Let $S$ be an integral Dedekind scheme.

Let $f:X\longrightarrow \mathbf{P}^1_{S}$ be a finite flat surjective morphism, where $X$ is an integral normal scheme. 

Let $\eta$ be the generic point of $S$. Note that $f_\eta:X_\eta\longrightarrow \mathbf{P}^1_{K(S)}$ is a finite morphism of curves over $K(S)$.

Question. Is $f$ the normalization of $\mathbf{P}^1_S$ in the function field of $X_\eta$?


Question: Shared memory: shmget fails: No space left on device -- how to increase limits?
Answer: As shmget() allocates a new shared memory segment, and you seem to use a lot of them (considering your limits.conf), isn't possible you are using too many shared memory segments? I do not have a lot of experience with calling shmget(), but it seems to me the number of possible open files (1000000) is larger than the amount of allowed shared memory segments (SHMMNI), which is 409600.