Jmeter瓶颈(Jmeter bottleneck)
我们有一个使用Jmeter测试的系统。 我们在Jmeter加速测试中遇到以下瓶颈：
症状：
- 我们每秒最多可以达到15个请求（rps）。
- 此限制是每个Java VM，而不是每台计算机。
- CPU不在极限，仅在ca. 30％。 该测试与请求一起进行了一些预处理和后处理，所以这可能是一个问题，但不是。
- 内存（带有3.5 GiB的计算机）在ca。 70％ - 80％。 这足以让rps略高，所以这不是限制。
- 内存（JVM）已根据建议进行设置，并且对其进行了各种尝试，但没有任何改进。
- 我也检查了TCP连接，从“使用保持活动”变为“不使用保持活动”并没有改善任何东西（不是预期的）。
- 所有（！）断言都被关闭。
- 日志记录：仅记录响应时间，响应时间百分比，吞吐量和请求率，以及jmeter的标准表输出。
- 所有日志文件都保存到本地硬盘。
Jmeter通过jmeter.bat脚本启动，其中包含JVM的以下设置：
set HEAP=-Xms768m -Xmx768m -Xss128k set NEW=-XX:NewSize=256m -XX:MaxNewSize=256m set SURVIVOR=-XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=50% set TENURING=-XX:MaxTenuringThreshold=2 set RMIGC=-Dsun.rmi.dgc.client.gcInterval=600000 -Dsun.rmi.dgc.server.gcInterval=600000 set PERM=-XX:PermSize=256m -XX:MaxPermSize=256m set DUMP=-XX:+HeapDumpOnOutOfMemoryError set DDRAW= set ARGS=%DUMP% %HEAP% %NEW% %SURVIVOR% %TENURING% %RMIGC% %PERM% %DDRAW% %JM_START% %JM_LAUNCH% %ARGS% %JVM_ARGS% -jar "%JMETER_BIN%ApacheJMeter.jar" %JMETER_CMD_LINE_ARGS%jmeter.properties具有以下内容：
language=en cookies=cookies xml.parser=org.apache.xerces.parsers.SAXParser jmeter.laf.mac=System jmeter.loggerpanel.maxlength=5000 not_in_menu=HTML Parameter Mask,HTTP User Parameter Modifier remote_hosts=127.0.0.1 log_level.jmeter=ERROR log_level.jmeter.junit=ERROR log_level.jorphan=WARN log_file='c:\\temp\\jmeter_'yyyyMMdd'.log' jmeter.save.saveservice.timestamp_format=yyyy/MM/dd HH:mm:ss jmeter.save.saveservice.base_prefix=~/ sampleresult.timestamp.start=true upgrade_properties=/bin/upgrade.properties HTTPResponse.parsers=htmlParser wmlParser htmlParser.types=text/html application/xhtml+xml application/xml text/xml wmlParser.className=org.apache.jmeter.protocol.http.parser.RegexpHTMLParser wmlParser.types=text/vnd.wap.wml summariser.interval=180 summariser.log=true summariser.out=true beanshell.server.file=../extras/startup.bsh time.YMDHMS=yyyyMMdd_HHmmss onload.expandtree=true view.results.tree.max_size=0 classfinder.functions.contain=.functions. classfinder.functions.notContain=.gui. user.properties=user.properties system.properties=system.properties在
jmx，指定了以下设置：<stringProp name="ThreadGroup.num_threads">300</stringProp> <stringProp name="ThreadGroup.ramp_time">0</stringProp> <stringProp name="ThreadGroup.ramp_time">0</stringProp> <longProp name="ThreadGroup.start_time">1404986400000</longProp> <longProp name="ThreadGroup.end_time">1404990000000</longProp> <boolProp name="ThreadGroup.scheduler">false</boolProp> <stringProp name="ThreadGroup.duration">3600</stringProp> <stringProp name="ThreadGroup.delay"></stringProp> <boolProp name="ThreadGroup.delayedStart">true</boolProp>问题 ：瓶颈在哪里，我们如何摆脱它？
We have a system which we are testing using Jmeter. We experience the following bottleneck in our Jmeter ramp-up test:
Symptoms:
- We reach a maximum of 15 requests per second (rps).
- This limit is per Java VM, not per computer.
- CPU is not at its limit, only at ca. 30%. The test does quite some pre- and post-processing together with the requests, so this could have been a problem, but isn’t.
- Memory (computer with 3.5 GiB) is at ca. 70% - 80%. This is sufficient to go somewhat higher with the rps, so this is not the limit.
