FWD » Core Development » Database

In order to improve the performance of the persistence layer of FWD, we first need to measure the time spent at several levels of the API, to identify bottlenecks. This can be accomplished through sampling, profiling (tracing), logging, and special purpose instrumentation, which may be temporary or permanent.

This task is about instrumenting the FWD persistence runtime and its supporting libraries to record such measurements.

Persistence performance should be measured at several key boundaries, such that we know the time being spent between each corresponding enter/return pair below:

• FWD persistence API (enter)
  • Hibernate API (enter)
    • JDBC API (enter)
      • socket/network (enter)
        • PostgreSQL server (enter)
          • parse/prepare work
          • execute work
        • PostgreSQL server (return)
      • socket/network (return)
    • JDBC API (return)
  • Hibernate API (return)
• FWD persistence API (return)

We have some existing logging in the Persistence class, but this needs to be updated to use high resolution timing, and to increase API coverage. I think currently only the query APIs are covered.

The facilities available at the Hibernate and the JDBC driver levels need to be explored, though I suspect we will be adding instrumentation there as well (probably temporarily).

Task branch 4056a has been created for this work.

Eric Faulhaber wrote:

Hynek, I am using AspectJ to capture method-level profile data (just number of invocations and aggregate elapsed time for now).

My prototype aspect defines execution pointcuts for all public methods by package (e.g., execution(public * com.goldencode.p2j.persist.*.*(..))). This works fine for FWD classes, but I understand that to make it work for third party classes (e.g., Hibernate, the JDBC driver, etc.) without recompiling them, I need to enable load-time weaving. Do you have any example of this already in FWD? Do you have any concern that this would introduce too much overhead for an aspect whose only purpose is to capture profile information?

Yes, I use load-time weaving for running the uast test cases directly from my IDE. The reason was that I had some troubles with using the aspect compiler from the IDE. To enable load-time weaving (1) add -javaagent:/your-path-to/aspectjweaver.jar to your VM command line options. And (2) add META-INF/aop.xml to your class path (the simplest is to add it to the fwd.jar). With the aop.xml you define your aspects and include/exclude the target classes. The format is pretty straight forward, see my aop.xml below.

<aspectj>
    <aspects>
        <aspect name="com.goldencode.p2j.aspects.ui.SyncConfigChangesAspect"/>
        <aspect name="com.goldencode.p2j.aspects.ui.ConfigFieldSetterAspect"/>
        <aspect name="com.goldencode.p2j.aspects.ui.SyncCoordinatesAspect"/>
        <aspect name="com.goldencode.p2j.aspects.ui.UIStatementsAspect"/>
        <aspect name="com.goldencode.p2j.ui.client.widgetbrowser.WidgetBrowserAspect"/>
    </aspects>

<!-- this is useful when debugging the weaving process
    <weaver options="-verbose -showWeaveInfo">
        <include within="com.goldencode..*"/>
    </weaver>
-->

    <weaver>
        <include within="com.goldencode..*"/>
        <exclude within="*FieldAccess"/>
        <exclude within="*MethodAccess"/>
    </weaver>

</aspectj>

As of load-time performance, the FWD start time overhead for the aop.xml above is negligible. For runtime performance it is hard to say. Obviously it will depend on the complexity of the profiling logic as well as the call frequency of the monitored methods.

Hynek Cihlar wrote:

Eric Faulhaber wrote:

Hynek, I am using AspectJ to capture method-level profile data (just number of invocations and aggregate elapsed time for now).

My prototype aspect defines execution pointcuts for all public methods by package (e.g., execution(public * com.goldencode.p2j.persist.*.*(..))). This works fine for FWD classes, but I understand that to make it work for third party classes (e.g., Hibernate, the JDBC driver, etc.) without recompiling them, I need to enable load-time weaving. Do you have any example of this already in FWD? Do you have any concern that this would introduce too much overhead for an aspect whose only purpose is to capture profile information?

Yes, I use load-time weaving for running the uast test cases directly from my IDE. The reason was that I had some troubles with using the aspect compiler from the IDE. To enable load-time weaving (1) add -javaagent:/your-path-to/aspectjweaver.jar to your VM command line options. And (2) add META-INF/aop.xml to your class path (the simplest is to add it to the fwd.jar). With the aop.xml you define your aspects and include/exclude the target classes. The format is pretty straight forward, see my aop.xml below.

