被面how to manage heap in java jvm# Java - 爪哇娇娃
k*m
1 楼
jvm specification 都没讲过怎么manage heap, 我也不是开发jvm，
这从何说起呀
这从何说起呀
g*g
2 楼
You can configure GC parameters on startup. There would also be cases where
you want to hold on reusable objects to reduce GC. That's about it.
【在 k**m 的大作中提到】
: jvm specification 都没讲过怎么manage heap, 我也不是开发jvm，
: 这从何说起呀
you want to hold on reusable objects to reduce GC. That's about it.
【在 k**m 的大作中提到】
: jvm specification 都没讲过怎么manage heap, 我也不是开发jvm，
: 这从何说起呀
c*e
3 楼
是不是这些：
-XX:InitiatingHeapOccupancyPercent=n Percentage of the (entire) heap
occupancy to start a concurrent GC cycle. It is used by GCs that trigger a
concurrent GC cycle based on the occupancy of the entire heap, not just one
of the generations (e.g., G1). A value of 0 denotes 'do constant GC cycles'.
The default value is 45.
-XX:MaxHeapFreeRatio=70 Maximum percentage of heap free after GC to
avoid shrinking.
-XX:MinHeapFreeRatio=40 Minimum percentage of heap free after GC to
avoid expansion.
要不要用jconsole之类的软件来改参数？
where
【在 g*****g 的大作中提到】
: You can configure GC parameters on startup. There would also be cases where
: you want to hold on reusable objects to reduce GC. That's about it.
-XX:InitiatingHeapOccupancyPercent=n Percentage of the (entire) heap
occupancy to start a concurrent GC cycle. It is used by GCs that trigger a
concurrent GC cycle based on the occupancy of the entire heap, not just one
of the generations (e.g., G1). A value of 0 denotes 'do constant GC cycles'.
The default value is 45.
-XX:MaxHeapFreeRatio=70 Maximum percentage of heap free after GC to
avoid shrinking.
-XX:MinHeapFreeRatio=40 Minimum percentage of heap free after GC to
avoid expansion.
要不要用jconsole之类的软件来改参数？
where
【在 g*****g 的大作中提到】
: You can configure GC parameters on startup. There would also be cases where
: you want to hold on reusable objects to reduce GC. That's about it.
w*z
4 楼
jconsole 只能看，改了参数要重启jvm.
one
'.
【在 c*********e 的大作中提到】
: 是不是这些：
: -XX:InitiatingHeapOccupancyPercent=n Percentage of the (entire) heap
: occupancy to start a concurrent GC cycle. It is used by GCs that trigger a
: concurrent GC cycle based on the occupancy of the entire heap, not just one
: of the generations (e.g., G1). A value of 0 denotes 'do constant GC cycles'.
: The default value is 45.
: -XX:MaxHeapFreeRatio=70 Maximum percentage of heap free after GC to
: avoid shrinking.
: -XX:MinHeapFreeRatio=40 Minimum percentage of heap free after GC to
: avoid expansion.
one
'.
【在 c*********e 的大作中提到】
: 是不是这些：
: -XX:InitiatingHeapOccupancyPercent=n Percentage of the (entire) heap
: occupancy to start a concurrent GC cycle. It is used by GCs that trigger a
: concurrent GC cycle based on the occupancy of the entire heap, not just one
: of the generations (e.g., G1). A value of 0 denotes 'do constant GC cycles'.
: The default value is 45.
: -XX:MaxHeapFreeRatio=70 Maximum percentage of heap free after GC to
: avoid shrinking.
: -XX:MinHeapFreeRatio=40 Minimum percentage of heap free after GC to
: avoid expansion.
c*e
5 楼
那只能通过command line来改参数？
【在 w**z 的大作中提到】
: jconsole 只能看，改了参数要重启jvm.
:
: one
: '.
【在 w**z 的大作中提到】
: jconsole 只能看，改了参数要重启jvm.
:
: one
: '.
w*z
6 楼
there are tons of JVM parameters, as far as I know, you will have to
restart JVM for them to take effect.
【在 c*********e 的大作中提到】
: 那只能通过command line来改参数？
restart JVM for them to take effect.
【在 c*********e 的大作中提到】
: 那只能通过command line来改参数？
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