单项选择题
While a user is compiling a C program, "vmstat 120 10" is run to determine the cause of a performance problem. Using the vmstat output as shown in the exhibit, which of the following conclusions is most appropriate to draw?（）
A. There is a file I/O bottleneck. B. There are too many open files. C. There appears to be a buffer shortage. D. There is a paging space I/O bottleneck.
单项选择题 Whenplanningtoaccesstheon-linedocumentationfromaremoteclient,whichofthefollowingproceduresshouldbeperformedontheserver?（）
单项选择题 Whichofthefollowingproceduresshouldbeperformedtominimizepossibleproblemsforacustomerwhenupdatingsoftware?（）
单项选择题 Whereisthershloglocated?（）