[...]

I'm not sure how well you can combine load-time and compile-time weaving. I would say you should not include the aspects that have been weaved during compile. So if you run FWD from the standard fwd.jar, only include your new aspect(s) in the <aspect> element in aop.xml. Also you should leave the excludes in <weaver> XML element, these are for ReflectASM.

Here is more info on load time weaving http://www.eclipse.org/aspectj/doc/released/devguide/ltw.html.

Thank you for the guidance.

I am using compile-time weaving only because that seemed to be the most direct way to get started understanding the framework. Also, it seemed intuitive that the runtime overhead using compile-time weaving would be lower than load-time weaving. Do I need to fundamentally change my aspect implementation to use only load-time weaving? Currently, it consists of several (empty) pointcut method definitions to specify the methods I want to profile (by package) and an @Around advice which does the data collection work. The target packages will not change often, if at all, and it is ok to recompile FWD to update them (see below).

I should have mentioned: it is necessary to have zero overhead for production/normal use, so the intention is to have this infrastructure entirely disabled by default and only built into FWD when a particular ant/gradle target is used to build. I haven't worked this part out yet, but is anything in the approach you outline above likely to make the "disabled by default" goal harder to achieve? I hadn't initially considered the XML file approach, given there is no deploy-time configuration need. I had been looking at the custom classloader approach initially, but I hadn't gotten too far down that road before I realized I needed some advice. I'm quite new to the framework, so I hadn't settled on any particular approach yet.

Eric Faulhaber wrote:

Thank you for the guidance.

I am using compile-time weaving only because that seemed to be the most direct way to get started understanding the framework. Also, it seemed intuitive that the runtime overhead using compile-time weaving would be lower than load-time weaving. Do I need to fundamentally change my aspect implementation to use only load-time weaving?

I don't think the aspect implementation should change in any way for LTW.

I should have mentioned: it is necessary to have zero overhead for production/normal use, so the intention is to have this infrastructure entirely disabled by default and only built into FWD when a particular ant/gradle target is used to build. I haven't worked this part out yet, but is anything in the approach you outline above likely to make the "disabled by default" goal harder to achieve? I hadn't initially considered the XML file approach, given there is no deploy-time configuration need. I had been looking at the custom classloader approach initially, but I hadn't gotten too far down that road before I realized I needed some advice. I'm quite new to the framework, so I hadn't settled on any particular approach yet.

I don't know if there is any advantage of using the custom class loader approach over the aop.xml file. The zero-overhead could be achieved during build by either including the aop.xml in the target jar or not.

Hynek Cihlar wrote:

I'm not sure how well you can combine load-time and compile-time weaving.

Actually, I did nothing explicitly to enable compile-time weaving. The profile data collection just worked (for FWD classes only, not third party classes) when I added my aspect class to the com.goldencode.p2j.aspects package, presumably because you previously set it up.

I would say you should not include the aspects that have been weaved during compile.

I only have one aspect currently, which is intended to do the same thing whether a method is in a FWD class or in a third party class. How do I exclude this from compile-time weaving, so I can use it with load-time weaving? As noted above, it already seems to be part of the compile-time weaving you've enabled previously.

So if you run FWD from the standard fwd.jar, only include your new aspect(s) in the <aspect> element in aop.xml. Also you should leave the excludes in <weaver> XML element, these are for ReflectASM.

Ok.

Eric Faulhaber wrote:

Hynek Cihlar wrote:

I'm not sure how well you can combine load-time and compile-time weaving.

Actually, I did nothing explicitly to enable compile-time weaving. The profile data collection just worked (for FWD classes only, not third party classes) when I added my aspect class to the com.goldencode.p2j.aspects package, presumably because you previously set it up.

I would say you should not include the aspects that have been weaved during compile.

I only have one aspect currently, which is intended to do the same thing whether a method is in a FWD class or in a third party class. How do I exclude this from compile-time weaving, so I can use it with load-time weaving? As noted above, it already seems to be part of the compile-time weaving you've enabled previously.

