IM 线上机器分析

基本参数

-server 
-Xms6120m 
-Xmx6120m 
-Xmn2g 
-XX:SurvivorRatio=6 
-XX:PermSize=256M 
-XX:MaxPermSize=256m 
-Xss256k 
-Dsun.jnu.encoding=UTF-8 
-Dfile.encoding=UTF-8 
-Xloggc:/logs/gc.log 
-XX:+PrintGCDetails 
-XX:+PrintGCDateStamps 
-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp/heapdump_20170318_001436.hprof 
-Dcom.sun.management.jmxremote.port=1161 
-Dcom.sun.management.jmxremote.ssl=false 
-Dcom.sun.management.jmxremote.authenticate=false 
-XX:GCTimeRatio=19 
-XX:+DisableExplicitGC 
-Xnoclassgc 
-XX:MaxTenuringThreshold=7 
-XX:ParallelGCThreads=5 
-XX:+UseParNewGC 
-XX:MaxGCPauseMillis=100 
-XX:+UseConcMarkSweepGC 
-XX:CMSFullGCsBeforeCompaction=5

java version "1.6.0_27-ea"
Java(TM) SE Runtime Environment (build 1.6.0_27-ea-b03)
Java HotSpot(TM) 64-Bit Server VM (build 20.2-b03, mixed mode)

java version "1.7.0_75"
Java(TM) SE Runtime Environment (build 1.7.0_75-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.75-b04, mixed mode)

54

2234 ~ 2925 人在线

im_dstat_54.png

jstat 参考

> jstat -gcutil `pgrep java` 3000 20
 S0     S1     E      O      P     YGC     YGCT    FGC    FGCT     GCT
 20.40   0.00  72.88  45.50  13.60   1292   89.409     4    0.558   89.967
 20.40   0.00  86.48  45.50  13.60   1292   89.409     4    0.558   89.967
  0.00  20.68   5.25  45.59  13.60   1293   89.482     4    0.558   90.040
  0.00  20.68  20.72  45.59  13.60   1293   89.482     4    0.558   90.040
  0.00  20.68  39.30  45.59  13.60   1293   89.482     4    0.558   90.040
  0.00  20.68  57.87  45.59  13.60   1293   89.482     4    0.558   90.040
  0.00  20.68  76.50  45.59  13.60   1293   89.482     4    0.558   90.040
  0.00  20.68  94.39  45.59  13.60   1293   89.482     4    0.558   90.040
 21.11   0.00  13.77  45.69  13.60   1294   89.571     4    0.558   90.128
 21.11   0.00  34.67  45.69  13.60   1294   89.571     4    0.558   90.128
 21.11   0.00  53.67  45.69  13.60   1294   89.571     4    0.558   90.128
 21.11   0.00  74.58  45.69  13.60   1294   89.571     4    0.558   90.128
 21.11   0.00  93.11  45.69  13.60   1294   89.571     4    0.558   90.128
  0.00  21.07  11.22  45.76  13.60   1295   89.623     4    0.558   90.180
  0.00  21.07  30.31  45.76  13.60   1295   89.623     4    0.558   90.180
  0.00  21.07  49.62  45.76  13.60   1295   89.623     4    0.558   90.180
  0.00  21.07  66.87  45.76  13.60   1295   89.623     4    0.558   90.180
  0.00  21.07  85.07  45.76  13.60   1295   89.623     4    0.558   90.180
 21.04   0.00   3.02  45.84  13.60   1296   89.704     4    0.558   90.262
 21.04   0.00  19.99  45.84  13.60   1296   89.704     4    0.558   90.262

