mat 用于分析 jvm 堆内存，mac 安装后，启动报错：
Failed to create the Java Virtual Machine
解决：在配置文件中指定 jdk
完整配置文件如下：
$ cat /Applications/mat.app/Contents/Eclipse/MemoryAnalyzer.ini
-startup
../Eclipse/plugins/org.eclipse.equinox.launcher_1.5.700.v20200207-2156.jar
--launcher.library
../Eclipse/plugins/org.eclipse.equinox.launcher.cocoa.macosx.x86_64_1.1.1100.v20190907-0426
-vm
/Library/Java/JavaVirtualMachines/jdk1.8.0_271.jdk/Contents/Home/bin
-vmargs
-Xmx1024m
-Dorg.eclipse.swt.internal.carbon.smallFonts
-XstartOnFirstThread
Ini
再次启动，终于正常
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