How about to exclude the FWD classes in aop.xml? So that the FWD classes are only weaved by the compiler. Also I found this in the documentation, "As of AspectJ 5 aspects (code style or annotation style) and woven classes are reweavable by default.".

Hynek Cihlar wrote:

How about to exclude the FWD classes in aop.xml? So that the FWD classes are only weaved by the compiler.

This makes sense for this purpose, but is it potentially limiting for future use? I mean, the excludes seem to apply to all aspects (current and future) included in the <aspects> element. But, I guess it would make sense to compile-time weave the FWD classes for anything for which we would write new aspects in the future, for the same reason we are doing it now. In this case, I still need to exclude this aspect from the default FWD build, since excluding the aop.xml file from the jar would not be enough to disable it.

I assume your example XML above is illustrative, and I do not need to include the existing UI aspects in the <aspects> element, since they are compile-time weaved. Correct?

So, my XML would look something like this:

<aspectj>
    <aspects>
        <aspect name="com.goldencode.p2j.aspects.MethodProfileAspect"/>
    </aspects>

<!-- this is useful when debugging the weaving process
    <weaver options="-verbose -showWeaveInfo">
        <include within="com.goldencode..*"/>
    </weaver>
-->

    <weaver>
        <exclude within="com.goldencode..*"/>
        <exclude within="*FieldAccess"/>
        <exclude within="*MethodAccess"/>
    </weaver>

</aspectj>

Is that what you meant?

Also I found this in the documentation, "As of AspectJ 5 aspects (code style or annotation style) and woven classes are reweavable by default.".

I noticed that, but I wasn't sure what it meant. I think I understand now.

Eric Faulhaber wrote:

Hynek Cihlar wrote:

How about to exclude the FWD classes in aop.xml? So that the FWD classes are only weaved by the compiler.

This makes sense for this purpose, but is it potentially limiting for future use? I mean, the excludes seem to apply to all aspects (current and future) included in the <aspects> element. But, I guess it would make sense to compile-time weave the FWD classes for anything for which we would write new aspects in the future, for the same reason we are doing it now. In this case, I still need to exclude this aspect from the default FWD build, since excluding the aop.xml file from the jar would not be enough to disable it.

True, the aspect itself should also be removed from the build to have the "disabled-by-default" logic. We do the same with WidgetBrowserAspect class, see widget.browser.exclude-path in build.xml.

I assume your example XML above is illustrative, and I do not need to include the existing UI aspects in the <aspects> element, since they are compile-time weaved. Correct?

Correct.

So, my XML would look something like this:

[...]

Is that what you meant?

Yes. You may also need to add the include XML elements to narrow the search for the classes to be woven and improve load times.

This looks very useful. Some suggested improvements for the output:

• Instead of Agg Time use Agg Time (nanosec) so that the reader doesn't have to know the scale.
• Add a % of Total column for each of the "beneath" buckets. This allows the reader to avoid some mental math to get the sense of the contribution to the total Persistence number.
• Add a Totals row that accumulates/calculates the multiple Agg Time (nanosec), Count and % of Total columns.
• Add a row at the bottom that reports the total time that tracing was active (the nanoseconds between -m1 and -m0@). When the user matches testing with "quick" enable/disable of tracing, then this number will be very close to the total amount of time for the test scenario. Having that included with the tracing results is better than trying to remember the context separately. In cases where it doesn't match, you aren't losing anything. The user can always edit the output to save the real number. But in cases where it is close, then this allows future review of the results to be more effective.

I've added all the suggested features except the Totals row (will add in a separate pass). I've rebased 4056a to trunk rev 11315. Current branch revision is 11318.

