To print the GC statistic of a running tomcat process every 5 seconds:
/home/user$ pid=jps | grep Bootstrap | cut -d' ' -f1; jstat -gcutil $pid 5000
S0 S1 E O P YGC YGCT FGC FGCT GCT
25.96 0.00 89.72 25.30 94.37 18 10.044 0 0.000 10.044
29.64 0.00 12.71 28.39 94.09 20 10.241 0 0.000 10.241
0.00 27.27 74.97 30.29 94.46 21 10.339 0 0.000 10.339
0.00 47.80 67.70 34.32 94.81 23 10.554 0 0.000 10.554
0.00 58.01 31.34 39.08 94.95 25 10.797 0 0.000 10.797
27.86 0.00 43.51 42.36 95.13 26 10.927 0 0.000 10.927
0.00 31.09 72.16 43.90 95.26 27 11.017 0 0.000 11.017
36.36 0.00 73.28 45.63 95.39 28 11.109 0 0.000 11.109
/home/wenlong 