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...d by about a factor of 2, but the slowdown appeared to be localized to specific routines, which would go from taking ~1s to ~50-100s. I first assumed it had to do with communication, but as I made the timing information more fine grained, it became clear that nearly trivial loops like DO I=1,GRIDC%RL%NP DWORK1(I,ISP)= REAL( DWORK(I,ISP) ,KIND=q) ENDDO were a large part of the problem. The only thing I could find after poking around that was at all odd is that when this happened, khugepaged would be taking 100% of cpu for tens of seconds on the affected nodes. It appears, alth...