Hynek, AspectJ is executing a join point for methods outside the scope I am trying to define. For instance, this dynamic proxy method:

public final void com.sun.proxy.$Proxy13.invalidate()

My aop.xml looks like this:

<aspectj>

   <aspects>
      <!-- a concrete aspect to define the abstract MethodTraceAspect.scope() pointcut -->
      <concrete-aspect name="com.goldencode.p2j.aspects.ltw.__MethodTraceAspect" 
                       extends="com.goldencode.p2j.aspects.ltw.MethodTraceAspect">
         <pointcut name="scope" 
                   expression="execution(* com.goldencode.p2j.persist..*.*(..))
                            || execution(* org.hibernate..*.*(..))
                            || execution(* org.postgresql..*.*(..))
                            || execution(* org.h2..*.*(..))
                            || execution(* com.mchange..*.*(..))" 
         />
      </concrete-aspect>
   </aspects>

<!-- this is useful when debugging the weaving process>
   <weaver options="-verbose -showWeaveInfo"/>
-->

   <weaver>
      <exclude within="com.goldencode.p2j.aspects.ui..*"/>
      <exclude within="com.goldencode.p2j.ui..*"/>
      <exclude within="*FieldAccess"/>
      <exclude within="*MethodAccess"/>
      <exclude within="com.goldencode.p2j.persist.TableWrapper"/>
      <exclude within="com.goldencode.p2j.persist.PropertyDefinition"/>
   </weaver>

</aspectj>

Based on it hitting the public final void com.sun.proxy.$Proxy13.invalidate() pointcut above, and the fact that I had to explicitly exclude com.goldencode.p2j.aspects.ui..* and com.goldencode.p2j.ui..*, AspectJ seems to be load-time weaving more than I want. I'm just trying to run my aspect against the methods in:

com.goldencode.p2j.persist.*
org.hibernate.*
org.postgresql.*
org.h2.*
com.mchange.*

These do seem to be woven, but it seems to be doing much more than this scope. Any idea why it's load-time-weaving more than this, based on my configuration above?

com.goldencode.p2j.aspects.ltw.MethodTraceAspect is an abstract class, with an abstract pointcut defined as follows:

   @Pointcut
   public abstract void scope();

The abstract class/aspect is overridden by the concrete aspect com.goldencode.p2j.aspects.ltw.__MethodTraceAspect, defined in aop.xml above.

Eric Faulhaber wrote:

Hynek, AspectJ is executing a join point for methods outside the scope I am trying to define. For instance, this dynamic proxy method:

Eric, did you try to enable the -verbose -showWeaveInfo weaver options in aop.xml? Maybe it will give some clues.

It told me that the com.sun.proxy.* join point weaves were ... advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java). However, I still don't really understand why. Anyway, I added an exclude directive explicitly for these and it no longer weaves them.

Task branch 4056a has been rebased to trunk rev 11322.

I could set-up this feature with 3821c/rev.14305 and Hotel GUI. I am starting a standard server and then I attach the method tracing using server.sh -a -m1. The good part is that I get the following message in the standard server:

Method profiling is enabled; this feature is not intended for production use!

