Java function/method memory management
I have some questions about Jvm memory management:
1) if two methods or functions are running in background continuously, is it possible to find out that which one is taking more memory?
2) if this is possible then can we do this using Java Reflection ?
java jvm
asked Nov 16 '18 at 5:55
CoderCoder
1
add a comment |
I have some questions about Jvm memory management:
1) if two methods or functions are running in background continuously, is it possible to find out that which one is taking more memory?
2) if this is possible then can we do this using Java Reflection ?
java jvm
asked Nov 16 '18 at 5:55
CoderCoder
1
before/after execution your function put a debug log and in that print the difference of jvm heap memory
– shivam
Nov 16 '18 at 6:30
Please refer this stackoverflow.com/questions/6487802/…
– shivam
Nov 16 '18 at 6:30
add a comment |
I have some questions about Jvm memory management:
1) if two methods or functions are running in background continuously, is it possible to find out that which one is taking more memory?
2) if this is possible then can we do this using Java Reflection ?
java jvm
asked Nov 16 '18 at 5:55
CoderCoder
1
I have some questions about Jvm memory management:
1) if two methods or functions are running in background continuously, is it possible to find out that which one is taking more memory?
2) if this is possible then can we do this using Java Reflection ?
java jvm
java jvm
asked Nov 16 '18 at 5:55
CoderCoder
1
asked Nov 16 '18 at 5:55
CoderCoder
1
edited Nov 16 '18 at 7:40
Coder
asked Nov 16 '18 at 5:55
CoderCoder
1
asked Nov 16 '18 at 5:55
CoderCoder
1
asked Nov 16 '18 at 5:55
CoderCoder
1
1
before/after execution your function put a debug log and in that print the difference of jvm heap memory
– shivam
Nov 16 '18 at 6:30
Please refer this stackoverflow.com/questions/6487802/…
– shivam
Nov 16 '18 at 6:30
add a comment |
before/after execution your function put a debug log and in that print the difference of jvm heap memory
– shivam
Nov 16 '18 at 6:30
Please refer this stackoverflow.com/questions/6487802/…
– shivam
Nov 16 '18 at 6:30
before/after execution your function put a debug log and in that print the difference of jvm heap memory
– shivam
Nov 16 '18 at 6:30
before/after execution your function put a debug log and in that print the difference of jvm heap memory
– shivam
Nov 16 '18 at 6:30
Please refer this stackoverflow.com/questions/6487802/…
– shivam
Nov 16 '18 at 6:30
Please refer this stackoverflow.com/questions/6487802/…
– shivam
Nov 16 '18 at 6:30
add a comment |
1 Answer
1
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I'm not sure what you mean by "taking more memory", but it is definitely possible to find which one allocates more memory. This can be done both from inside the application and from outside.
Inside the application
private static final com.sun.management.ThreadMXBean threadMXBean =
(com.sun.management.ThreadMXBean) ManagementFactory.getThreadMXBean();
public void myAllocatingMethod()
long before = threadMXBean.getThreadAllocatedBytes(Thread.currentThread().getId());
// ... some business logic that allocates memory ...
byte array = new byte[500000];
long after = threadMXBean.getThreadAllocatedBytes(Thread.currentThread().getId());
System.out.println("Method allocated " + (after - before) + " bytes");
Note: this counts memory allocated in the context of current thread. If a method spawns new threads or executes some code in a thread pool, it's not obvious how to account the allocated memory to a particular method.
Outside the application
Use allocation profilers like Java Mission Control.
P.S. Java Reflection has nothing to do with memory measurements.
answered Nov 16 '18 at 11:13
apanginapangin
52.7k8107137
add a comment |
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1 Answer
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1 Answer
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I'm not sure what you mean by "taking more memory", but it is definitely possible to find which one allocates more memory. This can be done both from inside the application and from outside.
