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Add alternative opt for JVM unified logging framework and update regionsize_vs_objectsize #5
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melvin15may
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Apr 21, 2020
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| fit2mb=`grep "source: concurrent humongous allocation" ${log} | sed 's/.*allocation request: \([0-9]*\).*/\1/' | awk '{if($1<1048576) print}' | wc -l` | ||
| fit4mb=`grep "source: concurrent humongous allocation" ${log} | sed 's/.*allocation request: \([0-9]*\).*/\1/' | awk '{if($1<2097152) print}' | wc -l` | ||
| fit8mb=`grep "source: concurrent humongous allocation" ${log} | sed 's/.*allocation request: \([0-9]*\).*/\1/' | awk '{if($1<4194304) print}' | wc -l` | ||
| fit16mb=`grep "source: concurrent humongous allocation" ${log} | sed 's/.*allocation request: \([0-9]*\).*/\1/' | awk '{if($1<8388608) print}' | wc -l` | ||
| fit32mb=`grep "source: concurrent humongous allocation" ${log} | sed 's/.*allocation request: \([0-9]*\).*/\1/' | awk '{if($1<16777216) print}' | wc -l` |
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There is slight difference between log lines of legacy GC options and jvm unified logging event
Legacy
0.106: [G1Ergonomics (Concurrent Cycles) request concurrent cycle initiation, reason: occupancy higher than threshold, occupancy: 60817408 bytes, allocation request: 1048592 bytes, threshold: 60397965 bytes (45.00 %), source: concurrent humongous allocation]
Unified Framework
[334133.389s][debug][gc,ergo,ihop ] Request concurrent cycle initiation (occupancy higher than threshold) occupancy: 390070272B allocation request: 524304B threshold: 350322636B (32.63) source: concurrent humongous allocation
melvin15may
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mjball
reviewed
Sep 2, 2020
| -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCApplicationStoppedTime -XX:+PrintAdaptiveSizePolicy | ||
| ``` | ||
| _For JVM Unified Logging Framework, corresponding options can be found [here](https://docs.oracle.com/javase/9/tools/java.htm#JSWOR-GUID-9569449C-525F-4474-972C-4C1F63D5C357). | ||
| For example, for legacy GC flag `-XX:PrintAdaptiveSizePolicy` (used to add log lines to calculate humongous objects with `regionsize_vs_objectsize.sh`) instead use `-Xlog:ergo*=debug`._ |
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-XX:PrintAdaptiveSizePolicy is missing a +: -XX:+PrintAdaptiveSizePolicy
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regionsize_vs_objectsize.shfor jvm logging framework