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I was running a simulation of a PEXed circuit block.
The size of psf folder was exceeding 297GB !! Why So large size ?
The PSS really took almost 2 days with APS enabled and at 39%, it gave following error:-
Could anybody please tell what is the cause of this error and how to avoid this error and coplete the PSS of big circuits.
\o pss: time = 235.9 ns (39.3 %), step = 1.025 ps (171 u%)\o \o \o \o Error found by spectre at time = 235.888 ns during periodic steady state\o analysis `pss'.\o ERROR (SPECTRE-7031): SST2 Error: No space left on device.\o \o ERROR (SPECTRE-7031): SST2 Error: No space left on device.\o \o \o \o Analysis `pss' was terminated prematurely due to an error.
The circuit simulation info is as below:-
Circuit inventory:\o nodes 449447\o \o bsim3v3 17914 \o \o capacitor 1397804\o diode 48 \o \o inductor 1 \o port 5 \o res_va 12 \o \o resistor 528771\o \o transformer 22 \o \o vcvs 9 \o \o vsource 19 \o \o \o \o Notice from spectre during initial setup.\o APS Enabled.\o \o Multithreading Enabled: 8 threads on system with 8 available processors.\o \o \o 3 notices suppressed.\o \o 1993 warnings suppressed.\o \o \o \o \o Time for parsing: CPU = 389.862 s (6m 29.9s), elapsed = 392.837 s (6m \o 32.8s).\o \o Time accumulated: CPU = 453.545 s (7m 33.5s), elapsed = 456.924 s (7m \o 36.9s).\o \o Peak resident memory used = 3.19 Gbytes.\o \o \o \o \o ******************\o DC Analysis `dcOp'\o ******************\o \o Finding DC approximate solution failed. Try again with try_fast_op set to no.\o \o Important parameter values:\o reltol = 1e-03\o \o abstol(V) = 100 uV\o abstol(I) = 100 pA\o \o temp = 27 C\o \o tnom = 27 C\o \o tempeffects = all\o \o gmindc = 1 pS\o rabsshort = 1 mOhm\o \o Trying `homotopy = gmin'.\o \o \o Notice from spectre during DC analysis `dcOp'.\o Bad pivoting is found during DC analysis. Option dc_pivot_check=yes is\o \o recommended for possible improvement of convergence.\o \o \o Convergence achieved in 80 iterations.\o \o Total time required for dc analysis `dcOp': CPU = 1.08634 ks (18m 6.3s),\o elapsed = 687.388 s (11m 27.4s).\o \o Time accumulated: CPU = 1.54125 ks (25m 41.2s), elapsed = 1.14572 ks (19m \o 5.7s).\o \o Peak resident memory used = 4.49 Gbytes.\o \o \o \o dcOpInfo: writing operating point information to rawfile.\o \o \o ***************************************************\o Periodic Steady-State Analysis `pss': fund = 20 MHz\o ***************************************************\o \o \o \o Notice from spectre during IC analysis, during periodic steady state analysis\o `pss'.\o Bad pivoting is found during DC analysis. Option dc_pivot_check=yes is\o recommended for possible improvement of convergence.\o \o \o \o =============================\o `pss': time = (0 s -> 600 ns)\o =============================\o \o Important parameter values in tstab integration:\o \o start = 0 s\o outputstart = 0 s\o stop = 600 ns\o period = 50 ns\o step = 650 ps\o \o maxstep = 2 ns\o \o ic = all\o \o useprevic = no\o \o skipdc = no\o \o reltol = 1e-03\o \o abstol(V) = 100 uV\o \o abstol(I) = 100 pA\o temp = 27 C\o \o tnom = 27 C\o \o tempeffects = all\o \o method = gear2only\o \o lteratio = 3.5\o \o relref = sigglobal\o \o cmin = 0 F\o \o gmin = 1 pS\o \o rabsshort = 1 mOhm
Presumably the disk filled up or you exceeded your quota because you saved too many nodes - maybe you're saving all node voltages and with almost half a million nodes that's going to be a lot of data.
Be more selective about what signals you save from the simulator.