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This commit is contained in:
Clinton Gormley 2016-04-13 10:14:09 +02:00
parent 1a15e55f94
commit bdf62b5615
1 changed files with 8 additions and 6 deletions
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14
docs/reference/setup/sysconfig/heap_size.asciidoc
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@ -26,21 +26,23 @@ your server. Good rules of thumb are:
object pointers (compressed oops); the exact cutoff varies but is object pointers (compressed oops); the exact cutoff varies but is
near 32 GB. You can verify that you are under the limit by looking near 32 GB. You can verify that you are under the limit by looking
for a line in the logs like the following: for a line in the logs like the following:
+
heap size [1.9gb], compressed ordinary object pointers [true] heap size [1.9gb], compressed ordinary object pointers [true]
* Even better, try to stay below the threshold for zero-based * Even better, try to stay below the threshold for zero-based
compressed oops; the exact cutoff varies but 26 GB is safe on most compressed oops; the exact cutoff varies but 26 GB is safe on most
systems, but can be as large as 30 GB on some system. You can verify systems, but can be as large as 30 GB on some systems. You can verify
that you are under the limit by starting Elasticsearch with the JVM that you are under the limit by starting Elasticsearch with the JVM
options "-XX:+UnlockDiagnosticVMOptions -XX:+PrintCompressedOopsMode" options `-XX:+UnlockDiagnosticVMOptions -XX:+PrintCompressedOopsMode`
and looking for a line like the following: and looking for a line like the following:
+
--
heap address: 0x000000011be00000, size: 27648 MB, zero based Compressed Oops heap address: 0x000000011be00000, size: 27648 MB, zero based Compressed Oops
showing that zero-based compressed oops are enabled instead of showing that zero-based compressed oops are enabled instead of
heap address: 0x0000000118400000, size: 28672 MB, Compressed Oops with base: 0x00000001183ff000 heap address: 0x0000000118400000, size: 28672 MB, Compressed Oops with base: 0x00000001183ff000
--
Here are examples of how to set the heap size via the jvm.options file: Here are examples of how to set the heap size via the jvm.options file:
@ -62,4 +64,4 @@ ES_JAVA_OPTS="-Xms2g -Xmx2g" ./bin/elasticsearch <1>
ES_JAVA_OPTS="-Xmx4000mb -Xmx4000mb" ./bin/elasticsearch <2> ES_JAVA_OPTS="-Xmx4000mb -Xmx4000mb" ./bin/elasticsearch <2>
------------------ ------------------
<1> Set the minimum and maximum heap size to 2 GB. <1> Set the minimum and maximum heap size to 2 GB.
<1> Set the minimum and maximum heap size to 4000 MB. <2> Set the minimum and maximum heap size to 4000 MB.