Java 性能优化笔记
1、cat /proc/meminfo
2、vmstat
3、top
4、mpstat
5、netstat -i
6、iostat
20:16 [[email protected]]$ cat /proc/meminfo MemTotal: 32915692 kB MemFree: 3503512 kB Buffers: 710656 kB Cached: 23038124 kB SwapCached: 0 kB Active: 15198332 kB Inactive: 13184936 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 32915692 kB LowFree: 3503512 kB SwapTotal: 4194460 kB SwapFree: 4194160 kB Dirty: 768 kB Writeback: 0 kB AnonPages: 4633532 kB Mapped: 23772 kB Slab: 968768 kB PageTables: 15004 kB NFS_Unstable: 0 kB Bounce: 0 kB CommitLimit: 20652304 kB Committed_AS: 11278388 kB VmallocTotal: 34359738367 kB VmallocUsed: 265952 kB VmallocChunk: 34359471923 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 Hugepagesize: 2048 kB
2、vmstat
20:16 [[email protected]]$ vmstat procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 1 0 300 3508340 710652 23032412 0 0 0 2 0 0 0 0 100 0 0
3、top
tty:[3] jobs:[0] cwd:[~] 20:18 [[email protected]]$ top top - 20:20:56 up 392 days, 2:26, 5 users, load average: 0.58, 0.87, 0.84 Tasks: 311 total, 1 running, 310 sleeping, 0 stopped, 0 zombie Cpu(s): 2.3%us, 0.2%sy, 0.0%ni, 97.3%id, 0.1%wa, 0.0%hi, 0.1%si, 0.0%st Mem: 32915692k total, 29417280k used, 3498412k free, 710664k buffers Swap: 4194460k total, 300k used, 4194160k free, 23043968k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 20123 cafe 18 0 5315m 3.3g 10m S 59.5 10.4 4790:57 java 12947 nginx 15 0 268m 27m 936 S 2.3 0.1 106:34.36 nginx 2 root RT -5 0 0 0 S 0.3 0.0 15:02.25 migration/0 13221 mongod 15 0 503m 16m 4884 S 0.3 0.1 45:13.38 mongod 1 root 15 0 10368 680 572 S 0.0 0.0 0:05.19 init 3 root 34 19 0 0 0 S 0.0 0.0 0:00.80 ksoftirqd/0 4 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0 5 root RT -5 0 0 0 S 0.0 0.0 0:17.88 migration/1 6 root 34 19 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/1 7 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/1
4、mpstat
10:56 [[email protected]]$ mpstat Linux 2.6.18-308.el5 (a01.crond.uc.zhaowei.youku) 2014年07月01日 10时59分26秒 CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s 10时59分26秒 all 1.44 0.00 0.03 0.07 0.00 0.01 0.00 98.44 368.89
5、netstat -i
20:22 [[email protected]]$ netstat -i Kernel Interface table Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg eth0 1500 0 30169625431 0 1190 0 14671156375 0 0 0 BMRU lo 16436 0 47968271 0 0 0 47968271 0 0 0 LRU tty:[2] jobs:[0] cwd:[~]
6、iostat
20:25 [[email protected]]$ iostat Linux 2.6.18-308.el5 (a01.crond.uc.zhaowei.youku) 2014年07月01日 avg-cpu: %user %nice %system %iowait %steal %idle 1.44 0.00 0.05 0.07 0.00 98.44 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 2.84 5.94 153.74 176752409 4570969202 sda1 0.00 0.00 0.00 2052 98 sda2 1.06 0.29 21.44 8484306 637521448 sda3 0.00 0.00 0.00 1430 600 sda4 0.00 0.00 0.00 8 0 sda5 1.77 5.66 132.30 168264077 3933447056 tty:[2] jobs:[0] cwd:[~]
iostat -xm 5
Linux 2.6.18-308.el5 (a01.crond.uc.zhaowei.youku) 2014年07月01日
avg-cpu: %user %nice %system %iowait %steal %idle
1.44 0.00 0.05 0.07 0.00 98.44
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.01 16.43 0.05 2.79 0.00 0.08 56.31 0.11 37.73 7.07 2.00
sda1 0.00 0.00 0.00 0.00 0.00 0.00 14.53 0.00 10.42 7.95 0.00
sda2 0.00 1.63 0.02 1.05 0.00 0.01 20.42 0.03 31.82 7.10 0.76
sda3 0.00 0.00 0.00 0.00 0.00 0.00 58.00 0.00 13.17 10.00 0.00
sda4 0.00 0.00 0.00 0.00 0.00 0.00 2.00 0.00 2.75 2.75 0.00
sda5 0.01 14.80 0.03 1.74 0.00 0.06 77.86 0.07 41.28 8.04 1.42