HP UX 커널 파라미터 질문

[파로스]

HP 장비에서 특정 파일 크기가 커지면 map failed error가 발생하는데

HP 커널 파라미터 설정 값중에  map 크기 관련 설정하는 부분이 있는지 궁금합니다.

리눅스 같은경우는 max_map_count 값으로 프로로세스가 사용할 수 있는 메모리 맵 영역의

최대 수를 지정할수 있는 옵션이 존재하던데 HP에도 비슷한게 있으면 알려주세요

[ranganath ramachandra]

(Google says you said this):

hp ux kernel parameters Question
A larger file size specified in the hp devices to map failed error occurs,
During hp kernel parameter settings wondering if there's any map size -related settings.
If you like the Linux memory map areas that can be used as a professional process value max_map_count
This option specifies the maximum number that can exist Please let me know if I heard something similar to hp

What is the value of errno when mmap fails?

[파로스]

error log

FSReadError in /Data/cassandra_data/cass_oth/data/ks_java_operation_v2/OPERATION/ks_java_operation_v2-OPERATION-ic-21-Data.db
	at org.apache.cassandra.io.util.MmappedSegmentedFile$Builder.createSegments(MmappedSegmentedFile.java:200)
	at org.apache.cassandra.io.util.MmappedSegmentedFile$Builder.complete(MmappedSegmentedFile.java:168)
	at org.apache.cassandra.io.sstable.SSTableReader.load(SSTableReader.java:418)
	at org.apache.cassandra.io.sstable.SSTableReader.open(SSTableReader.java:209)
	at org.apache.cassandra.io.sstable.SSTableReader.open(SSTableReader.java:157)
	at org.apache.cassandra.io.sstable.SSTableReader$1.run(SSTableReader.java:273)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: Map failed
	at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:922)
	at org.apache.cassandra.io.util.MmappedSegmentedFile$Builder.createSegments(MmappedSegmentedFile.java:192)
	... 10 more
Caused by: java.lang.OutOfMemoryError: Map failed
	at sun.nio.ch.FileChannelImpl.map0(Native Method)
	at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:919)
	... 11 more

 파일크기가 2GB 이상이면 발생하는 에러이며 해당 에러는 hp 장비에서만 발생 합니다.

[Dennis Handly]

> Caused by: java.lang.OutOfMemoryError: Map failed

Not much info, especially since they don't mention mmap(2).

Is this 32 or 64 bit?  What is the value of maxdsiz and maxdsiz_64bit?

How about shmmax(5)?

[파로스]

장비는 64bit 장비이며 커널 설정값은 다음과 같습니다.

Tunable                        Value                    Expression         Changes

maxdsiz                       2147483648        2147483648        Immed

maxdsiz_64bit             4294967296         Default              Immed

shmmax                       2147483648        2147483648       Immed

[Dennis Handly]

You probably need to increase both maxdsiz_64bit & shmmax.