单项选择题
A. ps
B. tprof
C. iostat
D. vmstat
单项选择题 Themaxmbuffislowbydefaultforsystemsexpectinghighnetworktrafficand/orusage.Whichofthefollowingutilitiesshouldbeusedtoreportrequestsformbufsthathavefailedand/orbeendenied？（）
单项选择题 WhichofthefollowingcommandsshouldbeusedtodeterminewhichdiskofasystemisexperiencingadiskI/Operformanceproblem？（）
单项选择题 Whichofthefollowingcommandscanbeusedtocleanupafailedsoftwareinstallationprocess？（）