[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(int com.goldencode.p2j.persist.Database.hashCode())' in Type 'com.goldencode.p2j.persist.Database' (Database.java:279) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(boolean com.goldencode.p2j.persist.Database.equals(java.lang.Object))' in Type 'com.goldencode.p2j.persist.Database' (Database.java:310) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(java.lang.String com.goldencode.p2j.persist.Database.toString())' in Type 'com.goldencode.p2j.persist.Database' (Database.java:355) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(java.lang.String com.goldencode.p2j.persist.Database.getName())' in Type 'com.goldencode.p2j.persist.Database' (Database.java:383) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(java.lang.String com.goldencode.p2j.persist.Database.getId())' in Type 'com.goldencode.p2j.persist.Database' (Database.java:393) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(java.net.InetSocketAddress com.goldencode.p2j.persist.Database.getSocketAddress())' in Type 'com.goldencode.p2j.persist.Database' (Database.java:405) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(boolean com.goldencode.p2j.persist.Database.isLocal())' in Type 'com.goldencode.p2j.persist.Database' (Database.java:420) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(com.goldencode.p2j.persist.Database$Type com.goldencode.p2j.persist.Database.getType())' in Type 'com.goldencode.p2j.persist.Database' (Database.java:435) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(boolean com.goldencode.p2j.persist.Database.isPrimary())' in Type 'com.goldencode.p2j.persist.Database' (Database.java:445) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(boolean com.goldencode.p2j.persist.Database.isDirty())' in Type 'com.goldencode.p2j.persist.Database' (Database.java:455) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(boolean com.goldencode.p2j.persist.Database.isMeta())' in Type 'com.goldencode.p2j.persist.Database' (Database.java:465) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(void com.goldencode.p2j.persist.Database.writeExternal(java.io.ObjectOutput))' in Type 'com.goldencode.p2j.persist.Database' (Database.java:480) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(void com.goldencode.p2j.persist.Database.readExternal(java.io.ObjectInput))' in Type 'com.goldencode.p2j.persist.Database' (Database.java:501) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(com.goldencode.p2j.persist.Database$Type[] com.goldencode.p2j.persist.Database$Type.values())' in Type 'com.goldencode.p2j.persist.Database$Type' (Database.java:105) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(com.goldencode.p2j.persist.Database$Type com.goldencode.p2j.persist.Database$Type.valueOf(java.lang.String))' in Type 'com.goldencode.p2j.persist.Database$Type' (Database.java:105) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(int com.goldencode.p2j.persist.Database$Type.getId())' in Type 'com.goldencode.p2j.persist.Database$Type' (Database.java:133) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(long com.goldencode.p2j.persist.DatabaseConfig.getDeactivateIfNotUsedSec())' in Type 'com.goldencode.p2j.persist.DatabaseConfig' (DatabaseConfig.java:146) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(boolean com.goldencode.p2j.persist.DatabaseConfig.isUseJavaUDFs())' in Type 'com.goldencode.p2j.persist.DatabaseConfig' (DatabaseConfig.java:155) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(com.goldencode.p2j.persist.orm.Settings com.goldencode.p2j.persist.DatabaseConfig.getOrmSettings())' in Type 'com.goldencode.p2j.persist.DatabaseConfig' (DatabaseConfig.java:165) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(java.lang.String com.goldencode.p2j.persist.DatabaseConfig.getSchema())' in Type 'com.goldencode.p2j.persist.DatabaseConfig' (DatabaseConfig.java:175) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(void com.goldencode.p2j.persist.DatabaseConfig.writeExternal(java.io.ObjectOutput))' in Type 'com.goldencode.p2j.persist.DatabaseConfig' (DatabaseConfig.java:190) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(void com.goldencode.p2j.persist.DatabaseConfig.readExternal(java.io.ObjectInput))' in Type 'com.goldencode.p2j.persist.DatabaseConfig' (DatabaseConfig.java:209) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(void com.goldencode.p2j.persist.DatasetWrapper.setUseBeforeImage(boolean))' in Type 'com.goldencode.p2j.persist.DatasetWrapper' (DatasetWrapper.java:192) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(boolean com.goldencode.p2j.persist.DatasetWrapper.isUseBeforeImage())' in Type 'com.goldencode.p2j.persist.DatasetWrapper' (DatasetWrapper.java:202) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(void com.goldencode.p2j.persist.DatasetWrapper.setXmlDataset(java.lang.String))' in Type 'com.goldencode.p2j.persist.DatasetWrapper' (DatasetWrapper.java:213) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(java.lang.String com.goldencode.p2j.persist.DatasetWrapper.getXmlDataset())' in Type 'com.goldencode.p2j.persist.DatasetWrapper' (DatasetWrapper.java:223) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(boolean com.goldencode.p2j.persist.DatasetWrapper.isAsXml())' in Type 'com.goldencode.p2j.persist.DatasetWrapper' (DatasetWrapper.java:233) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(void com.goldencode.p2j.persist.DatasetWrapper.setAsXml(boolean))' in Type 'com.goldencode.p2j.persist.DatasetWrapper' (DatasetWrapper.java:244) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(com.goldencode.p2j.persist.DataSetContainer com.goldencode.p2j.persist.DatasetWrapper.getResource())' in Type 'com.goldencode.p2j.persist.DatasetWrapper' (DatasetWrapper.java:254) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(java.util.List com.goldencode.p2j.persist.DatasetWrapper.getTableDefs())' in Type 'com.goldencode.p2j.persist.DatasetWrapper' (DatasetWrapper.java:264) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(java.util.List com.goldencode.p2j.persist.DatasetWrapper.getRelationsDefs())' in Type 'com.goldencode.p2j.persist.DatasetWrapper' (DatasetWrapper.java:275) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(boolean com.goldencode.p2j.persist.DatasetWrapper.isInput())' in Type 'com.goldencode.p2j.persist.DatasetWrapper' (DatasetWrapper.java:287) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
[AppClassLoader@18b4aac2] weaveinfo Join point 'method-execution(boolean com.goldencode.p2j.persist.DatasetWrapper.isOutput())' in Type 'com.goldencode.p2j.persist.DatasetWrapper' (DatasetWrapper.java:305) advised by around advice from 'com.goldencode.p2j.aspects.ltw.__MethodTraceAspect' (MethodTraceAspect.java)
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• "A class loader may only weave classes that it defines. It may not weave classes loaded by a delegate or parent class loader." is a statement from the aspectj documentation of LTW. I am not sure how our com.goldencode.p2j.classloader.MultiClassLoader is interferring with this statement, but it doesn't really make sense to weave persist.Database and omit persist.AdaptiveQuery for instance.
• The last debug line from the weaving process is [AppClassLoader@18b4aac2] debug not weaving 'com.sun.proxy.$Proxy2'. Maybe this attempt silently halts the weaving process such that the other persist classes are not weaved.

