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Do I have to implement garbage collection manually in Java?
Is Java “pass-by-reference” or “pass-by-value”?How do I efficiently iterate over each entry in a Java Map?How do I read / convert an InputStream into a String in Java?When to use LinkedList over ArrayList in Java?How do I generate random integers within a specific range in Java?“implements Runnable” vs “extends Thread” in JavaImprove INSERT-per-second performance of SQLite?How do I convert a String to an int in Java?Creating a memory leak with JavaReplacing a 32-bit loop counter with 64-bit introduces crazy performance deviations
I already read some about garbage collection in Java, but I can't find the "best practice" to handle the garbage collection in code. Should I set every variable to null after use, or is it more efficient and performant to just use the default garbage collector? Or do I have to configure the garbage collector through the command line arguments in this case?
Thanks for your advice!
java performance garbage-collection jvm command-line-arguments
asked Mar 8 at 8:13
Marvin KlarMarvin Klar
591321
add a comment |
I already read some about garbage collection in Java, but I can't find the "best practice" to handle the garbage collection in code. Should I set every variable to null after use, or is it more efficient and performant to just use the default garbage collector? Or do I have to configure the garbage collector through the command line arguments in this case?
Thanks for your advice!
java performance garbage-collection jvm command-line-arguments
asked Mar 8 at 8:13
Marvin KlarMarvin Klar
591321
No, you have not
– dehasi
Mar 8 at 8:15
You are not supposed to handle any of that yourself. Java does all of that behind the scenes. You can add calls to the GC in your code specifically, but they'll just be "requests" to run the GC, they don't guarantee that it'll actually run. What you can do, is make sure that when variables become obsolete, you flag them as ready to be garbage collected
– Stultuske
Mar 8 at 8:16
2
Best practice is to let the JVM deal with it. Leave it alone. Mostly. Assigningnullto variables is nearly always unnecessary. Running the GC is nearly always inadvisable; i.e. a bad idea. Tuning the GC is only advisable if you have clear evidence that the GC is behaving badly. (Ill-advised GC tuning may make GC performance worse than leaving it alone.)
– Stephen C
Mar 8 at 8:16
As with all optimizations: Forget it. Avoid stupid algorithms (e.g., bubble sort), use good data structures (there are tons of them in Java itself, more in Guava and other libraries), write clean code with short methods. Especially the GC is meant to work as is, the best practice for 99% cases is leaving it alone as more experienced people have tuned it already.
– maaartinus
Mar 9 at 0:13
add a comment |
I already read some about garbage collection in Java, but I can't find the "best practice" to handle the garbage collection in code. Should I set every variable to null after use, or is it more efficient and performant to just use the default garbage collector? Or do I have to configure the garbage collector through the command line arguments in this case?
Thanks for your advice!
java performance garbage-collection jvm command-line-arguments
asked Mar 8 at 8:13
Marvin KlarMarvin Klar
591321
I already read some about garbage collection in Java, but I can't find the "best practice" to handle the garbage collection in code. Should I set every variable to null after use, or is it more efficient and performant to just use the default garbage collector? Or do I have to configure the garbage collector through the command line arguments in this case?
Thanks for your advice!
java performance garbage-collection jvm command-line-arguments
java performance garbage-collection jvm command-line-arguments
asked Mar 8 at 8:13
Marvin KlarMarvin Klar
591321
asked Mar 8 at 8:13
Marvin KlarMarvin Klar
591321
edited Mar 8 at 8:30
Marvin Klar
asked Mar 8 at 8:13
Marvin KlarMarvin Klar
591321
asked Mar 8 at 8:13
Marvin KlarMarvin Klar
591321
asked Mar 8 at 8:13
Marvin KlarMarvin Klar
591321
591321
No, you have not
– dehasi
Mar 8 at 8:15
You are not supposed to handle any of that yourself. Java does all of that behind the scenes. You can add calls to the GC in your code specifically, but they'll just be "requests" to run the GC, they don't guarantee that it'll actually run. What you can do, is make sure that when variables become obsolete, you flag them as ready to be garbage collected
– Stultuske
Mar 8 at 8:16
2
Best practice is to let the JVM deal with it. Leave it alone. Mostly. Assigningnullto variables is nearly always unnecessary. Running the GC is nearly always inadvisable; i.e. a bad idea. Tuning the GC is only advisable if you have clear evidence that the GC is behaving badly. (Ill-advised GC tuning may make GC performance worse than leaving it alone.)
