Dear all: I run my hadoop program with another MPI program on the same cluster. here is the result of "top". PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 11750 qianglv 25 0 233m 99m 6100 R 99.7 2.5 116:05.59 rosetta.mpich 18094 cip 17 0 3136m 68m 15m S 0.5 1.7 0:12.69 java 18244 cip 17 0 3142m 80m 15m S 0.2 2.0 0:17.61 java 18367 cip 18 0 2169m 88m 15m S 0.1 2.3 0:17.46 java 18012 cip 18 0 3141m 77m 15m S 0.1 2.0 0:14.49 java 18584 cip 21 0 1111m 46m 15m S 0.1 1.2 0:05.12 java
My Hadoop program can only get no more than 1 percent cpu time slide in total, compared with the rosetta.mpich program's 99.7%. I'm sure my program is in progress since the log files told me, they are running normally. Someone told me, it's the nature of Java program, low cpu priority, especially compared with C program. Is that true? Regards Song Liu in Suzhou University.
