Yeah I agree the default is not super good… What you think would be a “sane” default ?
> On 25 Jul 2016, at 19:30, Chris Conroy <[email protected]> wrote: > > Nope: we use fixed size thread pools and are not killing threads. > > I'm not saying that we've gotten that much allocated (we'd OOME well before > then), but the defaults seem to imply that the recycler will hold on to 17G > (per thread?) of memory if you were to allocate that much. This seems wrong. > > I'm running a few experiments changing the recycler max capacity and the > thread local direct buffer size which I think should unblock us. > > On Fri, Jul 22, 2016 at 8:43 AM, 'Norman Maurer' via Netty discussions > <[email protected] <mailto:[email protected]>> wrote: > Hey Chris, > > the thing is that I would not expect to have so much stuff in there as it > should pick things from the Stack per thread. Or do you create and destroy a > lot of threads ? > > >> On 22 Jul 2016, at 00:09, Chris Conroy <[email protected] >> <mailto:[email protected]>> wrote: >> >> I was a bit delayed as I had to roll back for an unrelated reason. >> >> Using “-Dio.netty.threadLocalDirectBufferSize=16” appears to fix the leak. >> >> Can you help me understand how much memory we should expect to sit resident >> in the recycler under the default settings? The documentation is very >> scarce... At first glance, the default of 266k objects in the recycler and >> 64k thread local buffer size limit would consume 17GB of NIO memory? But, >> that can't be right... >> >> https://github.com/netty/netty/issues/3166 >> <https://github.com/netty/netty/issues/3166> and >> https://github.com/netty/netty/issues/4146 >> <https://github.com/netty/netty/issues/4146> seem relevant here. >> >> On Wed, Jul 20, 2016 at 1:54 PM, Chris Conroy <[email protected] >> <mailto:[email protected]>> wrote: >> Sure thing. I'll give that a shot. >> >> On Wed, Jul 20, 2016 at 1:45 PM, 'Norman Maurer' via Netty discussions >> <[email protected] <mailto:[email protected]>> wrote: >> Thanks I will have another look. >> >> One thing you could try is to use >> “-Dio.netty.threadLocalDirectBufferSize=16” and see if the leaks are gone >> then. >> >> This is not a solution but would help me a bit :) >> >> >>> On 20 Jul 2016, at 19:39, Chris Conroy <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> It's no problem! I'm sorry for all the back and forth. I'd just send you >>> the heap dump if I could, but alas it will be difficult to impossible to >>> sanitize it from sensitive data. (As an aside, I really wish there were >>> tools that let you interact with java heap dumps more programmatically...) >>> >>> In the particular heap dump I'm looking at, I have 12,762 such buffers. >>> Interestingly, I see 123k Recycler$DefaultHandles in the heap... >>> <Screen Shot 2016-07-20 at 1.31.40 PM.png> >>> >>> >>> Here's the only path to GC roots from the leaked byte bufs: >>> >>> <Screen Shot 2016-07-20 at 1.34.50 PM.png> >>> >>> The threads appear to all be server worker threads. The Biggest Objects - >>> Dominators view for strong references in YourKit shows me that the server >>> worker threads are the dominant roots in the heap: >>> >>> <Screen Shot 2016-07-20 at 1.38.19 PM.png> >>> >>> >>> >>> >>> >>> On Wed, Jul 20, 2016 at 1:22 PM, 'Norman Maurer' via Netty discussions >>> <[email protected] <mailto:[email protected]>> wrote: >>> And how many of these you have ? >>> >>> Sorry for all the questions :( >>> >>>> On 20 Jul 2016, at 19:19, Chris Conroy <[email protected] >>>> <mailto:[email protected]>> wrote: >>>> >>>> Here's an example leaked buf >>>> >>>> <Screen Shot 2016-07-20 at 1.18.24 PM.png> >>>> >>>> On Wed, Jul 20, 2016 at 1:17 PM, 'Norman Maurer' via Netty discussions >>>> <[email protected] <mailto:[email protected]>> wrote: >>>> One last thing… >>>> >>>> Can you tell me what the capacity() of the “leaked” buffer is ? >>>> >>>>> On 20 Jul 2016, at 19:11, Norman Maurer <[email protected] >>>>> <mailto:[email protected]>> wrote: >>>>> >>>>> Thanks Chris, >>>>> >>>>> this sounds really “fishy”. Let me try to debug this a bit more (not sure >>>>> yet how tho). >>>>> >>>>>> On 20 Jul 2016, at 19:06, Chris Conroy <[email protected] >>>>>> <mailto:[email protected]>> wrote: >>>>>> >>>>>> This leak resulted in exhaustion of 4G of NIO memory. The same >>>>>> application under Netty 3 only ever uses <200MB of NIO memory. I have >>>>>> run several experiments where I take some traffic, disable the node from >>>>>> serving traffic, and then force a full GC. The allocated NIO memory does >>>>>> not return to normal levels. >>>>>> >>>>>> Spot checking the byte buf handles from my heap dump, I see lots (all?) >>>>>> `recycle` and `lastRecycleIds` of `int -2147483648 <tel:2147483648> = >>>>>> 0x80000000` >>>>>> >>>>>> The experiment yesterday with the recycler disabled did not result in >>>>>> any such leaks over several hours of traffic. >>>>>> >>>>>> On Wed, Jul 20, 2016 at 12:41 AM, 'Norman Maurer' via Netty discussions >>>>>> <[email protected] <mailto:[email protected]>> wrote: >>>>>> Are you actually sure these are really leaked ? >>>>>> >>>>>> The point of the “ThreadLocalUnsafeDirectByteBuf” is that it can be >>>>>> reused so it is expected that it not gets released after its written but >>>>>> put back in the recycler. Or you saying there are too many of these ? >>>>>> >>>>>> >>>>>>> On 19 Jul 2016, at 22:39, Chris Conroy <[email protected] >>>>>>> <mailto:[email protected]>> wrote: >>>>>>> >>>>>>> Yes all the leaked buffers look to be ThreadLocalUnsafeDirectByteBuf >>>>>>> >>>>>>> Disabling the recycler w/o backpressure on slow readers resulted in >>>>>>> several massive allocation events. I was able to free them by forcing >>>>>>> GC so no leaks there. Memory usage with backpressure on slow readers is >>>>>>> back down to Netty 3 w/o backpressure levels. I don't see any leaks so >>>>>>> far. >>>>>>> >>>>>>> Assuming that disabling the recycler does indeed prevent leaks, where >>>>>>> do we go from there? Any ideas of things to look for in my application >>>>>>> that might cause the recycler to get into a bad state? >>>>>>> >>>>>>> On Tue, Jul 19, 2016 at 3:40 PM, 'Norman Maurer' via Netty discussions >>>>>>> <[email protected] <mailto:[email protected]>> wrote: >>>>>>> Btw all the “leaking” buffers are always: >>>>>>> >>>>>>> ThreadLocalUnsafeDirectByteBuf >>>>>>> >>>>>>> ? >>>>>>> >>>>>>> >>>>>>>> On 19 Jul 2016, at 21:29, Chris Conroy <[email protected] >>>>>>>> <mailto:[email protected]>> wrote: >>>>>>>> >>>>>>>> I ran with paranoid while observing the leak and got no messages from >>>>>>>> the ResourceLeakDetector. >>>>>>>> >>>>>>>> Initial