– Stephen C
Mar 8 at 8:16
As with all optimizations: Forget it. Avoid stupid algorithms (e.g., bubble sort), use good data structures (there are tons of them in Java itself, more in Guava and other libraries), write clean code with short methods. Especially the GC is meant to work as is, the best practice for 99% cases is leaving it alone as more experienced people have tuned it already.
– maaartinus
Mar 9 at 0:13
add a comment |
No, you have not
– dehasi
Mar 8 at 8:15
You are not supposed to handle any of that yourself. Java does all of that behind the scenes. You can add calls to the GC in your code specifically, but they'll just be "requests" to run the GC, they don't guarantee that it'll actually run. What you can do, is make sure that when variables become obsolete, you flag them as ready to be garbage collected
– Stultuske
Mar 8 at 8:16
2
Best practice is to let the JVM deal with it. Leave it alone. Mostly. Assigningnullto variables is nearly always unnecessary. Running the GC is nearly always inadvisable; i.e. a bad idea. Tuning the GC is only advisable if you have clear evidence that the GC is behaving badly. (Ill-advised GC tuning may make GC performance worse than leaving it alone.)
– Stephen C
Mar 8 at 8:16
As with all optimizations: Forget it. Avoid stupid algorithms (e.g., bubble sort), use good data structures (there are tons of them in Java itself, more in Guava and other libraries), write clean code with short methods. Especially the GC is meant to work as is, the best practice for 99% cases is leaving it alone as more experienced people have tuned it already.
– maaartinus
Mar 9 at 0:13
No, you have not
– dehasi
Mar 8 at 8:15
No, you have not
– dehasi
Mar 8 at 8:15
You are not supposed to handle any of that yourself. Java does all of that behind the scenes. You can add calls to the GC in your code specifically, but they'll just be "requests" to run the GC, they don't guarantee that it'll actually run. What you can do, is make sure that when variables become obsolete, you flag them as ready to be garbage collected
– Stultuske
Mar 8 at 8:16
You are not supposed to handle any of that yourself. Java does all of that behind the scenes. You can add calls to the GC in your code specifically, but they'll just be "requests" to run the GC, they don't guarantee that it'll actually run. What you can do, is make sure that when variables become obsolete, you flag them as ready to be garbage collected
– Stultuske
Mar 8 at 8:16
2
2
Best practice is to let the JVM deal with it. Leave it alone. Mostly. Assigning
null to variables is nearly always unnecessary. Running the GC is nearly always inadvisable; i.e. a bad idea. Tuning the GC is only advisable if you have clear evidence that the GC is behaving badly. (Ill-advised GC tuning may make GC performance worse than leaving it alone.)– Stephen C
Mar 8 at 8:16
Best practice is to let the JVM deal with it. Leave it alone. Mostly. Assigning
null to variables is nearly always unnecessary. Running the GC is nearly always inadvisable; i.e. a bad idea. Tuning the GC is only advisable if you have clear evidence that the GC is behaving badly. (Ill-advised GC tuning may make GC performance worse than leaving it alone.)– Stephen C
Mar 8 at 8:16
As with all optimizations: Forget it. Avoid stupid algorithms (e.g., bubble sort), use good data structures (there are tons of them in Java itself, more in Guava and other libraries), write clean code with short methods. Especially the GC is meant to work as is, the best practice for 99% cases is leaving it alone as more experienced people have tuned it already.
– maaartinus
Mar 9 at 0:13
As with all optimizations: Forget it. Avoid stupid algorithms (e.g., bubble sort), use good data structures (there are tons of them in Java itself, more in Guava and other libraries), write clean code with short methods. Especially the GC is meant to work as is, the best practice for 99% cases is leaving it alone as more experienced people have tuned it already.
– maaartinus
Mar 9 at 0:13
add a comment |
2 Answers
2
active
oldest
votes
No, JVM does it for you. That's why it's a language with automatic memory management. If you want, because of performance issues, you can call:
Runtime r = Runtime.getRuntime();
r.gc();
but there is no guarantee, that garbage collector will remove non-referenced objects. It's rather a suggestion for JVM. Only if you know what you're doing. At your own risk.