68

2267 人在线

im_dstat_68.png

jstat 参考

> jstat -gcutil `pgrep java` 3000 20
  S0     S1     E      O      P     YGC     YGCT    FGC    FGCT     GCT
 15.69   0.00  48.98  57.08  11.62   1456  112.987     4    0.465  113.452
 15.69   0.00  71.34  57.08  11.62   1456  112.987     4    0.465  113.452
 15.69   0.00  93.72  57.08  11.62   1456  112.987     4    0.465  113.452
  0.00  17.58  17.98  57.15  11.62   1457  113.056     4    0.465  113.522
  0.00  17.58  38.76  57.15  11.62   1457  113.056     4    0.465  113.522
  0.00  17.58  62.44  57.15  11.62   1457  113.056     4    0.465  113.522
  0.00  17.58  85.18  57.15  11.62   1457  113.056     4    0.465  113.522
 15.36   0.00   5.48  57.23  11.62   1458  113.134     4    0.465  113.599
 15.36   0.00  23.99  57.23  11.62   1458  113.134     4    0.465  113.599
 15.36   0.00  41.16  57.23  11.62   1458  113.134     4    0.465  113.599
 15.36   0.00  59.77  57.23  11.62   1458  113.134     4    0.465  113.599
 15.36   0.00  77.74  57.23  11.62   1458  113.134     4    0.465  113.599
 15.36   0.00  97.79  57.23  11.62   1458  113.134     4    0.465  113.599
  0.00  15.30  16.13  57.29  11.62   1459  113.210     4    0.465  113.675
  0.00  15.30  34.41  57.29  11.62   1459  113.210     4    0.465  113.675
  0.00  15.30  52.48  57.29  11.62   1459  113.210     4    0.465  113.675
  0.00  15.30  71.87  57.29  11.62   1459  113.210     4    0.465  113.675
  0.00  15.30  92.82  57.29  11.62   1459  113.210     4    0.465  113.675
 15.44   0.00  14.61  57.37  11.62   1460  113.282     4    0.465  113.748
 15.44   0.00  32.86  57.37  11.62   1460  113.282     4    0.465  113.748

73

2211 ~ 2831 人在线

im_dstat_73.png

jstat 参考

[root@vm_50_73 sunchanghao]# jstat -gcutil `pgrep java` 3000 20
  S0     S1     E      O      P     YGC     YGCT    FGC    FGCT     GCT
 17.67   0.00  53.93  83.99  13.50   1386   86.623    14    1.366   87.989
 17.67   0.00  72.27  83.99  13.50   1386   86.623    14    1.366   87.989
 17.67   0.00  93.25  83.99  13.50   1386   86.623    14    1.366   87.989
  0.00  15.82  13.25  84.11  13.50   1387   86.695    14    1.366   88.061
  0.00  15.82  32.82  84.11  13.50   1387   86.695    14    1.366   88.061
  0.00  15.82  50.25  84.11  13.50   1387   86.695    14    1.366   88.061
  0.00  15.82  68.35  84.11  13.50   1387   86.695    14    1.366   88.061
  0.00  15.82  86.04  84.11  13.50   1387   86.695    14    1.366   88.061
 17.83   0.00   4.08  84.26  13.50   1388   86.756    14    1.366   88.122
 17.83   0.00  28.89  84.26  13.50   1388   86.756    14    1.366   88.122
 17.83   0.00  49.66  84.26  13.50   1388   86.756    14    1.366   88.122
 17.83   0.00  70.72  84.26  13.50   1388   86.756    14    1.366   88.122
 17.83   0.00  89.46  84.26  13.50   1388   86.756    14    1.366   88.122
  0.00  15.50   6.33  84.42  13.50   1389   86.819    14    1.366   88.185
  0.00  15.50  26.75  84.42  13.50   1389   86.819    14    1.366   88.185
  0.00  15.50  46.33  84.42  13.50   1389   86.819    14    1.366   88.185
  0.00  15.50  64.08  84.42  13.50   1389   86.819    14    1.366   88.185
  0.00  15.50  81.98  84.42  13.50   1389   86.819    14    1.366   88.185
 17.45   0.00   0.00  84.57  13.50   1390   86.883    14    1.366   88.249
 17.45   0.00  22.53  84.57  13.50   1390   86.883    14    1.366   88.249

初步分析

• CPU 20~30% 左右
• 网络吞吐接近 2~3M
• 磁盘基本无读取纯写入（log）
• 内存使用率超过70%