results from recycler maxCapacity of 0 are looking positive >>>>>>>> with respect to the leak. However, I did see a large spike of NIO >>>>>>>> memory allocated (1G) where the Netty 3 version of this app receiving >>>>>>>> similar traffic peaks at about 1/10th that. I'll let this run for a >>>>>>>> while and report back later with the full results. >>>>>>>> >>>>>>>> On Tue, Jul 19, 2016 at 2:59 PM, 'Norman Maurer' via Netty discussions >>>>>>>> <[email protected] <mailto:[email protected]>> wrote: >>>>>>>> Can you do me a favour and run with: >>>>>>>> >>>>>>>> -Dio.netty.recycler.maxCapacity=0 >>>>>>>> >>>>>>>> And let me know if you still see some leaks ? >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>>> On 19 Jul 2016, at 20:50, Chris Conroy <[email protected] >>>>>>>>> <mailto:[email protected]>> wrote: >>>>>>>>> >>>>>>>>> 4.1.0.Final >>>>>>>>> >>>>>>>>> On Tue, Jul 19, 2016 at 2:48 PM, 'Norman Maurer' via Netty >>>>>>>>> discussions <[email protected] <mailto:[email protected]>> >>>>>>>>> wrote: >>>>>>>>> Are you using 4.0 or 4.1 ? >>>>>>>>> >>>>>>>>>> On 19 Jul 2016, at 20:42, Chris Conroy <[email protected] >>>>>>>>>> <mailto:[email protected]>> wrote: >>>>>>>>>> >>>>>>>>>> I have not been able to reproduce locally yet, but I do see it in a >>>>>>>>>> cluster that takes a lot of varied traffic. The leak detector has >>>>>>>>>> not fired for this under advanced. I will give paranoid a shot to be >>>>>>>>>> safe, but it's my understanding that the leak detection framework is >>>>>>>>>> more for dealing with pooled byte buf misuse, but in this case I am >>>>>>>>>> exclusively using unpooled heap byte bufs: these are just the socket >>>>>>>>>> direct byte bufs that appear to be leaking. >>>>>>>>>> >>>>>>>>>> I meant to add this earlier: The path to GC root goes: >>>>>>>>>> >>>>>>>>>> io.netty.buffer.ByteBufUtil$ThreadLocalUnsafeDirectByteBuf >>>>>>>>>> io.netty.util.Recycler$DefaultHandle >>>>>>>>>> io.netty.util.Recycler$DefaultHandle[] >>>>>>>>>> io.netty.util.Recycler#Stack >>>>>>>>>> java.lang.Object[] >>>>>>>>>> io.netty.util.internal.InternalThreadLocalMap >>>>>>>>>> ... (more thread local map refs up to java.lang.Thread) >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On Tuesday, July 19, 2016 at 2:17:25 PM UTC-4, Norman Maurer wrote: >>>>>>>>>> Can you provide a reproducer? Also did you try to run with paranoid >>>>>>>>>> leak detection >>>>>>>>>> >>>>>>>>>> Am 19.07.2016 um 20:04 schrieb Chris Conroy <[email protected] <>>: >>>>>>>>>> >>>>>>>>>>> Ah okay: I didn't see the calls to failFlushed since they occur >>>>>>>>>>> above the stanza I found suspicious. >>>>>>>>>>> >>>>>>>>>>> So, the above explanation is probably not correct. Still, I am >>>>>>>>>>> seeing a leak where DirectByteBufs are rooted to the recycler, and >>>>>>>>>>> the speed at which these buffers leak appears to be correlated with >>>>>>>>>>> slow/partial readers. >>>>>>>>>>> >>>>>>>>>>> On Monday, July 18, 2016 at 4:36:31 PM UTC-4, Norman Maurer wrote: >>>>>>>>>>> failFlushed(...) should be called to fail and release all flushed >>>>>>>>>>> messages. >>>>>>>>>>> >>>>>>>>>>> Are you saying this not happens? >>>>>>>>>>> >>>>>>>>>>> Am 18.07.2016 um 22:02 schrieb Chris Conroy <[email protected] >>>>>>>>>>> <>>: >>>>>>>>>>> >>>>>>>>>>>> I’ve been trying to track