Kotlin 讓人既愛有恨之編譯速度優(yōu)化

寫kotlin很久了温峭，一直以來都不太滿意kotlin的編譯速度，特別是項目中大量使用kapt 。但是也能忍受却桶。但自從我的電腦讓我玩壞了之后碱呼。編譯速度一度讓我懷疑人生砍艾，總感覺星哥順走了我的內(nèi)存條∥【伲可惜我這里監(jiān)控盲區(qū)??脆荷，廢話不多說讓我們看看具體步驟
優(yōu)化前和優(yōu)化后速度對

優(yōu)化之前構建總耗時：241909ms·
構建時間：2021-05-14 15:55:48
開始構建----------------------
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構建結(jié)束----------------------
構建總耗時：241909ms

可以看到具體的耗時任務如上，主要是kapt相關的編譯和編譯kotlin代碼
優(yōu)化后構建總耗時：22751ms

構建時間：2021-05-14 16:11:02
開始構建----------------------
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[:component:Chatjoy:compileChatjoyLocalDevelopDebugKotlin]:1038ms
[:component:Chatjoy:compileChatjoyLocalDevelopDebugJavaWithJavac]:2849ms
[:component:Chatjoy:compileChatjoyLocalDevelopDebugSources]:0ms
[:component:Chatjoy:mergeChatjoyLocalDevelopDebugNativeDebugMetadata]:0ms
[:component:Chatjoy:mergeChatjoyLocalDevelopDebugShaders]:8ms
[:component:Chatjoy:compileChatjoyLocalDevelopDebugShaders]:0ms
[:component:Chatjoy:generateChatjoyLocalDevelopDebugAssets]:0ms
[:component:Chatjoy:mergeChatjoyLocalDevelopDebugAssets]:33ms
[:component:Chatjoy:compressChatjoyLocalDevelopDebugAssets]:16ms
[:component:Chatjoy:processChatjoyLocalDevelopDebugJavaRes]:0ms
[:component:Chatjoy:mergeChatjoyLocalDevelopDebugJavaResource]:790ms
[:component:Chatjoy:checkChatjoyLocalDevelopDebugDuplicateClasses]:42ms
[:component:Chatjoy:dexBuilderChatjoyLocalDevelopDebug]:2929ms
[:component:Chatjoy:mergeLibDexChatjoyLocalDevelopDebug]:20ms
[:component:Chatjoy:mergeProjectDexChatjoyLocalDevelopDebug]:91ms
[:component:Chatjoy:mergeChatjoyLocalDevelopDebugJniLibFolders]:430ms
[:component:Chatjoy:mergeChatjoyLocalDevelopDebugNativeLibs]:1875ms
[:component:Chatjoy:stripChatjoyLocalDevelopDebugDebugSymbols]:1093ms
[:component:Chatjoy:validateSigningChatjoyLocalDevelopDebug]:6ms
[:component:Chatjoy:writeChatjoyLocalDevelopDebugAppMetadata]:7ms
[:component:Chatjoy:writeChatjoyLocalDevelopDebugSigningConfigVersions]:7ms
[:component:Chatjoy:desugarChatjoyLocalDevelopDebugFileDependencies]:31ms
[:component:Chatjoy:mergeExtDexChatjoyLocalDevelopDebug]:736ms
[:component:Chatjoy:packageChatjoyLocalDevelopDebug]:1744ms
[:component:Chatjoy:assembleChatjoyLocalDevelopDebug]:0ms
構建結(jié)束----------------------
構建總耗時：22751ms

起飛了有木有哈哈懊悯！
優(yōu)化具體步驟
1.在gradle.properties添加如下配置

//開啟gradle并行編譯蜓谋，開啟daemon，調(diào)整jvm內(nèi)存大小
org.gradle.daemon=true
org.gradle.configureondemand=true
org.gradle.parallel=true
org.gradle.jvmargs=-Xmx4096m -XX:MaxPermSize=1024m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8

//開啟gradle緩存
org.gradle.caching=true
android.enableBuildCache=true

//開啟kotlin的增量和并行編譯
kotlin.incremental=true
kotlin.incremental.java=true
kotlin.incremental.js=true
kotlin.caching.enabled=true
kotlin.parallel.tasks.in.project=true //開啟kotlin并行編譯