Any hints into this matter?

Eric Faulhaber wrote:

For reference, I am attaching another trace.csv file that was generated after implementing most of the improvements Greg suggested in #4056-13. This one also was created using the Hotel GUI application, though I don't remember the activity within the application while tracing was enabled.

The top priority is getting the trace data collection working again, but beyond that, if you have ideas about a better way to organize the trace data for analysis, I am open to them. The current format is difficult to review. At a high level, we are looking for an understanding of how the time spent in the persistence layer is allocated among the packages we are specifying, and the current output does that. But I am also interested in ways we could present the detailed data better.

The queries (adaptive, preselect or compound) are not considered for "debug weaving" nor for "debug not weaving" (basically they are not visible?):
...
Any hints into this matter?

I think this was by design. The idea of this particular kind of tracing was that we must only detect entrance to the persistence layer from outside of that layer. We don't want to capture data from internal calls within the persistence layer. This was because we were trying to measure the total time spent in persistence and below (at the time, Hibernate, PostgrSQL and H2). Method level tracing is very expensive and distorts the results, so we wanted to minimize the impact. I recall there was a lot of work involved to identify external calls from internal calls at runtime.

Eric: Am I mis-remembering?

• run server.sh to normally start an server without any kind of tracing
• run server.sh -a to start a server which is weaved and ready for method tracing
• run server.sh -m1 to enable the method tracing on the server started with -a
• run server.sh -m0 to disable the method tracing on the server started with -a. This also generates a csv with the results.

You are right, there seems to be more methods weaved than expected. Even if this is not a sound solution, at least it is complete.
Note that I am also capturing AdaptiveQuery for instance, but only AdaptiveQuery.initialize. This confirms the fact that only the entry points in the "persistence" package are traced (maybe this is motivation for all the logic inside @MethodTraceAspect indeed).

Committed 3821c/rev.14313. Added AspectJ on com.goldencode.p2j.persist.orm subpackage while keeping com.goldencode.p2j.persist..

I removed the reference to Hibernate from aop.xml and made a change to MethodTraceAspect.matchBucket. Instead of returning the first bucket that it finds, it will return the best match (if any) from all the existent buckets. It is important to mention that, if we want to test a subpackage, it needs to placed under the parent package in the buckets array (or lower). This doesn't cause any problems, but it provides a more understandable layout when writing the trace.csv file.

I will update Profiling wiki with a setup for Method Tracing soon.

Dănuț Filimon wrote:

Committed 3821c/rev.14313. Added AspectJ on com.goldencode.p2j.persist.orm subpackage while keeping com.goldencode.p2j.persist..

Please commit the same update to branch 6129b today. Thank you.

In the profiling wiki, there is a section stubbed out for an HTML UI. What does that entail? Has implementation of that begun? What is the estimated effort? I don't want to try to re-invent the wheel when it comes to CPU tracing, since there are products that do that already and do it well. But if we can make the data collected by this implementation a bit easier to view/interpret with a modest effort, that would be a welcome improvement.

