\item In Page 2, Section 2, we have added a paragraph describing the contributions of our work.
\item In Section 4, we have reduced the theory part of the GMRES method as suggested by Reviewer 2.
\item In Section 5.2, we have clarified that the same optimizations are used on the CPU version of the parallel GMRES algorithm too.
\item In Page 2, Section 2, we have added a paragraph describing the contributions of our work.
\item In Section 4, we have reduced the theory part of the GMRES method as suggested by Reviewer 2.
\item In Section 5.2, we have clarified that the same optimizations are used on the CPU version of the parallel GMRES algorithm too.