//優(yōu)化kapt
kapt.use.worker.api=true //并行運行kapt1.2.60版本以上支持
kapt.incremental.apt=true //增量編譯 kapt1.3.30版本以上支持
//kapt avoiding 如果用kapt依賴的內(nèi)容沒有變化炭分，會完全重用編譯內(nèi)容桃焕，省掉最上圖中的:app:kaptGenerateStubsDebugKotlin的時間
kapt.include.compile.classpath=false

2.在app gradle添加如下配置

//kapt添加如下配置
kapt {
    useBuildCache = true
    javacOptions {
        option("-Xmaxerrs", 500)
    }
}

//在Android代碼塊中添加如下配置：（可優(yōu)化transformClassDexBuilderForDebug的時間）
    dexOptions {
        preDexLibraries true
        maxProcessCount 8
    }

以上就是優(yōu)化gradle編譯時間的配置.其他不太重要的優(yōu)化，好像對時間影響不算特別大捧毛。大家也可以根據(jù)自己的項目做針對優(yōu)化观堂。
查看自己項目中gradle編譯中具體所用的時間
1.創(chuàng)建buildTrace.gradle文件

import java.text.SimpleDateFormat

/**
 * 監(jiān)控構建耗時
 *
 * 記錄構建過程中的每個任務的耗時，并寫入文件中 .build_history/buildTimeLog_yy_MM_dd_HH_mm_ss.log中
 *
 * 使用時將文件放在app目錄下,然后在app/build.gradle中添加引用:
 * apply from: "./buildTrace.gradle"
 */

class BuildTimeListener implements TaskExecutionListener, BuildListener {
    private final String BUILD_LOG_FILE_DIR = ".build_history"
    private final String BUILD_LOG_FILE_PATH = "buildTimeLog"
    private long taskStartTime;
    private long buildStartTime;
    private int taskCounts = 0;
    private StringBuilder sb = new StringBuilder()
    private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
    private SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss")

    BuildTimeListener() {
        buildStartTime = System.currentTimeMillis()
        //添加一些版本信息
//        sb.append("codeTag:").append(ProjectConfig.codeTag).append("\n")
//        sb.append("branch:").append(ProjectConfig.branch).append("\n")
//        sb.append("versionName:").append(ProjectConfig.versionName).append("\n")
//        sb.append("versionCode:").append(ProjectConfig.versionCode).append("\n")
        sb.append("構建時間：" + sdf.format(new Date()) + "\n")
        sb.append("開始構建----------------------\n")
    }

    @Override
    void buildStarted(Gradle gradle) {

    }

    @Override
    void settingsEvaluated(Settings settings) {

    }

    @Override
    void projectsLoaded(Gradle gradle) {

    }

    @Override
    void projectsEvaluated(Gradle gradle) {

    }

    /**
     * 構建完成回調(diào)
     * @param result The result of the build. Never null.
     */
    @Override
    void buildFinished(BuildResult result) {
        if(taskCounts<5) return
        long buildCost = System.currentTimeMillis() - buildStartTime
        sb.append("構建結(jié)束----------------------\n")
        sb.append("構建總耗時：" + buildCost + "ms")
        //輸出到文件
        String text = sb.toString()
        writeToFile(BUILD_LOG_FILE_PATH, text)
    }

    /**
     * 任務執(zhí)行開始
     * @param task The task about to be executed. Never null.
     */
    @Override
    void beforeExecute(Task task) {
        taskStartTime = System.currentTimeMillis();
    }

    /**
     * 任務執(zhí)行結(jié)束
     * @param task The task which was executed. Never null.
     * @param state The task state. If the task failed with an exception, the exception is available in this
     */
    @Override
    void afterExecute(Task task, TaskState state) {
        long cost = System.currentTimeMillis() - taskStartTime;
        System.out.println("任務：" + task.name + "," + task.path + ",耗時：" + cost);
        sb.append("[" + task.path + "]:" + cost + "ms\n")
        taskCounts++
    }

    private void writeToFile(String fname, String text) {
        File dir = new File(BUILD_LOG_FILE_DIR)
        if (!dir.exists()) {
            dir.mkdir()
        }
        File file = new File(BUILD_LOG_FILE_DIR + File.separator + fname + "_" + sdf2.format(new Date()) + ".log")
        file.write(text, true)
    }
}

gradle.addListener new BuildTimeListener()

2.在app項目中引用

apply from: 'buildTrace.gradle'

大家如果有更好的方案呀忧，還請多多指教师痕！

?著作權歸作者所有,轉(zhuǎn)載或內(nèi)容合作請聯(lián)系作者

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Kotlin 讓人既愛有恨之編譯速度優(yōu)化

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