What you can do is choose an implementation of garbage collector, that suits your needs. For example if you don't want to reclaim any memory, for testing purposes, you can choose epsilon by adding XX:+UseEpsilonGC flag.
answered Mar 8 at 8:17
AndronicusAndronicus
5,46421733
Bad advice. Running thegc()by hand is liable to make application performance worse ... 'cos an application doesn't usually have enough info to know when is the right time to run it.
– Stephen C
Mar 8 at 8:24
Agreed, added note, whank you for that point
– Andronicus
Mar 8 at 8:26
add a comment |
The Garbage Collector mostly do the work himself. You dont need to anything. But you can even watch the Garbage Collector clearing the JVM Memory as seen in the picture
Automatic garbage collection is the process of looking at heap memory, identifying which objects are in use and which are not, and deleting the unused objects.
further information:Java Garbage Collection Basics
answered Mar 8 at 8:26
Jonas M.Jonas M.
6010
add a comment |
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2 Answers
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oldest
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2 Answers
2
active
oldest
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active
oldest
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active
oldest
votes
No, JVM does it for you. That's why it's a language with automatic memory management. If you want, because of performance issues, you can call:
Runtime r = Runtime.getRuntime();
r.gc();
but there is no guarantee, that garbage collector will remove non-referenced objects. It's rather a suggestion for JVM. Only if you know what you're doing. At your own risk.
What you can do is choose an implementation of garbage collector, that suits your needs. For example if you don't want to reclaim any memory, for testing purposes, you can choose epsilon by adding XX:+UseEpsilonGC flag.
answered Mar 8 at 8:17
AndronicusAndronicus
5,46421733
Bad advice. Running thegc()by hand is liable to make application performance worse ... 'cos an application doesn't usually have enough info to know when is the right time to run it.
– Stephen C
Mar 8 at 8:24
Agreed, added note, whank you for that point
– Andronicus
Mar 8 at 8:26
add a comment |
No, JVM does it for you. That's why it's a language with automatic memory management. If you want, because of performance issues, you can call:
Runtime r = Runtime.getRuntime();
r.gc();
but there is no guarantee, that garbage collector will remove non-referenced objects. It's rather a suggestion for JVM. Only if you know what you're doing. At your own risk.
What you can do is choose an implementation of garbage collector, that suits your needs. For example if you don't want to reclaim any memory, for testing purposes, you can choose epsilon by adding XX:+UseEpsilonGC flag.
answered Mar 8 at 8:17
AndronicusAndronicus
5,46421733
Bad advice. Running thegc()by hand is liable to make application performance worse ... 'cos an application doesn't usually have enough info to know when is the right time to run it.
– Stephen C
Mar 8 at 8:24
Agreed, added note, whank you for that point
– Andronicus
Mar 8 at 8:26
add a comment |
No, JVM does it for you. That's why it's a language with automatic memory management. If you want, because of performance issues, you can call:
Runtime r = Runtime.getRuntime();
r.gc();
but there is no guarantee, that garbage collector will remove non-referenced objects. It's rather a suggestion for JVM. Only if you know what you're doing. At your own risk.
What you can do is choose an implementation of garbage collector, that suits your needs. For example if you don't want to reclaim any memory, for testing purposes, you can choose epsilon by adding XX:+UseEpsilonGC flag.
answered Mar 8 at 8:17
AndronicusAndronicus
5,46421733
No, JVM does it for you. That's why it's a language with automatic memory management. If you want, because of performance issues, you can call:
Runtime r = Runtime.getRuntime();
r.gc();
but there is no guarantee, that garbage collector will remove non-referenced objects. It's rather a suggestion for JVM. Only if you know what you're doing. At your own risk.
What you can do is choose an implementation of garbage collector, that suits your needs. For example if you don't want to reclaim any memory, for testing purposes, you can choose epsilon by adding XX:+UseEpsilonGC flag.
answered Mar 8 at 8:17
AndronicusAndronicus
5,46421733
edited Mar 8 at 8:26
answered Mar 8 at 8:17
AndronicusAndronicus
5,46421733
answered Mar 8 at 8:17
AndronicusAndronicus
5,46421733
answered Mar 8 at 8:17
AndronicusAndronicus
5,46421733
5,46421733
Bad advice. Running thegc()by hand is liable to make application performance worse ... 'cos an application doesn't usually have enough info to know when is the right time to run it.