down a NIO memory leak that occurs in a >>>>>>>>>>>> Netty application I am porting from Netty 3 to Netty 4. This leak >>>>>>>>>>>> does not occur in the Netty 3 version of the application. >>>>>>>>>>>> >>>>>>>>>>>> For now, I’m using only unpooled heap buffers in Netty 4, but NIO >>>>>>>>>>>> buffers do come into play for socket communication. >>>>>>>>>>>> >>>>>>>>>>>> I’ve captured a few heap dumps from affected instances, and in >>>>>>>>>>>> each it appears that the leaked DirectByteBuf java objects are >>>>>>>>>>>> rooted in an io.netty.util.Recycler. >>>>>>>>>>>> >>>>>>>>>>>> These buffers remain indefinitely: I can disable the application >>>>>>>>>>>> to drain traffic and force GCs, but the # of NIO buffers and NIO >>>>>>>>>>>> allocated space stays flat. >>>>>>>>>>>> >>>>>>>>>>>> The issue is likely related to slow readers. However, the leak >>>>>>>>>>>> persists long after all channels have been closed. >>>>>>>>>>>> >>>>>>>>>>>> I implemented a writability listener and the leak does appear to >>>>>>>>>>>> go away if I stop writing to a channel after it goes unwritable. >>>>>>>>>>>> This is good, but I’m still worried that this just makes the >>>>>>>>>>>> problem less likely since it’s still possible to write/flush and >>>>>>>>>>>> have pending data: writability just limits how much data will be >>>>>>>>>>>> buffered. >>>>>>>>>>>> >>>>>>>>>>>> Digging into ChannelOutBoundBuffer I see the following stanza in >>>>>>>>>>>> close: >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> // Release all unflushed messages. >>>>>>>>>>>> try { >>>>>>>>>>>> Entry e = unflushedEntry; >>>>>>>>>>>> while (e != null) { >>>>>>>>>>>> // Just decrease; do not trigger any events via >>>>>>>>>>>> decrementPendingOutboundBytes() >>>>>>>>>>>> int size = e.pendingSize; >>>>>>>>>>>> TOTAL_PENDING_SIZE_UPDATER.addAndGet(this, -size); >>>>>>>>>>>> >>>>>>>>>>>> if (!e.cancelled) { >>>>>>>>>>>> ReferenceCountUtil.safeRelease(e.msg); >>>>>>>>>>>> safeFail(e.promise, cause); >>>>>>>>>>>> } >>>>>>>>>>>> e = e.recycleAndGetNext(); >>>>>>>>>>>> } >>>>>>>>>>>> } finally { >>>>>>>>>>>> inFail = false; >>>>>>>>>>>> } >>>>>>>>>>>> clearNioBuffers(); >>>>>>>>>>>> This seems a bit curious to me: why are flushed buffers not >>>>>>>>>>>> released here? Since the leak seems to be rooted in the Recycler, >>>>>>>>>>>> this could be the culprit…What do you think? >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> -- >>>>>>>>>>>> You received this message because you are subscribed to the Google >>>>>>>>>>>> Groups "Netty discussions" group. >>>>>>>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>>>>>>> send an email to [email protected] <>. >>>>>>>>>>>> To view this discussion on the web visit >>>>>>>>>>>> https://groups.google.com/d/msgid/netty/CA%2B%3DgZKADssKFcs-WCc8%2Br2RWrvbgg3csaJPdcsXL_mCD5yG2bg%40mail.gmail.com >>>>>>>>>>>> >>>>>>>>>>>> <https://groups.google.com/d/msgid/netty/CA%2B%3DgZKADssKFcs-WCc8%2Br2RWrvbgg3csaJPdcsXL_mCD5yG2bg%40mail.gmail.com?utm_medium=email&utm_source=footer>. >>>>>>>>>>>> For more options, visit https://groups.google.com/d/optout >>>>>>>>>>>> <https://groups.google.com/d/optout>. >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> -- >>>>>>>>>>> You received this message because you are subscribed to 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