![]() The 'Queue' rules (Options->Queue) have settings to control how many overall active torrents you can have along with various scheduling options. Generally the fewer active (downloading/seeding) torrents you have running at a given time within BiglyBT, the less the CPU usage. To change the JVM heap memory make sure that your 'mode' is set to advanced (Options->Mode) and then go to Options->Startup & Closedown and set the 'Max heap memory' to (say) 120MB and restart. If you make the heap too small then the JVM will spend a lot of time garbage collecting to make space. If the current number of torrents running within BiglyBT is similar to your normal usage, and you want to save some memory, you can probably change the JVM heap limit from the default 250MB to something lower, perhaps 120MB (giving the JVM some room for garbage). Thread state: elapsed=10000,cpu=2947,max=GMReceiver(1825/18%),mem:max=7431168,tot=326112,free=254955Īfter this major memory clean up the total (326MB) has been reduced (memory handed back to the OS) and the free has significantly increased (255MB) meaning that actually only 71MB is in use. You can see the result in the next line logged to the current file. This is will cause the garbage collector to stop everything and free as much memory as possible. A 'full GC' can be triggered by going to the Debug menu in BiglyBT and selecting 'Run GC'. If the free memory gets too low then the allocated memory will be increased.Īs mentioned earlier, the garbage collector has various levels of aggression. If you look at subsequent lines you will probably see that the amount free drops until a garbage collection cycle occurs at which time it'll jump back up again. ![]() The memory figures are given in KB, so this line roughly says that the maximum configured JVM heap is around 7.4GB, the total currently allocated from within that maximum is 346MB and there is 115MB (of the 346MB allocated) that is free (in other words 231MB is in use) Since version 2303 there has been a simpler way to view recent memory usage, go to Tools->Options->Startup & Shutdown and hit the button labeled 'JVM memory usage history' A line is written to the current file every 10 seconds detailing the most active thread along with the current memory usage. If you want to understand what memory is actually required then join the beta program (see the Help menu) and then observe the contents of the two log files 'thread_1.log' and 'thread_2.log' (usage is rotated) in the "logs" folder in the BiglyBT configuration folder. This means that often the JVM will use a significant amount of this due to lax garbage collection. ![]() Garbage collection takes time and effort so if the JVM has plenty of free heap memory it is somewhat lazy and allows the garbage to build up.īiglyBT sets the JVM memory limit to around 250MB to cater for a wide range of usage scenarios. Periodically the JVM runs 'garbage collection' cycles of varying degrees of aggressiveness, searching for and freeing objects that are no longer needed. The JVM is configured with a maximum amount of memory that it is allowed to use when allocating objects, the 'heap'. BiglyBT runs within the Java garbage collected virtual machine (JVM). ![]()
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