- Memory (JVM) has been set according to the recommendations, and also been varied to experiment with it, but no improvement.
- I also checked the TCP connections, a change from “use keep-alive” to “don’t use keep-alive” hasn’t improved anything (was not to be expected).
- All(!) assertions are switched off.
- Logging: Only response times, response times percentiles, throughput, and request rate are logged, together with the standard table output of jmeter.
- All log files are saved to the local hard disk.
Jmeter is started over a jmeter.bat script with thefollowing settings for the JVM:
set HEAP=-Xms768m -Xmx768m -Xss128k set NEW=-XX:NewSize=256m -XX:MaxNewSize=256m set SURVIVOR=-XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=50% set TENURING=-XX:MaxTenuringThreshold=2 set RMIGC=-Dsun.rmi.dgc.client.gcInterval=600000 -Dsun.rmi.dgc.server.gcInterval=600000 set PERM=-XX:PermSize=256m -XX:MaxPermSize=256m set DUMP=-XX:+HeapDumpOnOutOfMemoryError set DDRAW= set ARGS=%DUMP% %HEAP% %NEW% %SURVIVOR% %TENURING% %RMIGC% %PERM% %DDRAW% %JM_START% %JM_LAUNCH% %ARGS% %JVM_ARGS% -jar "%JMETER_BIN%ApacheJMeter.jar" %JMETER_CMD_LINE_ARGS%jmeter.properties has the following content:
language=en cookies=cookies xml.parser=org.apache.xerces.parsers.SAXParser jmeter.laf.mac=System jmeter.loggerpanel.maxlength=5000 not_in_menu=HTML Parameter Mask,HTTP User Parameter Modifier remote_hosts=127.0.0.1 log_level.jmeter=ERROR log_level.jmeter.junit=ERROR log_level.jorphan=WARN log_file='c:\\temp\\jmeter_'yyyyMMdd'.log' jmeter.save.saveservice.timestamp_format=yyyy/MM/dd HH:mm:ss jmeter.save.saveservice.base_prefix=~/ sampleresult.timestamp.start=true upgrade_properties=/bin/upgrade.properties HTTPResponse.parsers=htmlParser wmlParser htmlParser.types=text/html application/xhtml+xml application/xml text/xml wmlParser.className=org.apache.jmeter.protocol.http.parser.RegexpHTMLParser wmlParser.types=text/vnd.wap.wml summariser.interval=180 summariser.log=true summariser.out=true beanshell.server.file=../extras/startup.bsh time.YMDHMS=yyyyMMdd_HHmmss onload.expandtree=true view.results.tree.max_size=0 classfinder.functions.contain=.functions. classfinder.functions.notContain=.gui. user.properties=user.properties system.properties=system.propertiesAt the
jmxthe following settings have been specified:<stringProp name="ThreadGroup.num_threads">300</stringProp> <stringProp name="ThreadGroup.ramp_time">0</stringProp> <stringProp name="ThreadGroup.ramp_time">0</stringProp> <longProp name="ThreadGroup.start_time">1404986400000</longProp> <longProp name="ThreadGroup.end_time">1404990000000</longProp> <boolProp name="ThreadGroup.scheduler">false</boolProp> <stringProp name="ThreadGroup.duration">3600</stringProp> <stringProp name="ThreadGroup.delay"></stringProp> <boolProp name="ThreadGroup.delayedStart">true</boolProp>Question: Where is the bottleneck, and how can we get rid of it?
原文：https://stackoverflow.com/questions/30866466
更新时间：2022-05-21 15:05
最满意答案
你错过了很多东西，我很乐意向你解释。
这里
def total_number_of_comments @article = Article.all @comments_total = @article.comments.count end你必须这样做
def total_number_of_comments @comments_total = Comment.all.count // simple solution end接下来，您没有使用适当的实例变量。
def total_number_of_articles @articles_total = Article.total_number_of_articles end看你自己
文章总数：
<%= @total_number_of_articles %> // this is wrong您指定了
@articles_total但使用了@total_number_of_articles。 如果你使用@articles_total它会工作正常。There are many things you missed, I would happy to explain you.
Here
def total_number_of_comments @article = Article.all @comments_total = @article.comments.count endYou have to do this
def total_number_of_comments @comments_total = Comment.all.count // simple solution endNext is , you didn't used proper instance variable.
def total_number_of_articles @articles_total = Article.total_number_of_articles endSee yourself
Total number of articles:
<%= @total_number_of_articles %> // this is wrongYou assigned
@articles_totalbut used@total_number_of_articles. if you use@articles_totalit will work fine.
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