– Stephen C
Mar 8 at 8:24
Agreed, added note, whank you for that point
– Andronicus
Mar 8 at 8:26
add a comment |
Bad advice. Running thegc()by hand is liable to make application performance worse ... 'cos an application doesn't usually have enough info to know when is the right time to run it.
– Stephen C
Mar 8 at 8:24
Agreed, added note, whank you for that point
– Andronicus
Mar 8 at 8:26
Bad advice. Running the
gc() by hand is liable to make application performance worse ... 'cos an application doesn't usually have enough info to know when is the right time to run it.– Stephen C
Mar 8 at 8:24
Bad advice. Running the
gc() by hand is liable to make application performance worse ... 'cos an application doesn't usually have enough info to know when is the right time to run it.– Stephen C
Mar 8 at 8:24
Agreed, added note, whank you for that point
– Andronicus
Mar 8 at 8:26
Agreed, added note, whank you for that point
– Andronicus
Mar 8 at 8:26
add a comment |
The Garbage Collector mostly do the work himself. You dont need to anything. But you can even watch the Garbage Collector clearing the JVM Memory as seen in the picture
Automatic garbage collection is the process of looking at heap memory, identifying which objects are in use and which are not, and deleting the unused objects.
further information:Java Garbage Collection Basics
answered Mar 8 at 8:26
Jonas M.Jonas M.
6010
add a comment |
The Garbage Collector mostly do the work himself. You dont need to anything. But you can even watch the Garbage Collector clearing the JVM Memory as seen in the picture
Automatic garbage collection is the process of looking at heap memory, identifying which objects are in use and which are not, and deleting the unused objects.
further information:Java Garbage Collection Basics
answered Mar 8 at 8:26
Jonas M.Jonas M.
6010
add a comment |
The Garbage Collector mostly do the work himself. You dont need to anything. But you can even watch the Garbage Collector clearing the JVM Memory as seen in the picture
Automatic garbage collection is the process of looking at heap memory, identifying which objects are in use and which are not, and deleting the unused objects.
further information:Java Garbage Collection Basics
answered Mar 8 at 8:26
Jonas M.Jonas M.
6010
The Garbage Collector mostly do the work himself. You dont need to anything. But you can even watch the Garbage Collector clearing the JVM Memory as seen in the picture
Automatic garbage collection is the process of looking at heap memory, identifying which objects are in use and which are not, and deleting the unused objects.
further information:Java Garbage Collection Basics
answered Mar 8 at 8:26
Jonas M.Jonas M.
6010
answered Mar 8 at 8:26
Jonas M.Jonas M.
6010
answered Mar 8 at 8:26
Jonas M.Jonas M.
6010
answered Mar 8 at 8:26
Jonas M.Jonas M.
6010
6010
add a comment |
add a comment |
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No, you have not
– dehasi
Mar 8 at 8:15
You are not supposed to handle any of that yourself. Java does all of that behind the scenes. You can add calls to the GC in your code specifically, but they'll just be "requests" to run the GC, they don't guarantee that it'll actually run. What you can do, is make sure that when variables become obsolete, you flag them as ready to be garbage collected
– Stultuske
Mar 8 at 8:16
2
Best practice is to let the JVM deal with it. Leave it alone. Mostly. Assigning
nullto variables is nearly always unnecessary. Running the GC is nearly always inadvisable; i.e. a bad idea. Tuning the GC is only advisable if you have clear evidence that the GC is behaving badly. (Ill-advised GC tuning may make GC performance worse than leaving it alone.)– Stephen C
Mar 8 at 8:16
As with all optimizations: Forget it. Avoid stupid algorithms (e.g., bubble sort), use good data structures (there are tons of them in Java itself, more in Guava and other libraries), write clean code with short methods. Especially the GC is meant to work as is, the best practice for 99% cases is leaving it alone as more experienced people have tuned it already.
– maaartinus
Mar 9 at 0:13