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ASF GitHub Bot logged work on ARTEMIS-3449: ------------------------------------------- Author: ASF GitHub Bot Created on: 31/Aug/21 04:51 Start Date: 31/Aug/21 04:51 Worklog Time Spent: 10m Work Description: franz1981 edited a comment on pull request #3711: URL: https://github.com/apache/activemq-artemis/pull/3711#issuecomment-908895949 I see I didn't state clearly on https://issues.apache.org/jira/browse/ARTEMIS-3449 that the major benefit of this change is not just speeding up file reading, but it reducing the chances of OOM due to lack of native resources too (see [io_util::readBytes](https://github.com/frohoff/jdk8u-jdk/blob/da0da73ab82ed714dc5be94acd2f0d00fbdfe2e9/src/share/native/java/io/io_util.c#L95-L99) for reference). In the original code, byte[] was used to perform read vs `SequentialFile`, using a `RandomAccessFile` under the hood as explained on https://github.com/apache/activemq-artemis/pull/2844#issuecomment-533606931. Sadly, `RandomAccessFile::read` is using platform `malloc/free` (for writing/reading > [8192](https://github.com/frohoff/jdk8u-jdk/blob/da0da73ab82ed714dc5be94acd2f0d00fbdfe2e9/src/share/native/java/io/io_util.c#L58), that's > of the AMQP default max frame size on the broker) under the hood that can massively degrade over time due to fragmentation (if using the default system memory allocator) until been unable to allocate anything, eventually causing broker to hit OOM. With the current approach of this PR we both save this to happen while benefitting from the speedup mentioned in https://github.com/apache/activemq-artemis/pull/2844#issuecomment-533906809 and reported here: ``` Benchmark (chunkSize) (fileName) (fileSize) (ioSize) Mode Cnt Score Error Units ChunkedFileBenchmark.readFullyFile 32768 /tmp/raf.tmp 10485760 32768 avgt 4 2153.527 ± 715.641 us/op ChunkedFileBenchmark.readFullyFileWithNio 32768 /tmp/raf.tmp 10485760 32768 avgt 4 1775.999 ± 831.715 us/op ``` `readFullyFile` is using `byte[]` , while `readFullyFileWithNio` is using direct `ByteBuffer` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: gitbox-unsubscr...@activemq.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org Issue Time Tracking ------------------- Worklog Id: (was: 643861) Time Spent: 4.5h (was: 4h 20m) > Speedup AMQP large message streaming > ------------------------------------ > > Key: ARTEMIS-3449 > URL: https://issues.apache.org/jira/browse/ARTEMIS-3449 > Project: ActiveMQ Artemis > Issue Type: Improvement > Reporter: Francesco Nigro > Assignee: Francesco Nigro > Priority: Major > Time Spent: 4.5h > Remaining Estimate: 0h > > AMQP is using unpooled heap ByteBuffer(s) to stream AMQP large messages: > given that the underline NIO sequential file can both use FileChannel or > RandomAccessFile (depending if the ByteBuffer used is direct/heap based), > both approaches would benefit from using Netty pooled direct buffers and save > additional copies (performed by RandomAccessFile) to happen, reducing GC too. -- This message was sent by Atlassian Jira (v8.3.4#803005)