Hi there,

I am facing a problem calculating CCSD polarizability.

Sharing last few lines of the output.

```
Wfn Parameters:
--------------------
Wavefunction = CCSD
Number of irreps = 1
Number of MOs = 615
Number of active MOs = 615
AO-Basis = NONE
Semicanonical = false
Reference = RHF
Print Level = 1
IRREP # MOs # FZDC # DOCC # SOCC # VIRT # FZVR
----- ----- ------ ------ ------ ------ ------
A 615 0 24 0 591 0
Transforming integrals...
IWL integrals will be deleted.
(OO|OO)...
Presorting SO-basis two-electron integrals.
Sorting File: SO Ints (nn|nn) nbuckets = 3
Constructing frozen core operators
Starting first half-transformation.
Sorting half-transformed integrals.
First half integral transformation complete.
Starting second half-transformation.
Two-electron integral transformation complete.
(OO|OV)...
Starting second half-transformation.
Two-electron integral transformation complete.
(OO|VV)...
Starting second half-transformation.
Two-electron integral transformation complete.
(OV|OO)...
Starting first half-transformation.
Sorting half-transformed integrals.
First half integral transformation complete.
Starting second half-transformation.
Two-electron integral transformation complete.
(OV|OV)...
Starting second half-transformation.
Two-electron integral transformation complete.
(OV|VV)...
Starting second half-transformation.
Two-electron integral transformation complete.
(VV|OO)...
Starting first half-transformation.
Sorting half-transformed integrals.
First half integral transformation complete.
Starting second half-transformation.
Two-electron integral transformation complete.
(VV|OV)...
Starting second half-transformation.
Two-electron integral transformation complete.
(VV|VV)...
Starting second half-transformation.
Two-electron integral transformation complete.
Frozen core energy = 0.00000000000000
Size of irrep 0 of <ab|cd> integrals: 121997.217 (MW) / 975977.736 (MB)
Total: 121997.217 (MW) / 975977.736 (MB)
Size of irrep 0 of <ia|bc> integrals: 4954.202 (MW) / 39633.614 (MB)
Total: 4954.202 (MW) / 39633.614 (MB)
Size of irrep 0 of tijab amplitudes: 201.186 (MW) / 1609.487 (MB)
Total: 201.186 (MW) / 1609.487 (MB)
Traceback (most recent call last):
File "/home/hp/psi4conda/bin/psi4", line 333, in <module>
exec(content)
File "<string>", line 39, in <module>
File "/home/hp/psi4conda/lib//python3.8/site-packages/psi4/driver/driver.py", line 905, in properties
wfn = procedures['properties'][lowername](lowername, **kwargs)
File "/home/hp/psi4conda/lib//python3.8/site-packages/psi4/driver/procrouting/proc.py", line 3092, in run_cc_property
ccwfn = run_ccenergy(name, **kwargs)
File "/home/hp/psi4conda/lib//python3.8/site-packages/psi4/driver/procrouting/proc.py", line 2744, in run_ccenergy
core.cctransort(ref_wfn)
RuntimeError:
Fatal Error: PSIO_ERROR: 12 (error writing to file)
Error occurred in file: /scratch/psilocaluser/conda-builds/psi4-multiout_1628017372763/work/psi4/src/psi4/libpsio/error.cc on line: 133
The most recent 5 function calls were:
psi::PSIO::rw(unsigned long, char*, psi::psio_address, unsigned long, int)
psi::DPD::file4_mat_irrep_wrt(psi::dpdfile4*, int)
Printing out the relevant lines from the Psithon --> Python processed input file:
unit angstrom
Printing out the relevant lines from the Psithon --> Python processed input file:
unit angstrom
noreorient
""")
core.IO.set_default_namespace("")
core.set_global_option("BASIS", "def2-qzvppd")
--> properties('ccsd',properties=['polarizability'])
```

This is the sample input,

```
memory 96gb
molecule {
C -0.085645 -0.031660 0.042236
N -0.622926 -1.200974 -0.632187
C -0.592638 1.291559 -0.531072
O -1.071436 1.443008 -1.625520
O -0.427768 2.316158 0.340628
H -0.740932 3.121305 -0.098162
H -1.631665 -1.234889 -0.547775
H -0.396590 -0.065420 1.088303
H -0.422026 -1.154003 -1.625043
C 1.447420 -0.048364 -0.006558
H 1.870311 0.802066 0.525575
H 1.808178 -0.969475 0.447100
H 1.795925 -0.016801 -1.040551
unit angstrom
noreorient
}
set {
basis def2-qzvppd
}
properties('ccsd',properties=['polarizability'])
```

I think this is an issue of large scratch file, I may be wrong.

Apart from this issue, can anyone tell me the memory requirement of this type of job? I have 128GB of memory and 16 core. But the core utilization was very less (less than 4) throughout the job.

Thank You.