t_J.jl/VUMPS/vumps.jl:64
run_vumps at /gpfs/fs1/home/a/aparamek/andykh/t_J.jl/VUMPS/vumps.jl:21
unknown function (ip: 0x2b4d62ebc979)
jl_apply at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/julia.h:1982 [inlined]
do_call at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/interpreter.c:126
eval_value at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/interpreter.c:223
eval_stmt_value at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/interpreter.c:174 [inlined]
eval_body at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/interpreter.c:621
jl_interpret_toplevel_thunk at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/interpreter.c:775
jl_toplevel_eval_flex at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/toplevel.c:934
jl_toplevel_eval_flex at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/toplevel.c:877
ijl_toplevel_eval_in at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/toplevel.c:985
eval at ./boot.jl:385 [inlined]
include_string at ./loading.jl:2070
_include at ./loading.jl:2130
include at ./Base.jl:495
jfptr_include_46289 at /cvmfs/soft.computecanada.ca/easybuild/software/2023/x86-64-v4/Compiler/gcccore/julia/1.10.0/lib/julia/sys.so (unknown line)
exec_options at ./client.jl:318
_start at ./client.jl:552
jfptr__start_82647 at /cvmfs/soft.computecanada.ca/easybuild/software/2023/x86-64-v4/Compiler/gcccore/julia/1.10.0/lib/julia/sys.so (unknown line)
jl_apply at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/julia.h:1982 [inlined]
#run_vumps#1 at /gpfs/fs1/home/a/aparamek/andykh/t_J.jl/VUMPS/vumps.jl:64
run_vumps at /gpfs/fs1/home/a/aparamek/andykh/t_J.jl/VUMPS/vumps.jl:21
unknown function (ip: 0x2b4d62ebc979)
jl_apply at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/julia.h:1982 [inlined]
do_call at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/interpreter.c:126
eval_value at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/interpreter.c:223
eval_stmt_value at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/interpreter.c:174 [inlined]
eval_body at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/interpreter.c:621
jl_interpret_toplevel_thunk at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/interpreter.c:775
jl_toplevel_eval_flex at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/toplevel.c:934
jl_toplevel_eval_flex at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/toplevel.c:877
ijl_toplevel_eval_in at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/toplevel.c:985
eval at ./boot.jl:385 [inlined]
include_string at ./loading.jl:2070
_include at ./loading.jl:2130
include at ./Base.jl:495
jfptr_include_46289 at /cvmfs/soft.computecanada.ca/easybuild/software/2023/x86-64-v4/Compiler/gcccore/julia/1.10.0/lib/julia/sys.so (unknown line)
exec_options at ./client.jl:318
_start at ./client.jl:552
jfptr__start_82647 at /cvmfs/soft.computecanada.ca/easybuild/software/2023/x86-64-v4/Compiler/gcccore/julia/1.10.0/lib/julia/sys.so (unknown line)
jl_apply at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/julia.h:1982 [inlined]
true_main at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/jlapi.c:582
jl_repl_entrypoint at /tmp/ebuser/avx512/Julia/1.10.0/GCCcore-12.3-gentoo/julia-1.10.0/src/jlapi.c:731
main at julia (unknown line)
unknown function (ip: 0x2b4d4d932949)
__libc_start_main at /cvmfs/soft.computecanada.ca/gentoo/2023/x86-64-v3/usr/lib64/libc.so.6 (unknown line)
_start at julia (unknown line)

```

---

<div class="post-metadata">

**Author:** ![andrewkhardy](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/andrewkhardy/32/27311_2.png) [@andrewkhardy](https://discourse.julialang.org/u/andrewkhardy)\
**Post date:** [April 17, 2024, 4:15pm UTC](https://discourse.julialang.org/t/isfile-for-jld2-appears-to-be-giving-segmentation-faults-bus-errors-on-a-computer-cluster/113019/6 "2024-04-17T16:15:27Z")

</div>

This cluster explicitly only runs jobs on entire nodes.