Databases
StackOverflow2013
Postsdbo
POIs there a cookbook guide for GC problems?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POIs there a cookbook guide for GC problems?
    primarykey
    data
    text
    <p>Almost everyone eventually runs into GC issues with Java.</p> <p>Is there a cookbook guide or semi-automated tool to tune GC for Java?</p> <p>My rationale is this:</p> <ul> <li>Almost anyone eventually has these problems</li> <li>There are many possible factors (say 20) out of which only a few affect your problem.</li> <li>Most people don't know how to identify the key factors so GC tuning is more like a black art than a science.</li> <li>Not everyone uses a HotSpot VM. Different Sun versions have different GC characteristics.</li> <li>There is little incentive to experiment (like run the VM with slightly different settings every day to see how they play out).</li> </ul> <p>So the question really is: Is there something that I can use in a check-list manner? Or maybe even a tool that analyzes GC logs or heap dumps and gives me specific hints where to look (instead of telling me "95% of the data is allocated in objects of the type byte[]" which is basically useless).</p> <p>Related questions:</p> <ul> <li><a href="https://stackoverflow.com/questions/202502/appropriate-tomcat-5-5-start-up-parameters-to-tune-jvm-for-extremely-high-demand/202555#202555">Appropriate Tomcat 5.5 start-up parameters to tune JVM for extremely high demand, large heap web application?</a> which is very specific. My question is more wide.</li> <li><a href="https://stackoverflow.com/questions/1804186/what-are-the-best-garbage-collection-settings-for-client-side">What are the best garbage collection settings for client side?</a> Again very narrow scope</li> <li><a href="https://stackoverflow.com/questions/4505987/does-anyone-know-of-a-good-guide-to-configure-gc-in-java">Does anyone know of a good guide to configure GC in Java?</a> HotSpot only</li> <li><a href="https://stackoverflow.com/questions/2957171/jvm-memory-management-garbage-collection-book">JVM memory management &amp; garbage collection book?</a> is 80% there but I'm missing the checklist/cookbook/for-dummies approach.</li> </ul>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USAaron Digulla
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POIs there a cookbook guide for GC problems?
      1. USMByD
      1. VTFavorite
    2. VO
      singulars
      1. POIs there a cookbook guide for GC problems?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POIs there a cookbook guide for GC problems?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThe GC analyses itself and tunes many of the parameters you can otherwise set. If you want the GC to tune automatically, keep your GC parameters to a minimum. If you have to specify parameters, these are ones which will be specialised to your usecase and are difficult to determine automatically.
      singulars
      1. POIs there a cookbook guide for GC problems?
      1. USPeter Lawrey
    2. COI never made myself a checklist for that, because the first thing to do is: • There _is lots_ incentive to experiment (like run the VM with slightly different settings every day to see how they play out) ;D Very often the simplest soluton is just to adjsut the memory settigngs a bit and done you are.
      singulars
      1. POIs there a cookbook guide for GC problems?
      1. USAngel O'Sphere
    3. CO@Peter: Is there a way to save these parameters as a kind of "starting point" so it doesn't have to go through the chores every time I restart? Or at least look at them?
      singulars
      1. POIs there a cookbook guide for GC problems?
      1. USAaron Digulla
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload