安裝編譯器
sudo yum -y install gcc make
sudo yum -y install gcc gcc-c++
安裝libunwind與google-perfile
#安裝libunwind
wget http://download.savannah.gnu.org/releases/libunwind/libunwind-0.99-beta.tar.gz
tar -zxvf libunwind-0.99-beta.tar.gz
cd libunwind-0.99
./configure --prefix=/data/google-perftools/libunwind #自定義安裝目錄
make && make install
#安裝google-perfile
wget https://github.com/gperftools/gperftools/releases/download/gperftools-2.5/gperftools-2.5.tar.gz
tar -zxvf gperftools-2.5.tar.gz
cd gperftools-2.5
./configure --prefix=/data/google-perftools/gperftools-2.5 #自定義安裝目錄
make && make install
使配置生效
vim /etc/ld.so.conf.d/usr_local_lib.conf
/data/google-perftools/libunwind/lib #${libunwind自定義目錄}/bin
:wq! #保存退出
/sbin/ldconfig #執行此命令，使libunwind生效，需要sudo權限
在要監視的應用啓動前添加系統變量
export LD_PRELOAD=/data/server/google-perftools/gperftools-2.5/lib/libtcmalloc.so
export HEAPPROFILE=/data/server/google-perftools/heap/hprof #分析文件存放位置
注意：不要加入系統變量文件中，如果加入就會導致所有使用內存的程序都會分析，導致後續操作無法進行。
執行要分析的程序
[root@master ~]# java -jar spring-boot-base-2.x-1.0-SNAPSHOT.jar --server.port=9090
Starting tracking the heap
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.3.RELEASE)
4312 [main] INFO c.z.s.b.b.SpringBootBaseApplication - Starting SpringBootBaseApplication on master with PID 54825 (/root/spring-boot-base-2.x-1.0-SNAPSHOT.jar started by root in /root)
4338 [main] INFO c.z.s.b.b.SpringBootBaseApplication - The following profiles are active: dev
13786 [main] INFO o.s.b.w.e.tomcat.TomcatWebServer - Tomcat initialized with port(s): 9090 (http)
13892 [main] INFO o.a.coyote.http11.Http11NioProtocol - Initializing ProtocolHandler ["http-nio-9090"]
13937 [main] INFO o.a.catalina.core.StandardService - Starting service [Tomcat]
13938 [main] INFO o.a.catalina.core.StandardEngine - Starting Servlet engine: [Apache Tomcat/9.0.16]
13994 [main] INFO o.a.c.core.AprLifecycleListener - The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib]
14350 [main] INFO o.a.c.c.C.[Tomcat].[localhost].[/] - Initializing Spring embedded WebApplicationContext
14351 [main] INFO o.s.web.context.ContextLoader - Root WebApplicationContext: initialization completed in 9554 ms
Dumping heap profile to /data/google-perftools/heap/hprof.0001.heap (1024 MB allocated cumulatively, 76 MB currently in use)
17685 [main] INFO o.s.s.c.ThreadPoolTaskExecutor - Initializing ExecutorService 'applicationTaskExecutor'
注意：啓動日誌中出現
Starting tracking the heap、Dumping heap profile to /data/google-perftools/heap/hprof.0001.heap (1024 MB allocated cumulatively, 76 MB currently in use)等字樣代表監測成功
分析結果
% /data/google-perftools/gperftools-2.5/bin/pprof -text /data/server/java/bin/java /data/google-perftools/heap/*.heap
Total: 130.5 MB
122.3 93.8% 93.8% 122.3 93.8% os::malloc@9019e0
6.2 4.8% 98.5% 6.2 4.8% inflateInit2_@b6d0
1.0 0.7% 99.3% 1.0 0.7% readCEN
0.4 0.3% 99.6% 0.4 0.3% init
0.2 0.2% 99.7% 0.2 0.2% updatewindow
0.1 0.1% 99.8% 0.1 0.1% _GLOBAL__sub_I_eh_alloc.cc
0.1 0.1% 99.9% 6.3 4.8% Java_java_util_zip_Inflater_init
0.0 0.0% 99.9% 0.0 0.0% _dl_new_object
0.0 0.0% 100.0% 0.0 0.0% __GI__dl_allocate_tls
0.0 0.0% 100.0% 0.0 0.0% os::malloc@901840
0.0 0.0% 100.0% 0.0 0.0% _dl_check_map_versions
0.0 0.0% 100.0% 0.0 0.0% read_alias_file
0.0 0.0% 100.0% 0.0 0.0% _nl_intern_locale_data
...
- The first column contains the direct memory use in MB.
- 第一列顯示內存使用情況，英文說直接內存，暫不確定是否爲堆外直接內存
- The fourth column contains memory use by the procedure and all of its callees.
- 第四列包含所有調用的內存使用情況
- The second and fifth columns are just percentage representations of the numbers in the first and fourth columns.
- 第二列和第五列是第一列和第四列的百分比值
- The third column is a cumulative sum of the second column (i.e., the
kth entry in the third column is the sum of the firstkentries in the second column.)- 第三列是第二列的累加