Eric Faulhaber wrote:

Please commit the same update to branch 6129b today. Thank you.

Done it in 6129b/rev. 14306.

In the profiling wiki, there is a section stubbed out for an HTML UI. What does that entail?

It took a bit of time to understand the layout of the results in the CSV. I am working on an exportToHTML method in the aspect to split the tracing per scenario/bucket in separate files (in a trace folder). Based on this structure, these can be displayed through a simple Web page.

Has implementation of that begun?

• Integrate per bucket totals
• Cutting out scenarios which have an own time < 1ms.
• Computing an overall time per scenario (the sum of all buckets per FWD API interaction)
• Allowing the client-based sorting of trace methods
• Edited: Add something like org.h2. (5) to symbolize that 5 methods were traced in the org.h2. package

What is the estimated effort? I don't want to try to re-invent the wheel when it comes to CPU tracing, since there are products that do that already and do it well. But if we can make the data collected by this implementation a bit easier to view/interpret with a modest effort, that would be a welcome improvement.

I feel like they are more than a "bit easier" to interpret right now. I am keen on finishing this by the end of this day.

Alexandru Lungu wrote:

Eric Faulhaber wrote:

Please commit the same update to branch 6129b today. Thank you.

Done it in 6129b/rev. 14306.

Thank you.

I feel like they are more than a "bit easier" to interpret right now. I am keen on finishing this by the end of this day.

Great! I look forward to trying it.

Committed 6129b/rev. 14307 including the new support for the HTML presentation of the method tracing data. There are still bits to be added, but the interface is now fully functional.
It was a bit challenging to provide this solution without requiring a file server (so I had to rework the approach). The modern browsers' CORS policy didn't allow the dynamic loading of data through import or fetch from JS. Therefore, most of the JS is included statically in the index.html. Also, all of the files are generated from the Java code (JS, CSS, HTML). Once the method tracing is complete, enter deploy/server/trace/index.html; it should work out-of-the-box (also ensure JS is enabled for the page). Including the documentation now in the wiki section.

Alexandru, I like the HTML UI, nice work! Is the Grand Totals by package breakdown somewhere in there?

For a large customer application, here is the package breakdown from the CSV:

Note that the percentages add up to >100%. This defect probably dates back to my original implementation. Can you please find and fix the problem?

The aggregate times per bucket are not displayed yet; working on it.
I will check how the sums are computed (and the totals) to ensure correctness.

I have a slight issue right now. I can't test Hotel GUI with 6129b because:

com.goldencode.p2j.persist.PersistenceException: Failed to execute [SELECT COUNT(*) FROM meta_user WHERE upper(rtrim(_userid)) = upper(rtrim(?)) AND _password = ?]
Caused by: org.postgresql.util.PSQLException: ERROR: column "_userid" does not exist
  Hint: Perhaps you meant to reference the column "meta_user.userid".

Maybe I should change something in my Hotel GUI project to make it compatible with 6129b? If this is too complex, I can continue developing on another branch and commit my changes to 6129b, as they are not that intrusive to require branch-specific testing.

Extended the method tracing with a new file: summary_trace.csv including

• Summary table of scenarios: root, count, own time, % of time. Also attached own time and % of time for each package used from the root.
• A list of all methods called by the tracing with count and own time.
• A list of grand totals (*fixed)
• No negative own times are generated: this was caused by closing method tracing before methods stop. In this case, the sub-calls were sub-tracing time from a not-ended method (which has total time 0). Fixed this by presuming for this scenarios that the own time is 0, so the total time equals the time of the sub-calls.
• Grand total is computed in regard to the profiled packages and not the total elapsed time. There may be a package which is not included by the method tracing. Therefore, some times are not captured by the CSV. Can't detect very easily which packages are used but not captured.
• The total time of traced methods equal the total time spent in the buckets. The sum of the aggregate time however is a bit lower - investigating.

I've fixed the issue with the wrong times - the thread-local must be static, for it to work as 'thread-local'. See 6129b/14312.

I've committed to 6129b/14318 the changes in DatasetWrapper (serialization ID) and SortIndex (made the class public), which were needed for some cases of the AOP method tracing to work.