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问题：总觉得mac发热厉害，应该是跟cpu的使用有关，在Activity Monitor中看了一下，发现ReportCrash循环往复的出现，直接kill还会再出来，占用的cpu还比较高。我的系统是macos 10.13.1
查了一下，当有进程crash的时候，ReportCrash就会出现，由于进程处于这样一个循环：运行、崩溃、再运行，ReportCrash就会一致出现。
要怎么定位是哪个进程crash了呢？
办法是查看system.log，它的位置：/var/log/system.log，我看了一下我的（可以用console这个应用打开）：
May 27 17:08:24 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
May 27 17:08:24 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.dt.XCSBuilderService): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
May 27 17:08:34 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
May 27 17:08:34 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.dt.XCSBuilderService): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
May 27 17:08:44 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
May 27 17:08:44 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.dt.XCSBuilderService): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
May 27 17:08:54 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
May 27 17:08:54 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.dt.XCSBuilderService): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
May 27 17:09:04 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
May 27 17:09:04 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.dt.XCSBuilderService): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
May 27 17:09:14 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
May 27 17:09:14 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.dt.XCSBuilderService): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
May 27 17:09:25 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
May 27 17:09:25 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.dt.XCSBuilderService): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
May 27 17:09:35 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
May 27 17:09:35 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.dt.XCSBuilderService): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
May 27 17:09:45 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
May 27 17:09:45 itscs-MacBook-Pro com.apple.xpc.launchd[1] (com.apple.dt.XCSBuilderService): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.看样子有两个进程在不停的循环启动，IMRemoteURLConnectionAgent和XCSBuilderService，后面一个看起来像xcode的，在Activity Monitor中强制退出后，就没有reportcrash了。
参考：
ReportCrash High CPU & How to Disable reportcrash in Mac OSX