Inside the application
private static final com.sun.management.ThreadMXBean threadMXBean =
(com.sun.management.ThreadMXBean) ManagementFactory.getThreadMXBean();
public void myAllocatingMethod()
long before = threadMXBean.getThreadAllocatedBytes(Thread.currentThread().getId());
// ... some business logic that allocates memory ...
byte array = new byte[500000];
long after = threadMXBean.getThreadAllocatedBytes(Thread.currentThread().getId());
System.out.println("Method allocated " + (after - before) + " bytes");
Note: this counts memory allocated in the context of current thread. If a method spawns new threads or executes some code in a thread pool, it's not obvious how to account the allocated memory to a particular method.
Outside the application
Use allocation profilers like Java Mission Control.
P.S. Java Reflection has nothing to do with memory measurements.
answered Nov 16 '18 at 11:13
apanginapangin
52.7k8107137
add a comment |
I'm not sure what you mean by "taking more memory", but it is definitely possible to find which one allocates more memory. This can be done both from inside the application and from outside.
Inside the application
private static final com.sun.management.ThreadMXBean threadMXBean =
(com.sun.management.ThreadMXBean) ManagementFactory.getThreadMXBean();
public void myAllocatingMethod()
long before = threadMXBean.getThreadAllocatedBytes(Thread.currentThread().getId());
// ... some business logic that allocates memory ...
byte array = new byte[500000];
long after = threadMXBean.getThreadAllocatedBytes(Thread.currentThread().getId());
System.out.println("Method allocated " + (after - before) + " bytes");
Note: this counts memory allocated in the context of current thread. If a method spawns new threads or executes some code in a thread pool, it's not obvious how to account the allocated memory to a particular method.
Outside the application
Use allocation profilers like Java Mission Control.
P.S. Java Reflection has nothing to do with memory measurements.
answered Nov 16 '18 at 11:13
apanginapangin
52.7k8107137
add a comment |
I'm not sure what you mean by "taking more memory", but it is definitely possible to find which one allocates more memory. This can be done both from inside the application and from outside.
Inside the application
private static final com.sun.management.ThreadMXBean threadMXBean =
(com.sun.management.ThreadMXBean) ManagementFactory.getThreadMXBean();
public void myAllocatingMethod()
long before = threadMXBean.getThreadAllocatedBytes(Thread.currentThread().getId());
// ... some business logic that allocates memory ...
byte array = new byte[500000];
long after = threadMXBean.getThreadAllocatedBytes(Thread.currentThread().getId());
System.out.println("Method allocated " + (after - before) + " bytes");
Note: this counts memory allocated in the context of current thread. If a method spawns new threads or executes some code in a thread pool, it's not obvious how to account the allocated memory to a particular method.
Outside the application
Use allocation profilers like Java Mission Control.
P.S. Java Reflection has nothing to do with memory measurements.
answered Nov 16 '18 at 11:13
apanginapangin
52.7k8107137
I'm not sure what you mean by "taking more memory", but it is definitely possible to find which one allocates more memory. This can be done both from inside the application and from outside.
Inside the application
private static final com.sun.management.ThreadMXBean threadMXBean =
(com.sun.management.ThreadMXBean) ManagementFactory.getThreadMXBean();
public void myAllocatingMethod()
long before = threadMXBean.getThreadAllocatedBytes(Thread.currentThread().getId());
// ... some business logic that allocates memory ...
byte array = new byte[500000];
long after = threadMXBean.getThreadAllocatedBytes(Thread.currentThread().getId());
System.out.println("Method allocated " + (after - before) + " bytes");
Note: this counts memory allocated in the context of current thread. If a method spawns new threads or executes some code in a thread pool, it's not obvious how to account the allocated memory to a particular method.
Outside the application
Use allocation profilers like Java Mission Control.
P.S. Java Reflection has nothing to do with memory measurements.
answered Nov 16 '18 at 11:13
apanginapangin
52.7k8107137
answered Nov 16 '18 at 11:13
apanginapangin
52.7k8107137
answered Nov 16 '18 at 11:13
apanginapangin
52.7k8107137
answered Nov 16 '18 at 11:13
apanginapangin
52.7k8107137
52.7k8107137
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before/after execution your function put a debug log and in that print the difference of jvm heap memory
– shivam
Nov 16 '18 at 6:30
Please refer this stackoverflow.com/questions/6487802/…
– shivam
Nov 16 '18 at 6:30