[GitHub] spark issue #19077: [SPARK-21860][core]Improve memory reuse for heap memory ...
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Github user cloud-fan commented on the issue: https://github.com/apache/spark/pull/19077 LGTM, we can also update L71 `long[] array = new long[(int) ((size + 7) / 8)];`, to use the `alignedSize` --- - To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
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Github user 10110346 commented on the issue: https://github.com/apache/spark/pull/19077 I have updated this PR, just a little bit of improvement, please help review it again,thanks @jiangxb1987 @cloud-fan --- - To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
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Github user cloud-fan commented on the issue: https://github.com/apache/spark/pull/19077 The idea LGTM, but I think we can simplify the implementation to allow the memory allocator to return a larger memory than requested. --- - To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
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Github user jiangxb1987 commented on the issue: https://github.com/apache/spark/pull/19077 ping @cloud-fan shall we continue with this PR? --- - To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
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Github user kiszk commented on the issue: https://github.com/apache/spark/pull/19077 According to [this material](http://s3-eu-west-1.amazonaws.com/presentations2013/10_presentation.pdf#pages=42), `Unsafe.allocateMemory` uses 8-byte boundary. --- - To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
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Github user cloud-fan commented on the issue: https://github.com/apache/spark/pull/19077 What about the unsafe allocation Spark does? Is it also better to use 8-byte boundaries? --- - To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
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Github user kiszk commented on the issue: https://github.com/apache/spark/pull/19077 @cloud-fan IIUC, this PR does not change alignment policy for page allocation. Alignment policy still depends on JVM. This PR changes reuse policy in memory pool. If you are asking about round policy (i.e. 8-byte in this PR) for memory reuse, I do not have strong opinion. 8-byte is also fine. If you are asking about allocation policy, it would be good to use 8-byte boundaries for an allocation as HotSpot and IBM JVMs do. --- - To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
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Github user cloud-fan commented on the issue: https://github.com/apache/spark/pull/19077 shall we always do word alignment for page allocation? cc @kiszk too --- - To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
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Github user 10110346 commented on the issue: https://github.com/apache/spark/pull/19077 @jerryshao @JoshRosen yes, it would not generally be arbitrary sized allocations. Basically, we allocate memory in multiples of 4 or 8 bytesï¼even so, I think this change is also beneficial . Alsoï¼I think this change will not impact on the code which leverage it, because `MemoryBlock` is not changed --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. --- - To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
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Github user JoshRosen commented on the issue: https://github.com/apache/spark/pull/19077 Just curious: do you know where are we allocating these close-in-size chunks of memory? I understand the motivation, but just curious to know what's causing this pattern. I think the original idea here was that most allocations would come from a small set of sizes (usually the page size, or a configurable buffer size) and would not generally be arbitrary sized allocations. --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. --- - To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
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Github user jerryshao commented on the issue: https://github.com/apache/spark/pull/19077 This PR generally looks fine to me, my concern is that will this change bring in subtle impact on the code which leverage it. CC @JoshRosen to take a review. --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. --- - To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
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